Common anticorrosion methods of heat exchanger

The influence of heat transfer process on Corrosion Behavior of metals is different with and without heat transfer.

Generally speaking, heat transfer aggravates the corrosion of metals, especially in the presence of boiling, vaporization or overheating. In different media, or for different metals, the effect of heat transfer is also different. Only by understanding the causes of various corrosion of heat exchanger and selecting reasonable anti-corrosion measures can we achieve the purpose of efficient utilization of equipment. Corrosion inhibitors and electrochemical protection are commonly used.

The corrosion inhibitor with chromate as the main component is commonly used in cooling water system. When it is combined with appropriate cathodic inhibitor, it can obtain satisfactory and economical corrosion protection effect.

Cathodic protection and anode protection are used for electrochemical protection. Cathodic protection is to use the external DC power supply to change the metal surface into a cathode to achieve protection. This method consumes a lot of electricity and costs a lot. Anode protection is to connect the protected heat exchanger with the anode of external power supply to form a passive film on the metal surface, so as to obtain protection.

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