TITLE:
Effects of Anodizing Parameters in Tartaric-Sulphuric Acid on Coating Thickness and Corrosion Resistance of Al 2024 T3 Alloy
AUTHORS:
Mohammad Zaki Mubarok, Wahab, Sutarno, Soleh Wahyudi
KEYWORDS:
Aluminium Alloy, Anodizing, TSA, Corrosion, Polarisation, Pitting
JOURNAL NAME:
Journal of Minerals and Materials Characterization and Engineering,
Vol.3 No.3,
May
4,
2015
ABSTRACT: 2024 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.