در محلول اسيد سولفوريك Fe_CR_Ni بررسي رفتار خوردگي پوشش هاي آلياژي

The Corrosion Behavior of Electrodeposited Fe-Cr-Ni Alloys in Sulfuric Acid Solution

The major interest for, development of chromium alloy deposits is the possible formation of a passive film of chromium oxide. This study, the corrosion behavior of Fe-Cr-Ni alloy electrodeposits is investigated by cyclic polarization in sulfuric acid solution. The localized corrosion susceptibility of alloy deposits at crack tip, is studied by potentiostatic experiments in above-mentioned solution. It is observed that with increasing the current density of electrodeposition, the chromium and nickel contents and microcracks dimensions in the alloy deposits are increased. Therefore, the enhancement in corrosion resistance is likely due to the passivation behavior due to increasing the chromium and nickel contents. The passivation behavior of alloy deposits is similar to stainless steels with same passive current density but lower passivation potential range. This effect is attributed to the presence of microcracks in microstructure of the alloy deposits.