Influence of Cr Addition on Corrosion Behavior of Cast X52 Steel in Wet H2S Environment at 30 ℃

Journal of Chinese Society for Corrosion and protection

2013, Vol. 33

Issue (4): 283-287 DOI:

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Influence of Cr Addition on Corrosion Behavior of Cast X52 Steel in Wet H₂S Environment at 30 ℃

LIN Hongliang, WANG Jianqiu, HAN En-Hou

State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

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Abstract To elucidate the effect of Cr on the corrosion behavior of cast X52 steel in H₂S containing environments, potentiodynamic polarization tests, electrochemical impedance spectroscopy (EIS) measurements, immersion tests SEM and EDS analysis were conducted. The results show that Cr addition leads to a remarkable decrease in the cathodic current density. However, the corrosion resistant did not increase linearly with the increasing Cr content. The addition of Cr altered the corrosion morphology, whilst the formed oxide scale transformed gradually from porous to compact. SEM-EDS analysis revealed the presence of Cr-rich corrosion products in the inner portion of the formed oxide scale, which may be responsible to the distinct drop in corrosion rate.

Key words: cast X52 steel electrochemical corrosion Cr-rich oxide

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TG174.1

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LIN Hongliang,WANG Jianqiu,HAN En-Hou. Influence of Cr Addition on Corrosion Behavior of Cast X52 Steel in Wet H₂S Environment at 30 ℃. Journal of Chinese Society for Corrosion and protection, 2013, 33(4): 283-287.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2013/V33/I4/283

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