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本文用电化学氢渗透法,研究了钝化膜、极化电位及介质中pH值对氢在稳定奥氏体不锈钢中渗透行为的影响。测定了氢在310奥氏体不锈钢中25℃时的扩散系数为(1.2±0.1)×10~(-8)cm~2/sec;估算了氢在钝化膜中的扩系散数约为10~(-8)cm~2/sec数量级。随着介质中pH值的降低,氢渗透的饱和电流增加。不仅阴极极化可增加氢渗透的饱和电流;当电位超过点蚀击穿电位后,阳极极化也可增加氢渗透的饱和电流。充氢后试样在0.1NH_2SO_4溶液中的阳极极化曲线显著地向右移动;充氢后的固溶处理试祥,也具有明显的晶间腐蚀倾向。
In this paper, the electrochemical hydrogen permeation method was used to study the influence of the passivation film, the polarization potential and the pH value of the medium on the hydrogen permeation in stable austenitic stainless steel. The diffusion coefficient of hydrogen in 310 austenitic stainless steel at 25 ℃ was determined as (1.2 ± 0.1) × 10 ~ (-8) cm ~ 2 / sec. The diffusion coefficient of hydrogen in passive film was estimated to be about 10 ~ (-8) cm ~ 2 / sec order of magnitude. As the pH in the medium decreases, the saturation current of hydrogen permeation increases. Not only does cathodic polarization increase the saturated current through which hydrogen permeates, but when the potential exceeds the pitting breakdown potential, the anodic polarization also increases the saturation current through which hydrogen permeates. The anodic polarization curves of the samples in 0.1NH_2SO_4 solution significantly move to the right after hydrogen charging. The solution treatment after hydrogen charging also has obvious intergranular corrosion tendency.