Magnetically Induced Codeposition of Ni鈥揅d Alloy Coatings for Better Corrosion Protection

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• 作者：Vaishaka R. Rao ; Ampar Chitharanjan Hegde
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：April 2, 2014
• 年：2014
• 卷：53
• 期：13
• 页码：5490-5497
• 全文大小：397K
• 年卷期：v.53,no.13(April 2, 2014)
• ISSN：1520-5045

文摘

The effects of applied magnetic field, B (both parallel and perpendicular) during process of electrodeposition of Ni鈥揅d alloy coating on mild steel from a newly proposed electrolytic bath have been studied by using X-ray diffraction (XRD), energy-dispersive X-ray (EDX), and scanning electron microscopy (SEM) analysis. Both parallel and perpendicular B reduced the corrosion rates (CRs); however, the effect is more pronounced in case of perpendicular B. Progressive decrease of CR with increase in the intensity of B showed that corrosion protection efficacy bears close relation with changed composition and crystallographic orientation of the coatings. Under optimal condition, Ni鈥揅d coating deposited at 0.8 T (perpendicular) was found to be 35 times less corrosive than the conventional Ni鈥揅d coating (B = 0 T) deposited from the same bath for same time. The effect of B on thickness, microhardness, surface morphology, composition, and crystallographic orientation, and hence, the corrosion resistance of the coatings were analyzed in the light of magnetohydrodynamic (MHD) effect.