O PROCESSO DE ANODIZAÇÃO DO ALUMÍNIO E SUAS LIGAS: UMA ABORDAGEM HISTÓRICA E ELETROQUÍMICA

THE ANODIZING PROCESS OF ALUMINUM AND ITS ALLOYS: A HISTORICAL ELECTROCHEMICAL APPROACH. Al and its alloys are found in several industrial applications. However, like most metals, this material is not immune to corrosion, being necessary be protected against corrosion. One of the methods commonly employed improve corrosion resistance anodizing process, which consists thickening natural oxide (Al2O3) presents through anodic oxidation. The process accomplished by immersion alloy into an acid bath passing electric current it. This produces two layers: a barrier layer thicker than with regular arrangement nanopores (porous layer). duplex structure forms anodized large specific surface area. With advent nanotechnology, has been applied other areas due low cost, stability, absence toxicity, biocompatibility. In context, paper addresses historical electrochemical review alloys, presenting main events that culminated development processes understanding relationship between chemical reactions mechanisms occur during nucleation