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对由镀层和基体金属组成的复层体系的渗氢行为进行理论分析,导出渗氢电流关系式。依实际条件的不同,渗氢暂态分为升起暂态和衰降暂态。导出的公式表明,利用单一条渗氢电流曲线有可能同时确定氢在镀层和基体中的扩散系数D1和D2。单面镀镍的铜片上的渗氢测定结果证明,由升起暂态和衰降暂态分别得到的一组D1和D2值基本一致。文中对复层和单层体系的渗氢卑流公式进行比较,指出单层金属上渗氢阻挡层的存在对渗氢暂态的影响。
The hydrogen permeation behavior of the multi-layer system composed of the coating and the base metal is theoretically analyzed, and the relation of the hydrogen permeation current is deduced. Depending on the actual conditions, the transient hydrogen permeability is divided into rising transient and decay transient. The derived formula shows that it is possible to simultaneously determine the diffusion coefficients D1 and D2 of hydrogen in the coating and the matrix using a single hydrogen permeation current curve. Hydrogen permeation measurements on single-sided nickel-plated copper sheets demonstrate that a set of D1 and D2 values, respectively, obtained by rising transients and decay transients are nearly identical. In this paper, we compare the seepage hydrogen flow equations of the multi-layer and single-layer systems, and point out the influence of the presence of the hydrogen permeable layer on the hydrogen permeation transient of the single layer metal.