ELECTROCHEMICAL CHARACTERISTICS OF CO2 CORROSIONOF WELL TUBE STEELS WITH CORROSION SCALES

J Chin Soc Corr Pro

2003, Vol. 23

Issue (3): 139-143 DOI:

Research Report

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ELECTROCHEMICAL CHARACTERISTICS OF CO2 CORROSIONOF WELL TUBE STEELS WITH CORROSION SCALES

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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Changfeng Chen; Minxv Lu; Guoxian Zhao. ELECTROCHEMICAL CHARACTERISTICS OF CO2 CORROSIONOF WELL TUBE STEELS WITH CORROSION SCALES. J Chin Soc Corr Pro, 2003, 23(3): 139-143 .

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Abstract The potentiodynamic and electrochemical impedance t echniques were employed to study the electrochemical characteristics of CO2 co rrosion of two kinds of well tube steels with corrosion scales.The results showe d that after corrosion scale formed on well tube steels,corrosion curre nt density would decrease observably,the character of Warburg impedance could be found in electrochemical impedance spectra and the protection of corrosion scal e of Cr-containing well tube steel was better than N80 steel mainly because the porosity of Cr-containing well tube steel was lower then that of N80 steel.Becau se of the pitting electrode process of N80 steel,the capacitance loop would pres ent itself in EIS at low frequency range.

Key words: CO2 corrosion EIS potentiodynamic N80 steel Cr-conta ining well tube steel

Received: 27 August 2001

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