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Corrosion-Fatigue Performance of Hard Anodized and MAO-Coated 2024-T3 and 7075-T6 Aerospace Al Alloys
Transactions of the Indian Institute of Metals ( IF 1.6 ) Pub Date : 2021-06-18 , DOI: 10.1007/s12666-021-02313-7
Y. Madhavi , L. Rama Krishna , N. Narasaiah

In the present study, micro-arc oxidation (MAO) coatings were deposited on shot peened high-strength aerospace aluminium alloys namely 2024-T3 and 7075-T6. The comparative corrosion-fatigue performance was evaluated in 3.5 wt.% NaCl corrosion environment for bare, hard anodized and SP + MAO (prior shot-peened and MAO) coated Al alloys. Also, the corrosion behavior of bare and SP + MAO coated Al alloys was assessed through potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) tests. In addition, SP + MAO coatings were characterized for the phase composition, surface/cross-sectional morphologies and surface roughness. Furthermore, the corrosion-fatigue fractured features of coatings were examined to understand the failure mechanisms. The SP + MAO coatings deposited on Al alloys possess superior corrosion-fatigue life as compared to the bare and hard anodized conditions.



中文翻译:

硬质阳极氧化和 MAO 涂层 2024-T3 和 7075-T6 航空航天铝合金的腐蚀疲劳性能

在本研究中,微弧氧化 (MAO) 涂层沉积在喷丸处理的高强度航空航天铝合金上,即 2024-T3 和 7075-T6。在 3.5 wt.% NaCl 腐蚀环境中对裸露、硬质阳极氧化和 SP + MAO(先前喷丸和 MAO)涂层的铝合金进行对比腐蚀疲劳性能评估。此外,通过动电位极化 (PDP) 和电化学阻抗谱 (EIS) 测试评估了裸合金和 SP + MAO 涂层铝合金的腐蚀行为。此外,SP + MAO 涂层的特征在于相组成、表面/横截面形态和表面粗糙度。此外,还检查了涂层的腐蚀疲劳断裂特征,以了解失效机制。

更新日期:2021-06-18
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