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The review summarises the results of EIS analysis of sulphide films formed on steel during hydrogen sulphide and microbiologically induced corrosion, as well as inhibition of these processes. The issues of the effectiveness of anticorrosive protection of pipeline systems, the possibility of chemical modelling of biocorrosion activity of media, identifying the contribution of corrosion inhibitors to the barrier action of surface films on the corroded steel are considered as well. The information presented in the review will be of interest to employees of the anti-corrosion protection services of oil and gas producing and transporting companies.

The protective effect of amines on steel corrosion under simulated conditions of gas condensate fields are studied. It is shown that primary amines are less effective than secondary and tertiary ones in terms of steel protection, especially in vapor phase. The authors also studied the impact of 2 HS C , pH, temperature and presence of a hydrocarbon phase on protective effect of chemical compounds considered.

This paper offers a modification of a method for separate estimation of the contributions of corrosion products and inhibitor films to the total protective effect. The method is based on the consideration of changes in thickness of the corrosion product film due to the inhibitor effect and film dissolution. A comparison of the original and modified methods is based on experimental results.

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