|Autors: Aroyo M., Tzaneva, B. R., Tzonev N.|
Title: Formation of Anodic Aluminum Oxyde Coating with Excellent Corrosion Resistance by the Application of (DC + AC) Bi-polar Pulses
Keywords: Aluminum anodizing, pulse reverse waveforms, hexavalent chromate alternatives
Abstract: The goal of the present paper is to prove the benefits of the (DC+AC) pulse reverse technique toward developing an environmentally-friendly technology for pre-paint treatment of aluminum and its alloys. This technique permits us to obtain anodic films that would present a better alternative to unsealed sulfuric and chromic acid anodized coatings. The method is based on aluminum anodizing in sulfuric/boric acid solution by the application of (DC+AC) bi-polar pulses. Due to the AC-component of the pulse current, both processes - of pore formation and of electrolytic deposition of the corrosion inhibiting substance (CIS) at the pore base of the anodic coating - are promoted. As a result the anodic oxide coatings filled with CIS provide an extremely high pitting corrosion resistance, several times greater than that of the anodic films formed at present time in sulfuric/boric acid, chromic acid or other anodizing electrolytes and technologies.
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