引用本文:吴楠， 赵红阳， 郭媛媛， 巨东英， 魏荣华.AZ31镁合金沉积类金刚石薄膜的表面形貌和腐蚀行为[J].中国表面工程,2014,27(1):81~86
WU Nan, ZHAO Hongyang, GUO Yuanyuan, JU Dongying, WEI Ronghua.Surface Morphology and Corrosion Behavior of AZ31 Magnesium Alloy Deposited with Diamond-like Carbon Film[J].China Surface Engineering,2014,27(1):81~86
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AZ31镁合金沉积类金刚石薄膜的表面形貌和腐蚀行为
吴楠， 赵红阳， 郭媛媛， 巨东英， 魏荣华1,2
1. 辽宁科技大学 材料与冶金学院, 辽宁 鞍山 114051;2. 美国西南研究院, 美国 圣安东尼奥 TX78238
摘要:
为了改善镁合金的耐蚀性，扩展其应用范围，采用等离子全方位离子镀膜技术在AZ31镁合金表面沉积了含有SiN和SiO的2种类金刚石(Diamondlike carbon，DLC)薄膜，研究了其表面形貌及其在3.5%NaCl溶液中的腐蚀行为，探究了DLC薄膜对AZ31镁合金腐蚀行为的影响。利用SEM和AFM观察了AZ31镁合金表面沉积DLC薄膜的表面形貌，采用电化学法测试表面沉积DLC薄膜的AZ31镁合金在3.5%NaCl溶液中的极化曲线和开路电位，通过拉伸试验测试其在空气和3.5%NaCl溶液中的应力应变。结果表明：镁合金试样表面的DLC薄膜光滑致密，在3.5%NaCl溶液中表面沉积DLC薄膜AZ31镁合金的极化行为与表面未沉积DLC薄膜AZ31镁合金相似，表面沉积DLC薄膜AZ31镁合金电位正向移动，耐蚀性提高；与表面未沉积DLC薄膜AZ31镁合金相比，在空气中，表面沉积DLC薄膜AZ31镁合金极限抗拉强度与其接近,延伸率略低；在3.5%NaCl溶液中，表面沉积DLC薄膜AZ31镁合金极限抗拉强度略有降低，延伸率略高。
关键词:  类金刚石薄膜  AZ31镁合金  腐蚀  拉伸
DOI：10.3969/j.issn.1007-9289.2014.01.013
分类号:
基金项目:
Surface Morphology and Corrosion Behavior of AZ31 Magnesium Alloy Deposited with Diamond-like Carbon Film
WU Nan, ZHAO Hongyang, GUO Yuanyuan, JU Dongying, WEI Ronghua1,2
1. School of Materials and Metallurgy, University of Science and Technology Liaoning, Anshan 114051, Liaoning;2. Southwest Research Institute, San Antonio TX78238, USA
Abstract:
To improve the corrosion resistance of AZ31 magnesium alloy and expanding its application, two types of diamondlike carbon (DLC) films containing SiN and SiO were deposited on commercial AZ31 magnesium alloy by using plasma immersion ion deposition (PIID). The surface morphology and corrosion behavior of AZ31 magnesium alloy deposited with DLC film were studied. The surface morphology of DLC film deposited on AZ31 alloy was observed by SEM and AFM, the polarization curve and open circuit potential in 3.5% NaCl solution were measured by electrochemical method, and the stress and strain in air and 3.5% NaCl solution were studied by tension machine. The results show that DLC films on AZ31 Mg alloy are smooth and dense. In 3.5% NaCl solution, the polarization behavior of AZ31 magnesium alloy with DLC film is familiar with that of the uncoated. The open circuit potential of the DLCcoated magnesium moves towards the positive, and their corrosion resistance is improved. Compared with that of the uncoated, the ultimate tensile strength of AZ31 Mg alloy with DLC film is almost the same as that in air, and the elongation rate is slightly lower. In 3.5% NaCl solution, the ultimate tensile strength is lower, while the elongation rate is higher.
Key words:  diamondlike carbon  AZ31 magnesium alloy  corrosion  tension
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