The reason of defect generation is local spotcorrosion due to contact with the corrosive medium in the transportation and storage.
产生缺陷的原因是运输、储存过程中与腐蚀性介质接触造成钢管局部点腐蚀。
2
The resistance to local corrosion by common austenitic stainless steel such as 304l and 316l in Cl-containing media is poor, and the frequently seen damage form is spotcorrosion.
通用的304l、316l等奥氏体不锈钢在含氯介质中的耐局部腐蚀性能较差，常见的破坏形态是点腐蚀。
3
After studying the situations of local and spotcorrosion to ship's hull and pipelines, the paper proposed the method to repair and strengthen the elements by using the composite materials.