Anodizing of multiphase aluminium alloys in sulfuric acid: in-situ electrochemical behaviour and oxide properties

A study on corrosion‐fatigue behavior of AA7075‐T651 subjected to different surface modification treatments

“…Anodizing is a conventional way to protect materials from corrosion. The elevated abrasion resistance and paint adhesion, the increase in adhesive bonding, and the capability to offer electrical insulation are among the extra advantages that stem from anodizing . Because of its compact internal layer, the anodic aluminum oxide layer adheres nicely with the substrate layer, which is proved to be useful for the corrosion protection.…”

“…Despite that fact, the porous outer layer is brittle and can cause the effortless formation and propagation of cracks into the substrate. Therefore, the fatigue strength of the metal can dramatically be reduced …”

“…The elevated abrasion resistance and paint adhesion, the increase in adhesive bonding, and the capability to offer electrical insulation are among the extra advantages that stem from anodizing. 4,5 Because of its compact internal layer, the anodic aluminum oxide layer adheres nicely with the substrate layer, which is proved to be useful for the corrosion protection. Despite that fact, the porous outer layer is brittle and can cause the effortless formation and propagation of cracks into the substrate.…”

“…Therefore, the fatigue strength of the metal can dramatically be reduced. [5][6][7] Micro-arc deposition of ceramic coatings, plasma electrolytic oxidation (PEO), and hard anodized ceramic coatings have been used in the past on light materials (including aluminum alloys) to enhance tribological properties and improve corrosion resistance. During the last decade, it has been shown that by using appropriate sealing processes and better quality of coatings surfaces, these hard oxides do not deteriorate the fatigue durability of aluminum Nomenclature: AA, Aluminum Alloy; EDM, Electrical Discharge Machining; FEM, Finite Element Method; MAO, Microarc Oxidation; OCP, Open Circuit Potential; PEO, Plasma Electrolytic Oxidation; SCE, Saturated Calomel Electrode alloys.…”

The influence of the conditions of microplasma processing (microarc oxidation in anode­cathode regime) of aluminum alloys on their phase composition

“…The electrolytes used are alkaline [20], so they are environmentally safer than chromium or sulfuric acid, which are commonly used in the anodizing process [21]. Microarc oxidation allows obtaining multifunctional ceramic-like modified layers with a wide range of properties, including wear-resistant [22], corrosion-resistant [23], heat-resistant [24], electrical insulating, and decorative [25].…”