CAJ | 학술논문

通过恒电位阳极极化和失重法考察了不同pH、温度和H2S浓度下Q235A钢在弱酸性介质中的氢渗透电流密度与腐蚀速率的变化情况，着重探讨了各影响因素下氢渗透电流与失重腐蚀速率之间的相关性，为氢通量技术用于油气管道非侵入式腐蚀监测提供依据。研究发现：随着pH降低或介质温度升高，Q235A钢的腐蚀速率与氢渗透电流均逐步增大，且二者之间具有良好的线性相关性。随着H2S浓度增加，Q235A钢的腐蚀速率呈现先增大后降低的趋势，但氢渗透电流则先增大而后趋于稳定；当H2S浓度在5～200 mg·L-1范围内，腐蚀速率与氢电流符合二阶多项式函数关系。通过自制的氢通量探针监测实验管道内腐蚀时，发现过厚的管壁降低了氢电流测量灵敏度，但采用恒电位阶跃法得到的氢渗透电量（氢通量）则与失重腐蚀速率之间具有良好相关性，表明渗氢电量法可用于测量油气管道的内腐蚀速率。
통과항전위양겁겁화화실중법고찰료불동pH、온도화H2S농도하Q235A강재약산성개질중적경삼투전류밀도여부식속솔적변화정황，착중탐토료각영향인소하경삼투전류여실중부식속솔지간적상관성，위경통량기술용우유기관도비침입식부식감측제공의거。연구발현：수착pH강저혹개질온도승고，Q235A강적부식속솔여경삼투전류균축보증대，차이자지간구유량호적선성상관성。수착H2S농도증가，Q235A강적부식속솔정현선증대후강저적추세，단경삼투전류칙선증대이후추우은정；당H2S농도재5～200 mg·L-1범위내，부식속솔여경전류부합이계다항식함수관계。통과자제적경통량탐침감측실험관도내부식시，발현과후적관벽강저료경전류측량령민도，단채용항전위계약법득도적경삼투전량（경통량）칙여실중부식속솔지간구유량호상관성，표명삼경전량법가용우측량유기관도적내부식속솔。
The effects of pH, temperature and H2S concentration on hydrogen permeation current and corrosion rate of Q235A carbon steel in weakly acidic medium were studied with the potentiostatic anodic polarization and mass loss methods. The relationship between hydrogen permeation current density and corrosion rate was investigated, aiming at using the hydrogen flux method in online non-intrusive corrosion monitoring of oil pipelines. Increasing acidity and temperature could boost hydrogen permeation current and corrosion rate of Q235A steel in the corrosive solutions, with a good linear relationship between them. The corrosion rate of Q235A steel increased initially and then decreased slightly with increasing concentration of H2S. Meanwhile, hydrogen permeation current also increased at first and then stabilized. When the concentration of H2S was 5-200 mg·L-1, there was a quadratic function between corrosion rate and hydrogen permeation current. Based on inner corrosion monitoring of an experimental pipe by a self-made hydrogenermeation flux probe, the thick pipe wall could decrease the sensitivity of hydrogen permeation current. However, by the help of step potentiostatic polarization, hydrogen permeation flux was found to be linearly related to the corrosion rate of Q235A steel measured by mass loss, indicating that the hydrogen permeation flux could be applicable for the non-intrusive inner corrosion monitoring of thick oil pipelines.