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Plate Heat Exchanger protection method
Mar 16, 2021

① inhibitor is in a chromate as a main component is a common corrosion inhibitor in cooling water systems , chromium ion has an anode ( process ) inhibitors , when it is combined with a suitable cathode inhibitors , can be obtained so that Satisfactory and economical anti-corrosion effect. Chromate - zinc - polyphosphate : Polyphosphate is used because it has the function of cleaning the metal surface and has corrosion inhibition ability . Polyphosphate can be partially converted into orthophosphate , and they can also generate large amounts of calcium. cationic colloids , inhibiting cathodic process. Chromate - zinc - phosphonate : This method is similar to a method used on the outside instead of sodium polyphosphate phosphonate , amino-methylene phosphates can also be used as polyphosphate ratio specified pH value to High occasions. Amino methylene phosphonate can prevent scale and control the precipitation of calcium salt even with a pH of 9 . Chromate - zinc - hydrolyzed polyacrylamide : due to the dispersing effect of the cationic copolymer hydrolyzed polyacrylamide , it can prevent or inhibit the generation of scale into dirt. ②The electrochemical protection adopts cathodic protection and anode protection. Cathodic protection is the use of an external DC power supply to make the metal surface a cathode to achieve protection . This method consumes a lot of power and is expensive. The anode protection other than the protection power plus a heat exchanger connected to the anode, the metal surface generated passive film , to thereby obtain protected.

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