Study on the bulk diffusion of hydrogen in stainless steels

The concentration of hydrogen in stainless-steel cylinders that had been ex posed to hydrogen gas many times was calculated, based on the diffusion equ ation and the numerical method of finite difference. The concentration of h ydrogen in 316L and 22-13-5 stainless-steel cylinders that had been exposed to hydrogen gas at temperatures of 400 degrees C and 740 degrees C and sto red in air at room temperature were determined by SIMS to test the calculat ion. The calculation was in good agreement with determination. Some discuss ions on the hulk diffusion of hydrogen are made in this report. Copyright ( C) 1999 John Whey & Sons, Ltd.