本文采用正电子湮没技术研究了高纯Fe中的氢损伤规律,实验结果表明,在0.5mol/L H_2SO_4溶液中不加毒化剂电解充氢时,产生氢损伤的临界电流密度为20 mA/cm~2;而在0.5mol/L H_2SO_4溶液中加少量As_2O_3作为毒化剂电解充氢时,即使很小的电流密度也会产生氢损伤,配合慢拉伸试验,还发现试样内部产生氢损伤以后,它将控制随后的形变和断裂过程
Hydrogen damage in Fe of 99.99% purity has been investigated by Doppler broadening measurement. Experimental results show that when the iron is charged with hydrogen in 0.5 mol / L H_2SO_4 so-lution, the critical current density to cause hydrogen damage is 20 mA / cm~2. While a little As_2O_3, saying 250 mg / L, added to H_2SO_4 solution, even rather small current density, <0.2 mA / cm~2, would cause hydrogen damage. With the help of slow tensile test, it revealed that the hydrogen damage occurred in the specimen may be influential to the subsequent process of deformation and fracture.
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