Acidic Corrosion

Definition - What does Acidic Corrosion mean?

Acidic corrosion occurs in stone and metals that are prone of high salinity, chemicals, low oxygen and harsh environmental operating conditions. Acidic corrosion is a gradual destruction and wearing away of a material (e.g., metal) due to acidic compounds present in the environment. The acids may be those coming from soil, industrial air, water or toxic chemicals that react with the material they contact.

Corrosionpedia explains Acidic Corrosion

The cause of acidic corrosion in industrial equipment is due to an electrochemical reaction. Three conditions must exist:

  • A electric potential difference must exist on the metal surfaces where the acidic corrosion is occurring
  • A charge transfer must occur between conductors
  • A continuous conduction path exists between anodic and cathodic centers

An electrochemical reaction is a process in which electrons flow between a solid electrode and another substance such as an electrolyte. This flow triggers an electric current through the electrodes, causing the reaction to liberate or absorb heat.

Acidic corrosion of boilers and furnaces is sometimes caused by chemical cleaning.

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