Papers by Keyword: Electroless Silver Plating

Abstract: Electroless silver plating on the surface of fly ash cenospheres was prepared by slowly adding the solution of AgNO₃ into the mixed solution of D-glucose solution and alkaline solution after thermo-alkaline treatment. The morphology and composition of the silver-coated fly ash cenospheres composite powders were observed and analyzed by using SEM, EDS and XRD, and the influence of pH, loading quantity on silver plating was invested. The results revealed that, with the pH value of plating solution increasing, the precipitation of silver is improved, but led to self-accelerating decomposition if too high, and the influence of loading quantity on silver relative content and electro-conductivity of composite powders is very great. The silver shell of composite particles is even and compact when the pH value is 12.57 and the loading quantity is 4g/L, which resistivity can reach to 0.05Ω•cm.

Abstract: The Ag coating was deposited on the surface of Al-Ag alloy powder by electroless plating process. 10 wt% of AgNO3 was put in the powder for precursor replacement reaction, and then added the powder into electroless plating bath which contained glucose solution, solution of silver ammonia, thiourea solution, tartaric acid solution and absolute ethanol. The effects of formula components were analyzed. The surface morphology of the prepared composite particles was studied with SEM and their chemical compositions were confirmed by XRD. With the chemical etching method, silver content of the powder was determined. The studies have shown that an uniform, complete and dense silver coating for the Al-Ag composite powders was generated by this method, with the silver content being 20wt%, and the conductivity was favorable.

Abstract: Antibacterial properties of compound coatings by Micro-arc oxidation and electroless silver plating were reached. Effects of main salt, reducing agent, complexing agent and solution pH on plating rate and solution stability were discussed. The surface morphology and antibacterial properties of compound coatings were analyzed. Bonding strength between compound coatings was tested by tensile peeling method. The results show that compound coatings have good antibacterial effects, the average bonding strength of compound coatings is higher than 22.6 MPa, and compound coatings are firmly bonded.

Abstract: A new kind of the micron-sized flaky silver-coated copper powder was prepared by electroless silver plating in this paper. Its plating structures were characterized by XRD, SEM and EDS. And a new kind of the electromagnetic shielding composite coatings containing 60 wt% the micron-sized flaky silver-coated copper powders and 40 wt% epoxy resin was prepared. Its electromagnetic shielding properties were analyzed by coaxial transmission line equipment. The study results show the micron-sized flaky silver-coated copper powders are composed of 91.35 wt% Cu and 8.65 wt% Ag and have high width-thickness ratio and crystal structure characteristics. In the frequency range of 0.3-1000 MHz, the shielding effectiveness of the coatings is up to 70.15-77.46 dB and increased an average of 22.18 dB compared with the coatings containing 60 wt% micron-sized flaky copper powders when the coating layer thickness is 300 μm. It is seen that the electroless silver plating method effectively improves the inoxidizability, conductivity and electromagnetic shielding properties of copper powders.

Abstract: Silver-plated textiles have exhibited their specific features not only on mechanical performance but also on functional properties. In this study, silver plating technique was applied on cotton fabric to improve its functional properties, especially the anti-bacterial and anti-UV properties. Silver plating was conducted in this research with the aid of oxygen and argon low-temperature plasma (LTP) pre-treatment on the cotton fabric to manipulate the film of the coating. The silver-plated cotton fabric was characterized in terms of its functional properties. The micro-roughness formed on the cotton fabric after the LTP pre-treatment facilitated the silver particles deposition. As a result, the anti-bacterial and anti-UV properties of the silver-plated cotton fabric and the water repellent ability of the cotton fabric were improved after the silver-plating process.