Electrochemical behaviour of chromium–graphene composite coating

RSC Advances ◽  
2016 ◽  
Vol 6 (67) ◽  
pp. 62083-62090 ◽  
Author(s):  
Rekha M. Y. ◽  
M. K. Punith Kumar ◽  
Chandan Srivastava
Keyword(s):  
Composite Coating ◽  
Zno Nanoparticles ◽  
Electrochemical Behaviour ◽  
Chromium Coating ◽  
Corrosion Resistant ◽  
Graphene Composite ◽  
Pure Chromium

This work illustrates the role of graphene in enhancing the corrosion resistant properties of chromium–graphene composite coating when compared to the corrosion resistant properties of pure chromium coating containing ZnO nanoparticles.

Electrochemical behavior of Zn–graphene composite coatings

RSC Advances ◽  
2015 ◽  
Vol 5 (32) ◽  
pp. 25603-25608 ◽  
Author(s):  
M. K. Punith Kumar ◽  
Mahander Pratap Singh ◽  
Chandan Srivastava
Keyword(s):  
Electrochemical Properties ◽  
Composite Coating ◽  
Electrochemical Behavior ◽  
Composite Coatings ◽  
Corrosion Resistant ◽  
Graphene Composite

Synthesis and electrochemical properties of highly corrosion resistant Zn–graphene composite coating.

Wear behavior of electrodeposited nickel/graphene composite coating

2021 ◽  
pp. 108589
Author(s):  
Xuesha Li ◽  
Qianqian Shen ◽  
Yu Zhang ◽  
Lili Wang ◽  
Chaoyin Nie
Keyword(s):  
Composite Coating ◽  
Wear Behavior ◽  
Graphene Composite ◽  
Electrodeposited Nickel

scholarly journals Mutagenicity of ZnO nanoparticles in mammalian cells: Role of physicochemical transformations under the aging process

2015 ◽  
Vol 9 (8) ◽  
pp. 972-982 ◽  
Author(s):  
Mei M. Wang ◽  
Yi C. Wang ◽  
Xi N. Wang ◽  
Yun Liu ◽  
Hong Zhang ◽  
...  
Keyword(s):  
Zno Nanoparticles ◽  
Mammalian Cells ◽  
Aging Process

The role of halide ions on the electrochemical behaviour of iron in alkali solutions

2008 ◽  
Vol 254 (8) ◽  
pp. 2325-2330
Author(s):  
S. Nathira Begum ◽  
V.S. Muralidharan ◽  
C. Ahmed Basha
Keyword(s):  
Electrochemical Behaviour ◽  
Halide Ions ◽  
Alkali Solutions

Role of Pristine and Acid-Functionalized Fullerene on Breaking Dye Aggregates and its Impact on the Efficiency of Solar Cells

2014 ◽  
Vol 67 (5) ◽  
pp. 819
Author(s):  
Syed Mujtaba Shah ◽  
Zafar Iqbal ◽  
Muzaffar Iqbal ◽  
Naila Shahzad ◽  
Amina Hana ◽  
...  
Keyword(s):  
Solar Cells ◽  
Zno Nanoparticles ◽  
Self Assembly ◽  
Zno Nanorods ◽  
Active Material ◽  
Dye Sensitized Solar Cells ◽  
Dye Sensitized ◽  
Transmission Electron ◽  
Sensitized Solar Cells

Porphyrin dyes have an inherent tendency to aggregate. This leads to a self-quenching phenomenon that hinders electron transfer to the conduction band of semiconductors in dye-sensitized solar cells. Self-quenching adversely affects the efficiency of solar cells. Here, we report the interaction of porphyrin with pristine and acid-functionalized fullerene molecules on the surface of ZnO nanoparticles under chemisorbed conditions. Chemisorption of porphyrin only on ZnO nanoparticles instigates aggregation of the porphyrin molecules. These aggregates can be effectively broken by chemisorbing fullerene molecules on the surface of the ZnO nanoparticles. This is due to self-assembly formation processes because of porphyrin–fullerene interactions. The nanohybrid material, consisting of ZnO nanorods, acid-functionalized porphyrin, and fullerene derivatives, was characterized by UV–visible spectroscopy, fourier transform infrared spectroscopy, fluorescence spectroscopy, and transmission electron microscopy. The material generates better performing dye-sensitized solar cells when compared with those fabricated from porphyrin-based photo-active material.

Aspects of Applying Hard Chromium Coatings on the Inner Surfaces of Components for Hydraulic Drives with Hydrostatic Guideways

2021 ◽  
Vol 316 ◽  
pp. 827-832
Author(s):  
D. V. Ardashev ◽  
L.V. Shipulin ◽  
A.S. Degtyareva-Kashutina
Keyword(s):  
Hydraulic Cylinder ◽  
Chromium Coating ◽  
Optimal Composition ◽  
Chromic Anhydride ◽  
Corrosion Resistant ◽  
Distinctive Features ◽  
Wear Resistant Coatings ◽  
Hard Chromium ◽  
Chromium Plating ◽  
Plating Method

We considered the processes of chromium plating the inner surfaces of the components of cylinders with hydrostatic guideways. We demonstrated the various aspects of the chromium plating process – the limitations placed on the machinery depending on the dimensions of the parts to be plated and the unevenness of the deposition rate of chromium along the length of the part. We developed a diagram of an installation for the application of a hard chromium coating on inner surfaces, which includes a cathode, an anode, a tank, and a pipeline. The distinctive features of the installation are the method of supplying the electrolyte at an angle to the horizontal, which allows us to supply the electrolyte through a turbulent flow swirling along a helical path, and the use of a chromium-plated installation casing. We studied various modes for applying a hard chromium coating on the inner surfaces of a hydraulic cylinder. As a result, we determined the optimal composition of the chromium electrolyte – the ratio of chromic anhydride and sulfuric acid – which is 10:1, respectively, and experimentally selected deposition modes. Chromium coatings obtained through the use of the concentrated electrolyte, which we developed, and the chromium plating method have 5...20% greater hardness and a 10...30-times reduction in porosity with the formation of a shiny, lumpy sludge, which corresponds to corrosion-resistant and wear-resistant coatings needed to manufacture hydraulic drives with highly efficient hydrostatic guideways.

scholarly journals The Roll of NaPSS Surfactant on the Ceria Nanoparticles Embedding in Polypyrrole Films

2016 ◽  
Vol 2016 ◽  
pp. 1-12 ◽  
Author(s):  
Simona Popescu ◽  
Mihaela Mîndroiu ◽  
Daniela Cabuzu ◽  
Cristian Pîrvu
Keyword(s):  
Cerium Oxide ◽  
Antibacterial Effect ◽  
Electrochemical Behaviour ◽  
Titanium Substrate ◽  
Crystalline Form ◽  
Polymeric Films ◽  
Ceria Nanoparticles ◽  
Polypyrrole Films ◽  
Polymerization Conditions

Cerium oxide nanoparticles (CeO2NPs) in crystalline form have been synthesized by a coprecipitation method. CeO2nanoparticles were then embedded in polypyrrole (PPy) films during the electropolymerization of pyrrole (Py) on titanium substrate. The influence of poly(sodium 4-styrenesulfonate) (NaPSS) surfactant used during polymerization on the embedding of CeO2NPs in polypyrrole films was investigated. The new films were characterized in terms of surface analysis, wettability, electrochemical behaviour, and antibacterial effect. The surface and electrochemical characterization revealed the role of surfactant on PPy doping process cerium oxide incorporation. In the presence of surfactant, CeO2NPs are preferentially embedded in the polymeric film while, without surfactant, the ceria nanoparticles are quasiuniformly spread as agglomerates onto polymeric films. The antibacterial effect of studied PPy films was substantially improved in the presence of cerium oxide and depends by the polymerization conditions.

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