Corrosion of Magnesium-Aluminum Alloys with Al-11Si/SiC Thermal Spray Composite Coatings in Chloride Solution |
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Authors: | R Arrabal A Pardo M C Merino M Mohedano P Casajús and E Matykina |
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Affiliation: | (1) Departamento de Ciencia de Materiales, Facultad de Ciencias Qu?micas, Universidad Complutense, 28040 Madrid, Spain;(2) Centro Nacional de Investigaciones Metal?rgicas CSIC, Avda. Gregorio del Amo 8, 28040 Madrid, Spain |
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Abstract: | Depositions of Al-11Si coatings reinforced with 5, 15, and 30 vol.% SiC particles (SiCp) were performed onto AZ31, AZ80, and
AZ91D magnesium alloys. The influence of substrate composition and SiCp proportion on the anti-corrosion properties of composite
coatings was evaluated using DC and AC electrochemical measurements in 3.5 wt.% NaCl solution at 22 °C. The as-sprayed coatings
were permeable to the saline solution, and galvanic corrosion occurred at the substrate/coating interface after immersion
in the saline solution for a few hours. The addition of SiCp yielded coatings with higher porosity and less effectiveness
against corrosion. The application of a cold-pressing post-treatment produced denser coatings with reduced surface roughness,
improved hardness, and superior corrosion resistance. However, galvanic corrosion was observed after several days of immersion
because of penetration of the 3.5 wt.% NaCl solution through the remaining pores in the coatings. |
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