Effect of Alloy Elements on Corrosion Resistance of ZA27 Alloy
The electrochemical parameters of seven ZA27 alloys,which contains(mass fraction) 3.0%Cu,0.06%Mg,0.1%Si,0.75%Mn,0.2%Sb,0.1%Sn and no alloy element,respectively,such as self-corrosion potential,linear polarization resistance,self-corrosion current and Tafel constant,were measured by using PS-168C electrochemistry measurement system in 3.5%NaCl solution.The surface morphology of the samples before and after corrosion test was observed by scanning electron microscopy.The results show that all the elements mentioned above,especially Sn,decrease the corrosion resistance of ZA27 alloy.