期刊
CORROSION SCIENCE
卷 51, 期 12, 页码 2897-2905出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2009.08.004
关键词
Aluminium; SEM; XRD; Anodic films; Oxide coatings
资金
- Engineering and Physical Sciences Research Council (UK)
- Engineering and Physical Sciences Research Council [EP/D029201/1] Funding Source: researchfish
The influence of an anodizing pre-treatment in sulphuric acid is investigated on plasma electrolytic oxidation (PEO) of aluminium in silicate electrolyte under constant rms current. The presence of the anodic film is shown to promote the establishment of a micro-arc regime that is favourable for growth of the PEO coating. The incorporation of the pre-formed film into the coating appears to proceed by thermal transformation of the anodic alumina, accompanied by formation of oxide beneath the pre-formed layer. The final coatings contain alpha- and gamma-Al2O3, with increased concentrations of silicon, sodium and potassium in an outer region of the coating. (C) 2009 Elsevier Ltd. All rights reserved.
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