Magnetically Induced Codeposition of Ni–Cd Alloy Coatings for Better Corrosion Protection

Abstract

The effects of applied magnetic field, B (both parallel and perpendicular) during process of electrodeposition of Ni–Cd 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–Cd coating deposited at 0.8 T (perpendicular) was found to be 35 times less corrosive than the conventional Ni–Cd 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.

Impact of Magnetic Field Direction on Performance and Structure of Ni-Co-SiC Coatings Fabricated via Magnetic-Field-Induced Electrodeposition

“…(2) The MHD effect facilitates electrolyte mixing that proves advantageous for detaching hydrogen bubbles adhered to the surface of the cathode and reducing concentration polarization. This conclusion corresponds to the findings reported by Rao et al [18]. (3) Microscale vortex convection occurs when the electric and magnetic fields are parallel to each other, improving the electrolyte's mass transport [19].…”

Influence of constant magnetic field on electrodeposition of metals, alloys, conductive polymers, and organic reactions

“…The same researchers in 2014 [48] investigated the effects of magnetic field on Ni-Cd alloys electrodeposited at the constant current density on mild steel. They found, as in the case of the Zn-Ni alloy, that perpendicular and parallel (to the surface of the working electrode) magnetic fields affect the character of the alloy to a greater extent.…”

Low-Energy Electrodeposition of Nickel in Electroplating Wastewater Using a Water Hyacinth Separated Double Chamber Electrodeposition Cell

“…Some researchers have already looked into how to get a nickel out of industrial waste using methods like electrodeposition tests with a single-chamber electrolytic reactor and an electrolytic membrane reactor (also known as a partitioned reactor). 25,26 Zhu et al (2015) conducted research in a 1000-ml single chamber electrodeposition reactor with titanium or graphite plates as anode and stainless steel as cathode, with a voltage input of 40 V and in the presence of NaOH and H 2 SO 4 . 27 After a 6 h operation, there was a deposit of 0.07 grams of nickel metal from an initial nickel concentration of 20 g l −1 .…”