Journal
SURFACE & COATINGS TECHNOLOGY
Volume 304, Issue -, Pages 85-97Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2016.07.003
Keywords
Aluminum alloy; Second phase particle; Oxide coating; Micro-arc oxidation
Funding
- Key Lab of Nonferrous Metal Materials Science and Engineering of Ministry of Education at Central South University [201510533029]
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SEM and EDS analysis, immersion and electrochemical tests were performed to evaluate the effect of friction stirring process induced Al-Fe-Si particles in 6061 aluminum alloy on structure and corrosion performance of micro arc oxidation (MAO) coatings on different regions of the friction stirred plate. The results show that coarse and congregated Al-Fe-Si particles in the base material (BM) and in the thermomechanical affected and heat affected zone (TM-HAZ) lead to formation of large and connected micro voids at interface of MAO coating/substrate and discontinuous inner oxide film. The structure and the corrosion protection performance of the MAO coating can be improved by inducing these coarse and congregated Al-Fe-Si particles into fine and disperse distributed particles as that in the stirred nugget zone (NZ) through the friction stirring process. (C) 2016 Elsevier B.V. All rights reserved.
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