CHARACTERISTICS OF CO2 CORROSION SCALES ON 1%Cr-CONTAINING N80 STEEL

J Chin Soc Corr Pro

2003, Vol. 23

Issue (6): 330-334 DOI:

Research Report

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CHARACTERISTICS OF CO2 CORROSION SCALES ON 1%Cr-CONTAINING N80 STEEL

Changfeng Chen;Minxv Lu;Guoxian Zhao

北京科技大学材料科学与工程学院

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Abstract While simulating the CO2 corrosion environment in oilfield,the characteristics of CO2 corrosion scales on 1%Cr-containing N80 s teel were studied.The results demonstrated that Cr could be enriched in corrosio n scales forming amorphous compound Cr(OH)3 and the corrosion scale is compose d of Cr(OH)3 and FeCO3 crystals,that make the corrosion scale has the charac ter of cation-selectivity and as a result the anodic reactions could be suppress ed and corrosion rate be reduced.However anions in corrosion electrolyte still c an penetrate the FeCO3 crystal and get to the interface between matrix and cor rosion scale,which can lead to formation of pitting.

Key words: CO2 corrosion corrosion scales N80 steel pitting cor rosion

Received: 14 May 2002

ZTFLH:

TG174

Corresponding Authors: Changfeng Chen

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Changfeng Chen; Minxv Lu; Guoxian Zhao. CHARACTERISTICS OF CO2 CORROSION SCALES ON 1%Cr-CONTAINING N80 STEEL. J Chin Soc Corr Pro, 2003, 23(6): 330-334 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2003/V23/I6/330

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