Corrosion behaviour of oil well casing steel in H₂S saturated NACE solution

Authors: X. M. Dong, Q. C. Tian, Q. A. Zhang

Source: Corrosion Engineering, Science and Technology

Publisher: Maney Publishing

Abstract:

The corrosion behaviour of oil well casing steel in H₂S saturated NACE solution (5 wt-%NaCl+0.5 wt-%CH₃COOH) was investigated by means of electrochemical methods, Xray photoelectron spectroscopy and scanning electron microscopy. It was found that the investigated oil well casing steel can react with hydrogen sulphide in the H₂S saturated NACE solution at 25°C. During the reaction, corrosion films of mackinawite (FeS) form on the steel surface and the hydrogen atoms diffuse into steel matrix. The further corrosion of iron with H₂S can be retarded, and hydrogen permeation flux decreased, by the presence of the mackinawite film, which acts as a protective barrier provided it remains intact.

Document Type:

DOI: 10.1179/147842208X388753

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