Abstract: Rare-earth elements (La, Ce) have lower standard equilibrium potential than hydrogen and are very difficult
to electrodeposition from aqueous solution. Co-La, Co-La-P, Co-Ce, Co-Ce-P and Co-P alloys deposits having amorphous structure were obtained from aqueous solutions by
using optimized electroplaing solutions and process conditions. The crystallization kinetics of these amorphous alloy coatings was
investigated. The crystallization activation energy and kinetics equation of five kinds amorphous coatings were determined
by DSC method. The results indicate that the crystallization activation energy of Co-P, Co-La, Co-Ce, Co-La-P, Co-Ce-P amorphous
coatings are 185.7,386.5, 383.0, 587.3, 535.5kJ·mol^-1 respectively. The crystallization mechamism of four kinds amorphous coatings may be expressed
by kinetics equation:
(dα/dT=（A/Φ)e^-E/RT(1-α)

Key words: rare-earth （La, Ce） Co alloys, amorphous coating, electrodepositionrystallization kinetics