全金属客车和保温车的地板内表面及车体墙板下部内表面易受强烈腐蚀。经过5～6年的使用,保温车波纹地板内表面局部腐蚀损坏,继续使用时,这种损坏便扩大并导致穿孔。类似的情况在客车上也有,特别是在易受腐蚀的厕所、锅炉房、通过台等处。 The inner surface of the floor of the whole metal bus and the insulation car and the inner surface of the lower part of the car body wallboard are vulnerable to strong corrosion. After 5 to 6 years of use, the inner surface of the corrugated floor insulation car corrosion damage, continue to use, this damage will expand and lead to perforation. A similar situation is also found in passenger cars, especially in toilets, boiler rooms, tramways, etc. that are subject to corrosion.