Chemistry:Anti-corrosion
Anti-corrosion refers to the protection of metal surfaces from corroding in high-risk (corrosive) environments.[1]
When metallic materials are put into corrosive environments, they tend to have chemical reactions with the air and/or water. The effects of corrosion become evident on the surfaces of these materials. For example, after putting a piece of iron into a corrosive atmosphere for an extended period, it starts rusting due to oxygen interaction with water on the surface of the piece of iron.[2]
Metal equipment lacking any preventive (anti-corrosive) measures may become rusted both inside and out, depending upon atmospheric conditions and how much of that equipment is exposed to the air. There are a number of methods for preventing corrosion, especially in marine applications. Anti-corrosion measures are of particular importance in environments where high humidity, mist, and salt are factors.[3]
Protection from corrosion
- Anti-corrosion materials
- Stainless steel
- Electrogalvanized cold-rolled steel (SECC), a type of zinc-plated steel, used as a housing to protect electronic components[4]
- Barrier coatings provide a consistent film that forms a chemically resistant barrier and blocks external factors from causing harm. [5]
- Sacrificial coatings contain certain element (such as aluminum or zinc) which oxidize sacrificially to ensure the protected element remains corrosion free.[6]
- Enclosure design: fully sealed enclosures (at least full IP65) to protect internal electronic components, used in highly salty and damp places
- Painting treatments on the surface: Another way to protect metal housings from corrosion is by using anti-corrosive paint or powder coat on the metallic surface. The function of this coating is to act as a barrier that inhibits contact between chemical compounds or corrosive materials with the metal housing.
- Surface treatments: formation by chemical reaction of a protective layer on the surface, such as nitriding or nitrocarburizing surface treatments. [7]
- Surface plating: deposition of a corrosion-resistant layer, usually nickel or chrome, by various plating processes, such as electro-plating or electroless plating.
References
- ↑ "What is corrosion resistance?". Archived from the original on 2016-03-04. https://web.archive.org/web/20160304112958/http://www.corrosionist.com/what_is_corrosion_resistance.htm. Retrieved 2015-10-15.
- ↑ "Engineering ToolBox". http://www.engineeringtoolbox.com. Retrieved 2015-10-15.
- ↑ "Protective Coatings and Inorganic Anti Corrosion Pigments". http://www.astm.org/DIGITAL_LIBRARY/MNL/PAGES/MNL12208M.htm. Retrieved 2015-10-15.
- ↑ "Electro Galvanized Steel | Rolled Steel Products « Rolled Steel Products". http://www.rolledsteel.com/electro-galvanized-steel/. Retrieved 2015-10-15.
- ↑ "Anti corrosion coatings". https://www.performancecoatings.org/solutions/anti-corrosion-coatings/. Retrieved 2018-06-25.
- ↑ "Corrosion Resistance - DECC Company". http://www.decc.com/corrosion_protection.php. Retrieved 2015-10-15.
- ↑ "Nitriding for Corrosion and Wear Fatigue Resistance" (in en). Corrosionpedia. https://www.corrosionpedia.com/2/1513/prevention/surface-modification/nitriding-for-corrosion-and-wear-fatigue-resistance.
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