Effects of W Addition on the Electrochemical Behaviour and Passive Film Properties of Fe-Based Amorphous Alloys in Acetic Acid Solution

• 来源期刊: 金属学报（英文版）
• 年，卷（期）: 2018,（10）
• 页码范围: 1098-1108
• 页数: 11页
• 语种: 英文

摘要

The electrochemical behaviour and passive film properties of Fe-Cr-Mo-W-C-B-Y amorphous alloys in acetic acid solution were investigated.The potentiodynamic polarisation and Nyquist curves demonstrated that W addition significantly enhanced the corrosion resistance.Mott-Schottky plots and angle-resolved X-ray photoelectron spectra indicated that passive films with different W contents exhibited dipolar (p-n) semiconducting characteristics separated by flat-band potentials.The outer and inner oxide layers of the passive films were modified by reducing the acceptor and donor densities.Moreover,W addition favoured the formation of a thicker and more stable passive film to inhibit the dissolution of alloy elements.