local corrosion

例句：

1. 1. The local corrosion of themetal is due to the presence of impurities in the alloy.
   金属的局部腐蚀是由于合金中存在杂质造成的。
2. 2. Thelocal corrosion of the steel pipeis a common problem in water supply systems.
   钢管的局部腐蚀是供水系统中常见的问题。
3. 3.The local corrosion of the metalcan be prevented by using a protective coating.
   通过使用防护涂层可以防止金属的局部腐蚀。