TEM analysis and wear resistance of the ceramic coatings on Q235 steel prepared by hybrid method of hot-dipping aluminum and plasma electrolytic oxidation

被引：31

作者：

Lu Lihong ^{[1
,2
]}

Zhang Jingwu ^{[1
]}

Shen Dejiu ^{[1
]}

Wu Lailei ^{[1
]}

Jiang Guirong ^{[1
]}

Li Liang ^{[3
]}

机构：

[1] Yanshan Univ, Coll Mat Sci & Engn, State Key Lab Metastable Mat Sci & Technol, Qinhuangdao 066004, Peoples R China

[2] Chinese Peoples Armed Police Acad, Sci & Res Dept, Langfang 065000, Peoples R China

[3] Tsinghua Univ, State Key Lab Automot Safety & Energy, Beijing 100084, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2012年 / 512卷 / 01期

基金：

中国国家自然科学基金;

关键词：

Plasma electrolytic oxidation; Hot-dipping aluminum; TEM; Hardness; Wear resistance; MICRO-ARC OXIDATION; CORROSION-RESISTANCE; ALLOYS;

D O I：

10.1016/j.jallcom.2011.08.103

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：

The hybrid method of PEO and hot-dipping aluminum (HDA) was employed to deposit composite ceramic coatings on the surface of Q235 steel. The composition of the composite coatings was investigated with X-ray diffraction (XRD) and transmission electron microscopy (TEM), respectively. The cross-section microstructure and micro-hardness of the treated specimens were investigated and analyzed with scanning electron microscopy (SEM) and microscopic hardness meter (MHM), respectively. The wear resistance of the ceramic coatings was investigated by a self-made rubbing wear testing machine. The results indicate that metallurgical bonding can be observed between the ceramic coatings and the steel substrate. There are many micro-pores and micro-cracks, which act as the discharge channels and result of quick and non-uniform cooling of melted sections in the plasma electrolytic oxidation ceramic coatings. The phase composition of the ceramic coatings is mainly composed of amorphous phase and crystal Al2O3 oxides. The crystal Al2O3 phase includes kappa-Al2O3, theta-Al2O3 and beta-Al2O3. The grain size of the kappa-Al2O3 crystal is quite non-uniform. The hardness of the ceramic coatings is about HV1300 and 10 times higher than that of the Q235 substrate, which was favorable to the better wear resistance of the ceramic coatings. (C) 2011 Elsevier B. V. All rights reserved.

引用

页码：57 / 62

页数：6

共 14 条

[11] Structure and properties characterization of ceramic coatings produced on Ti-6Al-4V alloy by microarc oxidation in aluminate solution [J].