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The hazardous hexavalent chromium formed on trivalent chromium conversion coating: The origin, influence factors and control measures

机译：三价铬转化膜上形成的有害六价铬：成因，影响因素及控制措施

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摘要

In this paper, the effects of processing parameters and constituents of treating-agent on the presence of hazardous hexavalent chromium on trivalent chromium conversion coating were studied. Results showed that shorter immersion time, lower bath pH value as well as lower working and baking temperatures retarded the presence of hexavalent chromium. In addition, the concentration of hexavalent chromium on conversion coatings prepared by the oxalic acid treating-agent was far greater than those on conversion coatings prepared by formic acid and acetic acid treating-agents. Results also indicated that the concentration of hexavalent chromium on conversion coatings was enhanced due to the addition of bivalent cobalt and nitrate anion in treating-agent, especially for oxalic acid conversion coating. However, the addition of hydroxyl compound D-gluconic acid in treating-agent could reduce the concentration of hexavalent chromium effectively. Moreover, a possible formation mechanism of hexavalent chromium on trivalent conversion coating was proposed. Findings of this study provide a better understanding of the formation of hexavalent chromium on trivalent chromium conversion coating and can facilitate the management of trivalent chromium treating-agents and trivalent chromium fasteners.
机译：本文研究了工艺参数和处理剂组成对三价铬转化膜上有害六价铬存在的影响。结果表明，较短的浸泡时间，较低的镀液pH值以及较低的工作和烘烤温度会延迟六价铬的存在。另外，由草酸处理剂制备的转化膜上的六价铬浓度远大于由甲酸和乙酸处理剂制备的转化膜上的六价铬浓度。结果还表明，由于在处理剂中特别是草酸转化膜中添加了二价钴和硝酸根阴离子，提高了转化膜上六价铬的浓度。然而，在处理剂中加入羟基化合物D-葡萄糖酸可以有效降低六价铬的浓度。此外，提出了在三价转化膜上形成六价铬的可能机理。这项研究的发现可以更好地理解三价铬转化膜上六价铬的形成，并且可以促进三价铬处理剂和三价铬紧固件的管理。

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  • 来源
    《Journal of Hazardous Materials》 |2012年第30期|p.56-61|共6页
  • 作者

    Jinhua Li; Chenlan Yao; Yanbiao Liu; Di Li; Baoxue Zhou; Weimin Cai;

  • 作者单位

    School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, PR China;

    School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, PR China;

    School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, PR China;

    School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, PR China;

    School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, PR China;

    School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, PR China;

  • 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);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    hexavalent chromium; trivalent chromium conversion coating; environmental issue; oxidation;

    机译：六价铬三价铬转化膜;环境问题;氧化;

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