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- Title
Optimization of galvanostatic micro-arc oxidation on eutectic Al-Si alloy.
- Authors
LI Kang; ZHU Wen; YI Aihua; LIAO Zhongmiao; LI Wenfang; CHEN Ken; YE Yun; HONG Chuzhang; YANG Yan
- Abstract
The eutectic Al-Si binary alloy was treated by micro-arc oxidation (MAO) galvanostatically in an alkaline electrolyte. The MAO process parameters were optimized based on orthogonal test with the mass concentrations of Na2SiO3 and C6H12N4 (methenamine), current density, pulse frequency, and duty cycle as the factors by evaluating the corrosion resistance and growth rate of MAO film as well as the specific energy consumption during MAO. The optimal composition of the electrolyte is Na2SiO3 12 g/L, NaOH 2 g/L, and C6H12N4 5 g/L, and the optimal process conditions are: positive current density 10 A/dm², negative current density 4 A/dm², pulse frequency 400 Hz, duty cycle 25%, and positive-to-negative pulse number in a period 1. This process greatly reduces the adverse effect of Si on the MAO of eutectic Al-Si alloy.
- Publication
Electroplating & Finishing, 2021, Vol 40, Issue 5, p380
- ISSN
1004-227X
- Publication type
Article
- DOI
10.19289/j.1004-227x.2021.05.012