Acid Corrosion Inhibitor

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Definition - What does Acid Corrosion Inhibitor mean?

An acid corrosion inhibitor is an organic fluid mainly designed to inhibit the attack of acids on metal surfaces during processes such as:

  • Acidization
  • Cleaning
  • Descaling
  • De-rusting

The composition of a corrosion inhibitor is uniquely formulated for its intended application. Therefore, it is not necessary that a single inhibitor composition work for all applications.

Corrosionpedia explains Acid Corrosion Inhibitor

Inhibitors work in a two-step process:

    1. The inhibitor diffuses from the bulk solution to the surface of the metal.
    2. The inhibitor develops a protective film (passivation layer, a film which prevents access of the corrosive substance) on the metal surface.

The use of inhibitors is influenced by:

  • Product
  • Nature of application
  • Acid concentration
  • Temperature

One example of an acid corrosion inhibitor that protects various metals and alloys against corrosive attack from organic acids is a mixture of quinoline quaternary ammonium alkyl amine salts, alkyl thioamide, and oxyalkylated phenols in an aqueous alcohol solvent system.

Applications of inhibitors include:

  • Cleaning boilers
  • Economizer descaling
  • Oil well simulations
  • Pickling of acid bath
  • Cleaning of industrial equipment
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