At present, direct and efficient detection methods are always lacking when it comes to the tie-in place of welding line in the metal structures, liquid hide area of dead angle of industrial facility container and some corrosion sensitive segments such as bolt and screw. 目前,对容易遭受腐蚀的金属设备构筑物的焊缝接头处、工业设备容器的死角液体滞流区、螺栓螺纹等腐蚀敏感部位往往缺乏直接有效的检测手段。