Corrosion resistance of TiN/TiAlN-coated ADI by cathodic arc deposition
Corrosion resistance of TiN/TiAlN-coated ADI by cathodic arc deposition
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DOI：
10.1016/j.msea.2005.12.014
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发表时间：
2006-04-15
期刊：
影响因子：
6.4
通讯作者：
Lai, KL
中科院分区：
文献类型：
--
作者：
Hsu, CH;Chen, ML;Lai, KL
由于其低成本、高抗拉强度、抗疲劳性和耐磨性，奥贝球铁（ADI）已被广泛用于各种机械应用中。然而，与上述机械性能的通用性相反，ADI的缺点是其表面硬度（Hv：396）和耐腐蚀性。而且，由于其相对低的等温淬火温度福尔斯落在Ms-450摄氏度（Ms：马氏体开始温度）的范围内，ADI不能使用传统的高温热处理进行表面硬化。研究了TiN和TiAlN涂层对奥贝球铁表面硬度和耐蚀性的影响。采用变靶电流低温阴极电弧沉积（CAD）工艺在ADI上制备TiN/TiAlN复合涂层。分析了TiN/TiAlN涂层ADI的涂层特性和耐蚀性，进一步了解低温CAD涂层工艺的可行性。分析表明，在不改变ADI组织结构的前提下，通过CAD技术可以成功地在ADI表面制备TiN和TiAlN薄膜。在涂层工艺中利用各种目标电流产生可接受的粘附水平，同时将ADI的表面硬度提高2-4倍（Hv：396对1356-1910）。结果表明，随着靶电流的增加，试样的表面粗糙度也增加。TiN/TiAlN涂层ADI试样在3.5wt%NaCl和10 vol. % NaCl溶液中的耐蚀性均高于未涂层试样盐酸。总之，TiN和TiAlN膜的应用，ADI通过低温CAD的涂层工艺是一个可行的表面改性的ADI应用，需要增加表面硬度和耐腐蚀性。(c)2006 Elsevier B. V.保留所有权利。
Because of its low cost, high tensile strength, fatigue resistance, and wear resistance, austempered ductile iron (ADI) has been utilized in a wide variety of mechanical applications. However, in opposition to the versatility of the above-mentioned mechanical properties, the shortcomings of ADI are its surface hardness (Hv: 396) and corrosion resistance. And, because its relatively low austempering temperature falls in the range of Ms-450 degrees C (Ms: the martensite start temperature), ADI cannot be case hardened using traditional high temperature heat treatment. This study explored the effects of TiN and TiAlN coatings on ADI, with respect to surface hardness and corrosion resistance. The process employed for coating TiN/TiAlN onto ADI involved variable target current low temperature cathodic arc deposition (CAD). The coating characteristics and corrosion resistance of TiN/TiAlN-coated ADI were analyzed for further understanding of the feasibility of the low temperature CAD coating process. The analysis showed that TiN and TiAlN films could successfully be coated onto ADI through CAD technology without altering the unique microstructure of ADI. Utilizing a variety of target currents in the coating process yielded an acceptable level of adhesion while-raising the surface hardness of ADI by a factor of 2-4 (Hv: 396 versus 1356-1910). It was observed that as target current increased, the surface roughness of the specimens also increased. TiN/TiAlN-coated ADI specimens exhibited higher corrosion resistance than uncoated ones when both were immersed in separate solutions of both 3.5 wt% NaCl and 10 vol.% HCl. Conclusively, the application of TiN and TiAlN films to ADI through the coating process of low temperature CAD is a viable surface modification for ADI applications that require increased surface hardness and corrosion resistance. (c) 2006 Elsevier B.V. All rights reserved.