NDLI: Growth Kinetics and Structure of Zr4/Cr3 Based Conversion Coating over Aluminium

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Growth Kinetics and Structure of Zr4/Cr3 Based Conversion Coating over Aluminium

Content Provider	Semantic Scholar
Author	Thirupathi, Kalaivanan Bárczy, Pál Lassú, Gábor
Copyright Year	2016
Abstract	In this study, the structure of Zr4/Cr3 based conversion coating on aluminium alloys was studied by using the Glow Discharge – Optical Emission Spectroscopy (GD-OES) method. Samples were examined before and after exposure to high vacuum. The results revealed that the structure of the coating has two different phases, solute and gelatinous state. The growth kinetics of conversion coating is investigated by considering the thickness of the coating under various immersion times inside the coating bath. The present data suggest that coating growth kinetics has five different states, namely activation, linear growth, limited growth, saturation limit and detachment state. The conversion coating structure over aluminium alloys such as AA2024 and AA6082 was investigated in detail to understand the influence of the substrate in coating formation. The results imply that the formation mechanism strongly depends on alloying elements of the substrate. Conversion layer growth involves dissolution and deposition of ions. It was found that the alloying elements have a slowdown influence on aluminium dissolution. The results imply that high alloyed aluminium tends to form a coating with less thickness and lower Zr-Cr concentration. 1Institute of Ceramics and Polymer Engineering, University of Miskolc, Miskolc, Hungary. 2Matmod Ltd., Miskolc, Hungary. 3Institute of Metallurgy, University of Miskolc, Miskolc, Hungary. *Corresponding author
File Format	PDF HTM / HTML
DOI	10.24274/fn.2016.a15
Alternate Webpage(s)	http://www.onecentralpress.com/wp-content/uploads/2018/01/JOURNAL-OF-FUNCTIONAL-NANOSTRUCTURES-Paper-15.pdf
Alternate Webpage(s)	https://doi.org/10.24274/fn.2016.a15
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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