Research Information System
Thesis Type: Postgraduate
Institution Of The Thesis: Gazi University, Fen Bilimleri Enstitüsü, Turkey
Approval Date: 2022
Thesis Language: Turkish
Student: Ufuk AKYILDIZ
Supervisor: Oğuz Poyrazoğlu
Abstract:
The anodizing process applied for aluminum alloys to show better corrosion resistance under adverse working conditions affects the mechanical properties of material. In this study, the effects of anodic coating on the mechanical properties and corrosion resistance of aluminium alloys were experimentally investigated. Specimens prepared from AA7050-T7451 and AA2024-T3 alloy were used in the experiments. Chromic acid anodized (CAA) and nonanodized (ASM) specimens with coating thicknesses varying between 2-5 μm were conducted to a series of axial fatigue tests at a stress (R) ratio of -1 and a frequency of 90 Hz and also a series of tensile tests. S-N fatigue curves created with the test datas and Weilbull equation showed that the anodic treatment significantly affected the fatigue performance of the alloy. When ASM and CAA samples were compared, it was observed that the anodic coating did not affect the fatigue strength in low cycles, but the fatigue performance of the AA7050-T7451 alloy gradually decreased between 103 –107 cycles. In addition, an increase of approximately 2,5 % was observed on the maximum tensile and yield strengths of AA7050-T7451 specimes due to the brittle nature of the anodic coating. In salt spray tests using AA2024-T3 material, CAA samples showed very good corrosion resistance compared to ASM samples.
Key Words : Anodizing, Aluminum alloys, Corrosion, Fatigue performance, Salt
spray test, AA7050-T7451, AA2024-T3