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Several common types of corrosion failure in heat exchangers
Mar 16, 2020

1. Uniform corrosion occurs on the entire exposed surface of the medium, or on a larger area, and the macroscopic uniform corrosion failure is called uniform corrosion.

 

2. Contact corrosion two kinds of metal or alloy with different potential are in contact with each other and immersed in the solution of electrolyte solution. There is an electric current between them.

 

3. Selective corrosion the phenomenon that an element in an alloy enters the medium preferentially due to corrosion is called selective corrosion.

 

4. The corrosion concentrated in the metal surface of a small point with a greater depth of corrosion is called hole corrosion, or said to be small hole corrosion, pitting.

 

5. Crevice corrosion severe crevice corrosion will occur in the cracks and covered parts of the metal surface.

 

Erosion erosion is a corrosion process that is accelerated by the relative motion between the medium and the metal surface.

 

Intergranular corrosion intergranular corrosion is a kind of corrosion that preferentially corrodes the grain boundary and the area near the grain boundary of a metal or alloy, while the grain itself corrodes less.

 

8. Stress corrosion cracking (SCC) and corrosion fatigue SCC are the fractures of materials caused by the combined action of corrosion and tensile stresses in a certain metal-medium system.

 

Hydrogen destructive metals in electrolyte solutions can cause damage due to hydrogen penetration due to corrosion, pickling, cathodic protection, or electroplating.

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