Abstract
The objective of this study was to form a polycrystalline oxide film on an Al substrate in electrolytic solutions of sodium phosphate using micro-arc-technology, and to consider a mechanism for the formation of the oxide film by type of sodium phosphate. Micro-arc on the Al substrate did not occur in electrolytic solutions of Na3PO4, Na2HPO4 or NaH2PO4, which were mono-sodium phosphate, preventing micro-arc-processing. However, micro-arc-processing was possible on the Al substrate and crystalline Al2O3 films were formed in electrolytic solutions of Na4P2O7 and Na5P3O10, which were poly phosphoric acid. Micro-arc may not have occurred in the mono-phosphoric acid electrolytic solutions because the resistance value of phosphoric acid radical impurities barrier layer is small in comparison with poly phosphoric acid sodium.
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