轮胎模具铝质花纹圈化学镀镍磷合金的研究

The Study of Electroless Ni-P Coating on Aluminum Circle Pattern of Tyre Mold

铝制轮胎模具花纹圈硬度低,在使用过程中易磨损,为提高铝质花纹圈的使用寿命,采用正交试验对AC7A铝合金花纹圈表面进行化学镀镍磷合金处理,并利用扫描电子显微镜(SEM)、能谱仪(EDS)及X射线衍射仪(XRD)对镀层进行表征。结果表明,AC7A铝合金表面镍磷合金镀层为非晶态结构,镀层硬度高,耐腐蚀性好;350℃热处理1 h后镀层转化为晶态,硬度得到进一步提高,达HV828,可显著提高花纹圈的使用寿命。

Aluminum circle pattern of tyre mold was easy to be worn when it was used because of its low hardness.In order to improve the service life of the aluminum tyre mold,AC7A aluminum alloy was processed by electroless Ni-P plating under orthogonal experiment.The coating was characterized by Scanning Electron Microscopy（SEM）,Energy Dispersive Spectrometer（EDS） and X-ray Diffractometer（XRD）.The results showed that the electroless Ni-P coating on aluminum alloy was amorphous structure,with high hardness and good corrosion resistance;the structure became crystal structure after heat treatment,and the hardness of the coating was improved,which could reach as high as HV828,and the service life of the aluminum circle pattern were improved.