Effect of Bath Compositions on the Properties of Electroless Ni-Cu-P Alloys on Aluminum

2011 ◽  
Vol 117-119 ◽  
pp. 1276-1279 ◽  
Author(s):  
Xi Ran Wang ◽  
Xin Gang Hu ◽  
Wei Yuan Li
Keyword(s):  
Corrosion Resistance ◽  
Electroless Plating ◽  
Sodium Citrate ◽  
Nickel Sulfate ◽  
Sodium Hypophosphite ◽  
Micro Hardness ◽  
X Ray ◽  
Plating Method ◽  
The Matrix ◽  
Electroless Ni

In this work, the electroless plating Ni-Cu-P on aluminium is obtained successfully by direct Ni-Cu-P plating method. The effect of bath compositions on the electroless plating rate and the properties of the electroless Ni-Cu-P deposits was studied by orthogonal test. The corrosion resistance, hardness, surface morphology and components of the coating were studied by using electrochemical workstation, digital micro-hardness SEM and EDS. The optimum bath formula obtained is 0.6g/L copper sulfate, 30g/L nickel sulfate, 35g/L sodium citrate, 25 g/L sodium hypophosphite, 20g/L acetic anhydride and right amount of self-made additive. The deposition rate, hardness and corrosion resistance are all good. The adhesion between the deposits and the matrix is better. The deposits is smooth and uniformity, smooth by SEM. The deposit contains Ni 78.90%, Cu 8.65%, P 12.46% by the analyses of energy disperse X-ray.

The Influence of Plating Temperature on the Properties of Electroless Ni-Cu-P Alloys on Aluminum

2011 ◽  
Vol 189-193 ◽  
pp. 1096-1099
Author(s):  
Xi Ran Wang ◽  
Hui Lu ◽  
Ying Wei Zhang ◽  
Xin Gang Hu ◽  
Jing Wu
Keyword(s):  
Corrosion Resistance ◽  
Surface Morphology ◽  
Deposition Rate ◽  
Electroless Plating ◽  
Micro Hardness ◽  
Optimal Temperature ◽  
X Ray ◽  
The Matrix ◽  
Electroless Ni

In this work, the effect of plating temperature on the electroless plating rate and the properties of the electroless Ni-Cu-P deposits was studied. The corrosion resistance, hardness, surface morphology and components of the coating were studied by using electrochemical workstation, digital micro-hardness SEM and EDS. The results show that the optimum plating temperature is 75°C. The deposition rate, hardness and corrosion resistance are all good when the optimal temperature is 75°C. The adhesion between the deposits and the matrix is better. The deposits is smooth and uniformity, smooth by SEM. The deposit contains Ni 77.80%, Cu 7.68%, P 14.52% by the analyses of energy disperse X-ray.

Synthesis and Properties of Electroless Ni-P-W/Nano-Al2O3 Composite Coatings Deposited on Sintered NdFeB Permanent Magnet

2011 ◽  
Vol 306-307 ◽  
pp. 901-906 ◽  
Author(s):  
Huan Ming Chen ◽  
Ya Hong Gao ◽  
Qiong Lv ◽  
Dong Yang ◽  
Xin Xin Lin
Keyword(s):  
Corrosion Resistance ◽  
Permanent Magnet ◽  
Composite Coatings ◽  
Alloy Coating ◽  
X Ray Diffraction ◽  
Ndfeb Magnet ◽  
X Ray ◽  
Plating Method ◽  
Ndfeb Permanent Magnet ◽  
Electroless Ni

The Ni-P-W/nano-Al2O3composite coatings were deposited on the surface of sintered NdFeB permanent magnet by electroless plating method. The morphology and the phases of Ni-P-W/nano-Al2O3composite coatings were investigated using scanning electron microscopy and X-ray diffraction respectively. The hardness and the corrosion resistance of the composite coatings were also tested. The results indicated that the composite coatings morphology appears closely nodules morphology, and the microhardness increases with increasing incorporation of Al2O3ratio. Compared with NdFeB magnet and Ni-P-W alloy coatings, the corrosion resistance of the composite coatings was superior to that of the NdFeB magnet and the alloy coating obviously.

scholarly journals Optimization of the Corrosion Resistance of Electroless Ni–W–P Coatings on Magnesium Alloys by the Response Surface Methodology

Coatings ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 18
Author(s):  
Bin Liu ◽  
Qing Zhang ◽  
Yang Li ◽  
Yuebo Yang ◽  
Tao Zhang ◽  
...  
Keyword(s):  
Response Surface Methodology ◽  
Corrosion Resistance ◽  
Response Surface ◽  
Magnesium Alloys ◽  
Sodium Tungstate ◽  
Nickel Sulfate ◽  
Bath Temperature ◽  
Sodium Hypophosphite ◽  
Technological Parameters ◽  
Electroless Ni

Plating processes greatly affect the corrosion resistance of electroless Ni–W–P coatings on magnesium alloys. In the present research, the corrosion resistance of electroless Ni–W–P alloy-coated AZ91D magnesium alloy was optimized by the response surface methodology. The optimum technological parameters of the plating process were determined by establishing a quadratic regression model, and the influence of these variables and their interactions on the corrosion resistance of the coating was analyzed. The optimum technological parameters of the electroless plating process were nickel sulfate concentration = 20 g/L, sodium tungstate concentration = 15 g/L, sodium hypophosphite concentration = 30 g/L, bath temperature = 60 °C, and bath pH = 9.3. Under these conditions, the coating had the best corrosion resistance. Among the aforementioned five variables, sodium tungstate concentration had the most significant influence on the corrosion resistance of the coating. Different degrees of interactions among the variables greatly affected the corrosion resistance of the coating.

The Influence of Complexing Agent to the Function of Electroless Plating of P-Ni Alloy on Magnesium Alloy

2010 ◽  
Vol 146-147 ◽  
pp. 327-330
Author(s):  
Yan Fang Chen ◽  
Xue Tao Yu ◽  
Yan Jie Qi ◽  
Ming Yue Ma ◽  
Qing Hua Chang
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Electroless Plating ◽  
Sodium Citrate ◽  
Complexing Agent ◽  
Az31b Magnesium Alloy ◽  
Ni Alloy ◽  
The Matrix ◽  
Buffering Agent ◽  
Scanning Electron

To improve the corrosion resistance and wear resistance of AZ31B magnesium alloy, in this dissertation, we use the method making AZ31B magnesium alloy as the matrix to make coating on the way of electroless plating nickel-phosphor directly. In this study, we make experiments on the influence of concentration of complexing agent in electroplating to electroless plating on the surface of magnesium alloy. We utilize the scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and the detection of corrosion resistance etc. To analyze the morphology, composition and corrosion resistance of coating. We come to a conclusion that the reaction is at the soonest when we adopt sodium citrate as buffering agent and its density is10ml/L., meanwhile, the coating particle is tiny and is well-knit with matrix. What’s more, phosphorus contents are maximum and the corrosion resistance is greatest.

scholarly journals Prediction and parametric optimization of surface roughness of electroless Ni-Co-P coating using Box-Behnken design

2019 ◽  
Vol 28 (1) ◽  
pp. 153-161 ◽  
Author(s):  
Subhasish Sarkar ◽  
Arghya Mukherjee ◽  
Rishav Kumar Baranwal ◽  
Jhumpa De ◽  
Chanchal Biswas ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Parametric Optimization ◽  
Bath Temperature ◽  
Sodium Hypophosphite ◽  
X Ray Diffraction ◽  
Box Behnken Design ◽  
X Ray ◽  
Xrd Study ◽  
Roughness Analysis ◽  
Electroless Ni

AbstractThe current study focuses on the parametric optimization of electroless Ni-Co-P coating considering surface roughness as a response using Box-Behnken Design (BBD) of experiment. The two bath parameters namely the concentration of cobalt sulphate and sodium hypophosphite were varied along with the bath temperature to predict the variation in surface roughness. Analysis of variance (ANOVA) method has been applied to determine the interactions of the substantial factors which dominate the surface roughness of the coating. The process parameters for surface roughness of the coating were optimized by successfully utilizing the statistical model of Box-Behnken Design (BBD) of experiment. From the BBD model, the optimum condition for the deposition of the coating has been evaluated. In that specific condition, the surface roughness of the as-deposited coating is found to be 0.913μm. Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Spectroscopy (EDX), and X-Ray Diffraction (XRD) study have been utilized to characterize the electroless Ni-Co-P coating deposited in optimized condition.

Influence on Rare Earth Re3+ by the Performance of Composite Brush Plating of Ni-P

2014 ◽  
Vol 940 ◽  
pp. 7-10
Author(s):  
Zhong Bao Jiang ◽  
Yu Feng Zhang ◽  
Shao Li Duan ◽  
Shou Liang Cao
Keyword(s):  
Corrosion Resistance ◽  
Rare Earth ◽  
Sodium Citrate ◽  
High Hardness ◽  
Abrasive Resistance ◽  
Binding Force ◽  
Plating Method ◽  
Low Phosphorus ◽  
Brush Plating ◽  
Plating Layer

Using the sodium citrate as ligands and adopting electric brush plating method, Re will be deposited together with Ni-P from the solution, and a complex brush plating of Ni-P-Re can be attained. It is discussed the effect of the rare earth Re3+ on the deposition rate, corrosion resistance and bonding strength of the Ni-P composite brush plating. Adding some appropriate Re3+ to the brush plating solution, the amorphous tissue can be obtained under the condition of the low phosphorus brush plating, which make the brush plating layer with high hardness and high abrasive resistance at the same time, binding force and corrosion resistance are improved, and greatly improve the performance of the brush plating.

EFFECT OF TiO2 PARTICLES ON MICRO-HARDNESS, CORROSION, WEAR AND FRICTION OF Ni–P–TiO2 COMPOSITE COATINGS AT DIFFERENT ANNEALING TEMPERATURES

2016 ◽  
Vol 23 (01) ◽  
pp. 1550082 ◽  
Author(s):  
PRASANNA GADHARI ◽  
PRASANTA SAHOO
Keyword(s):  
Wear Resistance ◽  
Corrosion Resistance ◽  
Composite Coatings ◽  
Corrosion Current ◽  
Xrd Analysis ◽  
Charge Transfer Resistance ◽  
Micro Hardness ◽  
Transfer Resistance ◽  
X Ray ◽  
Annealing Temperatures

The present study investigates the effect of titania particles on the micro-hardness, wear resistance, corrosion resistance and friction of electroless Ni–P–TiO2 composite coatings deposited on mild steel substrates at different annealing temperatures. The experimental results confirmed that the amount of TiO2 particles incorporated in the coatings increases with increase in the concentration of particles in the electroless bath. In presence of TiO2 particles, hardness, wear resistance and corrosion resistance of the coating improve significantly. At higher annealing temperature, wear resistance increases due to formation of hard Ni3P phase and incorporation of titania particles in the coated layer. Charge transfer resistance and corrosion current density of the coatings reduce with an increase in TiO2 particles, whereas corrosion potential increases. Microstructure changes and composition of the composite coating due to heat treatment are studied with the help of scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDXA) and X-ray diffraction (XRD) analysis.

Formation and Structural Characterization of Electroless Ni-B-P Ternary Alloy Coatings

2014 ◽  
Vol 592-594 ◽  
pp. 385-390 ◽  
Author(s):  
P.G. Venkatakrishnan ◽  
S.S. Mohamed Nazirudeen ◽  
T.S.N. Sankara Narayanan
Keyword(s):  
Electroless Plating ◽  
Morphological Characteristics ◽  
Reducing Agents ◽  
Sodium Hypophosphite ◽  
Electron Microscopic ◽  
Plating Bath ◽  
Peak Broadening ◽  
Chloride Hexahydrate ◽  
Electroless Ni

The aim of the present investigation is to study the formation of electroless Ni-B-P alloy coatings and structural and morphological characterization of various coatings with different boron and phosphorous content. An alkaline plating bath with nickel chloride hexahydrate as the source of nickel ions and sodium borohydride and sodium hypophosphite as reducing agents were used for the formation of electroless Ni-B-P alloy coatings. The influence of changes in the concentrations of the reducing agents in the electroless plating bath on the chemical composition, structural and morphological characteristics of the coatings were studied. Scanning electron microscopic studies revealed that the surface morphology of Ni-B-P alloy coatings changed from corn cob-like structure to cauliflower-like structure with increasing borohydride concentration in electroless plating bath, whereas increase in hypophosphite concentration favoured sideway growth, thereby decreased the surface roughness of the Ni-B-P alloy coatings. The peak broadening in the X-Ray Diffraction profiles indicates the large reduction in the crystallite size of the electroless Ni-B-P alloy coatings with increasing boron content in the coating (i.e. for higher borohydride concentration in the plating bath).

Fast Electroless Ni-P Coating on AM60 Magnesium Alloy at Low Bath Temperature

2011 ◽  
Vol 418-420 ◽  
pp. 756-759 ◽  
Author(s):  
Guo Bing Mao
Keyword(s):  
Growth Rate ◽  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
Electroless Plating ◽  
Corrosion Test ◽  
Bath Temperature ◽  
Test Results ◽  
Electroless Ni

The Ni-P coatings were deposited on AM60 magnesium alloy by electroless plating process without or with accelerators. Without accelerators, the deposition rate is slow and required high bath temperature to obtain compact coating. There have many defects on the surface of the Ni-P coatings which deposited at high bath temperature. The composite accelerators were introduced into the bath for improving the growth rate and the quality of the Ni-P coating. Uniform, with no pores or cracks, “cauliflower-like” structure and complete Ni-P coatings were deposited only taken 20 min with additives at low bath temperature. The XRD result indicates that the structure of the Ni-P coating is amorphous nickel. The corrosion test results indicated that the corrosion resistance of this coated AM60 magnesium alloys increases distinctly as compared to bare alloys.

Complete Toluene Oxidation over Palladium-Based Monolithic Catalyst Prepared via a New Electroless Plating Method

2011 ◽  
Vol 71-78 ◽  
pp. 2653-2656
Author(s):  
Yong Feng Li ◽  
Yan Ting Huang ◽  
Tan Ting Lin ◽  
Qian Yu ◽  
Lin Yu ◽  
...  
Keyword(s):  
Electroless Plating ◽  
Substrate Surface ◽  
Total Oxidation ◽  
Toluene Oxidation ◽  
X Ray ◽  
Adsorbed Oxygen Species ◽  
Activity Test ◽  
Plating Method ◽  
Good Catalytic Activity ◽  
Electroless Plating Method

The palladium-based catalyst of 0.36wt%Pd/cordierite honeycomb ceramics (CHC) without alumina interlayer film was prepared via a new electroless plating method. The results of activity test for complete toluene oxidation showed that the prepared catalysts had good catalytic activity and temperature resistance. The total oxidation temperature (T99) for toluene was at 230°C for the catalyst calcined at 500°C. The scanning electron microscopy (SEM) results indicated that the particles of palladium phases were small and well dispersed on the CHC substrate surface. And the X-ray photoelectron spectrum (XPS) further revealed that both PdO state and adsorbed oxygen species participated and played a more important role in toluene oxidation reaction.

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