基于PDM的304不锈钢钝化膜生长动力学研究
毛飞雄, 周羽婷, 姚文清, 沈翔, 肖龙, 李明辉

Growth Kinetics of Steady-state Passive Film on Type 304 Stainless Steel Based on Point Defect Model
MAO Feixiong, ZHOU Yuting, YAO Wenqing, SHEN Xiang, XIAO Long, LI Minghui
表4 304不锈钢在pH=9.4溶液中不同钝化膜形成电位下PDM最优化模型参数值
Table 4 Calculated values of various parameters from optimization of the PDM based on the experimental impedance data for 304 stainless steel in pH 9.4 solution at different applied potentials
Parameter0 / V-0.1 / V-0.2 / VStage optinization
Polarizability α0.450.2826240.289249Second stage optimization

Transfer coeff.

α2

0.230.230.23Average of first stage optimization

Transfer coeff.

α3

0.660.660.66Average of first stage optimization

Transfer coeff.

α7

0.490.490.49Average of first stage optimization

Rate constant

k200 / mol·cm-2·s-1

4.67×10-134.67×10-134.67×10-13Average of first stage optimization

Rate constant

k300 / mol·cm-2·s-1

3.78×10-173.78×10-173.78×10-17Average of first stage optimization

Rate constant

k700 / mol·cm-2·s-1

6.16×10-156.16×10-156.16×10-15Average of first stage optimization
CPE-Y (S·s α ·cm-22.39×10-52.70×10-53.97×10-5Second stage optimization
CPE-α0.910.910.89Second stage optimization

Warburg coeff.

σ / Ω·cm2·s-0.5

8.48×1053.82×1056.28×105Second stage optimization

Electronic resistance

Re, h / Ω·cm2

1.00×10139.81×10129.99×1012Second stage optimization

Double layer capacitance

Cdl / F·cm-2

2.23×10-448.99×10-42.32×10-4Second stage optimization

Charge transfer resistance

Rct / Ω·cm2

1.18×1052.03×1046.02×104Second stage optimization
Strength of electric field ε / V·cm-12.03×1062.03×1062.03×106Average of first stage optimization
Kinetic order of H+n0.50.50.5Average of first stage optimization

Current density

Iss / nA·cm-2

13.939.918.62Second stage optimization

Thickness of barrier layer

Lss / nm

2.081.991.66Second stage optimization

Diffusivity of principal defect

D / cm2·s-1

2.32×10-181.08×10-181.34×10-18Second stage optimization