450 °C Isothermal Section of the Fe-Zn-Si Ternary Phase Diagram

Control of Silicon Reactivity in General Galvanizing

“…However, their proposal is in contradiction to a well-documented experimental observation that the d phase disintegrated into a phase mixture referred to as diffused d when it was exposed to the Si-containing liquid phase. [13] In view of its importance to the galvanizing industry, the Zn-Fe-Si system was revisited by Su et al [5] These researchers explored the Zn-rich corner in great detail and confirmed all phase equilibrium states originally proposed by Köster. [9] The Zn-rich corner of the 450°C isothermal section of the Zn-Fe-Si system, proposed by Su et al, is reproduced in Fig.…”

“…However, galvanizing Si-containing steels has been a technical challenge for batch galvanizers. [2][3][4][5][6][7] The coatings become abnormally thick and non-uniform. They are brittle and poorly adherent to the steel substrates.…”

“…3 The Zn-rich corner of the 450°C isothermal section of the Zn-Fe-Si phase diagram. [5] Note the co-existence of the liquid and d phases is thermodynamically prohibited Fig. 2 The binary Zn-Fe phase diagram [1] crystallites.…”

“…[2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] The problem has been extensively explored and well-described phenomenally. Some practical solutions to the problem have emerged as a result of those investigations, including high temperature galvanizing and the aforementioned Technigalva, that is, Ni addition to the bath.…”

Ternary Phase Equilibria at 450 °C in the Zn-Fe-P System

“…Each alloy mixture was heated to a temperature above its liquidus temperature and kept at this temperature for 2 days and was then quenched in water to minimize Zn loss and obtain a relatively compact sample. A bottom-quenching technique that has been reported in detail elsewhere [21] was used. The Basic and Applied Research: Section I samples were sealed again and annealed at 450°C for 60 days, then quenched into water at the end of the treatment.…”