MEASUREMENTS OF HYDROGEN DIFFUSION COEFFICIENT FOR TUBE SAMPLES AT MEDIUM AND HIGH TEMPERATURES
LIU Shi; ZHENG Hua; GUI Quanhong; MA Aihua; YU Hongbo; WANG Longbao
Institute of Metal Research; The Chinese Academy of Sciences; Shenyang 110016
Cite this article:
LIU Shi; ZHENG Hua; GUI Quanhong; MA Aihua; YU Hongbo; WANG Longbao. MEASUREMENTS OF HYDROGEN DIFFUSION COEFFICIENT FOR TUBE SAMPLES AT MEDIUM AND HIGH TEMPERATURES. Acta Metall Sin, 2004, 40(4): 393-398 .
Abstract By using a specially designed device and gas permeation method, the hydrogen diffusion coefficients for the tube--shape samples
of Cr18Ni10Ti austenite steel were measured. The testing temperature covers the range of 360---600℃. The curves of hydrogen permeation
flux and the relation of hydrogen diffusion coefficients and specific time were simulated by finite difference method (FDM). According to the simulated curves the experiment data related to the hydrogen diffusion
coefficients can be treated. The hydrogen diffusion coefficients for
aluminum film inner coated tubes at room temperature is 5.789X10 -20 m2/s, its activation energy of hydrogen
diffusion is 8.144X10 -20 J/mol, which are 5---6 orders lower and 1 times higher than those of uncoated tubes respectively.
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