Corrosion-Fatigue Performance of Hard Anodized and MAO-Coated 2024-T3 and 7075-T6 Aerospace Al Alloys

被引：7
|
作者：
Madhavi, Y. [1 ,2 ]
Krishna, Rama L. [1 ]
Narasaiah, N. [1 ]
机构：
[1] Int Adv Res Ctr Powder Met & New Mat ARCI, Ctr Engn Coatings, Hyderabad, India
[2] Natl Inst Technol NIT, Met & Mat Engn, Warangal, Andhra Pradesh, India
来源：
TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS | 2021年 / 74卷 / 09期
关键词：
Plasma electrolytic oxidation; Impedance; Polarization; High cycle fatigue; Shot peening; Micro-arc oxidation; MICRO ARC OXIDATION; ALUMINUM-ALLOY; PEO TREATMENT; COATINGS; BEHAVIOR; LIFE;
D O I：
10.1007/s12666-021-02313-7
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
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.
引用
收藏
页码：2231 / 2243
页数：13
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