Abstract
Abstract Coatings containing Fe-Si particles were electrodeposited on 3.0wt% Si steel sheets under magnetic fields. The effects of magnetic flux density (MFD), electrode arrangement and current density on the surface morphology, the silicon content in the coatings and the cathode current efficiency were investigated. When a magnetic field was applied parallel to the current and when the MFD was less than 0.5 T, numerous needle-like structures appeared on the coating surface. With increasing MFD, the needle-like structures weakened and were transformed into dome-shaped structures. Meanwhile, compared to results obtained in the absence of a magnetic field, the silicon content in the coatings significantly increased as the MFD was increased for all of the samples obtained using a vertical electrode system. However, in the case of an aclinic electrode system, the silicon content decreased. Furthermore, the cathode current efficiency was considerably diminished when a magnetic field was applied. A possible mechanism for these phenomena was discussed.
Highlights
Silicon steel containing 6.5wt% Si has attracted considerable interest because of its high permeability, high saturation magnetization, and nearly zero magnetostriction [1 4]
Compared to the smooth surface morphology in the absence of a magnetic field (Figs. 2(a) 2(c)), numerous needle-like structures appeared on the Fe–Si coating surface at 0.1 T (Figs. 2(d)–2(f) and 2(d1)–2(f1))
In such a sulfate–chloride plating bath, the electrodeposition of Fe–Si composite coatings was conducted in a magnetic field at 30°C
Summary
Silicon steel containing 6.5wt% Si has attracted considerable interest because of its high permeability, high saturation magnetization, and nearly zero magnetostriction [1 4]. Many researchers [11 13] have reported that the application of a magnetic field can significantly facilitate the incorporation of applied particles into the coatings. Yamada and Asai [14 15] observed that micron-grade Al2O3 particles distributed in a Ni matrix in a honeycomb pattern when a parallel magnetic field was superimposed on them. The magnetic field gradient force is considered to be another factor affecting the electrodeposition process [16 17]. Zhou et al [20] electroplated iron with nano-Si particles in a vertical electrode system under a parallel magnetic field and observed that the Si particles distributed on the coating surface in a striped pattern under the interaction of the MHD effect and natural convection. We wondered about the effect of applying a magnetic field during electrodeposition of iron with Fe–Si particles
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