New Corrosion Inhibition Approach Under High Corrosive Environment in Cooling Water Systems

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Product Number: 51315-5661-SG

ISBN: 5661 2015 CP

Author: Takeshi Kuribara

Publication Date: 2015

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~Make up water for cooling water systems is diversifying because water shortage becomes serious issue in many countries. Recently RO treated water and/or process condensate are used as make up water. Calcium hardness of make up water forms corrosion protection film on metal surface in cooling water. But RO treated water and process condensate are contained few calcium hardness. Therefore they show high corrosivity in comparison with normal water for industrial use. Phosphate and zinc have been widely used for corrosion inhibitor of heat exchanger tubes and pipes in cooling water systems. Under high corrosivity condition it is necessary to increase these substances concentration for improvement of corrosion inhibition effect. But discharge regulation of plants is becoming sever to reduce environmental load. Corrosion inhibition program is required to reduce phosphate and zinc concentration.To solve the problem mentioned above the function of low molecular weight polymer was focused on. Low molecular weight polymer is normally used for cooling water systems to prevent scaling. New polymer which can form corrosion protection film on rusting area rapidly was developed. Corrosion inhibitor which was blended new polymer showed superior corrosion inhibition effect than conventional inhibitor. Furthermore it is possible to decrease phosphate and zinc concentration under high corrosive environment in cooling water systems.