Le diagramme Al-Cr-Zn à 460 C

Résumé
Today the baths of galvanisation contain different chemical elements: zinc, but also aluminium, iron and chromium. To understand the formation of solid phases and the reactions that take place in the molten zinc bath, the zinc rich corner of the quaternary diagram Fe-Zn-Al-Cr has to be investigated. The base of this quaternary diagram is composed by three ternary diagrams: Fe-Al-Zn, Fe-Cr-Zn and Al-Cr-Zn, the two first were already known, but not the last one. The main purpose of this study is the exploration of the ternary diagram Al-Cr-Zn with different experiences: immersion of chromium in aluminium added zinc bath, PVD of zinc on a Al-Cr alloy, galvanizing procedure, mechanical alloying, evaporation of zinc. Each new ternary phase is characterized by EDS and XRD. This experimental results allows the optimization of this ternary diagram by the modelisation software Thermo-Calc.