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

Sh. V. Sadetdinov, Dr. Chem., Prof., Dept. “Materials science and metallurgical processes”, E-mail: avgustaf@list.ru
D. A. Pestryaev, Student

Chuvash State Agrarian University (Cheboksary, Ruissia):
L. Sh. Pestryaeva, Cand. Ped., Associate Prof.

I. Ya. Yakovlev Chuvash State Pedagogic University (Cheboksary, Russia):
I. V. Fadeev, Cand. Eng., Associate Prof., Head of Engineering Science Dept., E-mail: ivan-fadeev-2012@mail.ru

For the first time, the corrosion resistance of ST10 steel in a 3% NaCl solution in the presence of lithium dipynaconborates (DPBL), sodium (DPBN) and potassium (DPBK) was studied. The method of synthesis of these dipinaconborates is given and their physical and chemical characteristics are determined. Experiments on the measurement of stationary potential high resistance voltmeter potentiostat P-5848 shown that the introduction of dipingere lithium, sodium and potassium in 3% NaCl solution leads to a noticeable increase of the corrosion resistance of steel and pestiviruses action definecolor are in a row DPBC > DPPN > DPBL. According to the obtained data of anodic polarization in a 3% aqueous solution of NaCl, the steel is actively dissolved, and when 0.1 mol/l is added, THE steel passes into a passive state. The increase in the corrosion resistance of steel is explained by the formation of a dense passive ferrohydroxoborate film on the metal surface. Gravimetric studies with the determination of the average corrosion rate, braking coefficient and degree of protection of steel St. 10 in a 3% solution of NaCl with the addition of dipineaconborates of lithium, sodium and potassium of various concentrations found that the concentration of 0.5% is optimal for them. Fatigue and corrosion-fatigue tests of ST10 steel in a solution of sodium chloride without additives and with the addition of DPBK, DPBN, DPBL showed that dipinaconborates equally reduce the destructive effect of purely corrosive and corrosion-mechanical lesions. When the content of 0.5% of potassium dipineaconborate in a solution of sodium chloride, the cyclic strength of steel increases, which is associated with a decrease in the destructive factors in reducing the cyclic strength of steel under the effect of DPBK.

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