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热处理技术发展和热处理行业市场的分析
时间: 2017-03-14 08:43:47来源: 无锡市奕珺金属改性技术有限公司

  浅谈qpq处理

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对气体渗碳和用渗碳气氛加氨的气体碳氮共渗和氮碳共渗后排出的废气应经点燃后才可无害排放;离子渗硼中不可使用剧毒的B2H6(乙硼烷);对盐浴中不可使用受热要分解产生氰根的黄血盐和赤血盐;对含碳酸盐的盐浴不可使用尿素或缩二脲,因为它会反应生成氰酸盐,后分解为氰盐。对含S和Li的氰酸盐—碳酸盐盐浴可使氰化物保持在0.1~0.8%的低水平,处理零件的渗氮后性能良好,且处理周期缩短,这工艺在美、欧和日本应用相当多,法国HEF公司的SURSULF工艺及处理后进入氧化盐浴属于这种技术,(我国的LT硫氮碳共渗法也是)。在氰酸盐浴中添加有机聚合物melon也可将氰盐含量降到2%~3%,其余大部分是无毒的氰酸盐,法国HEF公司的德国Durferrit子公司(原属Degussa公司)的Tufftride / Melonite / Tenifer / QPQ处理盐浴属于此类技术,(我国成都工具研究所的QPQ盐浴处理也是)。清洗水中的氰含量已经稀释可无害排放。尽管如此,法、德和日本对这些工艺的无公害处理十分严格,并研究废盐的再生。对高速钢刃具淬火仍采用的BaCl2盐浴和含BaCl2废水须经无害化处理达标后才允许排放,德国已采用专门技术和装置来解决。

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