Studies on electroless Ni-P-Cr_2O_3 and Ni-P-SiO_2 composite coatings

本文对化学镀镍及化学镀镍磷基质中SiO2与Cr2O3的共沉积进行了研究。微粒在不断生长的膜层中共沉积引起了新的化学复合镀层的出现,这些复合镀层许多都具有优异的耐磨及耐蚀性能。通过选取镀层合金/复合微粒/金属基体的组分可改进镀层,获得所需的性能,以满足特别的需求。在对这些复合镀层的应用需求正在迫近与增长的同时,其市场正在迅速扩张。本文开发出了一种合适的复合化学镀镍液,并通过维氏硬度法对化学复合镀镍层进行了表征。采用动电位极化及交流阻抗法测定了镀层的Taber耐磨性能及耐蚀性能。采用SEM及XRD对复合镀层的表面形貌进行了分析。

This article presents the studies of electroless nickel followed by incorporation of SiO2 and Cr2O3 ,in electroless Ni-P matrix. The co-deposition of particulate matter within the growing film has led to a new invention of electroless composite coatings, many of which have excellent wear and corrosion resistance. Coatings can be modified for desired properties by selecting the composition of the coating alloy/composite/metallic to suit specific requirements. The market for these coatings is expanding fast as the impending applications are on the rise. In the present paper, an effort has been made to develop a suitable bath for the codeposition of composite particles in the electroless nickel plating process and the deposits were characterized by Vicker ＂s hardness method, Taber abrasion resistance and corrosion resistance of the coatings by potentiodynamic polarization and A. C impedance measurements. The surface morphology of the composite coatings were analysed by SEM and XRD measurements.