ABS塑料表面无钯化学镀镍新工艺

A Novel Technology for Palladium-Free Electroless Nickel Plating of Acrylonitrile Butadiene Styrene Plastics

为了解决贵金属化学镀工艺中活化成本高和环境污染重的问题,利用废弃的碱性镀镍液和有机添加剂A制得了胶体镍盐活化液,用KBH4将其中的镍离子还原为金属镍作为活化中心,诱导ABS塑料表面无钯化学镀镍。讨论了活化时间、温度、pH值对活化效果的影响,对镀层的结合力、耐蚀性、表貌形貌及组成进行了表征。结果表明:胶体镍盐活化液pH值为8左右,活化温度50℃,活化时间2～3 min,活化效果显著;镀层平整、光亮,结合力好,耐蚀性高。本工艺操作简单,绿色环保,成本低廉,具有一定的应用价值。

Discarded basic solution for nickel electroplating was doped with an organic additive A to generate Ni salt colloid as an activation solution. KBH4 was used to reduce Ni2+ ions in the activation solution, generating metallic Ni as ac-tivation centers for inducing Pd-free electroless Ni plating of acry-lonitrile butadiene styrene (ABS) plastics. The effects of activa-tion time, temperature, and pH value on the activation efficiency were investigated. The morphology, composition, adhesion to substrate, and corrosion resistance of the electroless Ni coating were studied based on analyses of scanning electron microscopy ( SEM) and energy dispersive spectrometry ( EDS) and corrosion test. Results show that Pd-free activation process has the advan-tages of simple manipulation, low cost, and environmental ac-ceptability, and it can be well used for activation of electroless Ni plating of ABS plastics. The resulting Ni - P coating is smooth and bright and has good adhesion to substrate and corrosion resistance as well.