Control of SiC Content in Ni-W/SiC Micro-composite Electrodeposits by Adding a Phosphoric Salt
In this study, the conventional citric bath with SiC microparticles (between 1 and 5 μm) containing NaH2PO4·2H2O with the concentration of 0 ~ 20 g/L was used to obtain higher SiC microparticles contents Ni metal matrix composite coatings.The morphology of the coatings was studied by scanning electron microscope (SEM).The SiC contents of the coatings was measured by energy dispersive spectroscopy (EDS) analyzer.The phase compositions of the coatings was analyzed by X-ray diffraction (XRD).The adsorption behavior of SiC microparticles in electrolyte solution was explored by Fourier transform infrared spectroscopy (FTIR).SiC Microparticles contents measurement of the coatings showed up to 42% for the sample produced from the bath with 5 g/L NaH2PO4·2H2O under the current density of 10 mA/cm2 and 10 g/L SiC microparticles concentration.SiC in the electrolyte formation electrified micelle due to extremely small ionization constant between metal ions and anions, and interaction among metal ions and anions of adsorption, therefore, this electrified micelle movement under the action of electricity had enormous impulse that was converted into energy which can greatly promote SiC microparticles with metal co-deposition when collision electrode, so the SiC microparticles concents in Ni metal matrix composite coatings were further increased.Ni-W/SiC electrodeposits were prepared in the conventional citric bath for Ni-W alloys by adding SiC microparticles.A phosphoric salt of NaH2PO4 was also used to further improve the SiC content in the electrodeposits.It was found that the SiC microparticles absorbed a phosphoric salt of NaH2PO4.The Fourier transform infrared spectroscopy shown that in 1131.63 cm-1 has the stretching vibration absorption peak of P=O double bond and in 1068.38 cm-1 has the stretching vibration absorption peak of Si-C single bond.The SiC particles suspended in the nickel electrolytes needed positive zeta potential values, one reason was that the positive zeta potential offers an extra adhesion force between the inert particles and the cathode and results in increasing the amount of the embedded SiC particles.For electrodeposition of Ni-W/SiC microcomposites in plating bath with NaH2PO4, the anion may increase the absorption of positive nickel ion onto SiC particles, leading to an enhanced SiC concentration in the deposits.
Ni-W/SiC composite coatings metal co-deposition phosphoric salt
HOU Jianping SU Changwei BAI Yang WANG Yan GUO Junming
Key Laboratory of Resource Clean Conversion in Ethnic Regions, Education Department of Yunnan, Yunna School of Chemistry and Environment, Yunnan Minzu University, Kunming, Yunnan, 650500, PR China
国际会议
the 2016 International Seminar on Advanced Materials Research(2016先进材料研究国际研讨会)
昆明
英文
382-389
2016-10-14（万方平台首次上网日期，不代表论文的发表时间）