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Ni-Mo-Co ternary alloy as a replacement for hard chrome

机译：Ni-Mo-Co三元合金替代硬铬

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摘要

Hard chrome is the most extensively used electroplated coating in the aerospace and automotive industries due to its attractive properties such as high hardness and excellent wear resistance. However, due to the health risks associated with the use of hexavalent chromium baths during electroplating, there is a need to identify an alternative to this coating. In this study a nickel-molybdenum alloy with cobalt as the alloying element has been developed. The coating was characterized for its micro hardness, wear resistance, coefficient of friction and corrosion resistance. The coating was also subjected to heat treatment at temperatures in the range of 200°-600℃. It was observed that the micro hardness of Ni-Mo-Co (730 KHN) alloy coating under optimized conditions is apparently quiet similar to that of the most probable substitute Co-P (745 VHN) and hard chrome (800 VHN) coatings. The tribological properties like the wear rate and coefficient of friction of the 400 ℃ heat treated Ni-Mo-Co coating were noticed to be better compared to hard chrome coating. The electrochemical impedance and polarization studies showed that the corrosion resistance of heat treated Ni-Mo-Co alloy was better than as-deposited Ni-Mo-Co and Ni-Mo coating.
机译：硬铬由于其吸引人的特性（例如高硬度和出色的耐磨性）而成为航空航天和汽车工业中使用最广泛的电镀涂层。然而，由于与电镀期间使用六价铬浴有关的健康风险，因此需要确定该涂层的替代物。在这项研究中，已经开发了一种以钴为合金元素的镍钼合金。该涂层的特征在于其显微硬度，耐磨性，摩擦系数和耐腐蚀性。还在200°-600℃范围内的温度下对涂层进行热处理。已观察到，在最优化条件下，Ni-Mo-Co（730 KHN）合金涂层的显微硬度与大多数可能替代的Co-P（745 VHN）和硬铬（800 VHN）涂层相似，非常安静。观察到400℃热处理的Ni-Mo-Co涂层的摩擦学性能（如磨损率和摩擦系数）比硬铬涂层更好。电化学阻抗和极化研究表明，热处理后的Ni-Mo-Co合金的耐蚀性优于沉积的Ni-Mo-Co和Ni-Mo涂层。

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  • 来源
    《Applied Surface Science》 |2013年第ptab期|167-174|共8页
  • 作者

    Meenu Srivastava; C. Anandan; V.K. William Grips;

  • 作者单位

    Surface Engineering Division, Council of Scientific and Industrial Research National Aerospace Laboratories, HAL Airport Road, Bangalore 560017, India;

    Surface Engineering Division, Council of Scientific and Industrial Research National Aerospace Laboratories, HAL Airport Road, Bangalore 560017, India;

    Surface Engineering Division, Council of Scientific and Industrial Research National Aerospace Laboratories, HAL Airport Road, Bangalore 560017, India;

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  • 正文语种 eng
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  • 关键词

    Ni-Mo-Co; Ni-Mo; Microstructure; Electrochemical impedance spectroscopy; Photoelectron spectroscopy;

    机译：Ni-Mo-Co;镍钼微观结构电化学阻抗谱;光电子能谱;

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