Effect of Particle Conductivity on Fe-Si Composite Electrodeposition

doi:10.1007/s40242-014-4096-9

Abstract

Abstract:

Coatings containing Fe-Si or Si particles were electrodeposited on 3.0%(mass fraction) Si steel sheets. The surface morphology, the cross-section and the silicon content of coating have been investigated, respectively. It was found that the number of particles on the coating surface and cross-section significantly decreased with increasing silicon content in the applied particles, leading to a decrease of the silicon content of coatings. About 10.2% silicon content of coatings deposited with Fe-30%Si particles can be obtained, whereas that for Si particles was only 2.9% at a particle concentration of 100 g/L and current density of 2 A/dm². This is mainly attributed to the conductivity of applied particles. High conductivity can promote the co-deposition of the particles. With increasing silicon content in the particles, their conductivity decreased sharply, resulting in the decrease of silicon content of coatings. Present work may initiate a new method to modify the particle content of the composite coatings via changing the conductivity of the particles during the composite electrodeposition. In this paper, a possible mechanism was proposed to explain the phenomena.

Key words: Composite electrodeposition, Conductivity, Fe-Si particle, 6.5% Silicon steel

LONG Qiong, ZHONG Yunbo, ZHENG Tianxiang, LIU Chunmei. Effect of Particle Conductivity on Fe-Si Composite Electrodeposition[J]. Chemical Research in Chinese Universities, 2014, 30(5): 811-816.

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