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    190301-新型碱性无氰镀镉工艺及其镀液与镀层性能

       作者:郭崇武    单位:广州超邦化工有限公司    日期:2019-02-26     浏览:125    评论:0    
    提示:中文核心期刊,中国科技核心期刊!DOI: 10.19289/j.1004-227x.2019.03.001新型碱性无氰镀镉工艺及其镀液与镀层性能郭崇武(广州
     

    中文核心期刊,中国科技核心期刊!   


    DOI: 10.19289/j.1004-227x.2019.03.001

    新型碱性无氰镀镉工艺及其镀液与镀层性能

    郭崇武(广州超邦化工有限公司,广东 广州 510460)

    摘要:开发了碱性无氰镀镉新工艺。镀液中含氯化镉25 ~ 35 g/L、配位剂90 ~ 140 g/L、氯化钾140 ~ 180 g/L、光亮剂1.5 ~ 2.5 mL/L和辅助剂25 ~ 35 mL/L,pH 为7.5 ~ 8.5,温度20 ~ 35 °C。对于挂镀,阴极电流密度为0.5 ~ 1.5 A/dm2;对于滚镀,槽电压为5 ~10 V,滚筒转速为4 ~ 8 r/min。在1.0 A/dm2 下电镀,镉的沉积速率约为0.35 μm/min。该工艺的电流效率为70%左右,均镀能力为43% ~ 59%,深镀能力为8.3,热震结合力合格。镉镀层经过低铬彩色钝化后进行中性盐雾试验1 000 h,无白锈生成。弯曲测试结果表明,厚度为36 μm 左?#19994;?#38217;镀层也具有良好的柔软性。

    关键词:碱性无氰镀镉;沉积速率;电流效率;均镀能力;深镀能力;结合力;耐蚀性

    ?#22411;?#20998;类号:TQ153.17 

    文献标志码:A

    文章编号:1004 – 227X (2019) 03 – 0097 – 04

    A novel alkaline cyanide-free cadmium plating process and properties of its bath and coatings // GUO Chong-wu

    Abstract: A novel alkaline cyanide-free cadmium plating process was developed. The bath is composed of cadmium chloride 25-35 g/L, complexing agent 90-140 g/L, KCl 140-180 g/L, brightening agent 1.5-2.5 mL/L, and auxiliary agent 25-35 mL/L with a pH of 7.5-8.5 and operated at 20-35 °C. For rack plating, the cathodic current density is 0.5-1.5 A/dm2;for barrel plating, the bath voltage is 5-10 V and the barrel rotation rate is 4-8 r/min. The deposition rate of cadmium is ca.0.35 μm/min at 1.0 A/dm2. The bath features a current efficiency of ca.70.3%, a throwing power of 43%-59%, a covering power of 8.3, and a satisfactory adhesion strength (thermal shock resistance). The cadmium coatings treated by lowchromium iridescent passivation is able to endure a neutral salt spray test for 1 000 h without the formation of white rust.The blending test result showed that even a 36.3 μm-thick cadmium coating had good flexibility.

    Keywords: alkaline cyanide-free cadmium plating; deposition rate; current efficiency; throwing power; covering power;adhesion; corrosion resistance

    Author’s address: Guangzhou Ultra Union Chemicals Ltd., Guangzhou 510460, China

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