1. bookVolume 118 (2021): Issue 1 (January 2021)
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20 May 2020
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access type Open Access

The formation of zinc coatings in nanocrystallised zinc powders

Published Online: 12 Jul 2021
Page range: -
Received: 08 Mar 2021
Accepted: 30 Jun 2021
Journal Details
License
Format
Journal
First Published
20 May 2020
Publication timeframe
1 time per year
Languages
English
Abstract

The kinetics of and mechanism for galvanising low-carbon steel (0.2% C) were examined in powder media which were pre-treated to obtain a fine nanostructured ZnO layer on the surface of zinc powder particles. The effective diffusion coefficient of Zn atoms through the ZnO shell was estimated to be in the order of 1·10−10 m2·s−1. The contribution of the Zn-gas evaporation/condensation microprocesses, which could occur in relation to the above diffusion through a nanostructured surface layer, was evaluated with numerical calculations in the temperature range of 550–950 K and for an average particle size of ZnO up to 100 nm. Our results suggest that the outward diffusion of metallic zinc takes place from the core of powder microparticles across the nano-grain boundaries of their modified surface layer, and can be further intensified by the presence of other inter-phase defects, such as nano-porosity.

Keywords

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