| 引用本文: | 田钦文， 郭小娟， 李慕勤， 马天钰.微弧氧化小阴极放电及膜层均匀性[J].中国表面工程,2015,28(3):70~75 |
| TIAN Qinwen, GUO Xiaojuan, LI Muqin, MA Tianyu.Arcing Behavior for Micro-arc Oxidation with Small Cathode Configuration and Uniformity of Coatings[J].China Surface Engineering,2015,28(3):70~75 |
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| 摘要: |
| 针对微弧氧化工艺中小功率电源大面积处理或局部腔体处理问题，研究小阴极微弧氧化工艺方法。采用550 V恒压模式，阳极为Φ 70 mm×0.5 mm的纯铝样件，阴极为Φ 15 mm不锈钢棒，浸没到硅酸钠基的电解液内的长度可变，探讨放电伏安特性和膜层厚度、表面形貌以及电化学行为的均匀性。结果表明：小阴极可以实现微弧氧化，但小阴极增加了阴极阳极间放电的等效阻抗，会造成微弧放电较弱、成膜速率较低，微弧氧化样品的径向膜层厚度和耐蚀性呈现不均匀性，靠近样品边缘膜层较厚，中心区域膜层较薄；增加阴极尺寸，膜厚均匀性从74%（阴极深入20 mm）提高到78%（阴极深入40 mm），同时膜层的耐腐蚀区域加大。结果对于小功率电源大面积微弧氧化和腔体内部微弧氧化具有重要的指导意义。 |
| 关键词: 微弧氧化 小阴极 均匀性 耐腐蚀性 涂层厚度 |
| DOI：10.11933/j.issn.1007-9289.2015.03.011 |
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| Arcing Behavior for Micro-arc Oxidation with Small Cathode Configuration and Uniformity of Coatings |
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TIAN Qinwen, GUO Xiaojuan, LI Muqin, MA Tianyu
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Key Lab. of Biomedical Materials of Heilongjiang Province Colleges, Jiamusi University, Jiamusi 154007, Harbin
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| Abstract: |
| Microarc oxidation (MAO) with a smallsize cathode was investigated for surface treatment of large area workpiece using electrical unit with lower rating power or local treatment of cavityshaped objects. The MAO processes were performed in a constantvoltage mode with a voltage of 550 V. The aluminum samples with size of Φ 70 mm×0.5 mm act as anode and a stainless steel rod with a diameter of Φ 15 mm works as cathode with variable length immersed in the electrolyte. The arcing behavior and uniformity of coating thickness, surface morphology and electrochemical behavior were investigated. The results show that MAO processes may be conducted using smallsize cathodes. However, the smallsize cathode may lead to a weak arcing behavior and lower formation rate of MAO coatings, and it may contribute to larger equivalent resistance between electrodes. The thickness and corrosionresistance along the radical direction on the samples are not uniform. The coatings are thick near the sample edge while they are thin at the central zone. With the increase of the cathode size, the uniformity of coating thickness increases from 74% for 20 mm cathode to 78% for 40 mm cathode, and the corrosionresistance area grows larger. The results are significant for surface treatment of large area parts using lower electrical power, as well as local treatment of cavityshaped objects. |
| Key words: microarc oxidation smallsize cathode uniformity corrosionresistance coating thickness |
