Corrosion and wear of PEO coated AZ91/SiC composites

In this work, corrosion and wear resistance of uncoated and PEO coated AZ91/SiC/0-10p composites manufactured by semisolid processing is evaluated by corrosion tests in saline solution and ball-on-disc tests. AZ91/SiC composites show a globular microstructure with SiC clusters located at the intergl...

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Bibliographic Details
Published inSurface & coatings technology Vol. 309; pp. 1023 - 1032
Main Authors Mingo, B., Arrabal, R., Mohedano, M., Pardo, A., Matykina, E.
Format Journal Article
LanguageEnglish
Published Lausanne Elsevier B.V 15.01.2017
Elsevier BV
Subjects
Beta phase
Clusters
Coating effects
Composite materials
Concentration (composition)
Corrosion
Corrosion rate
Corrosion resistance
Corrosion tests
Corrosive wear
Effects
Magnesium composite
Microstructure
Particulate composites
Protective coatings
Reinforcement
Semi-solid processing
SKPFM
Tribology
Wear
Wear resistance
Magnesium composite
SKPFM
Corrosion
Wear
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Summary:In this work, corrosion and wear resistance of uncoated and PEO coated AZ91/SiC/0-10p composites manufactured by semisolid processing is evaluated by corrosion tests in saline solution and ball-on-disc tests. AZ91/SiC composites show a globular microstructure with SiC clusters located at the interglobular regions. PEO coatings reveal a trilayered structure with thicker, less porous and softer regions at the locations of SiC clusters. Corrosion rate increases with increasing the volume fraction of reinforcement, which shows a cathodic activity and disrupts the continuity of the β-phase network. PEO improves the corrosion resistance, but it is also negatively influenced by the presence of the reinforcement. Tribological tests show a positive effect of the reinforcement on uncoated materials, whereas an opposite effect is found on PEO coated materials, probably due to the detachment of SiC particles from the coating. •AZ91/SiC/0-10p corrosion rate increases with the volume fraction of reinforcement.•PEO coatings improve corrosion resistance of AZ91/SiC/0-10p composites.•PEO coatings corrosion rate increases with the volume fraction of SiC.•Wear resistance increases with SiC content in non-coated materials.•Wear behaviour of PEO coated materials is negatively influenced by SiC clusters.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2016.10.041