Alumina-zirconia coatings produced by Plasma Electrolytic Oxidation on Al alloy for corrosion resistance improvement

被引：43

作者：

Barati, Nastaran ^{[1
]}

Yerokhin, Aleksey ^{[2
]}

Golestanifard, Farhad ^{[3
]}

Rastegari, Saeid ^{[3
]}

Meletis, Efstathios I. ^{[1
]}

机构：

[1] Univ Texas Arlington, Dept Mat Sci & Engn, Arlington, TX 76019 USA

[2] Univ Sheffield, Dept Mat Sci & Engn, Sheffield S1 3JD, S Yorkshire, England

[3] Iran Univ Sci & Technol, Sch Met & Mat Engn, POB 16845-161, Tehran, Iran

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2017年 / 724卷

基金：

英国工程与自然科学研究理事会;

关键词：

Alumina-zirconia composite; Nanostructured coating; Plasma electrolytic oxidation; Corrosion protection; PERFORMANCE; BEHAVIOR; WEAR; MICROSTRUCTURE; FILMS;

D O I：

10.1016/j.jallcom.2017.07.058

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Compact alumina-zirconia nano composites with corrosion protection potential were coated on 7075 Al alloy through the Plasma Electrolytic Oxidation (PEO) method in DC galvanostatic mode. The layers were coated at constant current density of 20 A/dm(2) and 100-350 s growth time in an alkaline K2ZrF6 containing electrolyte. The characteristics of the coatings were investigated as a function of PEO processing time. Electrochemical properties of the layers were studied by conducting potentiodynamic polarization experiments in 3.5% NaCl solution. The results showed that under the present PEO experimental conditions, alumina-zirconia nanostructured coatings can be produced with 10-30 mu m thickness and 0.4 -2.35 mm roughness depending on the processing time. Phase analysis showed that the nanostructured coatings contained alumina and zirconia high temperature phases (tetragonal zirconia and alpha-alumina). Processing for 300 s was found to produce the most compact layer with low surface porosity (0.69%) and 26 mu m thickness. This particular PEO treatment was found to reduce the corrosion rate by 2.5 orders of magnitude compared to the uncoated substrate. This significant improvement in corrosion resistance is attributed to the barrier effect of the dense layer and the presence of tetragonal zirconia. (C) 2017 Elsevier B.V. All rights reserved.

引用

页码：435 / 442

页数：8

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