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采用气相渗透法测定了Cr18Ni10Ti奥氏体合金管材的氢扩散系数.设计了合适的测试装置,测试温度范围为360-600℃.分别对内表面涂铝及未涂铝的管材样品进行了中、高温度氢扩散系数测试.用有限差分方法计算了管材样品氢渗透曲线和氢扩散系数-特征时间曲线,从而能够处理扩散系数的测试数据.涂铝管材的室温氢扩散系数为5.789×10-20m2/s,氢扩散激活能为8.144×104/mol,分别比未涂铝管材低5-6个数量级和高1倍.
Hydrogen diffusion coefficient of Cr18Ni10Ti austenitic alloy pipe was measured by gas-permeation method.A suitable testing device was designed and the test temperature was in the range of 360-600 ℃ .The inner and outer surfaces of aluminum-coated and uncoated pipe were tested respectively, Hydrogen diffusion coefficient test at high temperature.The hydrogen permeation curve and hydrogen diffusion coefficient-characteristic time curve of the pipe samples were calculated by the finite difference method so as to be able to deal with the test data of the diffusion coefficient.The hydrogen diffusion coefficient at room temperature of the coated aluminum pipe was 5.789 × 10-20m2 / s, the activation energy of hydrogen diffusion is 8.144 × 104 / mol, which is 5-6 orders of magnitude lower and 1 times higher than that of uncoated aluminum pipe respectively.