NDLI: Sealing Treatment of Aluminum Coating on S235 Steel with Thermal Diffusion of Zinc

Content Provider	Springer Nature Link
Author	Wang, Yong Zhang, Timing Zhao, Weimin Tang, Xiuyan
Copyright Year	2015
Abstract	The study introduced a thermal diffusion sealing treatment for arc-sprayed aluminum coating on S235 carbon steel. The sprayed aluminum-zinc duplex coating was heated to 420 °C, so that the low-melting-point zinc could diffuse into the pores of the aluminum coating. Optical microscope, microhardness, electron probe microanalysis, and x-ray diffraction were used to evaluate the sealing treatment. The calculated diffusion coefficient for zinc in the arc-sprayed aluminum coating was approximately 7.735 × 10$^{−9}$ cm$^{2}$/s. The diffused zinc could increase the compactness and microhardness of the aluminum coating. Nevertheless, adverse interface reactions could destroy the coating if the zinc made contact with the steel substrate. FeZn$_{10}$ could form initially, and then the heat from the exothermic reactions between zinc and iron would initiate the reactions among iron, aluminum, and zinc. FeAl-Zn$_{ x }$, FeAl$_{2}$-Zn$_{ x }$, and Fe$_{2}$Al$_{5}$-Zn$_{ x }$ were generated following FeZn$_{10}$. The defected structures were mainly composed of Fe$_{2}$Al$_{5}$-Zn$_{ x }$ and FeZn$_{10}$. All of these formed tough, brittle, intermetallics that have a negative effect on the coating performance. Thus, the contact between zinc and the steel substrate should be avoided, and the holding time should be restricted to 8.16 × 10$^{6}$ L $^{2}$ to prevent the generation of intermetallics.
Starting Page	1052
Ending Page	1059
Page Count	8
File Format	PDF
ISSN	10599630
Journal	Journal of Thermal Spray Technology
Volume Number	24
Issue Number	6
e-ISSN	15441016
Language	English
Publisher	Springer US
Publisher Date	2015-07-15
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	aluminum coating interface reaction mechanism intermetallics sealing treatment thermal diffusion Surfaces and Interfaces, Thin Films Tribology, Corrosion and Coatings Characterization and Evaluation of Materials Operating Procedures, Materials Treatment Analytical Chemistry
Content Type	Text
Resource Type	Article
Subject	Surfaces, Coatings and Films Materials Chemistry Condensed Matter Physics

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