Study On Performance Of The Pb-Sn Alloy Deposits On Aluminum Prepared For Light-type Grid

A light-type grid material, Pb-Sn alloy deposited on aluminum by electroplating technology, for lead-acid batteries was developed in the present work. The goal is to reduce the weight of the batteries, so the special energy can be promoted. To support the distortion in the charge or discharge processes, nanocompositing method was adopted to enhance the hardness of the deposits, via a theory of dispersion strengthening.Pb-Sn alloy was plated from fluoride acid conventionally. Fluoride acid, however, is of great toxicity, and the waste disposal is difficult. Taking a comprehensive view of electrolyte performance, cost, conveyance, and waste disposal analyzing, sulfamic acid was screened out. To compare the characteristics of sulfamic acid electrolyte, referring to fluoride acid system, hull experiments and cathode voltammetry experiments were used to look for the best technical conditions for Pb-Sn electrodepositing; The surface of the deposit was observed by ESEM, showing that the deposits from sulphamic acid are more compact. The adherence of the deposit was tested by fatigue bending test and scratch test. Linear scanning voltammetry and dipping experiments show that the Pb-Sn deposit prepared in sulfamic acid eleclyte is very corrosion-resist to 5M H2SO4(simulating the ture customance of the lead-acid batteries). But the hardeness of the deposits is extremely low, being anxious for improving.Free-maitainance lead-acid batteris require decreasing the use of Sb to weaken the electrolysis of the H2O. But the passiviation of the Sb-free or low-Sb grid is a fatal weakeness for the deep charging or discharging capability and the work life. In the present work, the electrochemical performance of the Pb-Sn alloy deposits from sulphamic acid was researched in 5M H2SO4, offering an academic theory to ameliorating the quality. According to IMP, OCD, LSV, CV, etc, appropriate content of Sn can reduce the impedence of the PbO membrane evidently.Innovatively, nanocomposting is introduced in, and the hardeness is enhanced remarkably.