Effect of Alkali Metals on the Corrosion-Electrochemical Behavior of Lead Babbitts B(PbSb15Sn10) in a NaCl Medium
摘要
The paper presents the results of a study of the effect of lithium, sodium and potassium additives (0.01–1.0 wt %) as structure modifiers on the anodic behavior of lead babbitts B(PbSbl5Snl0) in NaCl solution. The studies have been carried out potentiostatically in a potentiodynamic mode with a potential scan rate of 2 mV/s. Studies have shown that over time, the free corrosion potential of alloys shifts to the positive side and acquires a positive value with an increase in the concentration of the modifier (lithium, sodium and potassium) in lead babbitts. The addition of lithium to lead babbitt B(PbSb15Sn10) increases its corrosion resistance by 8–14%, sodium by 10–16% and potassium by 12–20%. An increase in the corrosion rate of alloys, regardless of their composition, was noted on the concentration of NaCl in the solution. It is shown that an increase in the concentration of chloride ion in the NaCl solution leads to a decrease in the potentials of free corrosion, repassivation and pitting formation of alloys.