一、前言人们喜欢用电镀镉层作为保护飞机钢结构件的方法已经许多年了.在使用高强度钢和铝合金以前,采用镀镉没有多少明显的问题.但是,高强度钢电镀镉常常引起氢脆,高强度铝合金结构使用的镀镉紧固件促进埋头孔的剥落腐蚀.最近镀镉遭到进一步冷遇,是因为发现它引起钛结构的脆化,以及由于它的毒性和对环境的有害影响.六十年代初,麦克唐纳飞机公司(MC- I. INTRODUCTION People prefer to use cadmium plating as a method of protecting aircraft steel structures for many years. There are not many obvious problems with cadmium plating before the use of high strength steels and aluminum alloys. However, cadmium plating from high strength steels often causes Cadmium-plated fasteners for hydrogen embrittlement and high-strength aluminum alloys promote exfoliation corrosion of countersinks. Cadmium has recently been further cooled by the discovery that it causes embrittlement of the titanium structure and, due to its toxicity and environmental impact In the early 1960s, the McDonnell Aircraft Corporation (MC-