Corrosion resistance
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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 | Subtrates | 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