Effects of graphite additives in electrolytes on the microstructure and corrosion resistance of Alumina PEO coatings

被引：67

作者：

Lv, Guo-Hua ^{[1
]}

Chen, Huan ^{[1
]}

Gu, Wei-Chao ^{[1
]}

Feng, Wen-Ran ^{[1
]}

Li, Li ^{[1
]}

Niu, Er-Wu ^{[1
]}

Zhang, Xian-Hui ^{[2
]}

Yang, Si-Ze ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China

[2] Changchun Univ Sci & Technol, Coll Sci, Changchun 130022, Jilin Province, Peoples R China

来源：

CURRENT APPLIED PHYSICS | 2009年 / 9卷 / 02期

基金：

中国国家自然科学基金;

关键词：

Plasma electrolytic oxidation; Graphite grains; Coating microstructure; Corrosion resistance; MICRO-ARC OXIDATION; CERAMIC COATINGS; TRIBOLOGICAL BEHAVIOR; MECHANICAL-PROPERTIES; ALLOY; PERFORMANCE; SILICATE; FILMS;

D O I：

10.1016/j.cap.2008.03.001

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In the present work, graphite grains of different sizes were added into the electrolyte to prepare ceramic coatings on aluminum by plasma electrolytic oxidation (PEO). Scanning electron microscopy (SEM) coupled with an energy dispersive X-ray analysis system (EDX), Raman spectroscopy and X-ray diffractometer (XRD) were used to characterize the coatings. A three-electrode system was used to evaluate the corrosion performances of the coatings in a 3.5 wt.% NaCl solution. It was found that the morphology and corrosion performance of the coatings were significantly influenced by the size of the graphite grains. Compared with bigger graphite grains, finer ones were involved in the oxidation process and embedded within the ceramic coatings, which made the coatings less porous and more compact. Thus, the corrosion resistance of the coatings with embedded graphite grains was greatly improved. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：324 / 328

页数：5

共 21 条

[1] Corrosion, erosion and erosion-corrosion performance of plasma electrolytic oxidation (PEO) deposited Al2O3 coatings [J].