Formation of residual stresses during the restoration of parts by chrome electroplating

Abstract

As the title implies the influence of the electrolysis on the nature and magnitude of residual stresses in the steel base and the chrome coating during restoration of parts has been considered. It has been shown that with an increase in compressive stresses on the surface, a decrease in tensile stresses in the chromium deposit and transition of tensile stresses to compressive ones near the boundary of the base are observed. A correlation between the parameters of the crystal lattice of electroplated chromium and the steel base has been established. The values of the tensile residual stresses in the chromium deposit decrease with increasing the compressive residual stresses in the base.

Pump elements recondition by electrolytic chromium plating

“…In reconditioning the fuel pump plungers with chrome plating with an inner valve diameter of 10 mm. depending on the potential function, the mode and the speed of electrochemical conversions change [9,10,11,15]. The latter is illustrated by polarization curves obtained by the potentiostatic method in a chromic acid solution (250 g/lCrО3) with and without the addition of 2.5 g/lH2SO4 at 18qС.…”