Electrodeposition of CoNiFe Alloys on n-Type Silicon

2012

AMR

Cobalt and its alloy have been identified as potential candidates for replacing hexavalent Chromium plating in corrosion resistant coating in acidic environment. In this study, the effect of alloys addition towards elemental composition, crystallographic structure characterization, surface morphology, hardness and potentiodynamic polarization of the cobalt alloys coatings is reported. Addition of Nickel (Ni) and Iron (Fe) to the Cobalt (Co) coatings are deposited on stainless steel substrate by electrodeposition method. The deposition is performed at acidic environment of pH 3. The granule sizes of cobalt alloys prepared by electrodepositionmethod are in the range of 34.95 nm72.08 nm. The microhardness of CoNiFe is the highest (267.8 HV) compared to Co and CoFe. CoNiFeperforms the smallest corrosion rate with 1.322 mmpy. It is found thatthe addition of Ni and Fe into pure cobaltimproves the hardness and corrosion behavior.

Section: Methodsmentioning

confidence: 99%

Study of Alloys Addition to the Electrodeposited Nanocrystalline Cobalt

2012

AMR

“…The properties of the nanocrystalline materials can be enhanced by optimize the operating parameters such as pH, temperature, current density, time deposition, bath additives and electrolyte composition. Nanocrystalline CoFe is a very beneficial nanomaterial due to its enhanced corrosion resistance, magnetic and thermophysical properties [4]. CoFe is found to be a potential material for the acidic corrosive environment.…”

Section: Introductionmentioning

confidence: 99%

Effect of Time Depositions on Electrodeposited Cobalt-Iron Nanocoating

et al. 2012

AMR

Cobalt-Iron (CoFe) nanocrystalline coatings are successfully prepared in 30, 60 and 90 minutes time depositions using electrodeposition method. The effect of time deposition towards crystallographic structure, elemental composition, surface morphology, microhardness and corrosion behaviour of CoFe coatings were investigated. The CoFe nanocrystalline coatings were deposited on stainless steel substrate at pH 3 environment. The grain sizes of the coatings are in the range of 57.88 to 70.18 nm. The CoFe nanocrystalline coating prepared at 90 minutes deposition achieves the highest microhardness of 290 HV. This coating also exhibits the lowest corrosion rate with 1.086 mpy. It is found that the increment of time deposition improves the microhardness and corrosion behavior of CoFe nanocrystalline coatings.

“…The graphite electrode was used as the anode while the cathode was the copper plate. The bath composition contained a mixture of 0.075M CoSO 4 , 0.03M FeSO 4 , 0.4M H 3 BO 3 , 0.01M saccharine, 0.5M Sodium Chloride (NaCl) and 0.05M ascorbic acid [10,11]. Saccharine was used as the refinement agent while H 3 BO 3 acted as the pH buffer.…”

Section: Methodsmentioning

confidence: 99%

Co-Fe Nanoparticles Coated on Copper Substrate: Effect of Different Deposition Times

et al. 2013

AMM

Electrodeposition method has been effectively applied to the synthesis of the Cobalt-Iron (Co-Fe) nanoparticles on Copper (Cu) substrate. The electrodeposition was conducted in acidic environment at controlled temperature of 50°C±0.5°C. The influence of deposition times (30, 60 and 90 min) towards the characteristics and properties such as phase and crystallographic structure, surface morphologies, particle size and magnetic properties of Co-Fe nanoparticles were studied. The Co-Fe phase showed the Body Centered Cubic (BCC) crystal structure. Dendritic structure was visible in the Co-Fe nanoparticles prepared at 30 minutes deposition. Meanwhile, irregular particles surrounded by flakes were found in the sample prepared at 90 min deposition. The particle sizes were reduced from 61.6 nm to 54.8 nm when the deposition time was increased. The best soft ferromagnetic properties with higher saturation magnetization, Ms and lower coercivity, Hc were achieved by Co-Fe nanoparticles deposited at 90 min.