scholarly journals Influence of additives on electrodeposition of bright Zn-Ni alloy on mild steel from acid sulphate bath

2007 ◽  
Vol 30 (5) ◽  
pp. 455-462 ◽  
Author(s):  
S. Shivakumara ◽  
U. Manohar ◽  
Y. Arthoba Naik ◽  
T. V. Venkatesha
Keyword(s):  
Mild Steel ◽  
Acid Sulphate ◽  
Ni Alloy ◽  
Sulphate Bath

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.

scholarly journals Effect of Additives on Electrodeposition of Zinc-Nickel Alloy On Mild Steel

2019 ◽  
Vol 31 (4) ◽  
pp. 891-895
Author(s):  
Dinesh Kumar Chelike ◽  
K. Juliet Gnana Sundari
Keyword(s):  
Corrosion Resistance ◽  
Mild Steel ◽  
Electrochemical Impedance ◽  
Corrosion Behaviour ◽  
Alloy Coating ◽  
Complexing Agent ◽  
Tafel Polarization ◽  
Good Corrosion Resistance ◽  
Ni Alloy ◽  
Strong Candidate

Considering the good corrosion resistance of Zn-Ni alloy, it is selected in the present study to be the protective coating on mild steel and it is considered as a strong candidate for the replacement of environmentally hazardous cadmium. Zn-Ni alloy coating is applied by electrodeposition at optimum temperature, current density and time. The bath solution used is consisting of EDTA as complexing agent. The electrodeposition is also carried out with tartaric acid and benzaldehyde additives to have good corrosion resistance and brightness. The electrodeposits obtained with and without additives are examined for nature and alloy composition. The corrosion behaviour of the electrodeposits is studied by Tafel polarization and electrochemical impedance spectroscopy.

scholarly journals MORPHOLOGY AND PROPERTIES OF ELECTRODEPOSITED ZN-NI ALLOY COATINGS ON MILD STEEL

1970 ◽  
Vol 40 (1) ◽  
pp. 9-14 ◽  
Author(s):  
M J Rahman ◽  
S R Sen ◽  
M Moniruzzaman ◽  
K M Shorowordi
Keyword(s):  
Corrosion Resistance ◽  
Mild Steel ◽  
Current Density ◽  
Perfect Crystal ◽  
Corrosion Property ◽  
Alloy Electrodeposition ◽  
Sulfate Bath ◽  
Ni Alloy ◽  
Electrochemically Deposited ◽  
A Current

Zinc-nickel alloys electrochemically deposited on mild steel under various deposition conditions were investigated. The effect of plating variables (bath composition, pH, current density) on the coating composition, morphology, corrosion property and microhardness were investigated. Modified morphology with perfect crystal growth, uniform arrangement of crystals, refinement in crystal size and hence bright deposit was obtained from sulfate Bath-3 containing 30 g/l H3BO3 at a current density of 75 mA/cm2. Corrosion resistance as well as microhardness of Zn-Ni alloy coatings increased with the increase of %Ni in the deposit for all the sulphate baths studied. Optimum conditions for good deposition are also discussed. Keywords: Zn-Ni alloy, electrodeposition, morphology, corrosion resistance.   doi: 10.3329/jme.v40i1.3468 Journal of Mechanical Engineering, Vol. ME40, No. 1, June 2009 9-14

scholarly journals Multilayered Zn-Ni alloy coatings for better corrosion protection of mild steel

2017 ◽  
Vol 20 (3) ◽  
pp. 1227-1232 ◽  
Author(s):  
Sadananda Rashmi ◽  
Liju Elias ◽  
Ampar Chitharanjan Hegde
Keyword(s):  
Mild Steel ◽  
Corrosion Protection ◽  
Ni Alloy

scholarly journals Electrodeposition of Zn-Co Alloy from an Acid Sulphate Bath Containing Triethanolamine and Thiaminehydrochloride

2021 ◽  
Vol 7 (1) ◽  
pp. 698-701
Author(s):  
V. Narasimhamurthy ◽  
L.H. Shivashankarappa
Keyword(s):  
Metal Ion ◽  
Alloy Composition ◽  
Research Work ◽  
Operating Conditions ◽  
Optimum Operating ◽  
X Ray Diffraction ◽  
Cathodic Current ◽  
X Ray ◽  
Acid Sulphate ◽  
Sulphate Bath

Electrodeposition of Zn-Co alloy from an acid sulphate bath has been carried out in this research work. The effects of metal ion ratio in the bath, pH current density, temperature, stirring, thickness and concentrations of triethanolamine and thiaminehydrochloride on the alloy composition and on cathodic current efficiency have been investigated. The deposition potentials of Zn-Co alloy are less noble of zinc and cobalt. The structure of Zn-Co alloy was investigated by X-ray diffraction indicates zinc structure. The surface morphology of alloy deposits is found to depend on the percentage of cobalt in the alloy. Under the optimum operating conditions, Zn-Co alloy deposition follows anomalous co-deposition.

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

2020 ◽  
Vol 6 (3) ◽  
pp. 689-692
Author(s):  
V. Narasimhamurthy ◽  
L.H. Shivashankarappa
Keyword(s):  
Chemical Properties ◽  
Zinc Content ◽  
Deposition Process ◽  
Cathodic Current ◽  
Plating Bath ◽  
Acid Sulphate ◽  
Alloy Deposit ◽  
Sulphate Bath ◽  
Superior Corrosion Resistance ◽  
Composition Properties

The composition, properties, structure and morphology of electrodeposited Zn-Fe alloy deposits obtained from an acid sulphate bath containing triethanolamine have been investigated. A bath containing less zinc (20%) produced an alloy deposit with higher zinc content (80%), i.e. anomalous co-deposition process. The composition of alloy remained constant with pH of the plating bath and thickness of the alloy deposit. The cathodic current efficiency depends on plating variables. The shift in deposition potentials of Zn-Fe alloy is a chief cause in the co-deposition process to produce alloy of varying composition. Phase structure determination by X-ray diffraction studies showed a wide variety of inter metallic phases. Zn-Fe alloy showed a superior corrosion resistance than zinc coatings. An alloy containing greater than 40% Fe showed a good paintability. Hardness of the alloy deposits increased with increase in iron content in the alloy. Smooth, uniform and fine grained deposits were obtained for the Zn-Fe alloy containing 20% Fe.

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