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Alternatives to Dichromate Sealer in Anodizing Operations

机译：阳极氧化操作中重铬酸盐封闭剂的替代品

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摘要

Ogden Air Logistics Center (OO-ALC) is the primary facility within the United States Air Force for maintaining and overhauling aircraft landing gear. Aluminum landing gear components are anodized at OO-ALC to provide enhanced corrosion resistance, paint adhesion, and wear resistance; a sodium dichromate sealing operation usually completes the anodizing process. During sealing, the pores of the anodized (oxide) layer are hydrated, which fills the pores and provides improved corrosion resistance. However, this sealer contains hexavalent chromium, which is listed on the Environmental Protection Agency's list of industrial toxic chemicals that are targeted for voluntary reduction or elimination. The specification that outlines the sodium dichromate sealing process delineates three alternative processes that are approved for use: 1) boiling de-ionized water, 2) cobalt acetate, and 3) nickel acetate. While some research to support the use of these and other sealing processes has been gathered under past efforts, additional work must be conducted to fully integrate non-chromate sealers into OO-ALC's anodizing operations. To meet this need, the Air Force Research Laboratory tasked Concurrent Technologies Corporation to identify viable alternatives to the sodium dichromate sealer, conduct testing on these alternatives, and recommend the most promising sealer(s) for implementation based on the test results. This paper will describe the requirements for anodizing and sealing operations within OO-ALC, as well as the sealing technologies that are available and a path forward to demonstrate/validate the most promising alternatives for the specific needs and applications of OO-ALC.
机译：奥格登航空物流中心（OO-ALC）是美国空军内部用于维护和检修飞机起落架的主要设施。铝制起落架组件在OO-ALC上进行了阳极氧化处理，以提供增强的耐腐蚀性，涂料附着力和耐磨性。重铬酸钠密封操作通常会完成阳极氧化过程。在密封期间，阳极氧化（氧化物）层的孔被水合，从而填充孔并提供改善的耐腐蚀性。但是，这种密封剂含有六价铬，该铬已列在环境保护局的工业有毒化学物质清单中，以自愿减少或消除。概述重铬酸钠密封过程的规范描述了三个可使用的替代过程：1）沸腾去离子水，2）乙酸钴和3）乙酸镍。尽管在过去的努力下已收集到一些支持使用这些密封工艺和其他密封工艺的研究，但必须进行更多的工作才能将非铬酸盐密封剂完全整合到OO-ALC的阳极氧化工艺中。为了满足这一需求，空军研究实验室委托Concurrent Technologies Corporation找出重铬酸钠密封剂的可行替代品，对这些替代品进行测试，并根据测试结果推荐最有希望的密封剂用于实施。本文将描述OO-ALC内对阳极氧化和密封操作的要求，以及可用的密封技术，以及展示/验证针对OO-ALC的特定需求和应用的最有希望的替代品的途径。

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  • 来源
    《Metal finishing》 |2011年第11a期|p.275-287|共13页
  • 作者

    ROBERT B. MASON; SARAH CLARK; MELISSA KLINGENBERG; ELIZABETH BERMAN; NATASHA VOEVODIN;

  • 作者单位

    Concurrent Technologies Corporation, Largo, f la. Dayton, Ohio and Johnstown, Pa;

    Concurrent Technologies Corporation, Largo, f la. Dayton, Ohio and Johnstown, Pa;

    Concurrent Technologies Corporation, Largo, f la. Dayton, Ohio and Johnstown, Pa;

    United States Air Force Research Laboratory, Wright-Patterson Air Force Base, Ohio;

    United States Air Force Research Laboratory/University of Dayton Research Institute Dayton, Ohio;

  • 收录信息 美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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