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Anodic Inhibitor

Last updated: July 22, 2020

What Does Anodic Inhibitor Mean?

Anodic inhibitors are chemical substances that form a protective layer of oxide film on the surface of metal, causing resistance to corrosion. These inhibitors particularly alter the anodic reactions in a chemical cell, forcing the metallic surface into the passivation region.

Anodic inhibitors are also known as passivators.

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Corrosionpedia Explains Anodic Inhibitor

A strong relationship exists between the concentration of anodic inhibitors and corrosion rates.

Anodic corrosion inhibitor mechanisms involve blocking of anodic sites in an electrochemical cell. Blocking of anodic sites depends on concentration of the inhibitor—when present in low concentrations the inhibitor blocks weak anodes first and protective films do not establish fully. As the concentration increases, inhibitors react with the strong anodes, forming a passive layer and leading to reduction in corrosion rates.

Examples of anodic inhibitors include:

  • Chromate
  • Molybdate
  • Nitrite
  • Orthophosphate

Due to chemical characteristics of anodic inhibitors, they are considered unsafe.

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