scholarly journals TRIBOLOGICAL PROPERTIES AND MICROSTRUCTURE OF ELECTROLESS NICKEL COATINGS REINFORCED WITH NANOPARTICLES

2019 ◽  
Vol 3 ◽  
pp. 88
Author(s):  
Julieta Kaleicheva ◽  
Zdravka Karaguiozova ◽  
Valentin Mishev
Keyword(s):  
Wear Resistance ◽  
Classical Method ◽  
Experimental Testing ◽  
Electroless Nickel ◽  
Lower Bainite ◽  
Optical Microscope ◽  
Test Machine ◽  
Nickel Deposition ◽  
Nickel Coatings ◽  
Strengthening Particles

Composite nickel coatings composed of Ni; Ni + TiN are studied. The method for elecrtroless nickel deposition EFFTOM-NICKEL with TiN nanosized strengthening particles (50nm) is applied. The coatings are deposited on austempered ductile iron (ADI) samples. The composition of cast iron samples is: Fe-3,63C-2,59Si-0,30Mn-0,010S-0,034P-0,53Cu wt. %. The samples are put under isothermal hardening at 900oС for an hour and isothermal retention at 290 oС for 2 hours with the aim to receive a lower bainite structure. The wear resistance experimental testing is carried out using Taber-Abraser test machine by disk to disk classical method. The microstructure observations of the coatings and padding are performed using an optical microscope GX41 OLIMPUS also the coatings’ microhardness by Knoop Method is examined. The wear resistance, microstructure, thickness and microhardness of the as plated and thermally processed at 290oС for 6 hours coatings are defined.

Optimization Studies on Electroless Nickel Coatings

2014 ◽  
Vol 4 (4) ◽  
pp. 1-25 ◽  
Author(s):  
Sanjib Kundu ◽  
Prasanta Sahoo ◽  
Suman Kalyan Das
Keyword(s):  
Wear Resistance ◽  
Corrosion Resistance ◽  
Nickel Coating ◽  
Electroless Nickel ◽  
Bath Temperature ◽  
Solution Concentration ◽  
Electrical And Magnetic Properties ◽  
Nickel Coatings ◽  
Deposition Parameters ◽  
Wear And Corrosion

Electroless nickel coating is a novel method of coating which can be developed in various combinations of alloys and composites each having its unique set of characteristics. Electroless nickel coatings are mainly used for wear and corrosion resistant properties. However, additional characteristics like smoothness of deposit, low friction, descent plating rate, electrical and magnetic properties also make them suitable for a host of applications. The properties of electroless nickel coatings depend mainly on the electroless solution ingredients as well as deposition conditions. Important deposition parameters include bath temperature, concentration of nickel source, concentration of reducing agent, pH of the solution, concentration of surfactants, and so on. Moreover, heat treatment is found to modify the microstructure of the coating and influence certain properties viz. hardness, wear resistance, corrosion resistance, etc. A large number of works have been published by the researchers on the evaluation of electroless nickel coating performance on the basis of hardness, roughness, corrosion resistance, friction and wear resistance for various types of coatings and substrates. Several approaches are proposed in the literatures to solve the problems related with optimization of these parameters. It is felt that a review of the various approaches developed would help to compare their main features and their relative advantages or limitations which will enable to choose the most suitable approach for a particular application and also throw light on aspects that needs further attention. In this regard, the present paper presents a review on the developments done on the optimization of electroless nickel coatings to increase its efficiency.

Hard Chrome Replacement with Cirrus Doped Electroless Nickel Coatings

2021 ◽  
Vol 893 ◽  
pp. 105-110
Author(s):  
See Leng Tay ◽  
Pratik Jadhav ◽  
Chris Goode
Keyword(s):  
Wear Resistance ◽  
Abrasive Wear ◽  
Electroless Nickel ◽  
Nanocomposite Coating ◽  
Abrasive Wear Resistance ◽  
Corrosion Properties ◽  
Nickel Coatings ◽  
Low Phosphorus ◽  
Comprehensive Comparison ◽  
Hard Chrome

The intrinsic hardness, high abrasive wear resistance, and corrosion properties of hard chrome coatings have resulted in their wide industrial application. However, chrome plating involves hazards associated with chrome 6+ which affect human health and drive the need to identify viable alternatives. This study investigated the addition of Cirrus alumina Dopant™ to a low phosphorus electroless nickel bath to evaluate the performance of the resulting nanocomposite coating as a potential replacement for hard chrome. A comprehensive comparison for the performance of coatings for alumina doped electroless nickel and a pure low electroless nickel coating were investigated. Results showed that Cirrus doped electroless nickel possessed a minimum hardness of 850HV0.1, high corrosion resistance, excellent abrasive wear resistance, and a Taber Wear Index of 2.25mg/1000 cycles. These attributes suggest Cirrus Dopant™ for electroless nickel may offer an outstanding candidate to replace hard chrome coatings in many applications.

Comparison of Various Electroless Nickel Coatings on Steel: Structure, Hardness and Abrasion Resistance

2014 ◽  
Vol 783-786 ◽  
pp. 1405-1413 ◽  
Author(s):  
Véronique Vitry ◽  
Adeline Sens ◽  
Fabienne Delaunois
Keyword(s):  
Heat Treatment ◽  
Wear Resistance ◽  
Steel Substrate ◽  
Steel Structure ◽  
Electroless Nickel ◽  
Scratch Testing ◽  
Nickel Coatings ◽  
Heat Treated ◽  
Nickel Deposits ◽  
Heat Treated Condition

Several electroless nickel deposits, on steel substrate, of varying chemistry were investigated in the as-plated and heat-treated condition: 3 nickel-phosphorous (low, mid and high P) and 2 nickel-boron (nickel-boron (lead) and nickel-boron (thallium)). Samples were characterized by SEM and X-ray diffraction. They were then submitted to Knoops microhardness testing and Taber abrasion tests, with abrasive CS-10 wheels, as well as scratch testing to investigate their mechanical properties and wear resistance. Hardness and wear resistance of all deposits were improved by heat treatment, but the best candidate was the Nickel-boron (lead), with a hardness over 1100 hk50 after heat treatment and a Taber Wear Index of 6. Scratch testing allowed identifying the damage mechanisms of the coated systems.

Microstructure and wear property of Fe–Cr13–C hardfacing alloy reinforced by WC particles

2017 ◽  
Vol 31 (16-19) ◽  
pp. 1744030
Author(s):  
Ke Yang ◽  
Jiaqi Li ◽  
Yefeng Bao ◽  
Yongfeng Jiang
Keyword(s):  
Wear Resistance ◽  
Wear Behavior ◽  
Energy Dispersive Spectrometer ◽  
Lath Martensite ◽  
Residual Austenite ◽  
Optical Microscope ◽  
Test Machine ◽  
Wear Property ◽  
Abrasion Test ◽  
Hardfacing Alloy

Tungsten as the most effective carbide-forming element was added in the Fe–Cr13–C hardfacing alloy to precipitate WC particles. Optical microscope (OM), scanning electron microscope (SEM) and energy-dispersive spectrometer (EDS) were used to investigate the microstructures of the hardfacing alloy. The wear resistance was tested through a slurry rubber wheel abrasion test machine, and the wear behavior was also studied. The results indicate that the microstructures of the hardfacing alloy consist of lath martensite, residual austenite and WC particles. The wear resistance can be significantly improved through the addition of tungsten element being provided by the precipitation of WC particles. And the predominant wear mechanism was microcutting with shallow grooves and spalling.

ENPLATE NI-423

Alloy Digest ◽  
1986 ◽  
Vol 35 (11) ◽  
Keyword(s):  
Wear Resistance ◽  
Physical Properties ◽  
Surface Treatment ◽  
High Speed ◽  
Chemical Reduction ◽  
Electronic Devices ◽  
Electroless Nickel ◽  
Heat Treating ◽  
Corrosion And Wear ◽  
Phosphorus Alloy

Abstract ENPLATE NI-423 is a nickel-phosphorus alloy deposited by chemical reduction without electric current. It is deposited by a stable, relatively high-speed functional electroless nickel process that produces a low-stress coating with good ductility and excellent resistance to corrosion. Its many uses include equipment for chemicals and food, aerospace components, molds and electronic devices. This datasheet provides information on composition, physical properties, and hardness. It also includes information on corrosion and wear resistance as well as heat treating, machining, joining, and surface treatment. Filing Code: Ni-343. Producer or source: Enthone Inc..

EVALUATION OF TRIBOTECHNICAL PROPERTIES OF THE COATING OBTAINED BY ELECTRIC SPARK HARDENING

2020 ◽  
Vol 4 (141) ◽  
pp. 157-163
Author(s):  
IL’YA ROMANOV ◽  
◽  
ROMAN ZADOROZHNIY
Keyword(s):  
Wear Resistance ◽  
Reference Sample ◽  
Optical Microscope ◽  
Research Purpose ◽  
Tribotechnical Properties ◽  
Uncoated Surface ◽  
Before And After ◽  
Materials Used ◽  
Friction Track

When applying coatings using various methods on the surfaces of moving parts that work in joints, it is important to make sure that the coatings are strong and wear-resistant in order to return them to their original resource. All existing hardening technologies and materials used to perform coatings have their own characteristics, therefore, the quality of the resulting coatings can be judged only after specific tests. (Research purpose) The research purpose is in evaluating the properties of the coating obtained by the method of electric spark hardening, and its ability to resist friction and mechanical wear. (Materials and methods) Authors conducted tests on the basis of the "Nano-Center" center for collective use. A coating was applied on the BIG-4M unit with a VK-8 hard alloy electrode, tribological properties were evaluated on a CSM Instruments TRB-S-DE-0000 tribometer, the width of the friction track was measured after the test using an inverted OLYMPUS gx51 optical microscope, and samples were weighed before and after the test on a VLR-200 analytical balance. Conducted research in accordance with GOST 23.224-86 and RD 50-662-88 guidelines. (Results and discussion) The article presents performed tests on the run-in and wear resistance of the coating. The samples were worked on with a step-by-step increase in the load. During the tests, the friction force was drawed on the diagram. Authors compared the results with the reference sample, an uncoated surface. (Conclusions) The resulting coating has better run-in and wear resistance compared to the standard, and the increase in wear resistance in dry friction conditions is very significant.

Fabrication and Research of Electroless Nickel Plating on Carbon Fiber with Palladium-Free Activation

2010 ◽  
Vol 148-149 ◽  
pp. 410-415
Author(s):  
Xiao Ping Luo ◽  
Ming Gang Zhang ◽  
Chun Xiang Lv
Keyword(s):  
Tensile Strength ◽  
Carbon Fiber ◽  
Fiber Surface ◽  
Electroless Nickel ◽  
Electroless Nickel Plating ◽  
Nickel Plating ◽  
Adhesive Properties ◽  
Nickel Deposition ◽  
X Ray ◽  
Electroless Ni

A new procedure of surface activation without using palladium salt is proposed for electroless nickel plating (Ni-P) on carbon fiber. The optimal formula and technical conditions for palladium-free activated electroless Ni-P were obtained by orthogonal experiments. The effects of nitric acid processing time on the quality of nickel coating was investigated .The effects of varying concentrations of Ni2 + on the rate of weight gain during the Ni2 + complex adsorption process were also analyzed and the kinetic equation of the process was established. The theoretical values calculated by the equation were proven to be consistent with the experimental verification. The material characteristics of the deposited layers were analyzed by scanning electron microscopy (SEM), energy-dispersive x-ray spectroscopy (EDX) and X-ray diffraction (XRD). The tensile strength of the carbon fibers was analyzed by the Weibull method, and this showed that when the thickness of the Ni-P coating reached 0.150μm, the tensile strength reached a maximum value. The experimental results showed that the nickel deposition on the carbon fiber surface obtained by this method, had the same uniformity, compactness and adhesive properties as the one by conventional electroless Ni-P.

The preparation of thermo-responsive palladium catalyst with high activity for electroless nickel deposition

2010 ◽  
Vol 204 (14) ◽  
pp. 2130-2135 ◽  
Author(s):  
Wen-Ding Chen ◽  
Yuh Sung ◽  
Chang-Pin Chang ◽  
Yann-Cheng Chen ◽  
Ming-Der Ger
Keyword(s):  
High Activity ◽  
Palladium Catalyst ◽  
Electroless Nickel ◽  
Nickel Deposition ◽  
Electroless Nickel Deposition

Effects of the Rolling Directions on Wear of the Aluminum Alloys

2021 ◽  
Vol 901 ◽  
pp. 193-198
Author(s):  
Yuh Ping Chang ◽  
Li Ming Chu ◽  
Chien Te Liu ◽  
Jin Chi Wang ◽  
Gao Wei Chen
Keyword(s):  
Wear Resistance ◽  
Aluminum Alloys ◽  
Rolling Direction ◽  
Optical Microscope ◽  
Operating Conditions ◽  
Crystal Phase ◽  
Transportation Industry ◽  
Key Technology ◽  
Crystal Grains

Due to the booming development of the automation industry and the transportation industry, the mechanical components are prone to wear under long-term operating conditions. To improve the wear resistance, effects of the rolling directions on wear of the aluminum alloys are studied. An optical microscope is used to analyze the crystal phase, and the correlation between the crystal grains and the rolling direction is studied. This study can therefore establish a key technology for improving the wear resistance of aluminum alloys.

Sign in / Sign up

Export Citation Format

Share Document