The Effects of Cr/Mo Micro-Alloying on the Corrosion Behavior of Carbon Steel in CO2-Saturated (Sweet) Brine under Hydrodynamic Control. Issue 5 (7th April 2018)

• Record Type: Journal Article
• Authors: Sk, M. Hassan; Abdullah, A. M.; Qi, J.; Ko, M.; Ingham, B.; Laycock, N.; Ryan, M. P.; Williams, D. E.
• Is Part Of: Journal of the Electrochemical Society. Volume 165:Issue 5(2018)
• Page Start: C278
• Page End: C288
• Publication Date: 2018-04-07
• Subjects: CO2 corrosion -- microalloying -- siderite; Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/2.1011805jes
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : The effects of micro-alloying of plain carbon steel with Cr and Mo on the corrosion behavior in CO2 -saturated (sweet) brine (0.5 M NaCl, pH 6.6) environment, under hydrodynamic conditions, at 80°C were investigated. Crystalline siderite/chukanovite scales formed on all the alloys. Analysis of potentiostatic current transient data suggest that there exists a synergistic interaction between Cr and Mo, which induces more rapid crystallization of the scale compared to Mo-free steels. Increasing the Mo content also suppressed the transport-dependent dissolution current passing through the initially-present amorphous surface film. TEM images of the FIB-sectioned corrosion scales confirm that the corrosion scale formed on 1Cr0.7Mo is comparatively thinner and yet offers greater protectiveness when compared to the plain carbon steel.