摘要
运用电化学渗透技术研究了不同充氢电流密度下304不锈钢的氢扩散现象。结果表明,随着阴极充氢电流密度的增大,阳极饱和电流密度增大,进入试样内的氢含量也愈大,而氢的表观扩散系数略有减小。其原因是表面氢含量增加,氢原子之间存在交互作用,从而阻碍了氢的扩散。通过测定充氢-放氢渗氢曲线,得到了该试样的不可逆陷阱密度。
The electrochemical permeation technique was applied to study the diffusion phenomena of hydrogen in 304 stainless steel. The experimental results revealed that the apparent diffusion coefficient of hydrogen decreased with increasing charging current. This result suggested that the hydrogen diffusion was hindered by the increased hydrogen concentration beneath the surface because of the interaction of hydrogen atoms. The comparison of multiple charging - diseharging runs were performed and analyzed to determine the apparent diffusion coefficient and the density of irreversible traps.
出处
《石油化工腐蚀与防护》
CAS
2010年第4期15-16,20,共3页
Corrosion & Protection In Petrochemical Industry
基金
国家自然科学基金资助项目
编号为50875084
关键词
电化学渗透
表观扩散系数
氢陷阱
electrochemical permeation, apparent diffusion coefficient, hydrogen trap
