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作为膨胀节用的不锈钢波纹管用在地下管道中，若与污水或污泥接触，由于Ｃｌ－含量较高，会产生腐蚀，阴极保护是简便可行的防止腐蚀的方法之一。
Stainless steel bellows used as expansion joints are used in underground pipelines. When contacted with sewage or sludge, corrosion will occur due to the high Cl- content. Cathodic protection is a simple and feasible method to prevent corrosion.