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本文采用电化学氢气渗透测试,测量了H2在电解液中渗透通过X-65号钢管的电流,该电解液模拟了发生近中性pH值应力腐蚀断裂的土壤环境。根据固定浓度模型分析氢气渗透电流。试验表明,模拟土壤中有机物的AQDS会通过降低亚表面氢气浓度来抑制H原子的渗透,而硫化物却通过抑制H原子的复合促进了氢气的渗透,如此一来增加了亚表面氢气浓度。在具有较高的亚表面氢气浓度的土壤中,钢样品对应力腐蚀断裂更为灵敏,这表明氢气与管路中的近中性pH值应力腐蚀断裂有关。有人认为氢气加速了钢的断裂,并伴随着阳极在断裂侧和断裂末端的分解。
In this paper, the electrochemical hydrogen permeation test was used to measure the current of H2 permeating through the X-65 steel tube in the electrolyte. The electrolyte simulates the soil environment under near neutral pH stress corrosion cracking. Hydrogen permeation current was analyzed according to a fixed concentration model. Experiments show that AQDS, which simulates organic matter in soils, suppresses the infiltration of H atoms by reducing the subsurface hydrogen concentration, whereas sulfides increase the penetration of hydrogen by inhibiting the recombination of H atoms, thus increasing the subsurface hydrogen concentration. In soils with higher subsurface hydrogen concentrations, the steel samples are more sensitive to stress corrosion cracking, suggesting that hydrogen is associated with near-neutral pH stress corrosion cracking in the pipeline. It is believed that hydrogen accelerates the fracture of the steel with the decomposition of the anode on the fracture side and the fracture tip.