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Internal corrosion of wet gas pipelines usually occurs in thin layers of water condensate with dissolved gases such as CO 2 , where a bacterial community can grow to cause microbiological corrosion. In this work, surface films generated during corrosion of an X52 pipeline steel under a CO 2 -containing thin electrolyte layer (TEL) in the absence and presence of  Desulfovibrio vulgaris  bacteria were characterised by atomic force microscopy. The film generated in the  Desulfovibrio vulgaris -containing TEL, i.e. a mixture of FeS, FeCO 3  and biopolymers, as compared with the film generated in the sterile TEL (i.e. FeCO 3 -dominant corrosion products), is topographically less compact and softer, with a reduced elastic modulus. After 7 days of immersion, the elastic modulus of the surface films generated in the sterile and  D. vulgaris -containing TELs are 11.81 and 6.79 GPa, respectively.

corrosion engineering, science and technology

Topographical profiles and mechanical property of corrosion product films on a pipeline steel in  Desulfovibrio vulgaris -containing thin electrolyte layer characterised by atomic force microscopy