Charakterisierung von Mikrorissen in Zn-Al-Mg-Beschichtungen

Translated title of the contribution: Characterisation of microcracks in Zn-Al-Mg-layers

Gerald Ressel

Research output: ThesisDiploma Thesis

Abstract

Steel is the most important construction material in the building industry. To reduce corrosion zinc coatings are applied. The most important production process for these coatings is the continuous hot-dip galvanizing process. A rather new development for metallic steel coatings is an alloy based an the Zn-Al-Mg-system. These alloys show a better corrosion performance than the classic zinc layers. However, they are more brittle compared to pure zinc-coatings and at deformations during subsequent processing a different development formation of microcracks can occur. The aim of this work is to evaluate the microcracking behaviour of various Zn-Al-Mg-coatings. The coating-process was carried out by a hot dip galvanizing simulator. A Stepwise stretching of the samples and the evaluation of the microcracks took place in order to track the formation and propagation of the microcracks. For investigations, on the microstructure a scanning electron microscope was used. The number of microcracks increased with higher contents of magnesium and decreased with the aluminium content. A higher layer thickness affected a development of more microcracks. The hardness of the layer grew with increasing aluminium and magnesium content.
Translated title of the contributionCharacterisation of microcracks in Zn-Al-Mg-layers
Original languageGerman
QualificationDipl.-Ing.
Supervisors/Advisors
  • Antrekowitsch, Helmut, Supervisor (internal)
Award date25 Jun 2010
Publication statusPublished - 2010

Bibliographical note

embargoed until null

Keywords

  • Zn-Al-Mg-layer microcrack galvanizing

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