ECHPAS 28 Passivation without Chrom

ECHPAS 28, which does not contain chromium and can be applied by immersion and spraying, has an acidic and inorganic structure. In the phosphating process, it is used to remove salts formed on the metal surface by cations such as Na+, K+, Ca+, Mg+, and anions such as Cl-, SO4-2, NO3-, etc., present in the water. If these salts are not removed through the passivation process, the moisture in the air diffuses into the phosphate-coated metal surface covered with a semi-permeable paint layer, leading to salt formation and consequently causing the paint layer to swell and tear. Therefore, the passivation process is essential to increase the corrosion resistance and paint adhesion properties of the metal.