Thermally sprayed Al/Mo coatings on industrial steel E335 and effects on electrochemical parameters in simulated acid rain

Thermal spraying was used to achieve bilayer Al/Mo coatings on E335 steel. The microstructure and chemical composition of the coatings were examined by SEM-EDS and XRD. The corrosion behaviours of bare and Al/Mo coated E335 steel were studied, in simulated rain solutions (pH 3.5, 4.5 and 5.5), by me...

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Bibliographic Details
Published in:Journal of alloys and compounds 2017-03, Vol.696, p.1282-1291
Main Authors: Ahnia, F., Khelfaoui, Y., Zaid, B., Pérez, F.J., Miroud, D., Si Ahmed, A., Alcalá, G.
Format: Article
Language:English
Subjects:
Acid rain
Chemical composition
Coating effects
Corrosion
Corrosion resistant steels
E335 steel
EIS
Electrochemical impedance spectroscopy
Engineering Sciences
Micro and nanotechnologies
Microelectronics
Microstructure
Molybdenum
Molybdenum/aluminum coatings
Protective coatings
Spraying
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Summary:Thermal spraying was used to achieve bilayer Al/Mo coatings on E335 steel. The microstructure and chemical composition of the coatings were examined by SEM-EDS and XRD. The corrosion behaviours of bare and Al/Mo coated E335 steel were studied, in simulated rain solutions (pH 3.5, 4.5 and 5.5), by means of potentiodynamic polarization, electrochemical impedance spectroscopy and dissolution tests. All these techniques concur in showing that Al/Mo coating enhances the corrosion resistance of the steel in acid rains. The characterization of the microstructure indicates that this improvement can be partly attributed to the good adhesion of Al on Mo. •Uncoated E355 steel has a low corrosion resistance in SAR solutions.•Al/Mo coating reduces drastically the dissolution of Fe by acting as effective barrier.•The protective effectiveness H is greater than 99% for solutions of pH 4.5 and 5.5.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2016.12.095