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3 304不锈钢在pH=5.4溶液中不同钝化膜形成电位下PDM最优化模型参数值

Table 3 Calculated values of various parameters from optimization of the PDM based on the experimental impedance data for 304 stainless steel in pH=5.4 solution at different applied potentials

Parameter	0.3 / V	0.4 / V	0.5 / V	Stage optinization
Polarizability α	0.34	0.25	0.25	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	7.34×10^-5	3.53×10^-5	4.14×10^-5	Second stage optimization
CPE-α	1	1	0.94	Second stage optimization
Warburg coeff. σ / Ω·cm²·s^-0.5	1.07×10⁴	6.91×10⁴	7.38×10⁴	Second stage optimization
Electronic resistance R_{e, h} / Ω·cm²	3.78×10¹²	7.07×10¹²	7.67×10¹²	Second stage optimization
Double layer capacitance C_dl / F·cm^-2	3.14×10^-5	6.99×10^-5	1.13×10^-4	Second stage optimization
Charge transfer resistance R_ct / Ω·cm²	1.08×10⁶	3.37×10⁵	4.19×10⁵	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	15.22	13.4	15.66	Second stage optimization
Thickness of barrier layer L_ss / nm	2.36	2.99	3.33	Second stage optimization
Diffusivity of principal defect D / cm²·s^-1	1.85×10^-10	5.45×10^-19	4.66×10^-19	Second stage optimization