Effect of CO2 Partial Pressure on the Morphology of Corrosion Metallic Product Scales

J Chin Soc Corr Pro

2004, Vol. 24

Issue (5): 284-288 DOI:

Research Report

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Effect of CO2 Partial Pressure on the Morphology of Corrosion Metallic Product Scales

Guanfa Lin

西安交通大学

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Abstract Simulated autoclave is employed to study the corrosion process of three kinds of oil well steels in CO2 environment with varying CO2 partial pressure. The effect of the CO2 partial pressure on the average scale thickness and crystal grain size of the scales is studied by using scanning electron microscope(SEM).The results show that, the cross-section of the corrosive product scales of the three kinds of steels are doublelayers in the structures, the variation of average scale thickness for the three kinds of steels with CO2 partial pressure is in the similar manner, of which the maximum average scale thickness appears at the CO2 partial pressure about 6.89MPa and then decreased rapidly. The variations of the average crystal grain size with CO2 partial pressure for the three steels exhibit two peaks and a valley in between; however the CO2 partial pressures corresponding to the peaks and valley and crystal grain sizes for different materials vary, and crystal grain sizes of the three steels with CO2 partial pressure decreased quickly beyond the peaks.

Key words: corrosive product scale CO2 corrosion CO2 pressure scale thickness grain size SEM

Received: 10 March 2003

ZTFLH:

TG172.82

Corresponding Authors: Guanfa Lin E-mail: lingf808@163.com

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Cite this article:

Guanfa Lin. Effect of CO2 Partial Pressure on the Morphology of Corrosion Metallic Product Scales. J Chin Soc Corr Pro, 2004, 24(5): 284-288 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2004/V24/I5/284

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