摘要
采用全浸泡腐蚀实验方法和扫描电子显微镜(SEM)、能谱仪(EDS)、X射线衍射仪(XRD)、失重法、极化曲线、交流阻抗等分析手段,对超级13Cr油管钢在不同温度NaCl溶液中的腐蚀速率、腐蚀形貌、腐蚀产物及其膜层的电性能进行了分析,研究了溶液温度对其膜层电性能和腐蚀行为的影响。结果显示:超级13Cr油管钢在温度低于80℃的NaCl溶液中具有较好的耐腐蚀性,其表面膜层具有钝化特性,温度对其腐蚀有一定程度的影响,随溶液温度的升高,钝化膜层对基体的保护作用降低,其抗腐蚀性能降低,发生腐蚀的倾向性增大,当溶液温度高于60℃时尤为显著。超级13Cr在不同温度NaCl溶液中由点蚀引发了局部腐蚀,进而导致了全面腐蚀的发生,其腐蚀产物均由Fe和Cr的氧化物组成,且表面的腐蚀产物疏松不致密。
The corrosion behaviors of super 13Cr tubing steels were investigated by immersion corrosion test in NaC1 solution from 20℃ to 80 ℃. The corrosion rate, corrosion morphologies, corrosion products and e lectric characteristics of surface films were analyzed by scanning electron microscopy （SEM）, energy disper sive analysis （EDS）, X-ray Diffraction （XRD）, weight loss, polarization and electrochemical impedance spectroscopy （EIS）. The results shows that super 13Cr tubing steels has better general corrosion resistance prop- erties in NaC1 solution under 80℃ , and the surface films has passive characteristics. The temperature of solu tion has influences on the corrosion of super 13Cr tubing steels in NaC1 solutions in a certain degree. With in- creasing temperature, the corrosion resistance properties of super 13Cr tubing steels decrease, while the tendency of corrosion increases. The protection properties of passive films decrease for the substrate, which are significant with the solution above 60 ℃. The localized corrosion of super 13Cr tubing steels is caused by pit ting in NaC1 solution at different temperatures, and then results in general corrosion. The corrosion products consist of Fe and Cr oxides, which are incompaet.
出处
《中国表面工程》
EI
CAS
CSCD
北大核心
2012年第5期73-78,共6页
China Surface Engineering
基金
陕西省科技计划项目(2011K07-01)
关键词
超级13Cr油管钢
NACL溶液
钝化特性
腐蚀
温度
super 13Cr tubing steels
NaG1 solution
passive characteristic
corrosion
temperature
