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通过分析不同粗糙度下的316L不锈钢在0.01 mol/L Na Cl溶液中小孔腐蚀早期的电流波动,研究了粗糙度与不锈钢亚稳态孔蚀电位Em和稳定孔蚀电位Eb之间的关系,以及粗糙度(Ra)对亚稳态小孔生长机制的影响。结果表明,Em和Eb均随Ra的对数的增大而线性下降;Ra增大,亚稳孔的平均形核率和平均寿命增大,生长速率变化不大,但是同样的生长速率下粗糙表面的亚稳孔具有更强的可持续生长能力,加之高的形核频率导致强的腐蚀累积效应促进了亚稳态小孔向稳定孔的转变。
The relationship between the roughness and the metastable pitting potential Em and the stable pitting potential Eb of stainless steel was studied by analyzing the current fluctuation in early corrosion of 316L stainless steel in 0.01 mol / L NaCl solution under different roughness. And roughness (Ra) on metastable pinhole growth mechanism. The results showed that both Em and Eb decreased linearly with the logarithm of Ra. When Ra increased, the average nucleation rate and average life span of metastable pores increased but the growth rate did not change much. However, at the same growth rate, Metastable pores on the surface have a stronger ability of sustainable growth. Combined with high nucleation frequency, the strong cumulative effect of corrosion promotes the transformation from metastable pores to stable pores.