New insight into the loss of adhesion of ZnMg-Zn bi-layered coatings on steel substrates
| Autor: | Edzo Zoestbergen, R. J. Westerwaal, S. Sabooni, J.Th.M. De Hosson, Emad Galinmoghaddam, Huatang Cao, Yutao Pei |
|---|---|
| Přispěvatelé: | Advanced Production Engineering |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Annealing (metallurgy) Intermetallic chemistry.chemical_element 02 engineering and technology Zinc engineering.material Annealing treatment 01 natural sciences Paint adhesion testing Adhesion strength Coating 0103 physical sciences Materials Chemistry Composite material Scratch test 010302 applied physics Adhesion loss Surfaces and Interfaces General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics ZnMg-Zn bi-layered coating Surfaces Coatings and Films chemistry engineering Thickness of Zn interlayer 0210 nano-technology Bi layered |
| Zdroj: | Surface & Coatings Technology, 370, 35-43. Elsevier Science |
| ISSN: | 0257-8972 |
| Popis: | In this research, physically vapor deposited Mg Zn and ZnMg Zn bi-layered coatings were annealed at 180 °C for different annealing times to study the origin of the adhesion loss during heat treatment. In the case of Mg Zn bi-layered coatings, it was observed that MgZn2 and Mg2Zn11 intermetallics are formed during annealing from Zn and Mg by diffusion, which results in a reduction of the thickness of the initial pure zinc interlayer. In the case of ZnMg Zn bi-layered coating, the “interfacial adhesion strength” at the ZnMg/Zn interface was quantified by using scratch test. The novel finding is that the adhesion strength of as-deposited coatings at the interface of ZnMg/Zn is independent of the thickness of the zinc interlayer (tZn). tZn decreases gradually during annealing at 180 °C. The “adhesion performance” of the studied coatings, as tested by BMW crash adhesion test (BMW AA-M223), drops drastically when tZn is less than a threshold (~ 500 nm). The obtained results indicate that tZn plays the significant role in the adhesion performance of ZnMg Zn bi-layered coatings. |
| Databáze: | OpenAIRE |
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