基于<strong>PDM</strong>的<strong>304</strong>不锈钢钝化膜生长动力学研究

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2 304不锈钢在pH=1.4溶液中不同钝化膜形成电位下PDM最优化模型参数值

Table 2 Calculated values of various parameters from optimization of the PDM based on the experimental impedance data for 304 stainless steel in pH 1.4 solution at different applied potentials

Parameter	0.3 / V	0.4 / V	0.5 / V	Stage optinization
Polarizability α	0.45	0.45	0.44	Second stage optimization
Transfer coeff. α₂	0.23	0.23	0.23	Average of first stage optimization
Transfer coeff. α₃	0.66	0.66	0.66	Average of first stage optimization
Transfer coeff. α₇	0.49	0.49	0.49	Average of first stage optimization
Rate constant $k_{2}^{00} /$ mol·cm^-2·s^-1	4.67×10^-13	4.67×10^-13	4.67×10^-13	Average of first stage optimization
Rate constant $k_{3}^{00}$ / mol·cm^-2·s^-1	3.78×10^-17	3.78×10^-17	3.78×10^-17	Average of first stage optimization
Rate constant $k_{7}^{00}$ / mol·cm^-2·s^-1	6.16×10^-15	6.16×10^-15	6.16×10^-15	Average of first stage optimization
CPE-Y / S·s ^α ·cm^-2	4.18×10^-5	3.92×10^-5	3.86×10^-5	Second stage optimization
CPE-α	0.94	0.95	0.95	Second stage optimization
Warburg coeff. σ / Ω·cm²·s^-0.5	3.03×10⁵	2.14×10⁵	1.56×10⁵	Second stage optimization
Electronic resistance R_{e, h} / Ω·cm²	7.82×10⁶	1.72×10⁷	9.93×10¹²	Second stage optimization
Double layer capacitance C_dl / F·cm^-2	1.51×10^-4	9.56×10^-5	6.91×10^-5	Second stage optimization
Charge transfer resistance R_ct / Ω·cm²	1.75×10⁵	2.88×10⁵	4.22×10^-5	Second stage optimization
Strength of electric field ε / V·cm^-1	2.03×10⁶	2.03×10⁶	2.03×10⁶	Average of first stage optimization
Kinetic order of H⁺n	0.5	0.5	0.5	Average of first stage optimization
Current density I_ss / nA·cm^-2	16.15	20.24	24.56	Second stage optimization
Thickness of barrier layer L_ss / nm	1.24	1.47	1.74	Second stage optimization
Diffusivity of principal defect D / cm²·s^-1	1.34×10^-18	8.64×10^-19	6.43×10^-19	Second stage optimization