Effect of pH and current density in electrodeposited Co–Ni–P alloy thin films

Lew, Kyung Seek; Raja, M.; Thanikaikarasan, S.; Kim, Taegyu; Kim, Yong Deak; Mahalingam, T.

doi:10.1016/j.matchemphys.2008.05.080

Cited by 42 publications

(20 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 7 shows five SEM images of the samples prepared with coating of various pH (7.8, 8.2, 8.6, 9 and 9.4).The pH plays a major role in determining the type of coating (hard or soft magnetic) and controls the coating mechanism [25]. At pH value of 1.5 the coating was found to be having a coercivity of 11937 A/m and at 3.5 pH value the coating had a coercivity of 47747 A/m [24,26]. As can be seen from the images at a pH of 7.8 the Co-Ni-P coating coagulates in some areas rather than forming a uniform coating.…”

Section: Results and Discussion 1) Power Loss Results For Varioumentioning

confidence: 99%

Application of Co–Ni–P Coating on Grain-Oriented Electrical Steel

et al. 2016

View full text Add to dashboard Cite

An electroless plating of Co-Ni-P was applied to a grain-oriented electrical steel substrate resulting in a power loss improvement of approximately 9-11 %. The mean thickness of the coating was found to be 2.15±0.15 µm from Environmental Scanning Electron Microscope (ESEM) images. Shifts of the magnetostriction stress sensitivity curves showed that stress was acting on the substrate corroborated by a shift in X-ray Diffraction (XRD) peaks and narrowing of the domains after the samples were coated. The magnetic property measurement system (MPMS) results confirmed the magnetic nature of the coating and XRD results showed peaks of α-Iron in uncoated sample, α-Iron-Cobalt and α-Iron in Co-Ni-P coated sample. The Talysurf profilometer showed a decrease in surface roughness (Ra) values after coating the sample which reduced the hysteresis loss.

show abstract

Section: Results and Discussion 1) Power Loss Results For Varioumentioning

confidence: 99%

Application of Co–Ni–P Coating on Grain-Oriented Electrical Steel

et al. 2016

View full text Add to dashboard Cite

show abstract

“…Functions of various additives in the plating solution were not the same.To be specific, CoSO 4 ·7H 2 Oand NiSO 4 ·6H 2 O were main salt, NaH 2 PO 2 ·H 2 O, Na 3 C 6 H 5 O 7 ·2H 2 O,KI and SDBS were reducing agent , complexing agent ,stabilizing agent and surfactant respectively,NH 4 F were both buffer and accelerating agent. It was worth mentioning that the buffer property rised When a certain amount of NH 4 Fig.1 showed XRD patterns of the Ni-Co-P alloy coating formed by the electroless methods. Mg diffraction peak was not obvious, and It showed that the coating of Ni-Co-P alloy could completely cover the Mg substrate.…”

Section: Characterizationmentioning

confidence: 99%

“…Electroless deposition offered an alternate and attractive methods of producing a thin and uniform coating ,and it had been known to obtain a Special performance coating when compared to electroplating.Electroless Ni-Co-P alloy had advantages from both Ni-P alloy and Co-P alloy . Ni-Co-P alloy coating possed unique properties such as high coercive force, the smaller residual magnetism, high wear resistance, high corrosion resistance and high density magnetic that were widely used in compact disk, MEMS, surface anti-corrosion, aerospace and other fields [1][2][3][4][5][6] . In the present,main preparation methods consisted of electroless plating method, electroplating method and sputtering method, etc., in which the electroless plating was a common method for obtaining Ni-Co-P alloy.Although the plating rate, stability and bath life subjected to certain restrictions, but because of its simple operation, uniform coating, high density and hardness characteristics, it had been widely used in many fields [7][8][9][10][11] .In this paper, the AZ31B magnesium alloy was used as matrix to make electroless Ni-Co-P alloy under the alkaline conditions.…”

Section: Introductionmentioning

confidence: 99%

Study on Preparation and Property of Ni-Co-P Coatings of AZ31B Magnesium Alloy

Zeng¹,

Zheng²,

Luo³

et al. 2015

Proceedings of the 3rd International Conference on Material, Mechanical and Manufacturing Engineering

View full text Add to dashboard Cite

Abstract. AZ31B was used as the basic material in electroless Plating of Ni-Co-P, The optimium formula and process conditions were obtained by using the orthogonal experiment methods. XRD, SEM and EDS were used to characterize phase structure,compositon and morphology of Ni-Co-P coating. The morphology,corrosion resistance, composition ,hardness,thickness and binding force of coating are measured and analysed. The optimum formula and the technological conditions were gained as follows：26.0g/L NiSO 4 ·6H 2 O ，28.0g/L CoSO 4 ·7H 2 O，24.0g/L NaH 2 PO 2 ·H 2 O，80.0g/L Na 3 C 6 H 5 O 7 ·2H 2 O，60.0g/L NH 4 F ,temperature of 90.0℃,0.001g/L KI, 0.05g/L SDBS ,the plating time of 2.0 h and pH of 8.0.Under this condition, the coating had stronger corrosion resistance, drop time for KMnO 4 solution was 272s; The hardnesses was 229.60HV ;the deposition rate was faster, up to 53.33 g·m -2 ·h -1 ;thickness was 12.43 μm;the surface of the coating was uniform;the distribution of porosity was smaller;there was well-bonded with the substrate.

show abstract

“…Several methods of preparing CoNiFe alloy thin films such as electroless deposition [7], pulsed electrodeposition [8,9], sputtering [10], and electroplating [5,6,11,12] have been reported earlier. Among these methods, electrodeposition appears to be attractive due to its low-cost synthesis, lowtemperature processing, arbitrary substrate shapes, and the possibility to control the film thickness and morphology by readily adjusting the electrical parameters as well as the composition of electrolytic solution [13,14]. Ohashi et al [15] observed that the electrodeposited CoNiFe alloy thin film obtained from sulfate electrolytic bath could be a promising material for high-density magnetic recording heads.…”

Section: Introductionmentioning

confidence: 99%

Structural and magnetic properties of high magnetic moment electroplated CoNiFe thin films

Sundaram

Dhanasekaran

Mahalingam

2011

Ionics

Self Cite

View full text Add to dashboard Cite

CoNiFe alloy thin films deposited at various cobalt concentrations were galvanostatically electrodeposited on the pre-cleaned copper substrates. The effects of cobalt concentration on the structural, compositional, morphological, and magnetic properties of the films were investigated. X-ray diffraction patterns revealed that the deposited films possess polycrystalline in nature with mixed (fcc-bcc) cubic structure at optimized cobalt concentration. Microstructural properties of the films were calculated from predominant diffraction lines. The surface morphology and surface roughness were characterized using scanning electron microscopy and atomic force microscopy, respectively. EDAX results were revealed that the cobalt content increases as nickel content decreases whereas ferrous content initially increases and then eventually decreases in the CoNiFe alloy. VSM results show a higher value of saturation magnetization (4πM s ) above 2 T with coercivity 154 A/m for films deposited in the optimized deposition condition.

show abstract

Effect of pH and current density in electrodeposited Co–Ni–P alloy thin films

Cited by 42 publications

References 22 publications

Application of Co–Ni–P Coating on Grain-Oriented Electrical Steel

Application of Co–Ni–P Coating on Grain-Oriented Electrical Steel

Study on Preparation and Property of Ni-Co-P Coatings of AZ31B Magnesium Alloy

Structural and magnetic properties of high magnetic moment electroplated CoNiFe thin films

Contact Info

Product

Resources

About