Chuvash State University (Cheboksary, Russia):

I. E. Illarionov, Dr. Eng., Prof, Head of the Chair “Metal science and metallurgical processes”, e-mail: tmilp@rambler.ru
Sh. V. Sadetdinov, Dr. Chem., Prof., the Chair “Metal science and metallurgical processes”
I. A. Strelnikov, Cand. Eng., Assocoate Prof., the Chair “Metal science and metallurgical processes”
V. A. Gartfelder, Cand. Eng., Prof., Dean of the Machine-building faculty

Methods of physicochemical analysis revealed formation of new phosphate borate compounds in the systems of sodium penta-, tetra-, metaborate-trisodium phosphate-water at 25 °C. It has been found that sodium borates react with trisodium phosphate to form phosphate borates of the following compositions: 3NaB₅O₈ · Na3PO4 · 4H₂O, Na₂B₄O₇ · Na₃PO₄ · 5H₂O and 2NaBO₂ · Na₃PO₄ · 4H₂O. The effect of phosphate borate compounds on the corrosion resistance of steel 10 in a 3% solution of sodium chloride was studied by gravimetric, corrosion-electrochemical and corrosion-fatigue tests. It has been shown that phosphate borate compounds are effective anticorrosive additives and they have a greater inhibitory ability than sodium pentaborate, sodium tetraborate, sodium metaborate and trisodium phosphate taken separately. Electrochemical studies have shown that phosphate borate compounds are predominantly anode action inhibitors. Addition of 5 g/l phosphate dimaborate to a 3% NaCl solution significantly increases the cyclic strength of the steel. Increase in the anti-corrosion resistance of carbon steel in an aggressive environment in the presence of phosphate borate compounds of steel 10 is due to formation of a dense protective ferrohydroxophosphate-borate film on the metal surface.

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