Effect of Sn Addition on the Corrosion Performance of Cast X-52 in H2S-containing Environment at 60℃
The electrochemical behavior of cast X-52 with different Sn content ranging from 0 to 1 wt.% was investigated using the methods of potentiodynamic test,electrochemical impedance spectroscopy (EIS).The immersion tests involved to examine the relationship between Sn addition and corrosion performance of cast X-52.In addition,the morphology and the compositions of surface corrosion products were analyzed using scanning electron microscope (SEM)/ energy dispersive spectroscopy (EDS).Potentiodynamic polarization curves showed that the presence of Sn decreased the corrosion current density.EIS indicated that Sn-containing steels had higher polarization resistances.These results confirmed that Sn played a positive role in reducing corrosion rate in H2S-containing environment.However,the corrosion resistance decreased with increasing Sn addition.It was proved that Sn improved the corrosion resistance with only a small content and large amount of Sn might lead to an advance of the pit due to occurrence of more acidification.Moreover,a continuous inner O-rich layer adherent to the matrix was found for Sn-addition samples,which lead to a decrease of corrosion rate due to its compact characteristic,compared with porous sulfide formed on the outer surface.
Cast X-52 Sn addition H2S O-rich products O-rich layer
Hongliang Lin Jianqiu Wang Enhou Han
State Key Laboratory of Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, China
国际会议
the Chinese Materials Congress 2012(2012年中国材料大会(CMC2012))
太原
英文
607-612
2012-07-13（万方平台首次上网日期，不代表论文的发表时间）