| 引用本文: | 王玉洁,张鹏,杜云慧,杨辉,付英健,吴硕.AZ51镁合金交流微弧氧化膜层厚度的研究[J].材料科学与工艺,2015,23(5):123-128.DOI:10.11951/j.issn.1005-0299.20150522. |
| WANG Yujie,ZHANG Peng,DU Yunhui,YANG Hui,FU Yingjian,WU Shuo.Research on thickness of AC micro-arc oxidation coating for AZ51 magnesium alloy[J].Materials Science and Technology,2015,23(5):123-128.DOI:10.11951/j.issn.1005-0299.20150522. |
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| 摘要: |
| 在氢氧化钾和氟化钾组成的电解液中,采用交流微弧氧化处理技术对AZ51镁合金进行表面处理.研究了处理参数对陶瓷氧化膜层厚度的影响,确定了膜层的组织构成.结果表明:KOH浓度在300~400 g/L时,膜层厚度几乎随着KOH浓度的增加呈线性增长；KF浓度在400~1 000 g/L,膜层厚度增加最快；电压处于50~80 V时,能够促进膜层的快速生长；当电解液温度在20~70 ℃,随着电解液温度的升高,膜层厚度逐渐增加；膜层厚度随处理时间延长快速增长,超过100 s后趋于平缓.膜层主要由氟化镁和氧化镁组成,致密膜层的最大平均厚度约为30 μm,膜层厚度超过30 μm后,膜层将出现“沙化层”. |
| 关键词: AZ51镁合金 交流微弧氧化 膜层生长 厚度 |
| DOI：10.11951/j.issn.1005-0299.20150522 |
| 分类号:TG146.2 |
| 基金项目:北京自然科学基金资助项目(2102039); 国家自然科学基金资助项目(50974010). |
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| Research on thickness of AC micro-arc oxidation coating for AZ51 magnesium alloy |
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WANG Yujie,ZHANG Peng,DU Yunhui,YANG Hui,FU Yingjian,WU Shuo
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(Beijing Jiaotong University,Beijing 100044,China)
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| Abstract: |
| The surface treatment of AZ51 magnesium alloy was carried out in KOH+KF electrolyte utilizing AC micro-arc oxidation treatment technology. The effect of treatment parameters on coating thickness was investigated, the structure of coating was determined.The results show that:coating thickness grows almost in linearly as the concentration of KOH(300~400 g/L) increases;coating thickness increases fast as concentration of KF(400~1 000 g/L) grows;coating grows rapidly between the voltage range of 50~80 V;coating thickness increases as the electrolyte temperature rises when electrolyte temperature is between 20 ℃ to 70 ℃;coating thickness grows rapidly with the lengthen of treatment time, but the growth tends to be gentle beyond 100 seconds.The coating is made up of MgF2 and MgO mainly and the maximum average thickness of compact coating is about 30 μm.But after more than 30 μm, sandy layer will appear on coating surface. |
| Key words: AZ51 magnesium alloy AC micro-arc oxidation coating growth thickness |
