Anti-corrosion coating is the process of covering a surface or substrate with another substance to temporarily or continuously protect it from deterioration or degradation due to reaction with the environment or corrosive agents. Some anti-corrosion coatings may not remove, but only slow down corrosion; some coatings, such as paints and varnishes, are not only protective but also decorative.
Anti-corrosion coatings can be applied as a liquid, gas (vapor deposition) or solid. It is one of the protective materials or methods used to eliminate or slow down the corrosion of articles or components, which has a longer service life and reduces maintenance and parts replacement costs.
There are several factors to consider when selecting a suitable anti-corrosion coating, such as:
Corrosion is usually caused by a combination of conditions and the relationship between materials.
The type of corrosion in which the part is most likely to occur (for example, stress corrosion cracking, general corrosion, galvanic corrosion, pitting corrosion, crevice corrosion, or pattern corrosion).
How the part is used.
How long the part will be exposed to the corrosive environment and the strength of the corrosive material.
Environmental conditions to which the part will be exposed (temperature, humidity, location of the part (outdoor, indoor)).
The quality of the surface of the part - is it free from surface porosity and other imperfections, since microscopic pores allow corrosive agents to reach below the surface.
Before making a final selection, users should test to confirm that the selection is indeed the correct one.
