Electrodeposition of an aluminum coating on a graphite surface from a molten AlCl<sub>3</sub>-NaCl-KCl mixture

CAO Rui-xiong; TAO Ze-chao; WANG Hong-bao; GUO Quan-gui

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Article Navigation > New Carbon Mater. > 2015 > 30(3): 282-288

CAO Rui-xiong, TAO Ze-chao, WANG Hong-bao, GUO Quan-gui. Electrodeposition of an aluminum coating on a graphite surface from a molten AlCl3-NaCl-KCl mixture. New Carbon Mater., 2015, 30(3): 282-288.

Citation:

CAO Rui-xiong, TAO Ze-chao, WANG Hong-bao, GUO Quan-gui. Electrodeposition of an aluminum coating on a graphite surface from a molten AlCl₃-NaCl-KCl mixture. New Carbon Mater., 2015, 30(3): 282-288.

CAO Rui-xiong, TAO Ze-chao, WANG Hong-bao, GUO Quan-gui. Electrodeposition of an aluminum coating on a graphite surface from a molten AlCl3-NaCl-KCl mixture. New Carbon Mater., 2015, 30(3): 282-288.

Citation:

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Electrodeposition of an aluminum coating on a graphite surface from a molten AlCl₃-NaCl-KCl mixture

1.
Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China;
2.
University of Chinese Academy of Sciences, Beijing 100049, China

Funds: National Natural Science Foundation of China(51303198);Young Scientist of SXICC(2011SQNRC11).

Received Date: 2015-02-20
Accepted Date: 2015-09-07
Rev Recd Date: 2015-06-01
Publish Date: 2015-06-28

Abstract

Abstract

An electrochemical method was used to deposit aluminum on a graphite plate in a molten NaCl-KCl-AlCl₃ mixture with a weight ratio of 1:1:8 to form a coatings with different thicknesses. The thickness and morphology of the coating were controlled by the current density and electrochemical deposition time. Results indicated that the thickness of the coating increased with deposition time up to 240 min at a current density of 1.06 A/dm² and a dendritic structure coating was formed by increasing the deposition time beyond 300 min. The greater the current density, the faster the deposition rate. When the current density was increased to 3.28 A/dm², the thickness of the coating reached a maximum of 148 μm for an electrochemical deposition time of 120 min. Excellent adhesion strength between the aluminum coating and graphite substrate was proved by thermal shock resistance and scratch hardness tests. The thermal conductivity of the samples was increased significantly from an initial value of 115.7 to 199.0 W/(m·K).
- Electrochemical deposition,
- Molten salt,
- Graphite,
- Aluminum,
- Adhesion stress,
- Thermal conductivity

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References(17)

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