Corrosive Protection of Metal Materials in Cooling Water

The work deals with the study on the influence of the inhibitor based on phosphonates (S-fp) on corrosion protection of metal materials in cooling water. The specimens, in a form of corrosive coupons, have been placed in an open circulating system of the cooling water for one month. The protective effect of S-fp inhibitor is based on production of insoluble salts with Ca2+, Zn2+ ions present in the cooling water and on forming a protection layer on the surface of exposed metal coupons. The corrosion rate in cooling water with and without inhibitor was determined by measuring of weight change of exposed coupons. The analysis of samples surface was carried out, too. After one month exposure, the coupons were removed from the corrosion slings of the cooling system. The highest inhibitor efficiency was observed on coupons from brass. The addition of inhibitor to cooling water increases corrosion resistance of metal materials by formation a high quality protective layer on their surface.