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本文应用金——气反应过程动力学的基本原理,对惰性熔化法中金属试样放出氢的限制性环节进行讨论。结果表明,熔池中氢的放出过程的限制环节是氢在金——气边界层的传质过程,这一结论由铃木等人的试验结果所证实。该结论原则上适用予所有惰性气氛熔化法中氢的释放过程。以钢样为例计算氢的传质系数与实验值相符。本试验条件下,在氩气流下熔化的钢样中氢含量与释放时间的关系为 [%H]_1=2.5×10~(-3)exp(-12.85×10~(-3t))由该式可求出某时刻钢样中氢的浓度,并可确定氢完全释放所需时间。通过绘制氢的释放动力学曲线,能够计算钢样中不同含氢量时的放氢速度。在一定分析条件下制定的动力学曲线及氢的瞬时浓度与释放时间曲线有实际参考价值,可用于掌握试样的放氢动态。
In this paper, the basic principle of the kinetics of gold-gas reaction process is used to discuss the restrictive aspects of the release of hydrogen from the metal sample in the inert melting method. The results show that the limiting part of the hydrogen evolution in the weld pool is the mass transfer of hydrogen at the gold-gas boundary layer. This conclusion is confirmed by the experimental results of Suzuki et al. This conclusion applies in principle to the release of hydrogen in all inert atmosphere melting processes. Taking the steel sample as an example, the mass transfer coefficient of hydrogen is in agreement with the experimental value. Under the experimental conditions, the relationship between the hydrogen content and the release time in the molten steel samples under argon flow is [% H] _1 = 2.5 × 10 -3 exp (-12.85 × 10 -3 t) Formula can be calculated at some time the concentration of hydrogen in the steel, and can determine the time required for the complete release of hydrogen. By plotting the release kinetics of hydrogen, the rate of hydrogen evolution at different hydrogen levels in the steel sample can be calculated. Under certain analytical conditions, the kinetic curve and the instantaneous concentration of hydrogen and the release time curve have practical reference value, which can be used to grasp the dynamic discharge of the sample.