南海榆林海域环境因素对钢局部腐蚀的影响  

INFLUENCE OF ENVIRONMENTAL FACTORS IN YULIN AREA OF THE SOUTH CHINA SEA ON LOCALIZED CORROSION OF STEELS

作　　者：刘大扬[1] 魏开金[1] 李文军[1] 曹付炎[1] 

机构地区：[1]洛阳船舶材料研究所,洛阳471039

出　　处：《中国腐蚀与防护学报》2003年第4期211-216,共6页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金重大项目 (5 989914 0 )

摘　　要：采用典型钢宏观海生物实海验证腐蚀试验 ,测试分析钢样锈层中主要腐蚀细菌、FeS和钙盐沉淀物 .结果表明 ,由于南海榆林海域水温较高 ,海生物一年四季生长旺盛 ,在钢样表面呈不均匀附着 ,使钢样表面电化学不均匀性增大 ;榆林站钢样锈层中几种好氧菌及厌氧的硫酸盐还原菌比温度较低的青岛站的高几倍至 3个数量级 ,并呈聚集分布 ;几种钢样腐蚀产物中的FeS含量榆林比青岛高 0 1～ 1倍左右 ,南海榆林海域细菌局部腐蚀效应较大 ,这是加剧钢的局部腐蚀的两个重要因素 .The severe localized corrosion of steels in Yulin area of the South China Sea was analyzed by the use of macroscopic testing of seawater corrosion of typical steels induced by marine organisms,testing of major corrosive bacteria and FeS in the rust layer on steel specimens and testing of calcium deposits in the rust layer on steel specimens.The results reveal that the marine organisms grow vigorously all year round due to rather high temperature of seawater in this area and result in uneven fouling to the surface of steel specimens,which increases the electrochemical heterogeneity of the surface of steel specimens,the amounts of several aerobic bacteria and anaerobic SRB in the rust layer on steel specimens exposed in Yulin testing station are several times to three orders of magnitude larger than those on steel specimens exposed in Qingdao testing station,where the temperature of seawater is lower,and show collective distribution;the content of FeS in the corrosion product on steel specimens exposed in Yulin testing station is 0.1 times to twice higher than that of steel specimens exposed in Qingdao testing station.High Content of FeS and severe localized corrosion induced by bacteria are two important factors for aggravation of localized corrosion of steels in Yulin area of the South China Sea.

关 键 词：钢 海洋环境 局部腐蚀 

分 类 号：TG172.5[金属学及工艺—金属表面处理]