ПРОТИВОКОРРОЗИОННАЯ ЗАЩИТА МЕДИ МАСЛЯНЫМИ КОМПОЗИЦИЯМИ С КОМБИНИРОВАННОЙ ДОБАВКОЙ М-531

Abstract

The use of anti-corrosion protection is necessary to maintain the performance of agricultural machinery and equipment. The effectiveness of oil compositions with the addition of M-531 in relation to copper was studied. The compositions were obtained on the basis of industrial and motor M10G2k (both fresh and used) oils. Their protective ability was studied using gravimetric and electrochemical methods (polarization and impedance) studies. According to the data obtained from corrosion gravimetric tests in 0.5 M NaCl, it was noted that compositions based on M10G2k oil turned out to be the most effective when 5 wt. % of the additive, the protective effectiveness (Z) was 63%, a further increase in concentration led to a slight increase to Z = 65% at 10 wt. % M-531. The data from electrochemical measurements qualitatively confirm the data from gravimetric tests. Differences in the magnitude of protective effectiveness are associated primarily with different times of exposure to an aggressive environment: the duration of the experiment in the first case was 15 minutes, in the second - 14 days. According to the results of polarization measurements, compositions based on MMO were the most effective, already at a content of 5 wt. % additive value Z = 98%, while compositions containing 5 wt. % M-531 in I20-A and M10G2k had Z = 90%. The results of impedance studies showed that the addition of the M-531 inhibitor to MMO, M10G2K and I20-A oils affects the copper impedance hodographs. The inhibitor concentration had a significant effect on the change in Nyquist diagrams. At 3 wt. % M-531, a moderate change in copper plating impedance was observed, indicating that the inhibitor has some protective ability against corrosion, but its effectiveness may not be sufficient to fully protect copper. When the inhibitor concentration increases to 5 - 7 wt. % noticeable increase in the change in impedance indicated that a higher concentration of the M-531 inhibitor helps to improve the protective properties of the copper coating.