A corrosion inhibitor is a chemical compound that, when added in small concentration, stops or slows down
corrosion of
metals and
alloys.A typical good corrosion inhibitor will give 95% inhibition at concentration of 80
ppm, and 90
t 40 ppm. Some of the mechanisms of its effect are formation of a
passivation layer (a thin film on the surface of the material that stops access of the corrosive substance to the metal), inhibiting either the oxidation or reduction part of the
redox corrosion system (
anodic and
cathodic inhibitors), or
scavenging the dissolved
oxygen.
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