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The electrochemical corrosion maintenance of plate heat exchanger

by:DIGUANG     2020-03-29
Plate heat exchanger in the applications should be how to maintain the corrosion? Know the cause of various corrosion of heat exchanger, the choice of reasonable anticorrosion measures, to achieve the purpose of efficient use of equipment. Focusing on the corrosion situation, put forward the following anti-corrosion methods: here mainly introduces corrosion inhibitor and electrochemical protection. 1. Corrosion inhibitor with chromate salt as the main component of corrosion inhibitors is commonly used in cooling water system, chromium acid radical ion is an anode ( The process) Inhibitors, when combined with proper cathodic inhibitors, can get satisfactory anticorrosive and economic effect. Chromate - Zinc - - - - - - - Polyphosphates: poly phosphate is used because it is a clean metal surface, corrosion ability, polyphosphate can partially into orthophosphate, they can also with the larger of colloidal calcium cation, the inhibition of cathodic process. Chromate - Zinc - - - - - - - Phosphonic acid salt: use this method instead of phosphonic acid sodium polyphosphate on the outside and a method similar to that of amino methylene phosphate can also be used for ratio of polyphosphate by pH value is higher. Amino methylene phosphonic acid salt can prevent scale, even a pH value of 9 can control calcium salt precipitation. Chromate - Zinc - - - - - - - Hydrolyzed polyacrylamide: as a result of the cationic copolymer hydrolyzed polyacrylamide dispersion effect, can prevent or inhibit scale into dirt. 2. Electrochemical protection using cathodic protection and anodic protection. Cathodic protection is used with dc power supply, make it become a cathode metal surface and protect, in power consumption, high cost. Anodic protection is the protection of the heat exchanger to plus the power of the anode, the metal surface passivation film, so as to be protected. The above content is the method of electrochemical protection plate heat exchanger, through understanding is of great help to maintenance of plate heat exchanger anticorrosion.
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