Effect of silicate-based films on the corrosion behavior of the API 5L X80 pipeline steel

• DOI: 10.1016/j.corsci.2018.04.035
• Publication Date: 2018-04-30T09:29:45Z
• Authors: Leandro Antonio d...; Olandir Vercino C...; Demetrio Jackson ...; Alejandro Andrés ...; Mara Cristina Lop...; Renato Altobelli ...
• Keywords: 0202 electrical engineering, electronic engineering, information engineering; 02 engineering and technology; 0210 nano-technology; 7. Clean energy

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.