Effect of Sulfate Reduced Bacterium on Corrosion Behavior of 10CrMoAl Steel

The effects of sulfate reduced bacterium （SRB） on the corrosion behavior of 10CrMoAl steel in seawater were studied by chemical immersion, potentiodynamic polarization, electrochemical impedance spectroscopy measurement, and scanning electron microscope techniques. The results show that the content of element sulfur in the corrosion product of 10CrMoAl steel in seawater with SRB is up to 9. 23 %, which is higher than that of the same in sterile seawater. X-ray diffraction demonstrates that the main corrosion product is FeS. SRB increases the corrosion rate by anodic depolarization of the metabolized sulfide product. SEM observation indicates that the corrosion product is not distributed continuously; in addition, bacilliform sulfate-reduced bacterium accumulates on the local surface of 10CrMoAl steel. Hence, SRB enhances sensitivity to the localized corrosion of 10CrMoAl steel in seawater.

10CrMoAl钢的热处理

10CrMoAl钢是一种低合金结构钢,耐海水腐蚀,且具有良好的焊接性能,广泛用于泵和阀门的法兰等结构件。对10CrMoAl钢进行了不同温度的正火和正火加高温回火及淬火加高温回火处理,随后检测其显微组织和力学性能。结果表明,经970℃正火后630℃回火的10CrMoAl钢的显微组织为均匀细小的铁素体和回火索氏体,力学性能符合标准要求。

10CrMoAl钢和20号钢在秦山核电站厂区土壤环境中的腐蚀行为

通过海水输水管用10CrMoAl钢和淡水给水管用20号钢在秦山核电站厂区土壤环境中的腐蚀试验,分析了不同保护措施对两种钢的保护效果。结果表明:两种钢在秦山核电站厂区土壤环境中的腐蚀速率都很低,均发生不同程度的点蚀;涂层+阴极保护的方法对两种钢的保护效果最好。

海水循环水管道复合防护技术应用

针对舟山电厂海水循环冷却10CrMoA l钢管的腐蚀问题,提出采用水泥涂层外加电流进行联合保护的解决方案。通过实验室静态试验、现场模拟试验和流动海水模拟试验,测定各种参数,然后选取阴极保护参数。结果证明:这种复合保护方法是比较有效的。