Rare earth in the non-ferrous metal plating began in the 1980s, the addition of rare earth-based to improve the coating properties, improve the current efficiency point of view starting. Now rare earth additive is not only used in the plating deposition of Cr, Zn, Ni, Cu, elemental metal, also used in the deposition of nickel iron, nickel, zinc, zinc, iron, zinc and aluminum alloy plating additives to the development of a single rare earth compound of rare earth compounds. Rare earth additives to the plating liquid iron, and some rare earth with iron deposition in the coating, coating increased stress and a corresponding increase in the hardness of the coating; rare earth cation adsorption but also on the cathode surface, on the one hand, inhibition of H adsorption and precipitation, thereby inhibition the formation of micro cracks in the coating corrosion resistance to improve the other hand, the analysis of H become more difficult, the deposition rate of Fe relative to the current efficiency is increased. Rare earth additives are widely used in the electroplating industry, from the ordinary plating transferred to the composite plating, hot-dip plating, electric plating, and other special plating. Above containing the industrial production of non-ferrous metal alloys of rare earth have been, and achieved good social and economic effect, but non-ferrous alloys a wide range, therefore, the development potential of rare earth in the non-ferrous metal alloys is very great.
Rare earth additives of the chrome-plated at lower temperatures, higher current efficiency and the dispersion of the chromium plating solution, the coating coverage and corrosion resistance can be significantly improved. Zinc-nickel alloy plating, adding a small amount (about 1 0g / L), cerium sulfate can increase the current efficiency of the bath, so that the Ni content in the coating increased, the Ce-containing coating in high temperature and high pressure salt water has an excellent resistance to corrosion.
Deposited nickel-phosphorus alloy coating in the acidic bath, adding the rare earth ions (La3, Y3) and rare earth oxides (CeO2, Y2O3) composite additives of rare earth ions play a fine grain strengthening and the role of micro-alloying, rare earth oxides to the dispersion strengthening and grain refinement strengthening the role of improved coating hardness, wear resistance, the coating and substrate binding enhancement. Taken together, the rare earth cation in the bath, due to the highly active, you can: (1) cathodic polarization. Rare earth cation adsorption on the cathode surface, improve the cathodic polarization, the analysis of H over potential increases, the corresponding increase in deposition rate and current efficiency of the metal or alloy. (2) Change the electro crystallization process. Rare earth cations are easily adsorbed on the active sites in the crystal growth, the effective inhibition of crystal growth, the coating grain refinement, coating hardness, combined with hydrogen evolution difficult micro crack factorial H reduction, enhanced corrosion resistance.
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