A356铝合金扫描式微弧氧化涂层的成膜过程及耐腐蚀性能*

doi:10.11901/1005.3093.2016.395

材料研究学报

2016, Vol. 30

Issue (12): 914-920 DOI: 10.11901/1005.3093.2016.395

本期目录 | 过刊浏览

A356铝合金扫描式微弧氧化涂层的成膜过程及耐腐蚀性能*

夏伶勤,韩建民(

),杨莎,杨智勇,李卫京

北京交通大学机械与电子控制工程学院北京 100044

Growth Process of Scanning Microarc Oxidation Coatings on A356 Alloy and their Corrosion Resistance

Lingqin XIA,Jianmin HAN(

),Sha YANG,Zhiyong YANG,Weijing LI

School of Mechanical Electric and Control Engineering, Beijing Jiaotong University, Beijing 100044, China

引用本文:

夏伶勤,韩建民,杨莎,杨智勇,李卫京. A356铝合金扫描式微弧氧化涂层的成膜过程及耐腐蚀性能*[J]. 材料研究学报, 2016, 30(12): 914-920.
Lingqin XIA, Jianmin HAN, Sha YANG, Zhiyong YANG, Weijing LI. Growth Process of Scanning Microarc Oxidation Coatings on A356 Alloy and their Corrosion Resistance[J]. Chinese Journal of Materials Research, 2016, 30(12): 914-920.

全文: PDF(3852 KB) HTML

摘要:

采用扫描式微弧氧化(SMAO)技术在A356铝合金表面制备了陶瓷涂层。测定了反应过程中涂层的电压-时间、动力学生长曲线, 研究了涂层的显微组织、成分分布, 分析涂层的相组成及显微硬度分布, 并比较了氧化前后极化曲线的变化。结果表明, 在硅酸盐溶液中获得的涂层主要由α-Al₂O₃、γ-Al₂O₃和莫来石组成, 涂层与基体呈现良好的冶金结合。与A356传统式微弧氧化(CMAO)涂层相比, SMAO涂层中α-Al₂O₃含量略多、孔隙率更低, 显微硬度更高。此外, 两种氧化处理之后, 铝合金的耐腐蚀能力均得到显著提高。

关键词 ：材料失效与防护, 铝合金, 扫描式微弧氧化, 陶瓷膜, 腐蚀性能

Abstract：

Al-alloy A356 was treated by scanning micro arc oxidation (SMAO) method. The voltage-time and coating thickness-time curves were recorded. The microstructure, composition,phase constituent and microhardness profile of coatings werecharacterized. The corrosion behavior of the composite was evaluated by polarization test. Results show that the coating deposited in silicate electrolyte consists of α-Al₂O₃, γ-Al₂O₃ and mullite. The coating and the substrate presented excellent metallurgical bonding. Compared with the common micro arc oxidation (CMAO) coatings on A356 alloy, the SMAO coating contained higher amount of α-Al₂O₃ phase withless porous, and possessed higher micro hardness. However, after treatment by either CMAO or SMAO, the corrosion resistance of A356 alloy was significantly improved.

Key words： materials failure and protection Al-alloy scanning micro arc oxidation ceramic coating corrosion resistance

收稿日期: 2016-07-02

基金资助:* 国家自然科学基金51371022, 中央高校基本科研业务费专项资金2015JBM076, 中国铁路总公司科技研究开发计划课题2015008-C资助项目

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https://www.cjmr.org/CN/10.11901/1005.3093.2016.395 或 https://www.cjmr.org/CN/Y2016/V30/I12/914

图1 扫描式微弧氧化处理系统示意图

表1 A356铝合金的化学成分

图2 (a)SMAO(电极距离5、10 mm)和CMAO微弧氧化过程中电压-时间变化曲线; (b)为(a)的局部放大图

图3 电极距离5 mm时A356铝合金扫描式微弧氧化涂层生长曲线

表2 微弧氧化涂层表面元素组成

图4 A356合金扫描式微弧氧化陶瓷膜的表面形貌

图5 A356基体及涂层表面XRD图谱

图6 SMAO和CMAO涂层截面显微硬度分布

图7 A356合金微弧氧化截面照片

图8 A356基体及CMAO、SMAO的涂层在3.5% NaCl中的极化曲线

表3 A356基体及CMAO、SMAO涂层的腐蚀电流密度

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