New findings on properties of plasma electrolytic oxidation coatings from study of an Al-Cu-Li alloy

被引：193

作者：

Cheng, Ying-liang ^{[1
]}

Xue, Zhi-gang ^{[1
]}

Wang, Qun ^{[1
]}

Wu, Xiang-Quan ^{[1
]}

Matykina, E. ^{[2
]}

Skeldon, P. ^{[3
]}

Thompson, G. E. ^{[3
]}

机构：

[1] Hunan Univ, Coll Mat Sci & Engn, Changsha 410082, Hunan, Peoples R China

[2] Univ Complutense, Dept Ciencia Mat, Fac Quim, E-28040 Madrid, Spain

[3] Univ Manchester, Sch Mat, Ctr Corros & Protect, Manchester M13 9PL, Lancs, England

来源：

ELECTROCHIMICA ACTA | 2013年 / 107卷

基金：

美国国家科学基金会; 英国工程与自然科学研究理事会;

关键词：

Plasma electrolytic oxidation; Al-Cu-Li alloy; Cuprite; Dry sliding wear; Discharge types; CERAMIC COATINGS; MICROARC OXIDATION; OXIDE COATINGS; MECHANICAL-PROPERTIES; PHASE-COMPOSITION; THERMAL-BEHAVIOR; GROWTH-MECHANISM; TI-6AL-4V ALLOY; ALUMINUM; CORROSION;

D O I：

10.1016/j.electacta.2013.06.022

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Coatings have been produced on an 2A97 Al-Cu-Li alloy by plasma electrolytic oxidation (PEO) using dilute and concentrated sodium silicate solutions with pulsed electrical regimes. Brownish red coatings were formed, especially in the dilute silicate solution. The colour is attributed to cuprite, formed by oxidation of copper in the alloy. The main phases of the coatings formed in the dilute and concentrated electrolytes are gamma-Al2O3 and mullite, respectively. A bi-layer coating is formed in the dilute electrolyte, with large pores between the layers. The outer layer contains a small amount of delta-Al2O3 and ot-Al2O3. Coatings formed using both electrolytes provided good corrosion resistance. The wear resistance was superior for the coating formed in the dilute electrolyte, since the outer layer is compact and of high strength and after the removal of the outer layer, a more adherent inner layer, with a hardness of 9-12 GPa, provides excellent protection. Based on the coating microstructure, a modified model of coating growth was proposed. (C) 2013 Elsevier Ltd. All rights reserved.

引用

页码：358 / 378

页数：21

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