POTENTIODYNAMIC STUDY OF LEAD BABBITA BT (PbSb15Sn10), WITH SODIUM, IN THE MEDIUM OF ELECTROLYTE NaCl

Abstract

In connection with the active development of modern technology, there is a need to create materials that work reliably in a complex combination of force and temperature fields, when exposed to aggressive media and high pressures. One of the effective ways to solve this problem is the creation of structural materials with increased corrosion resistance, due to which these materials acquire qualitatively new, often unique properties. It should be noted that the development of new structural materials is currently a key direction along with the improvement of existing ones in the development of modern materials science.

The article presents the results of a potentiostatic study of sodium-modified lead babbit BT (PbSb15Sn10) in NaCl electrolyte at a potential change rate of 2 mV/s. Sodium additions to lead babbitt PbSb15Sn10 were 0.01-1.0 wt.  %. The studies were carried out in an aqueous NaCl electrolyte solution with a concentration of 0.03; 0.3 and 3.0 wt.  %. It is shown that the addition of sodium in the range of 0.01-1.0 wt. % to the PbSb15Sn10 alloy reduces its corrosion rate by 10-15 %, as a result of a shift in electrochemical potentials to the region of positive values. For example, the pitting potential shifts to positive values from -0.510V for the original alloy to -0.450V for an alloy containing 1.0 wt. % sodium. An increase in the concentration of NaCl in the electrolyte leads to an increase in the corrosion rate of the alloys and a shift in the electrochemical potential towards negative values.