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 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.

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.

The influence of anthropogenically increased pH on the content and the mobility of nickel in arable soils in the surroundings of “Małogoszcz” cement plant

2013 ◽  
Vol 64 (1) ◽  
pp. 14-18 ◽  
Author(s):  
Hanna Jaworska ◽  
Agata Bartkowiak ◽  
Szymon Różański
Keyword(s):  
Calcium Carbonate ◽  
Sequential Analysis ◽  
Nickel Content ◽  
Chemical Properties ◽  
Total Content ◽  
Cement Plant ◽  
Arable Soils ◽  
Positive Correlation ◽  
Ph Values ◽  
Physico Chemical

Abstract The aim of the conducted research was the evaluation of the influence of increased pH on the content and mobility of nickel in arable soils in the surroundings of Małogoszcz Cement Plant. The physico-chemical properties of the investigated soils were determined by the methods commonly used in soil laboratories. The total content of Ni was determined after mineralization in the mixture of HF and HClO4 acids, and the content of forms available for plants, after the extraction with DTPA solution, using ASA method. The investigated soils are characterized as loamy sands or sands (PTG 2008). These soils have the content of C-organic in the range of 10.3.24.2 g·kg-1 in the surface horizons and 8.3.20.3 g·kg-1 in the subsurface horizons. The pH values allow to classify these soils as alkaline. In all of the investigated soils calcium carbonate occurs. The values of total content of nickel were in the range of 1.47.2.82 mg·kg-1 in surface horizons and 1.80.2.45 mg·kg-1 in subsurface horizons, which allows to classify these soils as soil with natural nickel content. The content of Ni-DTPA were in the range of 0.06.0.26 mg·kg.1. The sequential analysis of the obtained results indicates on significant statistically positive correlation between the total content of Ni and C-organic, which has the value of 0.648143 and between the content of Ni-DTPA and the content of fraction with Ø<0.002 mm, with the value of 0.581113 on p=0.05.

Effect of Triethanolamine Addition in Alkaline Bath on the Electroplating Behavior, Composition and Corrosion Resistance of Zn-Ni Alloy Coatings

2013 ◽  
Vol 738 ◽  
pp. 87-91 ◽  
Author(s):  
Jin Ming Long ◽  
Xiu Zhang ◽  
He Zhong Pei
Keyword(s):  
Corrosion Resistance ◽  
Electrochemical Impedance ◽  
Steel Substrate ◽  
Nickel Content ◽  
Deposition Potential ◽  
Molar Ratio ◽  
Complexing Agents ◽  
Plating Bath ◽  
Ni Alloy ◽  
Alkaline Bath

Zn-Ni alloy coatings were electrodeposited on low carbon steel substrate using a cyanide-free alkaline bath containing tetraethylenepentamine (TEPA) and triethanolamine (TEA) as complexing agents for Ni2+cations. Effect of TEA/Ni2+molar ratio on electrodeposition behavior, micromophology, Ni content and corrosion resistance of coatings were studied by means of SEM/EDS, polarization curve and electrochemical impedance spectroscopy (EIS), respectively. It was found that the deposition potential and elecctrochemical impedance of the cathode sample during the electrodeposition was influenced by the TEA/Ni2+molar ratio (TNmr) in the bath. The deposition potential shifts negatively and the impedance rises with increasing TNmrup to 2. The nickel content in Zn-Ni deposit was varied in a range from 16.81 to 19.04 wt.%. The dependence of cathodic current efficiency and depositing velocity of the coating on TNmrof plating bath were also determined. A fine-grained and smooth-faced coating was obtained at TNmr=2, which exhibited the highest corrosion resistance in 3.5% NaCl environment.

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 A Comparative Study of the Electro-Assisted Grafting of Mono- and Bi-Phosphonic Acids on Nitinol

Surfaces ◽  
2019 ◽  
Vol 2 (4) ◽  
pp. 520-530
Author(s):  
Bastien Arrotin ◽  
Corentin Libioulle ◽  
Tatiana Issakova ◽  
Laetitia Mespouille ◽  
Philippe Dubois ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Nickel Content ◽  
Chemical Properties ◽  
Surface Modifications ◽  
Industrial Applications ◽  
Organic Coatings ◽  
Methylphosphonic Acid ◽  
Phosphonic Acids ◽  
Physico Chemical ◽  
Molecular Layers

Over the last few years, Nitinol (NiTi) has become one of the most attractive alloy materials for industrial applications. However, its implementation is still problematic due to its surface nickel content, making it sensitive to pitting corrosion. In applications, it is often necessary to modify NiTi surfaces by using organic coatings, which provides new physico-chemical properties as well as functionalities and often contributes to a reinforcement of the alloy corrosion resistance. In this work, we assess the differences between the molecular layers made out of methylphosphonic acid (C1P) and the bi-phosphonic acid derivatives: (methylimino)dimethylene-bisphophonic acid (MIP2) and 1-hydroxyethylidene-1,1-diphosphonic acid (HEP2) using conventional (CG) and electro-assisted (EG) graftings. The surface modifications with the bi-phosphonic derivatives (MIP2) and (HEP2) carried out with the EG process lead to denser layers and a reinforced NiTi corrosion resistance.

Influence of SiO2 Nanoparticle Codeposition on Homogeneity of Zinc-Nickel Alloy Plating from an Acid Sulphate Bath

2014 ◽  
Vol 783-786 ◽  
pp. 1420-1425 ◽  
Author(s):  
Makoto Hino ◽  
Koji Murakami ◽  
Ken Muraoka ◽  
Norihito Nagata ◽  
Teruto Kanadani
Keyword(s):  
Film Thickness ◽  
Early Stage ◽  
Sio2 Nanoparticles ◽  
Plating Bath ◽  
Deposition Behavior ◽  
Acid Sulphate ◽  
Sio2 Nanoparticle ◽  
Sulphate Bath ◽  
Alloy Plating ◽  
Zinc Nickel

Zinc-nickel-SiO2 electrodeposits have been produced from an acid sulphate bath. Thecodeposition behavior of SiO2 and the homogeneity of platings were examined. The presence ofSiO2 nanoparticles in the plating bath appears to change the alloy deposition behavior. Rate ofnickel deposition was considerably decreased with SiO2 nanoparticles in the bath. The homogeneityof platings between zinc and nickel were improved by adding the SiO2 nanoparticles in the bath. Atan early stage of electrodeposition, it seems that the SiO2 nanoparticle acts as a nucleus of theprecipitation. The SiO2 nanoparticle has not uniformly dispersed in a plating film, but distributedonly in the SiO2 rich layer with about 50 nm in thickness formed beneath the surface. In addition,this SiO2 rich layer can improve the anticorrosive performance. Therefore, the zincic use can besuppressed, because film thickness can be more thinned, compared with zinc and zinc-nickel alloyelectroplating.

Sign in / Sign up

Export Citation Format

Share Document