EIS研究7050铝合金在NaCl溶液空蚀作用下的界面状态与腐蚀机制

夏大海, 潘成成, 郭玉杰, 胡文彬, TRIBOLLET Bernard

Electrochemical Impedance Spectroscopy Analysis on Interface State and Corrosion Mechanism of 7050 Al-alloy Subjected to Cavitation Erosion in NaCl Solution

XIA Da-Hai, PAN Chengcheng, GUO Yujie, HU Wenbin, TRIBOLLET Bernard

表2 非线性回归拟合得到的参数

Table 2 Parameters obtained from the regression of the EIS experimental data

Parameters Unit t = 1 h t = 2 h t = 4 h ρ0 Ω·cm-1 1.02 × 1011 8.74 × 1011 1.41 × 1012 p nm 0.96 0.754 0.58 λ nm 0.141 0.0783 0.0378 Re Ω·cm2 9.61 9.50 9.50 δ cm 1.31 × 10-3 9.01 × 10-4 1.26 × 10-4 k1 mol·cm-2·s-1 2.36 × 10-4 1.234 × 10-4 1.07 × 10-4 b1 V-1 15.83 42.52 69.56 k2 s-1 1.08 × 10-6 2.286 × 10-6 2.67 × 10-6 b2 V-1 9.06 40.06 124.03 k-2 cm·s-1 2.78 × 10-3 6.466 × 10-4 2.973 × 10-4 b-2 V-1 76.11 267.29 132.67 β mol·cm-2 8.22 × 10-4 2.917 × 10-4 2.543 × 10-4 1-θ - 2.25 × 10-6 4.88 × 10-6 6.30 × 10-6 CAl3+ mol·cm-3 1.29 × 10-7 1.00 × 10-7 1.57 × 10-8