| dc.contributor.author | Barčová, Karla | |
| dc.contributor.author | Mašláň, Miroslav | |
| dc.contributor.author | Zbořil, Radek | |
| dc.contributor.author | Filip, Jan | |
| dc.contributor.author | Podjuklová, Jitka | |
| dc.contributor.author | Hrabovská, Kamila | |
| dc.contributor.author | Schaaf, P. | |
| dc.date.accessioned | 2007-03-27T11:10:37Z | |
| dc.date.available | 2007-03-27T11:10:37Z | |
| dc.date.issued | 2006 | |
| dc.identifier.citation | Surface and Coatings Technology. 2006, vol. 201, issues 3-4, p. 1836-1844. | en |
| dc.identifier.issn | 0257-8972 | |
| dc.identifier.uri | http://hdl.handle.net/10084/59880 | |
| dc.language.iso | en | en |
| dc.publisher | Elsevier | en |
| dc.relation.ispartofseries | Surface and Coatings Technology | en |
| dc.relation.uri | https://doi.org/10.1016/j.surfcoat.2006.03.015 | en |
| dc.subject | enamel | en |
| dc.subject | Mössbauer spectroscopy | en |
| dc.subject | electron microprobe | en |
| dc.subject | interfaces | en |
| dc.subject | iron oxide | en |
| dc.subject | steel surface | en |
| dc.title | Phase composition of steel–enamel interfaces: Effects of chemical pre-treatment | en |
| dc.type | article | en |
| dc.identifier.location | Není ve fondu ÚK | en |
| dc.description.abstract-en | Mössbauer spectroscopy in transmission geometry, performed simultaneously with conversion X-ray, and conversion electron Mössbauer spectroscopy, X-ray powder diffraction and electron microprobe analysis (EMPA), have been used to monitor the effects of a chemical pre-treatment on the phase composition of a “steel–enamel interface” of a hot-rolled steel surface formed during a thermally induced coating process. In this comparative study, we have analysed both an untreated sample and a treated sample of a steel sheet with the surface pickled by dilute H2SO4 and passivated in Na2CO3 solution. A continuous magnetite layer covering the steel surface as a result of the chemical pre-treatment was identified by backscattering Mössbauer spectroscopy and EMPA. During a fusion process, well crystalline fayalite (Fe2SiO4) is formed at the phase boundary by the solid-state reaction of magnetite with the SiO2-based enamel matrix. Wüstite (FeO) was detected as a product of oxidation of iron under the magnetite layer of the chemically pre-treated sample, whereas hematite represents a product of oxidation of magnetite. This wüstite–magnetite–(hematite)–fayalite layered interface is rimmed by isometric metallic intricate network-forming particles with a composition of about Fe0.95Ni0.05 and which are related to a diffusion–reduction process of iron and/or to a reduction of Fe3+ in glass. In the case of chemically untreated steel, EMPA revealed a sharp phase boundary, rimmed again by Fe-based metallic particles. Magnetite covered by fayalite was occasionally observed in a few areas of the phase boundary. The presence of magnetite at the interface of the chemically untreated sample is due to a thermally induced air-oxidation of the α-Fe steel surface during an enamelling procedure. The surprising effect of the chemical pre-treatment, resulting in a lowering of adhesion of enamel on the steel surface, is discussed. | en |
| dc.identifier.doi | 10.1016/j.surfcoat.2006.03.015 | |
| dc.identifier.wos | 000244477300181 | |