【摘 要】
：
In this article,the advantages of zinc-nickel alloy electroplating were introduced.It is indicated that the technological key of zinc-nickel electroplating is selection of coordination agents and brig
【机 构】
：
GUANG ZHOU ULTRA UNION CHEMICALS LTD.,GUANG ZHOU,CHINA 510460
【出 处】
：
Fifth International Conference on Surface Engineering(第五届表面工
论文部分内容阅读
In this article,the advantages of zinc-nickel alloy electroplating were introduced.It is indicated that the technological key of zinc-nickel electroplating is selection of coordination agents and brighteners.The requests of coordination agents in the zinc-nickel electroplating baths were summarized,which the zinc-nickel alloy can form; the nickel hydroxide compound [Ni(OH)2] might prevent; the metallic distribution is uniform at different current density.The available coordination agents kind is listed.The coordination agents roles are discussed by thermodynamic and kinetic property.The methods of selecting of coordination agents are inferred:1) the equilibrium constant of formative metallic complex must have medium value,e.g.k=n×108~n×10-16; 2) the formative coordinated nickel complex is provided with electrode surface activity.Finally,the combined coordination agents are recommended that is combination by tartrate with polyamine; or using some polyamine; or adopting organic polyphosphate coordination agent:example HEDP (1-hydroxy Ethylidene-1,1-diphosphonic acid),etc.
其他文献
Ceramic coatings were deposited on AZ31B magnesium alloys by constant current micro-arc oxidation (MAO) in 0.333 mol/L (NaPO3)6 +2 g/L NaOH electrolytes with and without the addition of triethanolamin
Adopting suitable pretreatment,a compact and even nickel-phosphorus alloy coating was obtained on W-Cu alloy by electroless deposition from solutions containing nickel sulphate as a source of nickel a
Because of low mechanical strength,pure magnesium has limited applications and is usually alloyed with some elements such as aluminum,manganese,zinc and rare earth in order to improve its mechanical p
The electroless nickel-phosphor coatings containing molybdenum disulfide nanoparticles were prepared and analyzed in this paper.This composite coating was desired to have the superlubricity of nanosiz
The wear-resistance,corrosion resistance,hardness can be greatly increased by using low temperature QPQ complex salt-bath treatment.And it is a new strengthening method without distortion in the treat
Anodic alumina oxide (AAO) templates with multi-branched structure were fabricated in a phosphoric acid.Atomic force microscope (AFM) was utilized to investigate the unstable growth of porous oxide fi
Studies on the electrodeposition of aluminum on common steel substrate from molten salts based on chlorides were quite extensive.However,there was very little work of deposition aluminum on stainless
The chemical nickel-plating on the surface of the barium zirconate-based piezoelectric ceramic was studied which can replace the traditional technology of the silver-gilt.The effects of pH value of th
A Cr-Co-P alloy electroplating coating was prepared from trivalent chromium bath and the appearance and performances of the coating were characterized.The Cr-Co-P alloy electroplating bath was prepare
The Ag nanoparticles colloid was prepared by pulsed laser ablation for different time in 10 ml distilled water without any surface active agent,and it was analysed by means of UV-visible spectrophotom