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采用电化学循环伏安法于酸性环境中在MS X65管线钢表面“原位”快速生成腐蚀产物膜,利用改进的Davanathan-Stachurski双电池渗氢装置测量氢渗透曲线,研究H2S腐蚀产物膜对氢渗透动力学行为的影响规律。结果表明:无腐蚀产物膜时,相同p H值下,稳态渗氢电流(i∞)、氢表观扩散系数(Dapp)和阴极侧氢浓度(capp)均随H2S浓度([H2S])的增加而增加;相同H2S浓度下,i∞,Dapp和capp均随p H值的增加而减小。H2S腐蚀产物膜对氢渗透有一定的阻碍作用,且其阻碍作用大小随着腐蚀产物膜形貌、相态变化而变化。晶态Fe S和四方相硫铁矿两种相态共存的腐蚀产物膜对氢渗透行为的阻碍作用比非晶态的Fe S腐蚀产物膜大。
Electrochemical cyclic voltammetry was used to rapidly generate corrosion film on the surface of MS X65 pipeline steel in situ in acidic environment. The hydrogen permeation curve was measured with a modified Davanathan-Stachurski double cell hydrogen permeation apparatus to investigate the effect of H2S corrosion product film Effect on Hydrogen Permeation Dynamics. The results show that the steady-state hydrogen permeation current (i∞), hydrogen apparent diffusion coefficient (Dapp) and the cathode hydrogen concentration (capp) both decrease with the H2S concentration ([H2S] While the same H2S concentration, i∞, Dapp and capp decreased with the increase of p H value. The H2S corrosion product membrane has a certain hindering effect on the hydrogen permeation, and the size of the inhibition effect varies with the morphology and phase of the corrosion product membrane. The coexistence of the corrosion products of the crystalline FeS and tetragonal pyrite coexists with the hydrogen permeation behavior is more than the amorphous Fe S corrosion product film.