Journal
SURFACE & COATINGS TECHNOLOGY
Volume 360, Issue -, Pages 369-375Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2018.12.092
Keywords
Tartaric-sulfuric acid anodizing (TSA); Sealing; Corrosion resistance
Funding
- National Science Foundation of China [50901033]
- funds of Hubei Provincial Key Laboratory Green Materials for Light Industry [[2013]2-6, [2013]2-14]
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Anodizing and post-treatment of aluminium alloys can effectively improve their surface corrosion resistance. In this work, we demonstrate the effectiveness a potassium permanganate sealing (M-S) treatment of tartaric-sulfuric anodized 2024 aluminium alloy. This post anodic oxidation process was performed by immersing samples in the electrolyte solution at 70 degrees C for 30 min. Immersion and salt spray tests show such a M-S sealing processing can result in much improved corrosion resistance. The M-S treated samples can resist 240 h of salt spray test without corrosion pitting. Detailed morphological, microstructural and chemical analyses have been used to reveal mechanistic effects of the M-S retreatment. Interfacial electrochemical impedance measurements were performed to directly compare the corrosion behaviors of Al alloys after different post-treatments.
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