scholarly journals Electrodeposition of Zn-Ni Alloy from Alkaline Sulphate Bath Triethanolamine and Mercaptopyridine

2020 ◽  
Vol 6 (1) ◽  
pp. 188-191
Author(s):  
V. Narasimhamurthy ◽  
L.H. Shivashankarappa
Keyword(s):  
Nickel Alloy ◽  
Current Density ◽  
Metal Ion ◽  
Nickel Content ◽  
High Hardness ◽  
Good Adhesion ◽  
Regular Type ◽  
Ni Alloy ◽  
Alloy Deposit ◽  
Sulphate Bath

Electrodeposition of Zn-Ni alloy from non-cyanide alkaline sulphate bath containing triethanolamine (TEA) and mercaptopyridine (MPY) under optimized plating conditions such as bath pH, temperature current density and metal ion ratio in the bath produced an alloy deposit with the desired composition of 10-15 %wt. of nickel, alloy of this composition showed good adhesion, high hardness pore free, smooth, uniform and finer grained. Deposition potentials of Zn-Ni alloy lie between the potentials of individual metals. Increase in temperature density decreased the nickel content in the alloy deposit, which with increase in temperature and thickness of the alloy deposit increased nickel content in the alloy deposit. Alloy deposition followed a regular type of co-deposition.

scholarly journals Physico-Chemical Properties of Zn-Ni Alloy Deposits from an Acid Sulphate Bath Containing Ethanolamines

2020 ◽  
Vol 6 (1) ◽  
pp. 184-187
Author(s):  
V. Narasimhamurthy ◽  
L.H. Shivashankarappa
Keyword(s):  
Current Density ◽  
Nickel Content ◽  
Chemical Properties ◽  
Plating Bath ◽  
Acid Sulphate ◽  
Physico Chemical ◽  
Ni Alloy ◽  
Alloy Deposit ◽  
Sulphate Bath ◽  
Composition Properties

The composition, properties, structure and morphology of electrodeposited Zn-Ni alloy deposits obtained from an acid sulphate bath have been investigated. A bath having higher percentage of nickel (50%) produced an alloy deposit with low percentage of nickel (12%), the percentage of nickel in the alloy deposit increases with current density up to 40 A.dm-2, with further increase in current density, the percentage of nickel shows a downward trend, increase in temperature of the plating bath increases the percentage of nickel in the alloy deposit. The hardness of the alloy deposits increases with increase in nickel content in the alloy, the phase structure of alloy deposit shows the presence of α, η, δ and γ phases. The morphology of Zn-Ni alloy deposits shows uniform and finer grained structure.

Electroless Ni-Co-Cu-P Alloy Deposition in Alkaline Hypophosphite Based Bath

2016 ◽  
Vol 694 ◽  
pp. 151-154
Author(s):  
Muhammad Zaimi ◽  
M.N. Azran ◽  
Muhamad Khaizaki Ahmad ◽  
M. Alif ◽  
M.S.A. Aziz ◽  
...  
Keyword(s):  
Nickel Alloy ◽  
Polarization Curve ◽  
Metal Ion ◽  
Copper Ions ◽  
Alloy Coating ◽  
Plating Bath ◽  
Measurement Results ◽  
Alloy Deposit ◽  
Neutral Media ◽  
Alkaline Bath

The use of electroless deposition method to deposit nickel alloy attracts attention due to its uniformity, corrosion resistance in neutral media and low friction. Quaternary nickel alloy deposit can be achieved by adding metal ion additive into the plating bath. Furthermore, the use of alkaline bath can accelerate the deposition rate, and provide sufficient thickness for corrosion protection. In this study, an electroless quaternary nickel alloy is deposited on iron coupons by adding cobalt and copper ions in hypophosphite based Ni-P alkaline bath. The nickel alloy deposit surface morphology is studied using scanning electron microscope (SEM) and x-ray fluorescence (XRF). Corrosion behavior of the nickel alloy is investigated using polarization curve measurement in 3.5wt% NaCl aqueous solution. From the results, the elecroless Ni-Co-Cu-P alloy coating produced at higher plating bah pH is harder than the lower bath pH. Higher Co, Cu and P content in the Ni alloy exhibit broader passive area in the polarization curve measurement results.

KINETICS OF ELECTRODEPOSITION OF ZINC-NICKEL ALLOY FROM SULFATE-GLYCINATE ELECTROLYTE

2019 ◽  
Vol 62 (4) ◽  
pp. 128-134 ◽  
Author(s):  
Elena V. Chentsova ◽  
Svetlana Yu. Pochkina ◽  
Nina D. Solovyova ◽  
Marina I. Lopukhova
Keyword(s):  
Nickel Alloy ◽  
Nickel Content ◽  
Nickel Sulfate ◽  
Cathode Current Density ◽  
Diffusion Control ◽  
Nickel Salt ◽  
Ni Alloy ◽  
Cathode Current ◽  
Kinetics Of ◽  
Zinc Nickel

Kinetics of electrodeposition of a zinc-nickel alloy from the acid sulfate-glycinate electrolyte and the properties of the formed coating have been studied depending on the composition of the electrolyte and the deposition mode. Chronoamperometric studies of the electrodeposition of the zinc-nickel alloy made it possible to establish that at polarization potentials of -1.00 -1.05 V relative to the CSE, processes on the electrode proceed with diffusion control. Changing the potentials to the region of more negative values leads to kinetic difficulties. The formation of the zinc-nickel alloy from the sulphate-glycinate electrolyte is affected by the concentration of the nickel salt. The process polarization, crystallization overvoltage, the amount of nickel in the alloy depends on its content in the solution. The maximum crystallization overvoltage corresponds to the NiSO4 content in the electrolyte in the amount of 0.12-0.14 mol/l. Large partial densities of the electroreduction current of nickel during the formation of the Zn-Ni alloy correspond to the same range of concentrations. It was found that with the content of nickel sulphate more than 0.16 mol / l, the amount of nickel in the precipitate decreases. During electrodeposition of the alloy, the pH of the near-electrode layer increases as a result of hydrogen evolution. It is assumed that with the cathode current density of more than 10 mA/cm2, the formation of the zinc-nickel alloy occurs with the participation of neutral and electronegative complexes. Determination of the protective ability of samples in a 3 % NaCl solution using both chronovoltamperometry and impedance spectroscopy showed that samples with a nickel content of 14.4 % obtained in the solution with a nickel sulfate concentration of 0.12-0.14 mol/l are characterized by maximum corrosion resistance.

scholarly journals New Brightener for Zn-Fe Alloy Plating from Sulphate Bath

2011 ◽  
Vol 2011 ◽  
pp. 1-8 ◽  
Author(s):  
B. M. Praveen ◽  
T. V. Venkatesha
Keyword(s):  
Grain Size ◽  
Metal Ion ◽  
Condensation Product ◽  
Spectroscopic Studies ◽  
Sem Images ◽  
Alloy Electrodeposition ◽  
Fine Grained ◽  
Polarization Studies ◽  
Uv Visible ◽  
Sulphate Bath

Zn-Fe alloy electrodeposition was carried out in the presence of condensation product 2-{[(1E)-(3,4-dimethoxyphenyl)methylidene]amino}-3-hydroxypropanoic acid formed between veratraldehyde and serine in acid sulphate bath. Hull cell was used for optimizing the operating parameters and bath constituents. During deposition, the potential was shifted towards cathodic direction in the presence of addition agents and brightener. The polarization studies show that deposition taking place in basic bath and optimum bath was 1.08 and 1.15 V, respectively. Current efficiency and throwing power were reached around 85% and 26%, respectively. The SEM images of bright deposit indicated its fine-grained nature and appreciable reduction in the grain size. XRD studies have showed that the grain size of the deposit generated from optimum bath was 16 nm. UV-visible spectroscopic studies confirm the formation of complex between metal ion and brightener.

scholarly journals Fabrication of Ni-Mn Microprobe Structure with Low Internal Stress and High Hardness by Employing DC Electrodeposition

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Kuan-Hui Cheng ◽  
Fu-Je Chen ◽  
Chun-Ying Lee ◽  
Chao-Sung Lin ◽  
Jung-Tang Huang ◽  
...  
Keyword(s):  
Internal Stress ◽  
Current Density ◽  
High Hardness ◽  
Power Source ◽  
Manganese Sulphate ◽  
Microelectronic Devices ◽  
Dc Power ◽  
Coating Composition ◽  
Mn Content ◽  
Columnar Grain

Due to its widely tunable mechanical property and incompatibility with most solders, Ni-Mn alloy can become a viable candidate in the fabrication of testing probe for microelectronic devices. In this study, the electrodeposition of Ni-Mn alloy in nickel sulphamate electrolyte with the addition of manganese sulphate was investigated under direct current (DC) power source. The effects of current density and Mn2+concentration in the electrolyte on the coating composition, cathodic efficiency, microstructure and mechanical properties were explored. The results showed that the raise of the Mn2+concentration in the electrolyte alone did not effectively increase the Mn content in the coating but reduce the cathodic efficiency. On the other hand, increasing the current density facilitated the codeposition of the Mn and rendered the crystallite from coarse columnar grain to the refined one. Thus, both hardness and internal stress of the coating increased. The fabrication of testing probes at 1 A/dm2was shown to satisfy the high hardness, low internal stress, reasonable fatigue life, and nonsticking requirements for this microelectronic application.

scholarly journals STUDY ON THE EFFECT OF COMPOSITION AND VARIATION OF Sn/Zn COOLING MEDIA ON NICKEL ALLOY STEEL THROUGH HOT FORGING AND AUSTEMPERING

2021 ◽  
Vol 23 (1) ◽  
pp. 37
Author(s):  
Satrio Herbirowo ◽  
Martin Harimurti ◽  
Septian Adi Chandra ◽  
Dedi Pria Utama ◽  
Faried Miftahur Ridlo ◽  
...  
Keyword(s):  
Nickel Alloy ◽  
Alloy Steel ◽  
Nickel Content ◽  
Hot Forging ◽  
Industrial Applications ◽  
Cooling Medium ◽  
Nickel Chromium ◽  
Cooling Media ◽  
The One ◽  
Bainite Microstructure

STUDY ON THE EFFECT OF COMPOSITION AND VARIATION OF Sn/Zn COOLING MEDIA ON NICKEL ALLOY STEEL THROUGH HOT FORGING AND AUSTEMPERING. Laterite steel with nickel content is expected to be a solution to overcome the lack of domestic steel availability and dependence on imports. This research was conducted to develop Nickel-Chromium-Molybdenum alloy steel used Grinding ball for cement industrial applications. Grinding ball is the one of imported steel products needed to be crushing and size reduction the ores or cement. In addition to import issues, grinding balls have a significant problem: their mechanical properties that do not meet SNI 1049 require the material to have a minimum hardness value of 45 HRC. In this study, the characteristics of Nickel alloy steel were investigated further through heat treatment of forgings heated at the austenitizing temperature of 950 °C and austempering with variations in the cooling medium of Sn/Zn solution. The cooling medium was chosen because it has a melting temperature in the phase diagram area to form the bainite microstructure with complex and challenging characteristics, both of which are required in material for grinding ball applications. In particular, the hardness value that passed the SNI 1069 standard was the use of samples with a Cr-Mo alloy of 1%-wt with a hardness value of 45.92 HRC for Sn Austemper and 48.07 HRC for Zn austemper.

Properties of Ceramic Coatings on the Wall of Coke Oven

2011 ◽  
Vol 189-193 ◽  
pp. 1105-1108
Author(s):  
Shu Xian Liu ◽  
Li Li Shen ◽  
Qian Ping Wang
Keyword(s):  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
High Hardness ◽  
Coke Oven ◽  
Ceramic Coatings ◽  
Good Adhesion ◽  
Before And After ◽  
Shock Resistance ◽  
Uncoated Specimen ◽  
Better Than

Flame sprayed ceramic coatings on the wall of coke oven are characterized before and after melting. The attempt has been made to investigate thermal shock resistant, carbon deposit resistant, wear resistant of the coated and melted samples. The techniques used are SEM and XRD. The results show that: 1) Presence of quartz, corundum and mullite are identified in the surface of the coated specimen. Good adhesion between the coating and the substrate is caused by presence of quartz which is the same content as the substrate.2) The thermal shock resistance cycles of the coating samples are 15 ~ 30 times, but uncoated samples are only 1~2 times. The main reason is that he coating–substrate interface shows no gaps or cracks, and it has a characteristic feature of good adhesion between the coating and the substrate. 3) The wear resistance of the coated samples are better than that of the uncoated samples because glass-coating is more smooth than the uncoated specimen and the mullite and corundum in the coating have the high hardness value that makes the hardness of the coating increased.

Preparation of Pulse Electrodeposited Mo-Ni Coating

2014 ◽  
Vol 971-973 ◽  
pp. 161-164
Author(s):  
Xiao Zhen Liu ◽  
Le Tian Xia ◽  
Jian Qiang Gen ◽  
Xiao Zhou Liu ◽  
Jie Chen ◽  
...  
Keyword(s):  
Current Density ◽  
Duty Cycle ◽  
Deposition Temperature ◽  
Deposition Time ◽  
Pulse Electrodeposition ◽  
Electro Deposition ◽  
Electrodeposition Method ◽  
Electrodeposition Time ◽  
Ni Alloy

Mo-Ni coatings were prepared on Ni alloy by pulse electrodeposition method. The effects of current density, electrodeposition temperature, frequency, duty cycle and electrodeposition time on microhardness of Mo-Ni coating were researched, respectively. Microhardness of Mo-Ni coating increases with the increase of current density, electrodeposition temperature, frequency and electro-deposition time in 17.75 A/dm2 ~ 19.25 A/dm2. 21 °C~ 25 °C, 1000 Hz ~ 5000 Hz and 10 min ~ 20 min, respectively. Microhardness of Mo-Ni coating decreases with the increase of electrodeposition temperature, electrodeposition time and duty cycle in 25 °C ~ 37 °C, 20 min ~ 30 min and 0.5 ~ 0.9, respectively. In the range of current density from 19.25A/dm2 to 20.75 A/dm2, microhardness of Mo-Ni coating is neariy constant with the increase of current density. When electrodeposition parameters: current density 19.25 A/dm2, electro-deposition temperature 25 °C, frequency 5000 Hz, duty cycle 0.5 and electrodeposition time 20 min, microhardness of Mo-Ni coatin is as high as 707.9 HV.

Determination of Tin and Nickel Content in Pyrophosphate Tin-Nickel Alloy Plating Bath

2011 ◽  
Vol 233-235 ◽  
pp. 214-218
Author(s):  
Qiu Ju Geng ◽  
Xue Wei
Keyword(s):  
Standard Deviation ◽  
Nickel Alloy ◽  
Nickel Content ◽  
Plating Bath ◽  
Nickel Ion ◽  
Nickel Ions ◽  
Alloy Plating ◽  
Total Measurement Error ◽  
Analytical Requirements

Tin and nickel ions are in stable complexing form in Pyrophosphate tin-nickel alloy plating bath, this paper uses back-titration of Zn2+ standard solution to determine total amount of tin and nickel ions, and spectrophotometry to determine content of nickel ions in the bath to study interference and elimination methods of co-existing components. The results show that: eliminate the interference of pyrophosphate by heating the solution to hydrolyse and mask Sn4+ and Fe3+ effectively with triethanolamine, the total measurement error is about 0.91%, standard deviation is 0.0141; The recovery of determination for nickel ion content is 99.13%, and standard deviation is 0.0180; The method i-s simple, fast and is able to meet the analytical requirements for controlling the plating quality.

Effect of pH on Composition, Structure and Magnetic Properties of Electrodeposited Co-Ni Alloys

2009 ◽  
Vol 68 ◽  
pp. 52-59 ◽  
Author(s):  
T. Mahalingam ◽  
K. Sundaram ◽  
Subramaniam Velumani ◽  
M. Raja ◽  
S. Thanikaikarasan ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Nickel Content ◽  
Cobalt Content ◽  
Soft Magnetic ◽  
Solution Ph ◽  
Ni Alloys ◽  
Ni Alloy ◽  
Sulfate Baths ◽  
Composition Structure ◽  
Kinetics Of

Co-Ni alloy thin films were electrodeposited from sulfate baths at various solution pH values (1.5-5.5) ±0.1. The deposition kinetics of the films was studied using linear sweep voltametry (LSV). XRD studies exhibited fcc and hcp phases for Co-Ni alloys deposited at low and high pH ranges, respectively. EDAX studies showed that the cobalt content increased and nickel content decreased with increase in solution pH. The surface morphology of Co-Ni films were analyzed by scanning electron microscopy. It is found that the Co-Ni alloys synthesized at low pH exhibited soft magnetic properties and the films deposited at higher values revealed hard magnetic properties and the results are discussed.

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