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Introduction

Corrosion is the deterioration of a metallic substance (usually as a natural consequence of a metal’s temporary existence in metallic form) due to its reaction with the environment. A corrosive environment can consist of many different corrosive elements, and it is common not to have all corrosive pollutants in a single corrosive environment. Common corrosive elements include: moist air, hot air, hot water, polluted air, acids and salt water.

In certain environments, these elements combine to form highly corrosive conditions which degrade metallic surfaces. If left unchecked these will require complete replacement in the fullness of time.

Common corrosive environments include: marine/industrial (severe), coastal/marine (severe), industrial (heavy to severe), urban (mild to heavy) and suburban (mild to heavy).

Galvanic corrosion is where two dissimilar metals are in contact with each other within a moist environment – there is no better representation of this than in a standard air cooled condenser coil where commonly aluminium fins and copper coils interface as part of the heat exchange process.