龚云柏,王平,胥章鑫,伍婷,龚泽宇,杨彪,胡杰,熊丹,刘济威.植酸添加剂对6061铝合金微弧氧化膜层性能的影响[J].表面技术,2021,50(12):381-389.
GONG Yun-bai,WANG Ping,XU Zhang-xin,WU Ting,GONG Ze-yu,YANG Biao,HU Jie,XIONG Dan,LIU Ji-wei.Effects of Phytce Acid Additives on the Characteristics of Micro-arc Oxidation Coatings on 6061 Aluminum Alloy[J].Surface Technology,2021,50(12):381-389 |
| 植酸添加剂对6061铝合金微弧氧化膜层性能的影响 |
| Effects of Phytce Acid Additives on the Characteristics of Micro-arc Oxidation Coatings on 6061 Aluminum Alloy |
| 投稿时间：2020-12-09 修订日期：2021-04-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2021.12.038 |
| 中文关键词: 6061铝合金 微弧氧化 植酸 微观结构 耐腐蚀性 抗热震性 |
| 英文关键词:6061 aluminum alloy micro-arc oxidation phytic acid microstructure corrosion resistance thermal shock resistance |
| 基金项目:中国博士后科学基金资助项目(2019M663470) |
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| Author | Institution |
| GONG Yun-bai | School of New Energy and Materials, Southwest Petroleum University, Chengdu 610500, China |
| WANG Ping | School of New Energy and Materials, Southwest Petroleum University, Chengdu 610500, China |
| XU Zhang-xin | School of New Energy and Materials, Southwest Petroleum University, Chengdu 610500, China |
| WU Ting | Centre for Materials and Coastal Research, Helmhotz-Zentrum HEREON, Geesthacht 21502, Germany |
| GONG Ze-yu | School of New Energy and Materials, Southwest Petroleum University, Chengdu 610500, China |
| YANG Biao | School of New Energy and Materials, Southwest Petroleum University, Chengdu 610500, China |
| HU Jie | School of New Energy and Materials, Southwest Petroleum University, Chengdu 610500, China |
| XIONG Dan | School of New Energy and Materials, Southwest Petroleum University, Chengdu 610500, China |
| LIU Ji-wei | School of New Energy and Materials, Southwest Petroleum University, Chengdu 610500, China |
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| 中文摘要: |
| 目的 提高6061铝合金微弧氧化膜层的性能。方法 在电解液中加入5 mL/L的植酸，对6061铝合金表面生成的微弧氧化膜层进行改性。记录微弧氧化过程中的电压-时间曲线，采用SEM、EDS、XRD、电化学工作站、马弗炉等仪器设备，研究了植酸的添加对微弧氧化膜层微观结构、元素组成、相组成、耐蚀性、抗热震性等特性的影响。结果 添加植酸后，微弧氧化电压从526 V提高到538 V，微弧氧化放电更加均匀，微弧氧化膜层的生长速率增加，膜层厚度从9.3 μm增加到13.6 μm。放电微孔孔径减小，数量增多，膜层致密均匀，膜层结合力从3.2 N提高到3.9 N，显微硬度增加了39.2HV。植酸中的磷酸根基团和羟基可与基体电离出的Al3+结合生成植酸铝，使膜层中的C、P元素比例提高，Al元素比例降低。微弧氧化过程中，基体中的Al转变成γ-Al2O3和α-Al2O3，添加植酸后，γ-Al2O3和α-Al2O3的衍射峰强度提高。膜层的腐蚀速率从1.085×10–2 mm/a降低到1.565×10–3 mm/a，其耐蚀性能提高，同时具有良好的抗热震性能。结论 植酸的添加优化了微弧氧化膜层的结构，提高了膜层的厚度、显微硬度和膜层结合力，同时改善了膜层的耐蚀性能和抗热震性能。 |
| 英文摘要: |
| This paper aims to improve the properties of micro-arc oxidation (MAO) coatings on 6061 aluminum alloys. In this paper, micro-arc oxidation (MAO) coatings on 6061 aluminum alloys were modified by adding 5 mL/L phytic acid in electrolytes. The voltage-time curve during the micro-arc oxidation process was recorded, and the effects of adding phytic acid on the surface morphology, element composition, phase composition, corrosion resistance, thermal shock resistance and other coatings characteristics of the MAO coatings were studied by using SEM, EDS, XRD, electrochemical workstation, muffle furnace, etc. After adding phytic acid, the micro-arc oxidation voltage was increased from 526 V to 538 V, the micro-arc oxidation discharge was more uniform, and the growth rate of the MAO coatings increased, which improved the coatings thickness from 9.3 μm to 13.6 μm. Meanwhile, diameter of the discharge micropores is reduced, the number is increased, coatings surface is dense and uniform, the bonding force of MAO coatings is enhanced from 3.2 N to 3.9 N, and the microhardness is improved by 39.2HV. Phosphate groups and hydroxyl groups in phytic acid can combine with Al3+ ionized from the matrix to form aluminum phytate, which increases the ratio of C and P elements in MAO coatings and reduces the ratio of Al elements. During the micro-arc oxidation process, the Al in the matrix transforms into γ-Al2O3 and α-Al2O3. After adding phytic acid, the diffraction peak intensity of γ-Al2O3 and α-Al2O3 increases. The corrosion rate of MAO coatings is increased from 1.085×10–2 mm/a to 1.565×10–3 mm/a, the corrosion resistance is improved, simultaneously has good thermal shock resistance. The addition of phytic acid optimizes the structure of MAO coatings, increases the thickness, microhardness and bonding force of coatings, and improves the corrosion resistance and thermal shock resistance of coatings. |
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