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首页> 外文期刊>Materials Chemistry and Physics >Alternatives for hard chromium plating: Nanostructured coatings for severe-service valves
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Alternatives for hard chromium plating: Nanostructured coatings for severe-service valves

机译：硬铬镀层的替代品：重型阀门的纳米结构涂层

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摘要

In this paper, a variety of chromium-free protective coatings were evaluated as alternatives for hard chromium (HC) electroplating for valve applications, such as nanostructured cobalt-phosphor (NCP) deposited by electroplating and tungsten/tungsten carbide (W/WC) prepared by chemical vapor deposition. A series of laboratory tests including hardness, micro scratch, pin-on-disk and electrochemical polarization measurements were performed in order to compare the performance of the different coatings. In addition, mechanical resistance and fatigue resistance were evaluated using prototype valves with coated ball under severe tribo-corrosion conditions. It was shown that W/WC coating exhibits superior resistance to wear and corrosion due to high hardness and high resistance to pitting, respectively while NCP exhibits better wear resistance than HC with alumina ball and low corrosion potential which allow to use it as protective (sacrificial) coating. Both nanostructured coatings exhibited attractive tribo-mechanical and functional characteristics compared to hard chromium.
机译：在本文中，评估了多种无铬保护性涂层，以替代阀门应用中的硬铬（HC）电镀，例如通过电镀沉积的纳米结构钴-磷（NCP）和制备的钨/碳化钨（W / WC）通过化学气相沉积。为了比较不同涂层的性能，进行了一系列的实验室测试，包括硬度，微划痕，针对磁盘和电化学极化测量。此外，在恶劣的摩擦腐蚀条件下，使用带涂层球的原型阀对机械阻力和疲劳强度进行了评估。结果表明，W / WC涂层由于具有较高的硬度和较高的抗点蚀性而分别具有优异的耐磨性和耐腐蚀性，而NCP的耐磨性比具有氧化铝球的HC更好，并且腐蚀电位低，因此可以用作保护性材料（牺牲品） ） 涂层。与硬铬相比，两种纳米结构涂层均表现出有吸引力的摩擦机械和功能特性。

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  • 来源
    《Materials Chemistry and Physics》 |2013年第3期|522-528|共7页
  • 作者

    L. Vernhes; M. Azzi; J.E. Klemberg-Sapieha;

  • 作者单位

    Department of Engineering Physics, Ecole Polytechnique, C.P. 6079, Succ. Centre Ville, Montreal, Quebec, Canada H3C 3A7,Velan Inc., 7007 Cote de Liesse, Montreal, Quebec, Canada H4T 1X8;

    Department of Mechanical Engineering, Notre Dame University-Louize, Lebanon;

    Department of Engineering Physics, Ecole Polytechnique, C.P. 6079, Succ. Centre Ville, Montreal, Quebec, Canada H3C 3A7;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Thin films; Coatings; Nanostructures; Wear; Corrosion; Tribology;

    机译：薄膜;涂料;纳米结构;穿;腐蚀;摩擦学;

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