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

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

[Display omitted] •Silicate-based films were obtained on API 5L X80 pipeline steel.•Silicon was present mainly as SiO2 on the anodic treatment film.•Corrosion resistance depends on the silica concentration in the fil.•Anodic treatment provided superior corrosion resistance. The aim of this work was...

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Bibliographic Details
Published in:Corrosion science Vol. 139; pp. 21 - 34
Main Authors: de Oliveira, Leandro Antonio, Correa, Olandir Vercino, dos Santos, Demetrio Jackson, Páez, Alejandro Andrés Zúñiga, de Oliveira, Mara Cristina Lopes, Antunes, Renato Altobelli
Format: Journal Article
Language:English
Published: Amsterdam Elsevier Ltd 15-07-2018
Elsevier BV
Subjects:
Adhesion tests
Adhesive strength
Anodic protection
API 5L X80
Bicarbonates
Chemical composition
Corrosion
Corrosion effects
Corrosion mechanisms
Corrosion prevention
Corrosion resistance
Electrochemical impedance spectroscopy
Electrode polarization
High strength low alloy steels
Morphology
Organic chemistry
Pipeline steel
Protective coatings
Pull off tests
Scanning electron microscopy
Sodium silicate films
Sodium silicates
Spectroscopic analysis
Spectrum analysis
Steel
Submerging
XPS
API 5L X80
XPS
Corrosion
Pipeline steel
Sodium silicate films
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Summary:[Display omitted] •Silicate-based films were obtained on API 5L X80 pipeline steel.•Silicon was present mainly as SiO2 on the anodic treatment film.•Corrosion resistance depends on the silica concentration in the fil.•Anodic treatment provided superior corrosion resistance. 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.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2018.04.035