缝隙腐蚀是在构件缝隙处(如法兰连接处、管和管板胀接处、螺栓或铆钉连接表面和沉积物下等),由于电解质的滞流形成某种电化学电池引起的局部腐蚀现象.易钝化的金属材料,如不锈钢、铝.镍和钛等在一定条件下都有缝隙腐蚀倾向,例如,海洋船上供水铝管与胶管的连接处的腐蚀就是一种典型的铝的缝隙腐蚀现象.自从1956年Schlmin首次提出钛存在缝隙腐败蚀问题以 Crevice corrosion is the phenomenon of localized corrosion caused by the formation of some sort of electrochemical cell due to the stagnation of the electrolyte, at the crevices of the components (such as the flange connection, the joint of the pipe and the pipe plate, the bottom of the bolt or rivet connection surface and deposits, etc.) Easily passivated metallic materials such as stainless steel, aluminum, nickel and titanium have a crevice corrosion tendency under certain conditions. For example, the corrosion of the connection between the water supply aluminum pipe and the hose on the marine vessel is a typical aluminum crevice corrosion Phenomenon. Since 1956 Schlmin first proposed the existence of titanium corrosion crevice corrosion problem