飞机上很多零件采用高强度钢,而且表面采用镀镉来防锈。但由于镀镉工艺的副反应生成了大量氢,氢渗入镀层和基体而给零件带来氢脆性,降低了材料的强度,由于渗氢还会使镉层产生针孔、裂纹和起皮等缺陷,又降低了防锈性能。事实上,在镀镉工艺中,除镀镉工序本身外,其它很多工序也都与渗氢密切相关。现已证实,在镀前的脱脂和腐蚀时,氢就有可能渗到钢中,并在钢表面层中积聚,导致内应力和 Many parts of the aircraft using high-strength steel, and the surface with cadmium rust. However, due to the side reaction of cadmium plating process, a large amount of hydrogen and hydrogen are infiltrated into the plating and matrix to bring hydrogen embrittlement to the parts and reduce the strength of the material. Hydrogen permeation also causes defects such as pinholes, cracks and peeling from the cadmium layer , But also reduces the rust performance. In fact, in the cadmium plating process, in addition to cadmium plating process itself, many other processes are also closely related to the infiltration of hydrogen. It has been confirmed that during degreasing and corrosion before plating, it is possible for hydrogen to infiltrate the steel and accumulate in the steel surface layer, resulting in an increase in internal stress and