Fundamentals of Hydrogen Solubility in Calcium-Alumino-Silicate Molten Fluxes Containing NaF

Chung, Sung Hoon; Sohn, Il

doi:10.1007/s11663-018-1495-1

Cited by 5 publications

(1 citation statement)

References 27 publications

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“…log C OH = 12.04 − 32.63Λ + 32.71Λ 2 − 6.62Λ 3 (8) An increase in the basicity index of the slag and hydroxyl capacity can be achieved by adding CaF 2 and cryolite Na 3 AlF 6 , which decrease the melting point, viscosity, hydrogen permeability, and density of the slag system [36][37][38][39][40][41]. The increase in slag basicity and the presence of ion Felevate the solubility of water vapor and promote the ionic binding of the hydrogen atom in OH hydroxyl groups, which leads to a decrease in the content of diffusible hydrogen [42]. The subsequent binding of hydroxyl groups OH is possible in the polymerization of AlF 6…”

Section: Introductionmentioning

confidence: 99%

Metallurgical Model of Diffusible Hydrogen and Non-Metallic Slag Inclusions in Underwater Wet Welding of High-Strength Steel

Parshin

Levchenko²,

Maystro

2020

Metals

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High susceptibility to cold cracking induced by diffusible hydrogen and hydrogen embrittlement are major obstacles to greater utilization of underwater wet welding for high-strength steels. The aim of the research was to develop gas–slag systems for flux-cored wires that have high metallurgical activity in removal of hydrogen and hydroxyl groups. Thermodynamic modeling and experimental research confirmed that a decrease in the concentration of diffusible hydrogen can be achieved by reducing the partial pressure of hydrogen and water vapor in the vapor–gas bubble and by increasing the hydroxyl capacity of the slag system in metallurgical reactions leading to hydrogen fluoride formation and ionic dissolution of hydroxyl groups in the basic fluorine-containing slag of a TiO2–CaF2–Na3AlF6 system.

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