Effect of Sn Addition on the Corrosion Performance of Cast X-52 in H2S-Containing Environment at 60°C

Hong Liang Lin; Jian Qiu Wang; En-Hou Han

doi:10.4028/www.scientific.net/MSF.743-744.607

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HomeMaterials Science ForumMaterials Science Forum Vols. 743-744Effect of Sn Addition on the Corrosion Performance...

Effect of Sn Addition on the Corrosion Performance of Cast X-52 in H₂S-Containing Environment at 60°C

Abstract:

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.

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Periodical:

Materials Science Forum (Volumes 743-744)

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607-612

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https://doi.org/10.4028/www.scientific.net/MSF.743-744.607

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Online since:

January 2013

Authors:

Hong Liang Lin, Jian Qiu Wang, En-Hou Han

Keywords:

Cast X-52, H₂S, O-Rich Layer, O-Rich Products, Sn Addition

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