I. N. Ulyanov Chuvash State University (Cheboksary, Russia):

I. E. Illarionov, Dr. Eng., Prof, Head of the Dept. “Materials science and metallurgical processes”, e-mail: tmilp@rambler.ru

I. A. Strelnikov, Cand. Eng., Associate Prof, Dept. “Materials science and metallurgical processes”, e-mail: avgustaf@list.ru

“Elkon” JSC (Cheboksary, Ruissia):
Sh. V. Sadetdinov, Dr. Chem., Chief Technolgist, e-mail: ivan-fadeev-2012@mail.ru

I. Ya. Yakovlev Chuvash State Pedagogic University (Cheboksary, Russia):
I. V. Fadeev, Cand. Eng., Head of Engineering Science Dept.

“Diskom” JSC (Cheboksary, Russia):

E. P. Shalunov, Cand. Eng., Innovations Director

For the first time, the effect of borate compounds of tetraborate diaminopropanol (TBDAP), tetraborate  diethylenediamine (TBDEDA) and pentaborate hexamethylenetetramine (PBHMTA) on the corrosion resistance of St3 steel in 3% aqueous solutions of ML-52, MS-8 and Labomid-203 synthetic detergents (SD) has been studied. The technological conditions for synthesis of these borate compounds and their physicochemical characteristics were presented. By measuring the stationary potential of St3 steel in time in the 3% aqueous solution of MS-8 in the presence of TBDAP of various concentrations, its optimal concentration equal to 5 g/l was established. The study of the corrosion rate of the steel in SD solutions with introduction of TBDAP, TBDEDA and PBHMTA showed that in the presence of the indicated borate additives, the corrosion rate of THE steel in SD solutions decreased, and according to the degree of the corrosion rate deceleration, they rank in the TBDAP> PBGMTA> TBDEDA order. Electrochemical tests have confirmed that St3 steel is intensively dissolved in SD solutions. The introduction of TBDEDA, PBHMTA and TBDAP borate additives in an amount of 5 g/l in 3% aqueous solutions of ML-52, Labomid-203 and MS-8 shifts the dissolution potential of St3 steel in a positive direction relative to the corrosion potential (Ecor) in the background electrolyte, mainly slowing down the anode process. The test results of the washing properties of SD and the wettability of St3 steel in ML-52, Labomid-203 and MS-8 aqueous solutions in the presence of borate additives confi rmed that the addition of PBHMTA has almost no effect on the washing property and wettability of SD, and the introduction of TBEDA and TBDAP increases the considered properties of SD.

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