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首页> 外文期刊>International journal of hydrogen energy >Analysis of electrochemical hydrogen permeation through X-65 pipeline steel and its implications on pipeline stress corrosion cracking
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Analysis of electrochemical hydrogen permeation through X-65 pipeline steel and its implications on pipeline stress corrosion cracking

机译：X-65管线钢的电化学氢渗透分析及其对管线应力腐蚀开裂的影响

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Electrochemical hydrogen permeation tests were performed to measure the hydrogen permeation current through the X-65 pipeline steel in the electrolytes simulating the soil conditions to initiate near-neutral pH stress corrosion cracking (SCC) in pipelines. The hydrogen permeation current was analyzed following the constant concentration model. It is shown that, AQDS, simulating the organic compound in the soil, inhibits hydrogen permeation by decreasing the sub-surface hydrogen concentration, while sulfide promotes hydrogen permeation by inhibiting the hydrogen recombination and thus increasing the sub-surface hydrogen concentration. The steel specimen is more susceptible to stress corrosion cracking in the soil solution with a higher sub-surface hydrogen concentration, indicating that hydrogen is involved in near-neutral pH SCC in pipelines. It is suggested that hydrogen promotes the cracking of the steel, accompanying with the anodic dissolution on the crack sides and at the crack tip.
机译：进行了电化学氢渗透测试，以测量流经电解质的X-65管线钢中的氢渗透电流，从而模拟土壤条件，以启动管道中的近中性pH应力腐蚀开裂（SCC）。按照恒定浓度模型分析氢渗透电流。结果表明，AQDS模拟土壤中的有机化合物，通过降低地下氢的浓度来抑制氢的渗透，而硫化物则通过抑制氢的重组并因此增加地下氢的浓度来促进氢的渗透。该钢试样在土壤溶液中具有较高的地下氢浓度时更容易受到应力腐蚀开裂的影响，这表明氢参与了管道中接近中性的pH SCC。有人认为，氢会促进钢的开裂，同时​​在裂纹的侧面和裂纹尖端也会产生阳极溶解。

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