Анодное поведение свинцового баббита БСт (PbSb15Sn10Sr), модифицированного стронцием, в среде электролита NaCl

Abstract

The article presents the results of a study of the effect of strontium additives (0.01 – 1.0 wt. %) as a structure modifier on the anodic behavior of lead babbit (PbSb15Sn10Sr) in the NaCl electrolyte medium. The studies were carried out by the potentiostatic method in the potentiodynamic mode with a potential sweep rate of 2 mV/s. Studies have shown that over time, the free corrosion potential of alloys shifts to the positive side and with an increase in the concentration of the modifier (strontium) in lead babbit, it acquires a positive value. The addition of strontium to lead babbitt (PbSb15Sn10Sr) increases its corrosion resistance by 10 – 15 %. An increase in the corrosion rate of alloys was noted, regardless of their composition from the NaCl concentration in the solution. Studies have shown that an increase in the concentration of the chloride ion in the NaCl electrolyte leads to a decrease in the potentials of free corrosion, repassivation, and pitting of alloys.