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Citation: YU Huicheng, WEI Yichun, HAN Yanyan. Effect of Phenyl Thiourea as a Stabilizer on the Electrochemical Properties of Electroless Ni-P Coatings on 6063 Aluminum Alloy[J]. Chinese Journal of Applied Chemistry, ;2013, 30(6): 683-689. doi: 10.3724/SP.J.1095.2013.20337 shu

Effect of Phenyl Thiourea as a Stabilizer on the Electrochemical Properties of Electroless Ni-P Coatings on 6063 Aluminum Alloy

School of Chemistry and Chemical Engineering, Guangxi University for Nationalities, Nanning 530006, China

Received Date: 1 August 2012
Revised Date: 5 October 2012

Polarization curves and AC impedance spectroscopy were used to investigate the effects of different concentrations of stabilizer phenyl thiourea(PHTU) on the electrochemical properties of electroless Ni-P coatings on a 6063 aluminum alloy. The polarization curves show that the coatings formed in phenyl thioureacontaining electroless nickel solution have a more positive corrosion potential(E_corr) and pitting corrosion potential(E_pit),and a lower corrosion current density(i_corr) than the bare aluminum alloy. To explain the electrochemical properties of the coatings,a simple equivalent circuit is designed. Electrochemical parameters of EIS,such as the surface resistance(R_coat) and capacitance(Q_coat),charge transfer resistance(R_ct) and double layer capacitance(Q_dl),have been obtained by fitting the EIS plots.The EIS results show that the coatings formed in 6~10 mg/L PHTU electroless nickel solution present a higher resistance(R_coat and R_ct) and lower capacitance(Q_coat and Q_dl) values. The EIS and polarization curve results indicate that the prepared coatings have a better corrosion resistance and the EIS and polarization curve results are in agreement with each other. The morphology and composition of the Ni-P coatings have been examined by using a SEM and EDS,respectively. The results show the coating surface is in a uniform state and the mass fraction of P element on the coating surface is more than 10%.
- electroless nickel coating,
- aluminum alloy,
- stabilizer,
- electrochemistry,
- corrosion resistance
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