Effect of Coating Bath Parameters on Properties of Electroless Nickel-Boron Alloy Coatings

2022 ◽  
Vol 10 (1) ◽  
pp. 0-0
Keyword(s):  
Surface Roughness ◽  
Surface Hardness ◽  
Chloride Concentration ◽  
Electroless Nickel ◽  
Nickel Chloride ◽  
Scratch Test ◽  
X Ray Diffraction ◽  
Tribological Behaviour ◽  
Pin On Disc ◽  
Mechanical Behaviours

Electroless nickel-boron binary coatings were obtained with various bath compositions to investigate the effect of bath parameters on tribological and mechanical behaviours of the coating. Characterisation of the coating for surface morphology and phase structure is done using Scanning Electron Microscopy (SEM) and X-ray Diffraction (XRD), respectively, whereas tribological behaviour of coatings is evaluated on a pin-on-disc tribo-tester. Elastic modulus and surface hardness of coatings have been obtained using nano-indentation technique, while the scratch behaviour of the coatings has been determined using micro-scratch test. Corrosion resistance of coatings is also determined. It is observed that surface roughness of the coatings increased with increase in sodium borohydride concentration but decreased slightly with increase in nickel chloride concentration. Friction and wear characteristics are found to increase with surface roughness which occurs due to increased boron content. Surface hardness and scratch hardness are also seen to vary with coating bath parameters.

Study on Influence of Zwitterionic Surfactant on the Surface Finish and Surface Morphology of Electroless Ni-B Coatings on Al 7075-T6 Alloy

2014 ◽  
Vol 984-985 ◽  
pp. 476-481
Author(s):  
M. Vijayanand ◽  
R. Elansezhian
Keyword(s):  
Surface Roughness ◽  
Surface Morphology ◽  
Electroless Nickel ◽  
Nickel Chloride ◽  
Zwitterionic Surfactant ◽  
X Ray Diffraction ◽  
Average Roughness ◽  
Al 7075 ◽  
Electroless Ni ◽  
Nodular Appearance

The influence of Zwitterionic - propanesulfonate surfactant on the surface properties such as surface roughness, surface morphology and microhardness of Ni-B coatings using electroless alkaline bath was reported in this paper. Ni-B deposits obtained from nickel chloride as the source of nickel and borohydride as the reducing agent at a pH of 11 and 12 and temperature 85 ± 2 OC. This study reveals that the Ni – B coatings were clearly influenced by the addition of surfactant propanesulfonate on surface roughness and surface morphology. Electroless nickel (EN) - B coatings with addition of surfactant has changed the surface morphology from non-smooth nodular appearance to a smooth surface with average roughness value 1.4μm, which is less than the Ra value of without surfactant 1.98μm. The hardness of the deposit increased with lesser concentration of the surfactant when compared to without surfactant addition. Surface morphology and composition of the Ni–B coatings was analyzed by scanning electron microscope (SEM) and X-ray diffraction (XRD).

Effect of Reinforcement and Tribological Behaviour of AA 7068 Hybrid Composites Manufactured through Powder Metallurgy Techniques

2017 ◽  
Vol 867 ◽  
pp. 19-28 ◽  
Author(s):  
J. Lakshmipathy ◽  
Subburaj Rajesh Kannan ◽  
K. Manisekar ◽  
S. Vinoth Kumar
Keyword(s):  
Sintering Temperature ◽  
Hybrid Composites ◽  
High Strength ◽  
Phase Changes ◽  
Wear Loss ◽  
X Ray Diffraction ◽  
Tribological Behaviour ◽  
Different Temperatures ◽  
Pin On Disc ◽  
Sliding Distance

In this article, an attempt was made to study the mechanical behaviour of AA7068 - 6 vol. % of MoS2 - X vol. % of WC (X = 0, 5, 10 and 15) hybrid aluminium composites produced by blend–press–sinter methodology. Compacted Powders (700MPa) were sintered at different temperatures (450 0c, 500 0c and 550 0c ) in order to find the influence of sintering temperature on mechanical properties and tribological behavior of AA7068 hybrid composites.The sintered samples have been characterized by x-ray diffraction (XRD) method for identification of phases and also to investigate the phase changes. The change in density, hardness and porosity values of composites were reported. The composite with 15 vol. % of tungsten carbide and 6 vol. % of MoS2 showed the highest hardness and density at the sintering temperature range of 550 0c. Pin-on-disc type apparatus was used for determining the wear loss occurring at different conditions. The hybridization of the two reinforcements enhanced the wear resistance of the composites, especially under high applied load, sliding distance and sliding speeds. Due to this, the hybrid aluminium composites can be considered as an outstanding material where high strength and wear-resistant components are of major importance, predominantly in the aerospace and automotive engineering sectors. The morphology of the wear debris and the worn out surfaces were analyzed to understand the wear mechanisms.

scholarly journals Synthesis of nanostructured (Ti-Zr-Si)N coatings deposited on Ti6Al4V alloy

2021 ◽  
Author(s):  
Leydi Julieta Cardenas-Flechas ◽  
Claudia Patricia Mejía-Villagran ◽  
Miryam Rincon-Joya ◽  
Jhon Jairo Olaya-Florez
Keyword(s):  
Electron Microscopy ◽  
Room Temperature ◽  
Scratch Test ◽  
Adhesive Failure ◽  
Cohesive Failure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Vis Spectroscopy ◽  
Pin On Disc ◽  
Scanning Electron

d Zr targets. The synthesis of the coatings was carried out by varying the discharge power in the Ti5 well as a variation in the deposit temperature at room temperature 130° and 260°C. The coatings were characterized by means of X-ray diffraction (XRD), evidencing the formation of the phase that belongs to the solid solution (Zr, Ti)N, scanning electron microscopy (SEM), UV-Vis spectroscopy and hardness and pin-on-disc tests. The thickness was measured through interferometry with values between 662 and 481nm for the deposited coatings. According to the failure mechanism in the scratch test, the best results were obtained with a power of 170W and 260°C with a cohesive failure Lc1 = 2.1N and an adhesive failure Lc2 = 4.7N. 

Improvement in Microscratch Resistance of Graphite by Surface Modification for Molding Applications

2017 ◽  
Vol 140 (1) ◽  
Author(s):  
Auezhan Amanov ◽  
Bakhtiyor Urmanov ◽  
Ki-Chol Kim ◽  
Young-Sik Pyun
Keyword(s):  
Surface Roughness ◽  
Surface Modification ◽  
Three Dimensional ◽  
Surface Hardness ◽  
Scratch Test ◽  
Scratch Resistance ◽  
Molding Process ◽  
Cover Glass ◽  
Force Microscopy ◽  
Before And After

This paper deals with the improvement in surface properties and microscratch resistance of graphites by means of an ultrasonic nanocrystalline surface modification (UNSM) technique. The surface roughness and surface hardness of the untreated and UNSM-treated graphites were investigated using an atomic force microscopy (AFM) and a microhardness tester, respectively. The scratch resistance was assessed using a microscratch tester at a progressive load. Moreover, a Raman spectroscopy was employed to characterize the microstructure of graphites before and after UNSM treatment. The scratch test results revealed that the resistance to scratch of both UNSM-treated graphites was found to be better in comparison with the untreated graphites. The increase in scratch resistance of both UNSM-treated graphites may be mainly attributed to the reduced surface roughness and increased surface hardness by UNSM treatment. The graphite produced by Poco exhibited a higher resistance to scratch compared to that of the graphite produced by Mersen. The objective of this study is to extend the service life of three-dimensional (3D) cover glass moldings made of graphite by the application of UNSM treatment through the understanding the effects of surface roughness and surface hardness on the scratch defect generation behavior during glass molding process.

Tribological behaviour and surface quality of polymeric industrial sealing materials

2010 ◽  
Vol 1 (1) ◽  
pp. 212-218
Author(s):  
Laszlo Zsidai ◽  
Robert Keresztes
Keyword(s):  
Surface Roughness ◽  
Research Work ◽  
Test Results ◽  
Tribological Behaviour ◽  
Polymer Tribology ◽  
Wear And Friction ◽  
Pin On Disc ◽  
Sealing Materials ◽  
Effect Of Surface

Tests presented in our research work as an example give look into the wear and frictionbehaviour of some typical polymer sealing compound (POM, PEEK, PA). The measurementsexamine above all the effect of surface roughness onto the wear and friction behaviour wear incase of optimal loading relations. We have carried out the test in pin-on –disc system. Based onthe test results we have classified the polymers on the basis of wear and friction factors.Keywords polymer tribology, sliding seals, surface roughnes, pin on disc

scholarly journals The Adhesion of CrN Thin Films Deposited on Modified 42CrMo4 Steel

2017 ◽  
Vol 2017 ◽  
pp. 1-14 ◽  
Author(s):  
O. Lupicka ◽  
B. Warcholinski
Keyword(s):  
Shot Peening ◽  
Steel Substrate ◽  
Surface Hardness ◽  
Scratch Test ◽  
Hard Coatings ◽  
X Ray Diffraction ◽  
Nitriding Time ◽  
Crn Coating ◽  
42Crmo4 Steel ◽  
Deposited Films

Here, the effect of adhesion of CrN hard coatings on modified 42CrMo4 steel substrate is presented. Modifications of the substrate are shot peening, nitriding, shot peening, and nitriding joined process. In the shot peening process, two variable process parameters were used: exposure time (t) and air pressure (p). The nitriding process was conducted in the following parameters: nitriding potential Np = 4.86, nitriding time tn = 3 h, and temperature process T = 530°C. Modified substrates were characterized by surface hardness HV5 and hardness profiles on the cross section of samples and by surface roughness parameters. On such prepared substrates, the CrN coating was deposited. The adhesion of CrN coating on modified substrates was defined by the scratch test. Chemical and phase composition of the films was determined using EDS method and X-ray diffraction, respectively. The surface hardness of deposited films was also defined. The substrate of 42CrMo4 steel without mechanical and heat treatment coated by hard CrN film was used as a reference.

Studies about Electrochemical Plating with Zinc - nickel Alloys - the Influence of Deposition Potential on Stoichiometric Composition

2008 ◽  
Vol 59 (9) ◽  
Author(s):  
Violeta Vasilache ◽  
Gheorghe Gutt ◽  
Traian Vasilache
Keyword(s):  
Nickel Alloys ◽  
Stoichiometric Composition ◽  
Nickel Chloride ◽  
Deposition Potential ◽  
X Ray Diffraction ◽  
Pure Zinc ◽  
X Ray ◽  
Nickel Cobalt ◽  
Cobalt Iron ◽  
Electrochemical Plating

The electrochemical deposition of zinc and combinations with elements of the 8th group of the Periodic System (nickel, cobalt, iron) have good properties for anticorrosive protection, compared with pure zinc. For steel pieces, these films delay apparition and formation of white and red iron oxide. We used solutions with different concentrations of zinc chloride, nickel chloride and potassium chloride. To analyze the results we used the optic microscope and the X-ray diffraction.

scholarly journals The Effect of Discharge Current and Pulse-On Time on Biocompatible Zr-based BMG Sinking-EDM

2020 ◽  
Vol 10 (1) ◽  
pp. 401-407
Author(s):  
Yanuar Rohmat Aji Pradana ◽  
Aldi Ferara ◽  
Aminnudin Aminnudin ◽  
Wahono Wahono ◽  
Jason Shian-Ching Jang
Keyword(s):  
Surface Roughness ◽  
Metallic Glasses ◽  
Electrical Discharge ◽  
Material Removal ◽  
Electrical Discharge Machining ◽  
Removal Rate ◽  
Surface Hardness ◽  
Recast Layer ◽  
Surface Evaporation ◽  
Pulse On Time

AbstractThe machinability information of Zr-based bulk metallic glasses (BMGs) are recently limited but essential to provide technological recommendation for the fabrication of the medical devices due to the material’s metastable nature. This study aims to investigate the material removal rate (MRR) and surface roughness under different current and pulse-on time of newly developed Ni- and Cu-free Zr-based BMG using sinking-electrical discharge machining (EDM). By using weightloss calculation, surface roughness test and scanning electron microscopy (SEM) observation on the workpiece after machining, both MRR and surface roughness were obtained to be increased up to 0.594 mm3/min and 5.50 μm, respectively, when the higher current was applied. On the other hand, the longer pulse-on time shifted the Ra into the higher value but lower the MRR value to only 0.183 mm3/min at 150 μs. Contrary, the surface hardness value was enhanced by both higher current and pulse-on time applied during machining indicating different level of structural change after high-temperature spark exposure on the BMG surface. These phenomena are strongly related to the surface evaporation which characterize the formation of crater and recast layer in various thicknesses and morphologies as well as the crystallization under the different discharge energy and exposure time.

The Effect of Bleach Liquid and Household Cleaner on Surface Hardness and Roughness of Acrylic Base of Orthodontic Appliances

2021 ◽  
Author(s):  
Saeed Noorollahian ◽  
Farinaz Shirban ◽  
Vahid Mojiri
Keyword(s):  
Surface Roughness ◽  
Hydrochloric Acid ◽  
Sodium Hypochlorite ◽  
Surface Hardness ◽  
Acrylic Resin ◽  
Liquid Sodium ◽  
P Value ◽  
Orthodontic Appliances ◽  
Acrylic Resins ◽  
Significant Difference

Introduction: The daily use of orthodontic removable plates can interfere with the self-cleansing function of the mouth. Although various techniques have been proposed for cleaning removable orthodontic appliances, there is no consensus on the use of a safe method that preserves the physical properties of the appliance. This study aimed to investigate the effect of using hydrochloric acid (10%, for removal of mineral deposits) and sodium hypochlorite (5.25%, to remove organic matter and discolorations) on surface hardness and roughness of self-cure orthodontic acrylic resins. Materials & Methods: This cross-sectional laboratory study was conducted in the fall of 2017 at Isfahan University of Medical science and Isfahan University of Technology. In this study two orthodontic acrylic resins (Orthocryl® and Acropars®) were used. Eighty samples (12×10×3 mm) from each one were fabricated and divided into four groups (n = 20). Group 1: 15 minutes immersion in household cleaner liquid (Hydrochloric acid, 10%) followed by15 minutes immersion in household bleach liquid (Sodium Hypochlorite, 5.25%). In group 2, immersions were repeated just like group two times and in group 3, were done three times. Group 4 was as control and had no immersion. The surface hardness and roughness of samples were measured. Data were analyzed with Two Way ANOVA and the significance level was set at 0.05. Results: The number of immersion procedures did not significantly affect the surface hardness (p value = 0.958) and surface roughness (p value = 0.657) in the different study groups. There was no significant difference in the surface hardness between the two acrylic resin brands (p value = 0.077); however, Acropars acrylic resin samples exhibited significantly higher surface roughness compared to the Orthocryl acrylic resin samples(p value < 0.001). Conclusion: 15 minutes of immersion in 10% HCl, followed by 15 minutes of immersion in 5.25% NaOCl and repetition of the procedure three times did not significantly affect the surface hardness and roughness of self-cured acrylic resins.

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