How to maintain and prevent corrosion of plate heat exchanger during use?
After knowing the various causes of heat exchanger corrosion, how to select appropriate anti-corrosion measures to achieve the goal of efficient use of equipment. According to the corrosion related conditions, the following anti-corrosion methods are proposed: corrosion inhibitors are mainly introduced here.
Use corrosion inhibitor to prevent corrosion. The combination of corrosion inhibitor and cathodic inhibitor can give satisfactory and economical anti-corrosion effect.
Chromate zinc polyphosphate: polyphosphate is used because it has the function of cleaning metal surface and corrosion inhibition. Polyphosphate can be partially converted into orthophosphate, which meets with calcium to form colloidal cation, which has the effect of inhibiting the formation of impurities in plate heat exchanger.
Chromate zinc phosphonate: This method uses sodium phosphonate instead of polyphosphate, which is similar to the previous method. The scale that is about to be formed is effectively inhibited by carbamate phosphate, and the precipitation of calcium salt can be controlled even if the pH value is 9.
Chromate zinc hydrolyzed polyacrylamide: due to the dispersion of hydrolyzed polyacrylamide of cationic copolymer, the scale in plate heat exchanger can be prevented from turning into dirt.