EFFECT OF THE ELECTRODEPOSITION CONDITIONS ON THE EROSION CORROSION OF AUSTENITIC STAINLESS STEEL 316L USING RESPONSE SURFACE METHODOLOGY (RSM)

Abstract

This study represents an attempt to improve the erosion corrosion resistance for industrial pumping station used to produce sulfuric acid through electrodeposition coating samples of Austenitic stainless steel 316L. Minitab 19 program was used to precipitate a composite coating layer (Cr-WC) because it is used in many industrial applications that require corrosion resistance, As well as high hardness. The samples were coated using different variables as inputs: temperature(T), WC concentration(WC wt% ), stirring velocity (r.p.m) and deposition time (t) for four levels using central composite design for design laboratory experiments. The factors of coating thickness (C.T), surface roughness (Ra) and micro- hardness (HV) were adopted as outputs response and a complete analysis of variances (ANOVA) at constants significances levels of %5, was done to fully identify the most significant parameters.The surface response methodology (RSM) was used to provide an optimized model with the best optimum properties such as micro-hardness, surface roughness, coating corrosion rate and oxidation corrosion rate to improve the corrosion resistance of Austenitic 316L stainless steel samples.The results showed respectively that the wc wt.% was the most effective on all the outputs response then deposition time (min), temperature(T) and stirring velocity (r.p.m).