scholarly journals ZINC - NICKEL COATING AND ITS CHARACTERIZATION BY RF-GDOES AND EDX ANALYSIS

2019 ◽  
Author(s):  
Jiřina VONTOROVÁ ◽  
Petra VÁŇOVÁ ◽  
Kateřina KONEČNÁ ◽  
Karolina SLAMOVÁ ◽  
Petr MOHYLA
Keyword(s):  
Nickel Coating ◽  
Edx Analysis ◽  
Zinc Nickel

scholarly journals Study of Hillock and Zinc Whisker Evolution in Five Different Cable Tray Coatings

Metals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 325
Author(s):  
Borja Arroyo ◽  
Marion Roth ◽  
José Alberto Álvarez ◽  
Ana Isabel Cimentada ◽  
Sergio Cicero ◽  
...  
Keyword(s):  
Nickel Coating ◽  
Alkaline Electrolyte ◽  
Steel Wires ◽  
Base Steel ◽  
Bending Stresses ◽  
Zinc Electrolyte ◽  
The Subject ◽  
Whisker Density ◽  
Zinc Coatings ◽  
Zinc Nickel

The main objective of this work is the study of the hillock and zinc whisker evolution of five different commercial zinc coatings applied on the same base steel wires of the patented EASYCONNECT system cable trays manufactured by VALDINOX Ltd.: white zinc alkaline electrolyte, yellow zinc trivalent electrolyte, acid zinc electrolyte, hot dip galvanized, and zinc nickel coating. The limited literature on the subject is summarized, and then the coating thickness, chemical composition, hardness and surface rugosity are characterized. The hillock and whisker density evolution are evaluated over a period of 12 months, considering the presence of compression bending stresses. It is concluded that the white alkaline and yellow trivalent coatings are the most affected, while the zinc-nickel shows the best behavior with no presence of whiskers; the acid zinc electrolyte also shows good results despite the delayed appearance of whiskers from the ninth month; the hot-dip galvanized coating does not show any presence of zinc whiskers or hillocks.

Effect of zinc nickel coating on properties of Nitrided AISI 1040 steel

2019 ◽  
Vol 6 (8) ◽  
pp. 086547
Author(s):  
M S Kumar ◽  
S Ragunathan ◽  
P Shenbaga Velu ◽  
M Suresh ◽  
V R Srinivashan ◽  
...  
Keyword(s):  
Nickel Coating ◽  
Zinc Nickel

Protection des aciers par des revêtements de zinc-nickel réalisés par électrolyse au tampon

1995 ◽  
Vol 83 (7-8-9) ◽  
pp. 33-36
Author(s):  
Sylvie Claverie ◽  
J. Reby ◽  
B. Sutter ◽  
G. Vasseur
Keyword(s):  
Zinc Nickel

Influence of the Zinc Sublayer Method Production and Heat Treatment on the Microhardness of the Composite Ni-Al2O3 Coating Deposited on the 5754 Aluminium Alloy

2014 ◽  
Vol 59 (1) ◽  
pp. 355-358
Author(s):  
M. Karaś ◽  
M. Nowak ◽  
M. Opyrchał ◽  
M. Bigaj ◽  
A. Najder
Keyword(s):  
Heat Treatment ◽  
Aluminium Alloy ◽  
Thermal Shock ◽  
Nickel Coating ◽  
Nickel Sulphate ◽  
Al2o3 Coating ◽  
Nickel Coatings ◽  
Watts Bath ◽  
Before And After ◽  
Zinc Interlayer

Abstract In this study, the effect of zinc interlayer on the adhesion of nickel coatings reinforced with micrometric Al2O3 particles was examined. Nickel coating was applied by electroplating on EN AW - 5754 aluminium alloy using Watts bath at a concentration of 150 g/l of nickel sulphate with the addition of 50 g/l of Al2O3. The influence of zinc intermediate coating deposited in single, double and triple layers on the adhesion of nickel coating to aluminium substrate was also studied. The adhesion was measured by the thermal shock technique in accordance with PN-EN ISO 2819. The microhardness of nickel coating before and after heat treatment was additionally tested. It was observed that the number of zinc interlayers applied does not significantly affect the adhesion of nickel which is determined by thermal shock. No defect that occurs after the test, such as delamination, blistering or peeling of the coating was registered. Microhardness of the nickel coatings depends on the heat treatment and the amount of zinc in the interlayer. For both single and double zinc interlayer, the microhardness of the nickel coating containing Al2O3 particles increased after heat treatment, but decreased when a triple zinc interlayer was applied.

ELECTROLESS NICKEL

Alloy Digest ◽  
1986 ◽  
Vol 35 (4) ◽  
Keyword(s):  
Nickel Coating ◽  
Chemical Reduction ◽  
Electroless Nickel ◽  
Heat Treating ◽  
Corrosion And Wear ◽  
Sodium Hypophosphite ◽  
Work Piece ◽  
Nickel Ions ◽  
Continuous Contact ◽  
Chemical Corporation

Abstract ELECTROLESS NICKEL is a nickel coating deposited by chemical reduction of nickel ions. The most widely used reducing agent is sodium hypophosphite. The thickness of the deposited coating is uniform over all areas of the work-piece that are in continuous contact with fresh plating solution. The process is applicable to a wide variety of metal and nonmetal substrates. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion and wear resistance as well as heat treating and joining. Filing Code: Ni-332. Producer or source: Occidental Chemical Corporation.

Electrochemical Mechanism of Nickel and Zinc-Nickel Alloy Electrodeposition

2010 ◽  
Vol 2 (1) ◽  
pp. 1-5 ◽  
Author(s):  
T. Vasilache ◽  
S. Gutt ◽  
I. Sandu ◽  
V. Vasilache ◽  
G. Gutt ◽  
...  
Keyword(s):  
Nickel Alloy ◽  
Alloy Electrodeposition ◽  
Electrochemical Mechanism ◽  
Zinc Nickel

Boron insertion into alkyl ether bonds via zinc/nickel tandem catalysis

Science ◽  
2021 ◽  
Vol 372 (6538) ◽  
pp. 175-182
Author(s):  
Hairong Lyu ◽  
Ilia Kevlishvili ◽  
Xuan Yu ◽  
Peng Liu ◽  
Guangbin Dong
Keyword(s):  
Nickel Catalyst ◽  
Bioactive Compounds ◽  
Cyclic Ethers ◽  
Alkyl Ether ◽  
Tandem Catalysis ◽  
Mechanistic Studies ◽  
Alkyl Ethers ◽  
Nitrogen Substitution ◽  
Zinc Nickel

Mild methods to cleave the carbon-oxygen (C−O) bond in alkyl ethers could simplify chemical syntheses through the elaboration of these robust, readily available precursors. Here we report that dibromoboranes react with alkyl ethers in the presence of a nickel catalyst and zinc reductant to insert boron into the C−O bond. Subsequent reactivity can effect oxygen-to-nitrogen substitution or one-carbon homologation of cyclic ethers and more broadly streamline preparation of bioactive compounds. Mechanistic studies reveal a cleavage-then-rebound pathway via zinc/nickel tandem catalysis.

Sign in / Sign up

Export Citation Format

Share Document