scholarly journals Characterization and Corrosion Resistance Behavior of Pure Ni Coatings & Ni-V2O5 Nano composite Coatings Developed by DC & PC Methods of Electrodeposition

2021 ◽  
Author(s):  
R Mohanreddy ◽  
B M Praveen ◽  
A Alhadhrami
Keyword(s):  
Corrosion Resistance ◽  
Surface Morphology ◽  
Composite Coatings ◽  
Electrochemical Techniques ◽  
Ac Impedance ◽  
Nanocomposite Coating ◽  
Nanocomposite Coatings ◽  
Spectroscopic Techniques ◽  
Micro Hardness ◽  
Nickel Metal

Abstract Pure nickel (Ni) coating and nickel – vanadium pentoxide (Ni-V2O5) nanocomposite coatings have been developed on mild steel substrates by direct current (DC) & pulse current (PC) methods of electrodeposition using sulfamate electrolyte bath by optimizing all the suitable parameters. The surface morphology and texture characterization of pure Ni coating and Ni-V2O5nanocomposite coatings were analyzed by spectroscopic techniques such as Scanning Electron Microscopy (SEM) equipped with an attachment for Energy Dispersive Spectrometry (EDS) & X-ray Diffraction (XRD) spectroscopy analysis. The SEM study confirmed surface morphology of the pure Ni coating was changed by the incorporation of V2O5 nanoparticles in the nickel metal matrix and chemical composition of all the coatings was determined by EDS. XRD study proved highly corrosion resistant nanocomposites show preferred orientation towards (111) plane. The corrosion rate of all the coatings was investigated in 3.5% corrosive medium using electrochemical techniques such as Tafel extrapolation and AC impedance. The coatings developed by PC show enhanced corrosion resistance behavior compare to coatings developed by DC. The 0.125g/L Ni-V2O5nanocomposite coating obtained by PC show more widened semicircle with high Rp value and has more positive shift with high corrosion resistance during AC impedance and Tafel extrapolation analysis respectively. The coatings developed by PC showed improved micro hardness compare to coatings developed by DC during micro hardness testing of all the coatings.

Corrosion Resistance of Ni-Y2O3 Composite Coating Prepared by Electrodeposition under Ultrasonic Condition

2010 ◽  
Vol 97-101 ◽  
pp. 1235-1238 ◽  
Author(s):  
Yu Jun Xue ◽  
Chen Shen ◽  
Ji Shun Li ◽  
Hang Li ◽  
Dong Hong Si
Keyword(s):  
Aqueous Solution ◽  
Corrosion Resistance ◽  
Electron Microscope ◽  
High Resolution ◽  
Surface Morphology ◽  
Composite Coatings ◽  
Nanocomposite Coating ◽  
Transmission Electron ◽  
Superior Corrosion Resistance ◽  
Electronic Microscope

Ni-Y2O3 nanocomposite coating was electrodeposited from a nickel sulfamate solution containing Y2O3 particles and ultrasonic was applied during the process of the electrodeposition. The surface morphology and microstructure of the composite coatings were analyzed by a scanning electronic microscope (SEM) and a high-resolution transmission electron microscope (HRTEM). The corrosion resistence of the coatings was evaluated in the solution of 10 wt.% HCl aqueous solution. The results indicate that the Ni-Y2O3 nanocomposite coating shows a refined crystal grain and improved corrosion resistance compared with pure Ni coating. The Ni-Y2O3 nanocomposite coating prepared under ultrasonic condition exhibits a superior corrosion resistance due to the formation of denser structure and finer-grain scale.

Corrosion Resistance of Ni-CeO2 Nanocomposite Coating Prepared by Electrodeposition with Rotating Cathode in an Ultrasonic Field

2011 ◽  
Vol 337 ◽  
pp. 54-58 ◽  
Author(s):  
De Ying Zhang ◽  
Yu Jun Xue ◽  
Xian Hui Li ◽  
Ji Shun Li
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Rate ◽  
Surface Morphology ◽  
Ultrasonic Field ◽  
Nanocomposite Coating ◽  
Nanocomposite Coatings ◽  
Ultrasonic Power ◽  
Rotating Speed ◽  
Excellent Corrosion Resistance ◽  
Crystal Grains

Ni-CeO2nanocomposite coatings were prepared by electrodeposition with rotating cathode in an ultrasonic field. The surface morphology of the coatings was examined. Effects of different electrodeposition methods, ultrasonic power and cathode rotating speed on the corrosion rate of Ni-CeO2nanocomposite coatings were analyzed. The results show that the corrosion rate of the coatings decreases considerably with the increasing of ultrasonic power, and suitable cathode rotating speed could decrease the corrosion rate of coatings. During the process of electrodeposition, the CeO2nanoparticles, ultrasonic and rotating cathode influence on the surface morphology of the coatings. The nanocomposite coating obtained by rotating cathode in an ultrasonic field exhibits refined crystal grains and presents an excellent corrosion resistance.

scholarly journals A Study on Ni-Al2O3 Nanocomposite Coating Prepared by Jet Electrodeposition

2010 ◽  
Vol 19 (5) ◽  
pp. 096369351001900 ◽  
Author(s):  
Jinsong Chen ◽  
Yinhui Huang ◽  
Chanzhou Wei ◽  
Bin Qiao ◽  
Jianming Yang ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Composite Coatings ◽  
Nanocomposite Coating ◽  
Nanocomposite Coatings ◽  
Scanning Microscope ◽  
Micro Structure ◽  
Electrodeposition Process ◽  
Jet Electrodeposition ◽  
Average Size ◽  
Electrolyte Jet

Ni-Al2O3 nanocomposite coatings were fabricated by jet electrodeposition process. Effect of concentration of Al2O3 in the electrolyte, current density and electrolyte jet speed on nano-Al2O3 content were analyzed. The composite coatings’ micro structure, energy spectrum was observed under the scanning microscope(SEM). Effect of nano-Al2O3 content on the microhardness and corrosion resistance were evaluated. The results shows that the Ni deposited layers have nanocrystalline micro structure with average size of 50 nm. Al2O3 particles are well dispersed in layer and the particles content is up to 12.2 at %. Microhardness of the coating increase, bond strength and corrosion resistance of the coatings first increase then decrease with increase of Al2O3. content in coatings.

Effect of Pulse Current Electrodeposition on Structural, Mechanical and Corrosion Resistance Properties of Ni- TiO2 Nanocomposite Coatings

2021 ◽  
Vol 406 ◽  
pp. 292-299
Author(s):  
Shahnaz Siad ◽  
Saida Marmi ◽  
Abdelouahad Chala ◽  
Ameur Mekkaoui
Keyword(s):  
Corrosion Resistance ◽  
Current Density ◽  
High Current Density ◽  
Composite Coatings ◽  
Nanocomposite Coating ◽  
Nanocomposite Films ◽  
Nanocomposite Coatings ◽  
Pulsed Current ◽  
Tafel Polarization ◽  
High Microhardness

Ni-TiO2 nanocomposite coatings were fabricated on mild steel surface by pulsed direct current (PC) electrodeposition. This process was carried out in pulsed current at (1, 10, 50) Hz and a duty cycle (25%, 50%, 75%) respectively, at a minimum current density of 0 & high current density of 4 A/dm2. In this work the properties of nanocomposite films were investigated using scanning electron microscopy (SEM), Vickers microhardness measurements and Tafel polarization tests. The composition of the electrodeposits was analyzed by energy dispersive X-ray analysis (EDX). It was found that the coated surface contained at maximum 16.30 % Ti and 35.48 % O. XRD studies revealed [111] preferred orientation. Hardness increased from 560.4 Hv for Ni-TiO2 (F=10 Hz, DC=75 %) nanocomposite coating to 645.7 Hv for Ni-TiO2 (F=10 Hz, DC=25 %) nanocomposite coating. The corrosion resistance of Ni-TiO2 coatings was evaluated by potentiodynamic polarization studies in 3.5 % NaCl solutions. The Pulsed current offer composite coatings with uniform surface, high microhardness and enhanced corrosion resistance significantly for F=10Hz and DC=25 %.

Preparation of Electrodeposited Ni-CNTs Nanocomposite Coatings with Highly Wear and Corrosion Resistance Properties

2012 ◽  
Vol 548 ◽  
pp. 101-104 ◽  
Author(s):  
W. Shao ◽  
D. Nabb ◽  
N. Renevier ◽  
I. Sherrington ◽  
J.K. Luo
Keyword(s):  
Mechanical Property ◽  
Carbon Nanotubes ◽  
Corrosion Resistance ◽  
Surface Morphology ◽  
Corrosion Property ◽  
Nanocomposite Coatings ◽  
Sem Images ◽  
Wear And Corrosion ◽  
Watts Bath ◽  
Wear And Corrosion Resistance

Ni-carbon nanotubes nanocomposite coatings were obtained from a Watts bath containing uniformly dispersed carbon nanotubes (CNTs). The surface morphology was investigated by the SEM images of coatings. The mechanical property and corrosion resistance of the nanocomposite coatings were investigated. This study revealed these CNTs reinforced Ni nanocoatings have improved mechanical and corrosion property.

Preparation and properties of duplex NI-P-TIO2/NI nanocomposite coatings

2019 ◽  
Vol 33 (01n03) ◽  
pp. 1940019 ◽  
Author(s):  
Weihui Zhang ◽  
Di Cao ◽  
Yanxin Qiao ◽  
Yuxin Wang ◽  
Xiang Li ◽  
...  
Keyword(s):  
Mechanical Property ◽  
Wear Resistance ◽  
Corrosion Resistance ◽  
Porous Structure ◽  
Outer Layer ◽  
Nanocomposite Coating ◽  
Nanocomposite Coatings ◽  
Coating Properties ◽  
Duplex Coating ◽  
Plating Solution

Duplex Ni-P-TiO2/Ni coatings were deposited on the brass substrate by using two baths. Ni-P-TiO2 nanocomposite coatings were electroplated as the outer layer on the Ni-plated brass substrate by adding transparent TiO2 sol (0–50 mL/L) into the Ni-P plating solution. The microstructure, mechanical property and corrosion resistance of the duplex Ni-P-TiO2/Ni nanocomposite coatings were systemically investigated. The results show that the interface of duplex coating was uniform and the adhesion between two layers was extremely good. The microhardness of duplex Ni-P-12.5 mL/L TiO2 /Ni coating was [Formula: see text]616 HV[Formula: see text] compared to [Formula: see text]539 HV[Formula: see text] of Ni-P /Ni coating and [Formula: see text]307 HV[Formula: see text] of single Ni coating. Meanwhile, the wear resistance and the corrosion resistance of the duplex nanocomposite coating have also been improved remarkably compared with single Ni coating. However, adding excessive TiO2 sol (more than 12.5 mL/L) caused the agglomeration of TiO2 nanoparticles and led to a porous structure in the outer layer, resulting in the deterioration of coating properties.

Preparation and Property of Electrodeposited Zn-Fe-SiO2 Composite Coating

2008 ◽  
Vol 373-374 ◽  
pp. 212-215 ◽  
Author(s):  
Yun Ying Fan ◽  
Ying Jie Zhang ◽  
Peng Dong
Keyword(s):  
Corrosion Resistance ◽  
Hydrogen Embrittlement ◽  
Surface Morphology ◽  
Composite Coating ◽  
Hydrogen Content ◽  
Particle Concentration ◽  
Composite Coatings ◽  
Particle Content ◽  
Sulfate Bath ◽  
Sio2 Particles

Electrodeposited Zn and Zn-Fe alloy have been applied widely to protect steel from corrosion, but the property of coating still needs to be improved. In this paper, Zn-Fe-SiO2 composite coatings are electrodeposited from Zn-Fe alloy electrolyte containing SiO2 particles. Zinc based coatings with Fe% >1%(mass) are deposited from sulfate bath, and coatings with Fe% <1%(mass) are deposited from chloride bath. Particle content in the composite coating generally increases with particle concentration under an adequate agitation and then tends to saturation. The optimum particle content in the composite coating is 0.5%(mass). Corrosion resistance, porosity, hydrogen embrittlement and surface morphology of Zn-Fe-SiO2 composite coatings have been tested and compared with electrodeposited Zn and Zn-Fe alloy. The data implies that Zn-Fe-SiO2 composite coating has the best corrosion resistance, lowest porosity, lowest hydrogen content and the finest crystal. All the results show that Zn-Fe-SiO2 composite coating is satisfactory to be used as anti-corrosion material for steel and has a great future in application.

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.

Research on the Corrosion Resistance of Ni-ZrO2 Nanocomposite Coatings

2014 ◽  
Vol 633-634 ◽  
pp. 787-790
Author(s):  
Lin Wang ◽  
Jin Lin Lu ◽  
Cheng Wei Li ◽  
Shu Mei Kang
Keyword(s):  
Corrosion Resistance ◽  
Current Density ◽  
Composite Coatings ◽  
Process Condition ◽  
Corrosion Current ◽  
Bath Temperature ◽  
Nanocomposite Coating ◽  
Test Method ◽  
Optimum Process ◽  
Orthogonal Test Method

In order to improve the corrosion resistance of Ni-nanoZrO2 composite coatings. By orthogonal test method,the process for composite electroplating of Ni-ZrO2 was optimized involved current density、bath temperature、the ZrO2 particle concentration. Corrosion resistance and the hardness were tested, microstructure was observed with a scanning electron microscope. The optimized technological conditions are:current density i4A/dm2,bath temperature 45°C, nanoZrO2 addition 7g/L. In this optimum process condition, corrosion current density is 6.186×10-6 A/cm2, corrosion resistance is good, and its hardness is much better than pure nickel plating, also a flat morphology and compact microstructure Ni-ZrO2 nanocomposite coating is get.

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.

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