Effect of silicate-based films on the corrosion behavior of the API 5L X80 pipeline steel
0202 electrical engineering, electronic engineering, information engineering
02 engineering and technology
DOI:
10.1016/j.corsci.2018.04.035
Publication Date:
2018-04-30T09:29:45Z
AUTHORS (6)
ABSTRACT
Abstract The aim of this work was to investigate the effect of silicate-based films on the corrosion resistance of the API 5L X80 steel in carbonate-bicarbonate solution at room temperature. The films were electrochemically obtained by anodic and cathodic treatments and by immersion in 1.0 M sodium metasilicate solution. The corrosion behavior was evaluated using electrochemical impedance spectroscopy and potentiodynamic polarization. Film morphology was examined by scanning electron microscopy. Adhesion strength was measured by pull-off tests. The chemical composition was evaluated by X-ray photoelectron spectroscopy. The anodic film yielded the best corrosion resistance (protection efficiency 83%). The protection mechanism is discussed.
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