Multiple choice

Which one of the following is a cathodic corrosion inhibitor?

  1. Phosphate

  2. Chromate

  3. Tungstate

  4. Organic amines
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D Correct answer
Explanation

Chemicals, which reduce the rate of corrosion are called corrosion inhibitors. They are of two types: cathodic and anodic. Phosphate, chromate and tungstate protect anode by forming sparingly soluble products, which are adsorbed on the surface of the metal and hence check the corrosion. Cathodic protection is done by organic amines, mercaptans, thiourea and substituted urea. These chemicals retard reduction reaction, taking place at cathode.

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