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
  1. "What is corrosion resistance?". www.corrosionist.com. Archived from the original on 2016-03-04. Retrieved 2015-10-15.
  2. "Engineering ToolBox". www.engineeringtoolbox.com. Retrieved 2015-10-15.
  3. "Protective Coatings and Inorganic Anti Corrosion Pigments". www.astm.org. Retrieved 2015-10-15.
  4. "Electro Galvanized Steel | Rolled Steel Products « Rolled Steel Products". www.rolledsteel.com. Retrieved 2015-10-15.
  5. "Anti corrosion coatings". www.performancecoatings.org. Retrieved 2018-06-25.
  6. "Corrosion Resistance - DECC Company". www.decc.com. Retrieved 2015-10-15.
  7. "Nitriding for Corrosion and Wear Fatigue Resistance". Corrosionpedia. Retrieved 2018-06-19.
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