对两种成分的淬火态、回火态690 MPa级中锰钢进行双电解池电化学氢渗透试验，分析了试验钢的化学成分、热处理状态以及充氢电流等对氢扩散行为的影响。结果表明：两种淬火态试验钢的显微组织均主要由板条马氏体组成，650℃回火后，试验钢中均有逆转变奥氏体形成，且添加合金元素铜、镍、铬的试验钢中的逆转变奥氏体含量较高，板条马氏体更细小；两种淬火态试验钢中氢的扩散行为差别不大，但在添加合金元素的回火态试验钢中，氢的渗透速率和表观扩散系数均较小，渗透时间较长；充氢电流对淬火态试验钢中氢的扩散速率影响较小，但对在回火态试验钢中氢的影响较大，随充氢电流的增加，试验钢中氢的渗透速率和表观扩散系数均增大，渗透时间变短。

Double electrolytic cell electrochemistry hydrogen permeation test was conducted on two grade 690 MPa medium Mn steels with different composition in queched state and tempered state. The effects of chemical composition and heat treatment condition of the tested steel, and hydrogen charging current on the hydrogen diffusion behavior were analyzed. The results show that the microstructures of two tested steels after quenching both consisted of lath martensite, and reverted austenite was observed after tempering at 650℃; the reverted austenite content of the tested steel adding alloying elements of Cu, N and Cr was higher and lath martensitic was finer. The difference of the hydrogen diffusion behavior of the two quenched tested steels was not obvious, but after tempering, the hydrogen permeation rate and hydrogen apparent diffusion coefficient in the tested steel added with alloying elements were both relatively small, and the hydrogen permeation time was relatively long. The hydrogen charging current had a little effect on the hydrogen permeation rate of the quenched tested steel, but had a great effect on the tempered tested steel. With the increase of hydrogen charging current, the hydrogen permeation rate and the hydrogen apparent diffusion coefficient of the tempered tested steel both increased, hydrogen permeation time shortened.