2. How corrosion inhibitors work
There is no single mode of action for corrosion inhibitors. In fact, the mechanism of action of a given compound often depends on the corrosion system (metal + solution) in which it is found. First, we'll set out a few general points about inhibitor behavior, backed up by a few specific examples. Then, we'll take a closer look at the major classes of inhibitors.
Whatever the exact mechanism by which each inhibitor acts under the conditions in which it is placed, there are a number of basic considerations valid for all inhibitors:
Since corrosion is essentially an electrochemical process, the inhibitor can only act at one of the elementary reaction stages (transport of species in solution, formation of surface intermediates, adsorption of species...
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How corrosion inhibitors work