Preparation of Micro-Arc Oxidation Coating and its Thermal Shock Resistance on 7A04 Aluminum Alloy

Hu Dongsheng; Zhang Datong

doi:10.15980/j.tzzz.2013.01.003

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Preparation of Micro-Arc Oxidation Coating and its Thermal Shock Resistance on 7A04 Aluminum Alloy
Vol. 33, Issue 1, Pages: 76-80(2013)
Published： 2013 ，
DOI： 10.15980/j.tzzz.2013.01.003

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[1]胡冬生,张大童.7A04铝合金微弧氧化膜的制备及其抗热震性研究[J].特种铸造及有色合金,2013,33(01):76-80.

Hu Dongsheng, Zhang Datong. Preparation of Micro-Arc Oxidation Coating and its Thermal Shock Resistance on 7A04 Aluminum Alloy. [J]. Special Casting & Nonferrous Alloys 33(1):76-80(2013)
[1]胡冬生,张大童.7A04铝合金微弧氧化膜的制备及其抗热震性研究[J].特种铸造及有色合金,2013,33(01):76-80. DOI： 10.15980/j.tzzz.2013.01.003.

Hu Dongsheng, Zhang Datong. Preparation of Micro-Arc Oxidation Coating and its Thermal Shock Resistance on 7A04 Aluminum Alloy. [J]. Special Casting & Nonferrous Alloys 33(1):76-80(2013) DOI： 10.15980/j.tzzz.2013.01.003.

摘要

利用扫描电镜（SEM）、X射线衍射（XRD）等分析手段

研究了7A04铝合金微弧氧化陶瓷层的生长规律

分析了不同生长阶段膜层相结构及形貌。研究表明

膜厚随处理时间延长先增加后减少

整体生长状况偏离了直线规律;处理3min时膜层垂直于表面柱状生长

此后呈平面沉积堆叠型生长;膜层主要由γ-Al2O3构成。膜层经循环热冲击23次

无起皮、脱落

表现出良好的抗热震性能。

Abstract

Growth of micro-arc oxidation coating on 7A04 aluminum alloy was observed by SEM （scanning electron microscope） and XRD （X-ray diffraction） to understand the phase constituent and morphology of the film at different growth stages. The results show that the coating thickness is increased firstly and then decreased with the increase of oxidized time. The whole growth is departed from the linear behavior. The growth mechanism of the coatings is characterized by 2 stages: in the initial

columnar growth of the coating perpendicular to the substrate surface; in the second stage

planar sputtering and piling up. The coating is mainly composed of γ -Al2O3. The coating exhibits favorable thermal resistance after heating at 550 ℃ for 5 min and shock chilling at room temperature for 23 times.