Difference between revisions of "Corrosion resistance"
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== Description == | == Description == | ||
− | The ability of a metal to resist chemical changes due to oxidation. Corrosion resistance can be increased by coating the metal surface with paint, oxide layers, passive films or controlling its exposure environment. | + | The ability of a metal to resist chemical changes due to oxidation. Corrosion resistance can be increased by coating the metal surface with [[oil]], [[wax]], [[paint]], [[oxide]] layers, passive films, a more noble metal (plating), anti-corrosion treatments, or by controlling its exposure environment. |
Some materials that can be used to inhibit [[corrosion]] include: | Some materials that can be used to inhibit [[corrosion]] include: | ||
Line 9: | Line 9: | ||
* [[Desiccant]]: removes moisture from the air | * [[Desiccant]]: removes moisture from the air | ||
+ | Some anticorrosion treatments include: | ||
+ | {| class="wikitable" | ||
+ | |- | ||
+ | ! For corrosion resistance on metals | ||
+ | ! Process | ||
+ | ! Substrates | ||
+ | ! Advantages | ||
+ | ! Disadvantages | ||
+ | |- | ||
+ | | Anodizing | ||
+ | | Formation of protective oxide layer; immersion in electrolytic solution | ||
+ | | Non-ferrous metals, primarily aluminum | ||
+ | | Long-lasting, chemically stable,, non-toxic, no dangerous by-products | ||
+ | | Unsuitable for ferrous metals; limited options for colors | ||
+ | |- | ||
+ | | Galvanizing | ||
+ | | Immersion of metal in molten zinc bath to produce protective zinc carbonate layer | ||
+ | | Steel, bolts and nuts, air ducts, trash cans | ||
+ | | Highly stable, adheres tightly; zinc coating actively covers scratches, cuts and dents after they occur | ||
+ | | Expensive for large items; color is dull gray | ||
+ | |- | ||
+ | | Electroplating (electrodeposition) | ||
+ | | Deposition of a thin layer of one metal on the surface of another; both metal are placed in electrolytic solution | ||
+ | | Copper, nickel, gold, silver, chrome, zinc tin, jewelry, ornaments; | ||
+ | | Excellent corrosion resistance; often increases in mechanical properties, can produce aesthetic appearance | ||
+ | | Expensive; produces non-uniform coating thicknesses; potentially toxic; solutions contain environmentally harmful chemicals | ||
+ | |- | ||
+ | | Powder Coating | ||
+ | | An electrostatic process to adhere powder-based substance onto a charged metal surface followed by heat curing. | ||
+ | | Metals, household appliances, automobile parts | ||
+ | | Coatings are durable with many color options; no solvents are used thus no VOCs emissions | ||
+ | | Requires spray booths and ovens, difficult to achieve thin coatings | ||
+ | |- | ||
+ | | Paint Coating | ||
+ | | Application of liquid paint; some types of polymers require mixing prior to application | ||
+ | | Almost anything | ||
+ | | Readily accessible; cost effective; wide variety of options | ||
+ | | Some paints contain toxic elements and/or VOCs.; durability is lower than other coatings | ||
+ | |} | ||
== Synonyms and Related Terms == | == Synonyms and Related Terms == | ||
Line 14: | Line 53: | ||
==Resources and Citations== | ==Resources and Citations== | ||
− | + | * Corrosionpedia: [https://www.corrosionpedia.com/definition/286/coating-corrosion Coatinghttps://chansmachining.com/types-of-industrial-coating/] Accessed October 2024 | |
* Theodore J. Reinhart, 'Glossary of Terms', ''Engineered Plastics'', ASM International, 1988 | * Theodore J. Reinhart, 'Glossary of Terms', ''Engineered Plastics'', ASM International, 1988 | ||
− | + | * Wikipedia: [https://en.wikipedia.org/wiki/Corrosion_inhibitor Corrosion inhibitor) Accessed July 2023 | |
[[Category:Materials database]] | [[Category:Materials database]] |
Latest revision as of 08:05, 16 October 2024
Description
The ability of a metal to resist chemical changes due to oxidation. Corrosion resistance can be increased by coating the metal surface with Oil, Wax, Paint, Oxide layers, passive films, a more noble metal (plating), anti-corrosion treatments, or by controlling its exposure environment.
Some materials that can be used to inhibit Corrosion include:
- Vapor phase corrosion inhibitor: provides a corrosion resistant layer on the surface
- Scavenger: removes pollutants and/or moisture and oxygen from the airs
- Desiccant: removes moisture from the air
Some anticorrosion treatments include:
For corrosion resistance on metals | Process | Substrates | Advantages | Disadvantages |
---|---|---|---|---|
Anodizing | Formation of protective oxide layer; immersion in electrolytic solution | Non-ferrous metals, primarily aluminum | Long-lasting, chemically stable,, non-toxic, no dangerous by-products | Unsuitable for ferrous metals; limited options for colors |
Galvanizing | Immersion of metal in molten zinc bath to produce protective zinc carbonate layer | Steel, bolts and nuts, air ducts, trash cans | Highly stable, adheres tightly; zinc coating actively covers scratches, cuts and dents after they occur | Expensive for large items; color is dull gray |
Electroplating (electrodeposition) | Deposition of a thin layer of one metal on the surface of another; both metal are placed in electrolytic solution | Copper, nickel, gold, silver, chrome, zinc tin, jewelry, ornaments; | Excellent corrosion resistance; often increases in mechanical properties, can produce aesthetic appearance | Expensive; produces non-uniform coating thicknesses; potentially toxic; solutions contain environmentally harmful chemicals |
Powder Coating | An electrostatic process to adhere powder-based substance onto a charged metal surface followed by heat curing. | Metals, household appliances, automobile parts | Coatings are durable with many color options; no solvents are used thus no VOCs emissions | Requires spray booths and ovens, difficult to achieve thin coatings |
Paint Coating | Application of liquid paint; some types of polymers require mixing prior to application | Almost anything | Readily accessible; cost effective; wide variety of options | Some paints contain toxic elements and/or VOCs.; durability is lower than other coatings |
Synonyms and Related Terms
Korrosionbestândigkeit (Deut.); résistance à la corrosion (Fr.); corrosion inhibitor
Resources and Citations
- Corrosionpedia: Coatinghttps://chansmachining.com/types-of-industrial-coating/ Accessed October 2024
- Theodore J. Reinhart, 'Glossary of Terms', Engineered Plastics, ASM International, 1988
- Wikipedia: [https://en.wikipedia.org/wiki/Corrosion_inhibitor Corrosion inhibitor) Accessed July 2023