Abstract
The phosphorus industry of the Republic of Kazakhstan produces mineral fertilizers, as well as phosphate salts and multifunctional materials. Phosphate salts, including orthophosphates, pyrophosphates, triphosphates, polyphosphates, are effective anti-corrosion materials. The purpose of this work is to study the effect of additives on the production of phosphate-containing composite materials. Results and discussion. Analysis of the obtained results showed that the anticorrosion properties of compositions based on potassium dihydrogen monophosphate with the addition of potassium sulfate and boric acid are influenced by the same factors as in the case of individual salts. In tap water, the composition “KH2PO4 – K2SO4” is characterized by lower values of Vcor. and Vex. compared to the KН2PO4 – H3BO3 system. The degree of metal protection when adding potassium sulfate to tap water is 11.25% higher than when adding boric acid. However, in chloride-containing water, the nature of the additive does not affect the anti-corrosion properties of the composite system. The degree of protection in the studied compositions is almost the same (Z = 55.41-55.07%). It was revealed that in tap water in the “KH2PO4 – K2SO4/H3BO3 – H2O” systems the degree of corrosion and deposits is noticeably lower compared to their values in a chloride-containing environment and, accordingly, the degree of protection in tap H2O is (17.10-5.85)% higher compared to a chloride-containing environment . Conclusion. It has been shown that in tap water in the “KH2PO4 – K2SO4/H3BO3 – H2O” systems the degree of corrosion and deposits is noticeably lower compared to their values in a chloride-containing environment, and accordingly, the degree of protection in tap H2O is (17.10-5.85)% higher compared to a chloride-containing environment. When sulfate or borate ions are introduced into a solution, the rate of the iron ionization reaction in sulfuric acid can decrease, passivation of the metal occurs and the Z of the metal increases.