碳钢及低合金钢在海水中由局部腐蚀引起的危害较均匀腐蚀严重得多,因而研究海洋用钢产生局部腐蚀的原因及其防止方法已日益受到重视。钢在海水中产生局部腐蚀的因素较为复杂,有钢质内部的因素,如合金成份、夹杂物……也有环境条件的影响,如附着生物、泥沙及腐蚀产物等各种能使钢材表面透氧不均匀的因素。钢中硫化物夹杂最为常见,这是因为硫在钢中固溶度很小,当钢液凝固时,其中硫多以金属硫化物的形式沉淀出来。硫化物夹杂对钢材的大气腐蚀、酸腐蚀及应力腐蚀破 Carbon steel and low alloy steel in seawater caused by local corrosion damage is more serious than the uniform corrosion, and therefore the study of marine corrosion caused by local corrosion causes and prevention methods have received increasing attention. The factors that lead to local corrosion of steel in seawater are more complex. There are steel internal factors such as alloy composition and inclusions. There are also environmental influences such as attachment of organisms, sediment and corrosion products, Non-uniform oxygen factor. Sulfide inclusions in steel are the most common because of the small solubility of sulfur in the steel. When the molten steel is solidified, sulfur is mostly precipitated as metal sulfides. Sulfide inclusions on the steel atmospheric corrosion, acid corrosion and stress corrosion cracking