Acid Corrosion Inhibitor

Last updated: April 5, 2018

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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