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2022

How should the welded plate and frame heat exchanger be maintained and anti-corrosion in application

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Knowing the causes of various corrosion of heat exchangers and choosing reasonable anti-corrosion measures can achieve the purpose of efficient utilization of equipment. In view of the relevant corrosion situation, the following anti-corrosion methods are proposed: Corrosion inhibitors and electrochemical protection are mainly introduced here.

1. Corrosion inhibitor
Chromate-based corrosion inhibitors are commonly used in cooling water systems. Chromate ion is an anodic (process) inhibitor that, when combined with a suitable cathodic inhibitor, can be obtained satisfactorily and economically. anti-corrosion effect.
Chromate-zinc--polyphosphate: The use of polyphosphate is because it has the effect of cleaning the metal surface and has the ability to inhibit corrosion. Polyphosphate can be partially converted into orthophosphate, and they can also generate large amounts of calcium with calcium. The colloidal cations inhibit the cathodic process.
2. Electrochemical protection
Adopt cathodic protection and anodic protection. Cathodic protection is to use an external DC power supply to make the metal surface become 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 to the anode of the external power supply, so that a passivation film is formed on the metal surface, so as to be protected.
The above content is the electrochemical protection method of welded plate-and-frame heat exchanger, which is of great help to the maintenance and anti-corrosion of welded plate-and-frame heat exchanger.