Effects of Cu and Sb on Corrosion Resistance of ZnAl27 Alloy

Abstract

The corrosion behavior of ZnAl27 alloys in 35g/L NaCl solution has been studied by electrochemical and immersion corrosion tests. The effects of Cu and Sb on the Tafel curves, electrochemical parameters of free corrosion potential, linear polarisation resistance (LPR) and free corrosion current, of the ZnAl27 alloy have been investigated. The surface morphologies of the alloy after immersion corrosion tests have been observed through SEM. The results indicate that addition of proper Cu can improve its corrosion resistance of the alloy, or the free corrosion potential the corrosion current shift towards the positive and negative,respectively. However, excessive addition of Cu can deteriorate the corrosion resistance of the alloy. On the other hand, the corrosion resistance of the ZnAl27 alloy decreases with the increasing of Sb content.

Study on Mechanical Properties of High Aluminum Zinc-Based Alloys with Different Al Contents Ranging from 30 wt% to 50 wt%

“…High aluminum zinc-based alloys are antifriction materials which have been developed in recent years [1][2][3][4][5]. The alloys have excellent mechanical properties, antifriction performance with energy saving and low fabricating cost, therefore they have been paid more attention gradually in various bearing bush in field of machine tools, mineral, sugar making machineries.…”