AZ91镁合金和MAO涂层的点蚀行为研究

刘玉项, 徐安阳

Characterization of Pitting Corrosion Behavior of AZ91 Mg-alloy without and with MAO Coating

LIU Yuxiang, XU Anyang

表1 AZ91镁合金和MAO涂层循环极化曲线上A,B和C点的电位和电流密度

Table 1 Potentials and current densities at the points A, B and C of cyclic polarization curves of AZ91 Mg-alloy and MAO coating in Fig.4

Sample A1/A2 B1/B2 C1/C2 ESHE / V I / A·cm-2 ESHE / V I / A·cm-2 ESHE / V I / A·cm-2 AZ91 Mg-alloy -1.339 -1.192×10-5 -1.129 6.004×10-3 -1.263 4.253×10-3 Ecorr vs SHEfor.=-1.329 V, Ecorr vs SHEback.=-1.463 V MAO coating -1.270 6.153×10-7 -1.016 2.637×10-3 -1.271 41.56×10-3 Ecorr vs SHEfor.=-1.216 V, Ecorr vs SHEback.=-1.471 V