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

页码：2231 / 2243

页数：13

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