Acta Phys. -Chim. Sin. ›› 2001, Vol. 17 ›› Issue (11): 1053-1056.doi: 10.3866/PKU.WHXB20011119

• Note • Previous Articles    

Preparation of Amerphous Alloys of Nickel with Lanthanum,Cerium by Electrodeposition and Crystallization Kinetics

Dong Jun;Shi Hong-Yun;Deng Jie;Zhang Yun-Qian   

  1. Department of Chemistry,Guizhou University,Guiyang 550025
  • Received:2001-04-18 Revised:2001-08-10 Published:2001-11-15
  • Contact: Shi Hong-Yun E-mail:hyshi@tmail.gzu.edu.cn

Abstract: Rare-earth elements (La,Ce) have lower standard equilibrium potentials than that of hydrogen and are very difficult to electrodeposite from aqueous solution. Ni-La,Ni-La-P,Ni-Ce,Ni-Ce-P and Ni-P alloys deposits were obtained from aqueous solutions by using optimized electroplaing solutions and process conditions. The experimental results show that these alloys (except Ni-Ce) have amorphous structure. The crystallization kinetics of these amorphous alloy coatings were investigated. The crystallization activation energy and kinetic equation of four kinds of amorphous coatings have been determined by DSC method.The results indicate that the crystallization activation energy of Ni-P,Ni-La,Ni-La-P,Ni-Ce-P amorphous coatings are 200.3,360.8,517.7,420.5 kJ•mol-1 respectively.The crystallization kinetics of the four kinds of amorphous coatings may be expressed by the following equation:

Key words: Rare-earth (La,Ce) Ni Alloys, Amorphous coating, Electrodeposition,  Crystallization kinetics