Corrosion resistance

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