脉冲电流对1050铝合金微弧氧化过程的影响

doi:10.11902/1005.4537.2017.109

中国腐蚀与防护学报

2018, Vol. 38

Issue (3): 283-288 DOI: 10.11902/1005.4537.2017.109

研究报告

本期目录 | 过刊浏览

脉冲电流对1050铝合金微弧氧化过程的影响

杨钊, 时惠英(

), 蒋百灵, 葛延峰, 张静, 张曼玉, 李研

西安理工大学材料科学与工程学院西安 710048

Effect of Pulse Current on Micro-arc Oxidation Process for 1050 Al-alloy

Zhao YANG, Huiying SHI(

), Bailing JIANG, Yanfeng GE, Jing ZHANG, Manyu ZHANG, Yan LI

Department of Material Science and Engineering, Xi'an University of Technology, Xi'an 710048, China

全文: PDF(2000 KB) HTML

摘要:

为了探讨脉冲电流对1050铝合金微弧氧化过程的影响规律,利用涡流测厚仪和粗糙度仪分别测量陶瓷层厚度和表面粗糙度,采用SEM观察陶瓷层微观形貌,借助动电位极化曲线测试评价陶瓷层耐蚀性,并根据电压变化曲线计算微弧氧化过程能量消耗。结果表明：随着脉冲电流由100 A增加至800 A,微弧诱发时间由360 s缩短至15 s,诱发电压由341 V 升高至887 V;陶瓷层表面放电微孔孔径增大,微孔数量减少,陶瓷层厚度和表面粗糙度增加,耐蚀性略有下降;微弧诱发过程能量消耗先减少后增加,并在200 A时达到最小值仅为18.3 kJ;陶瓷层生长过程能量消耗随脉冲电流增大近似线性增加。

关键词 ：铝合金, 微弧氧化, 脉冲电流, 耐蚀性, 能量消耗

Abstract：

The effect of pulse current on micro-arc oxidation (MAO) process for 1050 Al-alloy was investigated. The thickness and roughness, surface morphology and corrosion performance of the prepared MAO coatings were assessed by means of eddy current thickness gauge and roughness tester, scanning electron microscope (SEM) and potentiodynamic polarization measurement respectively. The energy consumption of MAO process was calculated based on voltage versus time curves. Results indicate that with the increasing pulse current from 100 to 800 A, the arcing time shorten from 360 s to 15 s, while the arcing voltage rose from 341 V to 887 V. The diameter of micropores of the coatings was enlarged but the quantity reduced. While thicker and coarser ceramic coatings were obtained on the Al-alloy but with degraded corrosion resistance. The energy consumption of arcing process decreased at first then raised, and which presented the minimum value of 18.3 kJ for a pulse current of 200 A. The energy consumption of MAO coating process presented approximately a linear growth with the increasing pulse current density.

Key words： Al-alloy micro-arc oxidation pulse current corrosion resistance energy consumption

收稿日期: 2017-07-05

ZTFLH:

TG174.4

基金资助:陕西省自然科学基金 (2018JQ5179)

作者简介:

作者简介杨钊,男,1992年生,硕士生

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	张曼玉
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引用本文:

杨钊, 时惠英, 蒋百灵, 葛延峰, 张静, 张曼玉, 李研. 脉冲电流对1050铝合金微弧氧化过程的影响[J]. 中国腐蚀与防护学报, 2018, 38(3): 283-288.
Zhao YANG, Huiying SHI, Bailing JIANG, Yanfeng GE, Jing ZHANG, Manyu ZHANG, Yan LI. Effect of Pulse Current on Micro-arc Oxidation Process for 1050 Al-alloy. Journal of Chinese Society for Corrosion and protection, 2018, 38(3): 283-288.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2017.109 或 https://www.jcscp.org/CN/Y2018/V38/I3/283

图1 电源输出参数示意图

图2 脉冲电流对铝合金微弧诱发时间和电压的影响

图3 脉冲电流对铝合金MAO过程中电压的影响

表1 不同脉冲电流下铝合金MAO陶瓷层的厚度和粗糙度

图4 脉冲电流对铝合金MAO陶瓷层表面形貌的影响

图5 脉冲电流对铝合金MAO陶瓷层截面形貌的影响

图6 脉冲电流对铝合金MAO陶瓷层在3.5%NaCl溶液中动电位极化曲线的影响

表2 铝合金试样在3.5％NaCl溶液中动电位极化曲线计算结果

图7 脉冲电流对微弧诱发和陶瓷层生长过程能量消耗的影响

图8 脉冲电流对MAO陶瓷层生长单位厚度能量消耗的影响

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