【摘要】 利用电化学噪声研究了纯镁在不同厚度薄液膜下的腐蚀行为.结果表明:与本体溶液相比,薄液膜对纯镁腐蚀的阳极过程有使点蚀的孕育速度减缓作用的同时还有使点蚀生长的概率增加的作用;薄液膜下纯镁表面产生的亚稳态点蚀生长成稳态点蚀的概率比本体溶液下的大.点蚀孕育速度比点蚀生长概率对阳极过程的影响更大;这导致了薄液膜下纯镁腐蚀的阳极过程减缓.更多还原

【Abstract】 Corrosion behavior of pure magnesium under thin electrolyte films was investigated by means of electrochemical noise(EN).Based on shot noise theory and stochastic theory,the EN results were quantitatively analyzed by using the Weibull and Gumbel distribution function,respectively.The experimental results revealed that thin electrolyte film had two opposite effects on anodic process of pure magnesium corrosion.On one hand,the pit initiation rate was retarded.The frequency of corrosion events under electrolyte film was greatly lowered compared to that in bulk solution.On the other hand,the pit growth probability was increased.The metastable pit induced by thin electrolyte film on pure magnesium had a higher probability to become larger pit cavity than that in bulk solution.Pit initiation rate had greater influence on the anodic process than pit growth probability,which led to the inhibition of the anodic process of pure magnesium with the decreasing of thin electrolyte film thickness.更多还原