Ni-P-纳米TiO2（溶胶）化学复合镀及镀层防腐蚀性能研究

TL;DRAbstract

In order to improve the deposition rate and corrosion resistance of Ni-P-nano-TiO2 (sol) electroless composite coatings, the effects of process, complex and content of nano-TiO2 (sol) on the deposition rate, corrosion resistance and pitting corrosion potential of Ni-P-nano-TiO2 (sol) electroless composite plating were studied by using weightloss methods, magnetic thickness gauge and electrochemical methods. The results indicated that the optimum formula and process composed of 25.0 g/L NiSO4•6H2O, 25.0 g/L NaH2PO2•H2O, 15.0 g/L NaAc, 15.0 g/L H3BO3, time of 1 h, pH value of 5.5~6.5, temperature of 80 ℃, rotation rate of 100 r/min, and nano-TiO2 (sol) 12.5 mL were acquired. Then, traditional complex lactate may be replaced by H3BO3. Finally, it was shown that the corrosion resistance of the Ni-P-nano-TiO2 (sol) electroless composite coatings increased 10 times, compared with that of electroless coatings Ni-P in salt corrosion media, and 2 times in alkaline corrosion media.

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