Interfacial mechanics of carbonaceous reinforcements in electrophoretically deposited nickel coatings

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.

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Structure and properties of composite nickel coatings deposited with the help of programmable pulsed current under laser irradiation

Physics and Chemistry of Materials Treatment ◽

10.30791/0015-3214-2018-3-34-42 ◽

2018 ◽

pp. 34-42 ◽

Cited By ~ 1

Author(s):

V.V. Tytarenko ◽

◽

V.A. Zabludovsky ◽

E.Ph. Shtapenko ◽

◽

...

Keyword(s):

Laser Irradiation ◽

Pulsed Current ◽

Structure And Properties ◽

Nickel Coatings

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Electroplating of catalytically active nickel coatings from baths of various anionic compositions

Protection of Metals and Physical Chemistry of Surfaces ◽

10.1134/s2070205109060148 ◽

2009 ◽

Vol 45 (6) ◽

pp. 718-723 ◽

Cited By ~ 4

Author(s):

O. V. Dolgikh ◽

N. V. Sotskaya ◽

Vu Thi Duyen ◽

E. A. Kotlyarova ◽

B. L. Agapov

Keyword(s):

Nickel Coatings ◽

Catalytically Active

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Wear protection of a pressure-loaded titanium alloy by lubricated electroless nickel coatings

Wear ◽

10.1016/0043-1648(69)90032-5 ◽

1969 ◽

Vol 14 (1) ◽

pp. 15-32 ◽

Cited By ~ 9

Author(s):

W. Beck ◽

J.F. Danovich

Keyword(s):

Titanium Alloy ◽

Electroless Nickel ◽

Nickel Coatings ◽

Wear Protection

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Micromechanical and structural properties of nickel coatings electrodeposited on two different substrates

Journal of the Serbian Chemical Society ◽

10.2298/jsc0907817l ◽

2009 ◽

Vol 74 (7) ◽

pp. 817-831 ◽

Cited By ~ 5

Author(s):

Jelena Lamovec ◽

Vesna Jovic ◽

Radoslav Aleksic ◽

Vesna Radojevic

Keyword(s):

Structural Properties ◽

Current Density ◽

Composite Structures ◽

Single Crystal Silicon ◽

Crystal Silicon ◽

Nickel Coatings ◽

Electrodeposited Nickel ◽

Cold Rolled ◽

Composite Hardness ◽

Substrate Hardness

Fine-structured nickel coatings were electrodeposited from a sulfamate-based electrolyte onto different substrates: polycrystalline cold-rolled copper and single crystal silicon with (111) orientation. The influence of the substrate layers and chosen plating conditions on the mechanical and structural properties of these composite structures were investigated by Vickers microhardness testing for different loads. Above a certain critical penetration depth, the measured hardness value was not the hardness of the electrodeposited film, but the so-called 'composite hardness', because the substrate also participated in the plastic deformations during the indentation process. Two composite hardness models (Chicot-Lesage and Korsunsky), constructed on different principles, were chosen and applied to the experimental data in order to distinguish film and substrate hardness. The microhardness values of the electrodeposited nickel layers were mainly influenced by the current density. Increasing the current density led to a decrease in grain size, which resulted in higher values of the microhardness.

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Formation of Grain Structures of Thermal Sprayed Nickel Coatings and the Coating Properties

Materials Science Forum ◽

10.4028/www.scientific.net/msf.502.517 ◽

2005 ◽

Vol 502 ◽

pp. 517-0

Author(s):

Kenji Murakami

Keyword(s):

Steel Substrate ◽

Nickel Coatings ◽

Grain Structures ◽

Heat Treated ◽

Columnar Grains ◽

Different Temperatures ◽

Plasma Sprayed ◽

Equiaxed Grains ◽

Sprayed Coatings ◽

Lamellar Interfaces

Pure nickel powder was low pressure plasma sprayed onto a steel substrate held at different temperatures during spraying. The as-sprayed coatings consist of columnar grains whose axes are nearly perpendicular to the lamellae composing the coatings. As the coating temperature becomes higher, the length of the columnar grains increases and is longer than the thickness of the lamellae, indicating the growth of the grains across the lamellar interfaces during spraying. On the other hand, the coatings that were heat treated after spraying consist of coarse equiaxed grains. The coatings that experienced high temperatures during spraying or the heat treated coatings have large porosity and contain large globular pores. The hardness, apparent density and the tensile strength of the coating itself were the highest for the coating prepared at a low temperature and became low on heat treatment. The thermal conductivity in the direction perpendicular to the coating was the largest for the coating that consisted of long columnar grains.

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