MoO_4^(2-)对2205双相不锈钢氢脆敏感性的影响

Effect of Molybdate Ion on Hydrogen Embrittlement of 2205 Duplex Stainless Steel

采用电化学阻抗谱研究了钼酸盐在双相不锈钢表面的吸附行为,进而研究钼酸盐对2205双相不锈钢氢渗透行为的影响。结果表明,MoO42-通过吸附,在试样表面形成一层表面阻挡膜;Mo O42-能够抑制H原子在双相不锈钢表面的吸附,降低表面的H数量以及氢的浓度梯度,使H原子在双相不锈钢中的扩散驱动力减小,降低氢原子在双相不锈钢中的扩散速率和双相不锈钢的氢脆敏感性。

In this paper, electrochemical impedance has been used to investigate the adsorption of MoO42- on the surface of 2205 duplex stainless steel （DSS）, and further, the effect of MoO42- on hy- drogen permeation behavior of DSS has been investigated. The results revealed that molybdate ion formed a film on the steel surface by adsorption, which could act as a barrier for the adsorption of H atom, thereby, the hydrogen diffusion rate was declined; the susceptibility to hydrogen embrittle- ment of 2205 DSS in sodium chloride solution was decreased by the presence of molybdate ion.