Prevention of hydrogen embrittlement using ultra rapid cooling thermal spraying gun

Abstract

Films of crystalline aluminum, titanium, and amorphous alloy prevent hydrogen entry into steel. Thermal spraying is a convenient method for producing coatings on metal substrates. However, as conventional thermal spray coatings have pores and cracks, they cannot prevent hydrogen entry sufficiently. In this study, with the use of new thermal spray guns that enable nitrogen gas cooling, aluminum-magnesium, titanium, amorphous coatings were fabricated and their anti-hydrogen-embrittlement effects were evaluated by a conventional strain rate tensile test. Passivated alumina film on the aluminum-magnesium coating, passivated chromium oxide film on the iron-chromium-based amorphous coating, and generated nitrogen titanium film on the titanium coating were expected to prevent hydrogen entry and hydrogen embrittlement.