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Cross-flow evaporative condenser anti-corrosion maintenance knowledge
Nov 07, 2018

In the use of cross-flow evaporative condensers, some measures can be taken to ensure their performance. Special attention should be paid to the protection of the heat exchange tubes, which can be electrogalvanized. The electroplating of zinc is deposited on the outer surface of the carbon steel tube by direct current or pulse current electrolysis. The thickness of the zinc coating is generally 20-30 um. The zinc coating is a normal temperature protective layer and has good protection.


Another anti-corrosion measure for the heat exchange tubes in the cross-flow evaporative condenser is hot dip galvanizing, which is a cost-effective surface anti-corrosion process. In order to ensure smooth plating on the outer surface of the tube, the outside of the tube is sprayed with compressed air, and then passivated. The hot dip galvanizing process outside the tube makes the zinc layer have strong adhesion, the thickness is generally about 80um, and the thickness is uniform, which effectively improves the problem of accelerating the electrochemical corrosion of the heat exchange tube due to the low quality of electroplating zinc.


In addition, corrosion-resistant zinc-iron alloy plating process can be used to enhance its corrosion resistance. In this way, the crystal grains of the heat exchange tube coating in the cross-flow evaporating condenser can be made uniform, finer and denser than the pure zinc plating layer, and have higher corrosion resistance than the pure zinc layer in the corrosive medium. It has no pollution to the environment and costs less than galvanizing.https://www.gwbrefrigeration.com/