Vapor phase corrosion inhibitor - Revision history

MDerrick at 20:50, 13 July 2023

2023-07-13T20:50:00Z

← Older revision		Revision as of 16:50, 13 July 2023
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	== Description ==		== Description ==

	A volatile substance used to minimize corrosion or tarnishing of metals. Vapor phase corrosion inhibitors (VPI) can volatilize at room temperature to form a thin deposition layer on nearby surfaces. Their ability to minimize corrosion was first discovered in the early 1900s, but not commercially applied until the 1950s when it was used by Shell to protect military equipment. Some VPI compounds are nonreactive and simply provide a barrier layer that minimizes oxidation and tarnishing of metals. Other VPI compounds are basic, such as the amines, and react with acids in the environment. The strongly basic compounds (sodium hexametaphosphate, [[diethylaminoethanol\|diethylaminoethanol]], [[morpholine\|morpholine]], etc.) are used in HVAC and fire suppression systems to minimize pipe corrosion. Some of the less reactive VPI compounds ([[camphor\|camphor]], [[benzotriazole\|benzotriazole]], etc.) have been incorporated in anti-tarnish papers or enclosed in storage/display cases.		A volatile substance used to minimize [[corrosion]] or tarnishing of metals. Vapor phase corrosion inhibitors (VPI) can volatilize at room temperature to form a thin deposition layer on nearby surfaces. Their ability to minimize corrosion was first discovered in the early 1900s, but not commercially applied until the 1950s when it was used by Shell to protect military equipment. Some VPI compounds are nonreactive and simply provide a barrier layer that minimizes oxidation and tarnishing of metals. Other VPI compounds are basic, such as the amines, and react with acids in the environment. The strongly basic compounds (sodium hexametaphosphate, [[diethylaminoethanol\|diethylaminoethanol]], [[morpholine\|morpholine]], etc.) are used in HVAC and fire suppression systems to minimize pipe corrosion. Some of the less reactive VPI compounds ([[camphor\|camphor]], [[benzotriazole\|benzotriazole]], etc.) have been incorporated in anti-tarnish papers or enclosed in storage/display cases.

	== Synonyms and Related Terms ==		== Synonyms and Related Terms ==

MDerrick at 20:49, 13 July 2023

2023-07-13T20:49:13Z

← Older revision		Revision as of 16:49, 13 July 2023
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	== Description ==		== Description ==

	A volatile substance used to minimize corrosion or tarnishing of metals. Vapor phase corrosion inhibitors (VPI) can volatilize at room temperature to form a thin deposition layer on nearby surfaces. Their ability to minimize corrosion was first discovered in the early 1900s, but not commercially applied until the 1950s when it was used by Shell to protect military equipment. Some VPI compounds are nonreactive and simply provide a barrier layer that minimizes oxidation and tarnishing of metals. Other VPI compounds are basic, such as the amines, and react with acids in the environment. The strongly basic compounds (sodium hexametaphosphate, [[diethylaminoethanol\|diethylaminoethanol]], [[morpholine\|morpholine]], etc.) are used in HVAC and fire suppression systems to minimize pipe corrosion. Some of the less reactive VPI compounds (~~[[dicyclohexyl%20amine%20nitrite\|dicyclohexyl amine nitrite]] (VPI 260),~~ [[camphor\|camphor]], [[benzotriazole\|benzotriazole]], etc.) have been incorporated in anti-tarnish papers or enclosed in storage/display cases.		A volatile substance used to minimize corrosion or tarnishing of metals. Vapor phase corrosion inhibitors (VPI) can volatilize at room temperature to form a thin deposition layer on nearby surfaces. Their ability to minimize corrosion was first discovered in the early 1900s, but not commercially applied until the 1950s when it was used by Shell to protect military equipment. Some VPI compounds are nonreactive and simply provide a barrier layer that minimizes oxidation and tarnishing of metals. Other VPI compounds are basic, such as the amines, and react with acids in the environment. The strongly basic compounds (sodium hexametaphosphate, [[diethylaminoethanol\|diethylaminoethanol]], [[morpholine\|morpholine]], etc.) are used in HVAC and fire suppression systems to minimize pipe corrosion. Some of the less reactive VPI compounds ([[camphor\|camphor]], [[benzotriazole\|benzotriazole]], etc.) have been incorporated in anti-tarnish papers or enclosed in storage/display cases.

	== Synonyms and Related Terms ==		== Synonyms and Related Terms ==
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	VPI; vapour phase inhibitor; volatile corrosion inhibitor; anti-corrosive; antioxidant; camphor; guanidine; benzotriazole		VPI; vapour phase inhibitor; volatile corrosion inhibitor; anti-corrosive; antioxidant; camphor; guanidine; benzotriazole

	Products: DICHAN [Cortec] (~~dicyclohexylammonium~~ nitrite); VPI 260 [Shell] ~~(dicyclohexyl amine nitrite)~~		Products: DICHAN [Cortec] ([[dicyclohexyl%20amine%20nitrite\|dicyclohexyl amine nitrite]]) later sold as VPI 260 [Shell] but discontinued due to health concerns

	== Risks ==		== Risks ==

MDerrick at 20:41, 13 July 2023

2023-07-13T20:41:03Z

← Older revision		Revision as of 16:41, 13 July 2023
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	== Description ==		== Description ==

	A volatile substance used to minimize corrosion or tarnishing of metals. Vapor phase corrosion inhibitors (VPI) can volatilize at room temperature to form a thin deposition layer on nearby surfaces. Their ability to minimize corrosion was first discovered in the early 1900s, but not commercially applied until the 1950s when it was used by Shell to protect military equipment. Some VPI compounds are nonreactive and simply provide a barrier layer that minimizes oxidation and tarnishing of metals. Other VPI compounds are basic, such as the amines, and react with acids in the environment. The strongly basic compounds (sodium hexametaphosphate, [[diethylaminoethanol\|diethylaminoethanol]], [[morpholine\|morpholine]], etc.) are used in HVAC and fire suppression systems to minimize pipe corrosion. Some of the less reactive VPI compounds ([[dicyclohexyl%20amine%20nitrite\|dicyclohexyl amine nitrite]] (VPI 260), [[camphor\|camphor]], [[benzotriazole\|benzotriazole]], etc.) have been incorporated in ~~antitarnish~~ papers or enclosed in storage/display cases.		A volatile substance used to minimize corrosion or tarnishing of metals. Vapor phase corrosion inhibitors (VPI) can volatilize at room temperature to form a thin deposition layer on nearby surfaces. Their ability to minimize corrosion was first discovered in the early 1900s, but not commercially applied until the 1950s when it was used by Shell to protect military equipment. Some VPI compounds are nonreactive and simply provide a barrier layer that minimizes oxidation and tarnishing of metals. Other VPI compounds are basic, such as the amines, and react with acids in the environment. The strongly basic compounds (sodium hexametaphosphate, [[diethylaminoethanol\|diethylaminoethanol]], [[morpholine\|morpholine]], etc.) are used in HVAC and fire suppression systems to minimize pipe corrosion. Some of the less reactive VPI compounds ([[dicyclohexyl%20amine%20nitrite\|dicyclohexyl amine nitrite]] (VPI 260), [[camphor\|camphor]], [[benzotriazole\|benzotriazole]], etc.) have been incorporated in anti-tarnish papers or enclosed in storage/display cases.

	== Synonyms and Related Terms ==		== Synonyms and Related Terms ==

	VPI; vapour phase inhibitor; camphor; DICHAN [Cortec] (dicyclohexylammonium nitrite); VPI 260 [Shell] (dicyclohexyl amine nitrite)~~; volatile corrosion inhibitors; guanidine~~		VPI; vapour phase inhibitor; volatile corrosion inhibitor; anti-corrosive; antioxidant; camphor; guanidine; benzotriazole

			Products: DICHAN [Cortec] (dicyclohexylammonium nitrite); VPI 260 [Shell] (dicyclohexyl amine nitrite)

	== Risks ==		== Risks ==
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	* B.A.Miksic, R.H.Miller, 'The Fundamental Principles of Corrosion Protection with Vapor Phase Inhibitors', 5th European Symposium on Corrosion Inhibitors, Italy, 1980 at [http://www.cortecvci.com/Publications/Papers/VCIProducts/CTP-13.pdf Link] (contains tables for vapor pressure and pH of selected compounds)		* B.A.Miksic, R.H.Miller, 'The Fundamental Principles of Corrosion Protection with Vapor Phase Inhibitors', 5th European Symposium on Corrosion Inhibitors, Italy, 1980 at [http://www.cortecvci.com/Publications/Papers/VCIProducts/CTP-13.pdf Link] (contains tables for vapor pressure and pH of selected compounds)
			* Wikipedia: [https://en.wikipedia.org/wiki/Volatile_corrosion_inhibitor Volatile corrosion inhibitor] Accessed July 2023
	* VCI technical information at http://www.vci2000.com/Technical_Info/technical_info.html		* VCI technical information at http://www.vci2000.com/Technical_Info/technical_info.html

	* G.S.Brady, ''Materials Handbook'', McGraw-Hill Book Co., New York, 1971 Comment: p. 67		* G.S.Brady, ''Materials Handbook'', McGraw-Hill Book Co., New York, 1971 Comment: p. 67

	* Marjorie Shelley, ''The Care and Handling of Art Objects'', The Metropolitan Museum, New York, 1987		* Marjorie Shelley, ''The Care and Handling of Art Objects'', The Metropolitan Museum, New York, 1987

	* Pam Hatchfield, ''Pollutants in the Museum Environment'', Archetype Press, London, 2002		* Pam Hatchfield, ''Pollutants in the Museum Environment'', Archetype Press, London, 2002

	* L. Selwyn, 'Historical Silver: Storage, Display and Tarnish Removal', ''J.IIC-GC'', 15, 1990		* L. Selwyn, 'Historical Silver: Storage, Display and Tarnish Removal', ''J.IIC-GC'', 15, 1990

	* Naiemy Tarei Parastoo, Submitted information, May 2005		* Naiemy Tarei Parastoo, Submitted information, May 2005

	* History of Vapor Phase Corrosion Inhibitors at http://www.cases2go.com/html/vcihistory.html (primarily nitrites)		* History of Vapor Phase Corrosion Inhibitors at http://www.cases2go.com/html/vcihistory.html (primarily nitrites)

MDerrick at 19:44, 23 June 2022

2022-06-23T19:44:09Z

← Older revision		Revision as of 15:44, 23 June 2022
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	== Description ==		== Description ==

	A volatile substance used to minimize corrosion or tarnishing of metals. Vapor phase corrosion inhibitors (VPI) can volatilize at room temperature to form a thin deposition layer on nearby surfaces. Their ability to minimize corrosion was first discovered in the early 1900s, but not commercially applied until the 1950s when it was used by Shell to protect military equipment. Some VPI compounds are nonreactive and simply provide a barrier layer that minimizes oxidation and tarnishing of metals. Other VPI compounds are basic, such as the amines, and react with acids in the environment. The strongly basic compounds (~~[[sodium%20hexametaphosphate\|~~sodium hexametaphosphate]], [[diethylaminoethanol\|diethylaminoethanol]], [[morpholine\|morpholine]], etc.) are used in HVAC and fire suppression systems to minimize pipe corrosion. Some of the less reactive VPI compounds ([[dicyclohexyl%20amine%20nitrite\|dicyclohexyl amine nitrite]] (VPI 260), [[camphor\|camphor]], [[benzotriazole\|benzotriazole]], etc.) have been incorporated in antitarnish papers or enclosed in storage/display cases.		A volatile substance used to minimize corrosion or tarnishing of metals. Vapor phase corrosion inhibitors (VPI) can volatilize at room temperature to form a thin deposition layer on nearby surfaces. Their ability to minimize corrosion was first discovered in the early 1900s, but not commercially applied until the 1950s when it was used by Shell to protect military equipment. Some VPI compounds are nonreactive and simply provide a barrier layer that minimizes oxidation and tarnishing of metals. Other VPI compounds are basic, such as the amines, and react with acids in the environment. The strongly basic compounds (sodium hexametaphosphate, [[diethylaminoethanol\|diethylaminoethanol]], [[morpholine\|morpholine]], etc.) are used in HVAC and fire suppression systems to minimize pipe corrosion. Some of the less reactive VPI compounds ([[dicyclohexyl%20amine%20nitrite\|dicyclohexyl amine nitrite]] (VPI 260), [[camphor\|camphor]], [[benzotriazole\|benzotriazole]], etc.) have been incorporated in antitarnish papers or enclosed in storage/display cases.

	== Synonyms and Related Terms ==		== Synonyms and Related Terms ==

MDerrick at 19:42, 23 June 2022

2022-06-23T19:42:57Z

← Older revision		Revision as of 15:42, 23 June 2022
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	VPI; vapour phase inhibitor; camphor; DICHAN [Cortec] (dicyclohexylammonium nitrite); VPI 260 [Shell] (dicyclohexyl amine nitrite); volatile corrosion inhibitors; guanidine		VPI; vapour phase inhibitor; camphor; DICHAN [Cortec] (dicyclohexylammonium nitrite); VPI 260 [Shell] (dicyclohexyl amine nitrite); volatile corrosion inhibitors; guanidine

	== ~~Other Properties~~ ==		== Risks ==

	~~Dicyclohexyl amine nitrite: Vapor pressure = 0~~.~~00013 @ 21C; pH of condensate = 10~~.0		* May produce an oily film on materials.
			* Many are highly alkaline and hygroscopic (Hatchfield 2002).
			* Some VPI materials are suspected carcinogens

	~~Benzotriazole: Vapor pressure~~ = ~~0.04 @ 20C~~		==Physical and Chemical Properties==

	Cyclohexylamine carbonate: Vapor pressure = 0.397 @ 25C		* [[Dicyclohexyl amine nitrite]]: Vapor pressure = 0.00013 @ 21C; pH of condensate = 10.0
			* [[Benzotriazole]]: Vapor pressure = 0.04 @ 20C
			* [[Cyclohexylamine carbonate\|Cyclohexylamine carbonate]]: Vapor pressure = 0.397 @ 25C
			* [[Morpholine]]: Vapor pressure = 8.0 @ 20C

	~~Morpholine: Vapor pressure~~ = ~~8.0 @ 20C~~		==Resources and Citations==

	~~== Hazards~~ and ~~Safety ==~~		* B.A.Miksic, R.H.Miller, 'The Fundamental Principles of Corrosion Protection with Vapor Phase Inhibitors', 5th European Symposium on Corrosion Inhibitors, Italy, 1980 at [http://www.cortecvci.com/Publications/Papers/VCIProducts/CTP-13.pdf Link] (contains tables for vapor pressure and pH of selected compounds)

	~~May produce an oily film on materials. Many are highly alkaline and hygroscopic (Hatchfield 2002). Some VPI materials are suspected carcinogens~~		* VCI technical information at http://www.vci2000.com/Technical_Info/technical_info.html

	~~== Additional Information ==~~

	° P.Hatchfield, ''Pollutants in the Museum Environment'', Archetype Press, London, 2002. ° L.Selwyn, "Historical Silver: Storage, Display and Tarnish Removal," J.IIC-GC, Vol. 15, 1990. ° B.A.Miksic, R.H.Miller, 'The Fundamental Principles of Corrosion Protection with Vapor Phase Inhibitors', 5th European Symposium on Corrosion Inhibitors, Italy, 1980 at [http://www.cortecvci.com/Publications/Papers/VCIProducts/CTP-13.pdf Link] (contains tables for vapor pressure and pH of selected compounds)

	~~== Sources Checked for Data in Record ==~~

	* ~~Website address 2 Comment:~~ VCI technical information at http://www.vci2000.com/Technical_Info/technical_info.html

	* G.S.Brady, ''Materials Handbook'', McGraw-Hill Book Co., New York, 1971 Comment: p. 67		* G.S.Brady, ''Materials Handbook'', McGraw-Hill Book Co., New York, 1971 Comment: p. 67
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	* L. Selwyn, 'Historical Silver: Storage, Display and Tarnish Removal', ''J.IIC-GC'', 15, 1990		* L. Selwyn, 'Historical Silver: Storage, Display and Tarnish Removal', ''J.IIC-GC'', 15, 1990

	* ~~External source or communication Comment: Submitted information from~~ Naiemy Tarei Parastoo, May 2005		* Naiemy Tarei Parastoo, Submitted information, May 2005

	* ~~Website address 1 Comment:~~ History of Vapor Phase Corrosion Inhibitors at http://www.cases2go.com/html/vcihistory.html (primarily nitrites)		* History of Vapor Phase Corrosion Inhibitors at http://www.cases2go.com/html/vcihistory.html (primarily nitrites)



	[[Category:Materials database]]		[[Category:Materials database]]

Jruggiero: Text replace - "\[http:\/\/cameo\.mfa\.org\/materials\/fullrecord\.asp\?name=([^\s]+)\s(.*)\]" to "$2"

2016-05-10T18:03:56Z

Text replace - "\[http:\/\/cameo\.mfa\.org\/materials\/fullrecord\.asp\?name=([^\s]+)\s(.*)\]" to "$2"

← Older revision		Revision as of 14:03, 10 May 2016
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	== Description ==		== Description ==

	A volatile substance used to minimize corrosion or tarnishing of metals. Vapor phase corrosion inhibitors (VPI) can volatilize at room temperature to form a thin deposition layer on nearby surfaces. Their ability to minimize corrosion was first discovered in the early 1900s, but not commercially applied until the 1950s when it was used by Shell to protect military equipment. Some VPI compounds are nonreactive and simply provide a barrier layer that minimizes oxidation and tarnishing of metals. Other VPI compounds are basic, such as the amines, and react with acids in the environment. The strongly basic compounds ([~~http://cameo.mfa.org/materials/fullrecord.asp?name=~~sodium%20hexametaphosphate sodium hexametaphosphate], [~~http://cameo.mfa.org/materials/fullrecord.asp?name=~~diethylaminoethanol diethylaminoethanol], [~~http://cameo.mfa.org/materials/fullrecord.asp?name=~~morpholine morpholine], etc.) are used in HVAC and fire suppression systems to minimize pipe corrosion. Some of the less reactive VPI compounds ([~~http://cameo.mfa.org/materials/fullrecord.asp?name=~~dicyclohexyl%20amine%20nitrite dicyclohexyl amine nitrite] (VPI 260), [~~http://cameo.mfa.org/materials/fullrecord.asp?name=~~camphor camphor], [~~http://cameo.mfa.org/materials/fullrecord.asp?name=~~benzotriazole benzotriazole], etc.) have been incorporated in antitarnish papers or enclosed in storage/display cases.		A volatile substance used to minimize corrosion or tarnishing of metals. Vapor phase corrosion inhibitors (VPI) can volatilize at room temperature to form a thin deposition layer on nearby surfaces. Their ability to minimize corrosion was first discovered in the early 1900s, but not commercially applied until the 1950s when it was used by Shell to protect military equipment. Some VPI compounds are nonreactive and simply provide a barrier layer that minimizes oxidation and tarnishing of metals. Other VPI compounds are basic, such as the amines, and react with acids in the environment. The strongly basic compounds ([[sodium%20hexametaphosphate\|sodium hexametaphosphate]], [[diethylaminoethanol\|diethylaminoethanol]], [[morpholine\|morpholine]], etc.) are used in HVAC and fire suppression systems to minimize pipe corrosion. Some of the less reactive VPI compounds ([[dicyclohexyl%20amine%20nitrite\|dicyclohexyl amine nitrite]] (VPI 260), [[camphor\|camphor]], [[benzotriazole\|benzotriazole]], etc.) have been incorporated in antitarnish papers or enclosed in storage/display cases.

	== Synonyms and Related Terms ==		== Synonyms and Related Terms ==

Jruggiero: Text replace - "== Authority ==" to "== Sources Checked for Data in Record =="

2016-05-02T03:42:21Z

Text replace - "== Authority ==" to "== Sources Checked for Data in Record =="

← Older revision		Revision as of 23:42, 1 May 2016
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	° P.Hatchfield, ''Pollutants in the Museum Environment'', Archetype Press, London, 2002. ° L.Selwyn, "Historical Silver: Storage, Display and Tarnish Removal," J.IIC-GC, Vol. 15, 1990. ° B.A.Miksic, R.H.Miller, 'The Fundamental Principles of Corrosion Protection with Vapor Phase Inhibitors', 5th European Symposium on Corrosion Inhibitors, Italy, 1980 at [http://www.cortecvci.com/Publications/Papers/VCIProducts/CTP-13.pdf Link] (contains tables for vapor pressure and pH of selected compounds)		° P.Hatchfield, ''Pollutants in the Museum Environment'', Archetype Press, London, 2002. ° L.Selwyn, "Historical Silver: Storage, Display and Tarnish Removal," J.IIC-GC, Vol. 15, 1990. ° B.A.Miksic, R.H.Miller, 'The Fundamental Principles of Corrosion Protection with Vapor Phase Inhibitors', 5th European Symposium on Corrosion Inhibitors, Italy, 1980 at [http://www.cortecvci.com/Publications/Papers/VCIProducts/CTP-13.pdf Link] (contains tables for vapor pressure and pH of selected compounds)

	== ~~Authority~~ ==		== Sources Checked for Data in Record ==

	* Website address 2 Comment: VCI technical information at http://www.vci2000.com/Technical_Info/technical_info.html		* Website address 2 Comment: VCI technical information at http://www.vci2000.com/Technical_Info/technical_info.html

Unknown user at 12:34, 24 July 2013

2013-07-24T12:34:51Z

Unknown user at 18:13, 27 April 2013

2013-04-27T18:13:02Z

New page

== Description ==

A volatile substance used to minimize corrosion or tarnishing of metals. Vapor phase corrosion inhibitors (VPI) can volatilize at room temperature to form a thin deposition layer on nearby surfaces. Their ability to minimize corrosion was first discovered in the early 1900s, but not commercially applied until the 1950s when it was used by Shell to protect military equipment. Some VPI compounds are nonreactive and simply provide a barrier layer that minimizes oxidation and tarnishing of metals. Other VPI compounds are basic, such as the amines, and react with acids in the environment. The strongly basic compounds ([http://cameo.mfa.org/materials/fullrecord.asp?name=sodium hexametaphosphate sodium hexametaphosphate], [http://cameo.mfa.org/materials/fullrecord.asp?name=diethylaminoethanol diethylaminoethanol], [http://cameo.mfa.org/materials/fullrecord.asp?name=morpholine morpholine], etc.) are used in HVAC and fire suppression systems to minimize pipe corrosion. Some of the less reactive VPI compounds ([http://cameo.mfa.org/materials/fullrecord.asp?name=dicyclohexyl amine nitrite dicyclohexyl amine nitrite] (VPI 260), [http://cameo.mfa.org/materials/fullrecord.asp?name=camphor camphor], [http://cameo.mfa.org/materials/fullrecord.asp?name=benzotriazole benzotriazole], etc.) have been incorporated in antitarnish papers or enclosed in storage/display cases.

== Synonyms and Related Terms ==

VPI; vapour phase inhibitor; camphor; DICHAN [Cortec] (dicyclohexylammonium nitrite); VPI 260 [Shell] (dicyclohexyl amine nitrite); volatile corrosion inhibitors; guanidine

== Other Properties ==

Dicyclohexyl amine nitrite: Vapor pressure = 0.00013 @ 21C; pH of condensate = 10.0

Benzotriazole: Vapor pressure = 0.04 @ 20C

Cyclohexylamine carbonate: Vapor pressure = 0.397 @ 25C

Morpholine: Vapor pressure = 8.0 @ 20C

== Hazards and Safety ==

May produce an oily film on materials. Many are highly alkaline and hygroscopic (Hatchfield 2002). Some VPI materials are suspected carcinogens

== Additional Information ==

P.Hatchfield, ''Pollutants in the Museum Environment'', Archetype Press, London, 2002. L.Selwyn, "Historical Silver: Storage, Display and Tarnish Removal," J.IIC-GC, Vol. 15, 1990. B.A.Miksic, R.H.Miller, 'The Fundamental Principles of Corrosion Protection with Vapor Phase Inhibitors', 5th European Symposium on Corrosion Inhibitors, Italy, 1980 at [http://www.cortecvci.com/Publications/Papers/VCIProducts/CTP-13.pdf Link] (contains tables for vapor pressure and pH of selected compounds)

== Authority ==

* Website address 2 Comment: VCI technical information at http://www.vci2000.com/Technical_Info/technical_info.html

* G.S.Brady, G.S.Brady, ''Materials Handbook'', McGraw-Hill Book Co., New York, 1971 Comment: p. 67

* Marjorie Shelley, Marjorie Shelley, ''The Care and Handling of Art Objects'', The Metropolitan Museum, New York, 1987

* Pam Hatchfield, Pam Hatchfield, ''Pollutants in the Museum Environment'', Archetype Press, London, 2002

* L. Selwyn, L. Selwyn, 'Historical Silver: Storage, Display and Tarnish Removal', ''J.IIC-GC'', 15, 1990

* External source or communication, External source or communication Comment: Submitted information from Naiemy Tarei Parastoo, May 2005

* Website address 1, Website address 1 Comment: History of Vapor Phase Corrosion Inhibitors at http://www.cases2go.com/html/vcihistory.html (primarily nitrites)

[[Category:Materials database]]

← Older revision		Revision as of 08:34, 24 July 2013
Line 1:		Line 1:
	== Description ==		== Description ==

	A volatile substance used to minimize corrosion or tarnishing of metals. Vapor phase corrosion inhibitors (VPI) can volatilize at room temperature to form a thin deposition layer on nearby surfaces. Their ability to minimize corrosion was first discovered in the early 1900s, but not commercially applied until the 1950s when it was used by Shell to protect military equipment. Some VPI compounds are nonreactive and simply provide a barrier layer that minimizes oxidation and tarnishing of metals. Other VPI compounds are basic, such as the amines, and react with acids in the environment. The strongly basic compounds ([http://cameo.mfa.org/materials/fullrecord.asp?name=sodium ~~hexametaphosphate~~ sodium hexametaphosphate], [http://cameo.mfa.org/materials/fullrecord.asp?name=diethylaminoethanol diethylaminoethanol], [http://cameo.mfa.org/materials/fullrecord.asp?name=morpholine morpholine], etc.) are used in HVAC and fire suppression systems to minimize pipe corrosion. Some of the less reactive VPI compounds ([http://cameo.mfa.org/materials/fullrecord.asp?name=dicyclohexyl ~~amine nitrite~~ dicyclohexyl amine nitrite] (VPI 260), [http://cameo.mfa.org/materials/fullrecord.asp?name=camphor camphor], [http://cameo.mfa.org/materials/fullrecord.asp?name=benzotriazole benzotriazole], etc.) have been incorporated in antitarnish papers or enclosed in storage/display cases.		A volatile substance used to minimize corrosion or tarnishing of metals. Vapor phase corrosion inhibitors (VPI) can volatilize at room temperature to form a thin deposition layer on nearby surfaces. Their ability to minimize corrosion was first discovered in the early 1900s, but not commercially applied until the 1950s when it was used by Shell to protect military equipment. Some VPI compounds are nonreactive and simply provide a barrier layer that minimizes oxidation and tarnishing of metals. Other VPI compounds are basic, such as the amines, and react with acids in the environment. The strongly basic compounds ([http://cameo.mfa.org/materials/fullrecord.asp?name=sodium%20hexametaphosphate sodium hexametaphosphate], [http://cameo.mfa.org/materials/fullrecord.asp?name=diethylaminoethanol diethylaminoethanol], [http://cameo.mfa.org/materials/fullrecord.asp?name=morpholine morpholine], etc.) are used in HVAC and fire suppression systems to minimize pipe corrosion. Some of the less reactive VPI compounds ([http://cameo.mfa.org/materials/fullrecord.asp?name=dicyclohexyl%20amine%20nitrite dicyclohexyl amine nitrite] (VPI 260), [http://cameo.mfa.org/materials/fullrecord.asp?name=camphor camphor], [http://cameo.mfa.org/materials/fullrecord.asp?name=benzotriazole benzotriazole], etc.) have been incorporated in antitarnish papers or enclosed in storage/display cases.

	== Synonyms and Related Terms ==		== Synonyms and Related Terms ==
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	== Additional Information ==		== Additional Information ==

	P.Hatchfield, ''Pollutants in the Museum Environment'', Archetype Press, London, 2002. L.Selwyn, "Historical Silver: Storage, Display and Tarnish Removal," J.IIC-GC, Vol. 15, 1990. B.A.Miksic, R.H.Miller, 'The Fundamental Principles of Corrosion Protection with Vapor Phase Inhibitors', 5th European Symposium on Corrosion Inhibitors, Italy, 1980 at [http://www.cortecvci.com/Publications/Papers/VCIProducts/CTP-13.pdf Link] (contains tables for vapor pressure and pH of selected compounds)		° P.Hatchfield, ''Pollutants in the Museum Environment'', Archetype Press, London, 2002. ° L.Selwyn, "Historical Silver: Storage, Display and Tarnish Removal," J.IIC-GC, Vol. 15, 1990. ° B.A.Miksic, R.H.Miller, 'The Fundamental Principles of Corrosion Protection with Vapor Phase Inhibitors', 5th European Symposium on Corrosion Inhibitors, Italy, 1980 at [http://www.cortecvci.com/Publications/Papers/VCIProducts/CTP-13.pdf Link] (contains tables for vapor pressure and pH of selected compounds)

	== Authority ==		== Authority ==
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	* Website address 2 Comment: VCI technical information at http://www.vci2000.com/Technical_Info/technical_info.html		* Website address 2 Comment: VCI technical information at http://www.vci2000.com/Technical_Info/technical_info.html

	* ~~G.S.Brady,~~ G.S.Brady, ''Materials Handbook'', McGraw-Hill Book Co., New York, 1971 Comment: p. 67		* G.S.Brady, ''Materials Handbook'', McGraw-Hill Book Co., New York, 1971 Comment: p. 67

	* ~~Marjorie Shelley,~~ Marjorie Shelley, ''The Care and Handling of Art Objects'', The Metropolitan Museum, New York, 1987		* Marjorie Shelley, ''The Care and Handling of Art Objects'', The Metropolitan Museum, New York, 1987

	* ~~Pam Hatchfield,~~ Pam Hatchfield, ''Pollutants in the Museum Environment'', Archetype Press, London, 2002		* Pam Hatchfield, ''Pollutants in the Museum Environment'', Archetype Press, London, 2002

	* ~~L. Selwyn,~~ L. Selwyn, 'Historical Silver: Storage, Display and Tarnish Removal', ''J.IIC-GC'', 15, 1990		* L. Selwyn, 'Historical Silver: Storage, Display and Tarnish Removal', ''J.IIC-GC'', 15, 1990

	* ~~External source or communication,~~ External source or communication Comment: Submitted information from Naiemy Tarei Parastoo, May 2005		* External source or communication Comment: Submitted information from Naiemy Tarei Parastoo, May 2005

	* ~~Website address 1,~~ Website address 1 Comment: History of Vapor Phase Corrosion Inhibitors at http://www.cases2go.com/html/vcihistory.html (primarily nitrites)		* Website address 1 Comment: History of Vapor Phase Corrosion Inhibitors at http://www.cases2go.com/html/vcihistory.html (primarily nitrites)



	[[Category:Materials database]]		[[Category:Materials database]]