Effects of Anodizing Parameters in Tartaric-Sulphuric Acid on Coating Thickness and Corrosion Resistance of Al 2024 T3 Alloy

Abstract

Abstract2024 T3 is one of aluminium alloys which are widely used in the aircraft structures. Anodizing of alluminium alloy in tartaric-sulphuric acid (TSA) electrolyte is developed to obtain more environmentally-friendly process and to produce anodize layer with better corrosion resistance. In this research work, the influences of anodizing parameters of Al 2024 T3 in TSA on the thickness, weight and corrosion resistance of the anodize layer are studied. Corrosion resistance test was carried out by conducting salt spray test for 336 hours and anodic polarization measurements using potentiostat. Results of three-factor analysis of variance (ANOVA) demonstrated that the most influencing factor that determines the thickness and weight of the anodize layer is temperature, followed by applied voltage, duration of anodizing, voltage-temperature interaction, interaction of temperature-duration of anodizing, interaction of voltage-temperature-duration of anodizing, and interaction of voltage and duration of anodizing. The pit density and corrosion current density (icorr) were found to be dependent on the coating thickness. The anodize layer with a thickness of higher than 3 μm was not experienced to pitting corrosion during 336 hours of salt spray test.

Green Principles for Vehicle Lightweighting

“…116,117 For example, aircraft and marine applications of aluminum are common, but higher mechanical strength requirements compared to those of automotive applications necessitate the use of copper alloys, which reduce corrosion resistance. 118 Chromic acid anodizing of aluminum helps to reduce corrosion, but chromates are environmentally toxic, and this trade-off between strength, corrosion resistance, and the use of toxins must be evaluated. 118,119 Metrics, Tools, and Gaps in Practice.…”

“…118 Chromic acid anodizing of aluminum helps to reduce corrosion, but chromates are environmentally toxic, and this trade-off between strength, corrosion resistance, and the use of toxins must be evaluated. 118,119 Metrics, Tools, and Gaps in Practice. Metrics that can be used to assess progress on Principle 5 include the design life of the part, durability, and remanufacturability.…”

Novel anodic oxide film with self-sealing layer showing excellent corrosion resistance

“…The chlorine ions migration occurred once a critical anodic potential or critical adsorbed chloride ions concentration was reached. The chloride ions migrated from the liquid drop/AOFs interface into the passive AOFs, resulted in initiation of pitting corrosion 43 . With time goes by, the ingress of chlorine ions caused the surface dissolution and the pitting corrosion showed in Fig.…”

Crack growth study under thermo-mechanical loads: parametric analysis for 2024 T3 aluminum alloy

“…The corrosion resistance test was performed by running a salt spray test for 336 hours and anodic polarization measurements using a potentiostat. The results of showed that the most important factor in determining the thickness and weight of the anodized layer is the temperature, followed by the applied voltage, the voltage-temperature interaction, the temperature and the duration of the layer [6]. This study presents a tool for simulating the crack growth in thermo-mechanically loaded equipment.…”

“…Significantly, accompanied by a reduction in ductility. Mohammad Zaki [6] reveals the influences of anodizing parameters of Al 2024 T3 in TSA (Tartaric-Sulphuric Acid) on the thickness, the weight and corrosion resistance of the anodized layer are studied. The corrosion resistance test was performed by running a salt spray test for 336 hours and anodic polarization measurements using a potentiostat.…”