CAJ | 학술논문

应用自制实验装置,模拟起伏管路段塞流动条件下 X70钢 CO 2腐蚀问题,通过电子显微镜、腐蚀挂片以及电化学在线监测等对挂片表面形貌、腐蚀速率以及挂片在线腐蚀情况进行分析,研究了多相流动状态下 CO 2分压对 X70钢 CO 2腐蚀速率的影响。结果表明,CO 2分压对 X70钢 CO 2腐蚀存在正反两方面的影响：随着 CO 2分压的增加,一方面腐蚀介质酸性增强,加快腐蚀；另一方面,CO 2-3的浓度升高,与 Mg2+、Ca2+、Fe2+等阳离子在腐蚀挂片表面形成了一层腐蚀产物膜,降低了腐蚀速度；CO 2分压对 X70钢 CO 2腐蚀的影响与温度息息相关,随着温度的升高,腐蚀速率达到最高值的 CO 2分压越来越低,CO 2分压对 X70钢基体的保护作用大过腐蚀作用的 CO 2分压越来越低。
응용자제실험장치,모의기복관로단새류동조건하 X70강 CO 2부식문제,통과전자현미경、부식괘편이급전화학재선감측등대괘편표면형모、부식속솔이급괘편재선부식정황진행분석,연구료다상류동상태하 CO 2분압대 X70강 CO 2부식속솔적영향。결과표명,CO 2분압대 X70강 CO 2부식존재정반량방면적영향：수착 CO 2분압적증가,일방면부식개질산성증강,가쾌부식；령일방면,CO 2-3적농도승고,여 Mg2+、Ca2+、Fe2+등양리자재부식괘편표면형성료일층부식산물막,강저료부식속도；CO 2분압대 X70강 CO 2부식적영향여온도식식상관,수착온도적승고,부식속솔체도최고치적 CO 2분압월래월저,CO 2분압대 X70강기체적보호작용대과부식작용적 CO 2분압월래월저。
The corrosion of X70 steel was simulated at plug flow using the homemade experimental apparatus.The effect of CO 2 partial pressure on CO 2 corrosion of X70 steel was studied by analysis of the bolt surface morphology,corrosion rate,and online coupon corrosion situation using electronic microscope,bolt and electrochemical corrosion online monitoring.The results showed there was two effect of the pros and cons on of CO 2 partial pressure on CO 2 corrosion of X70 steel.On the one hand, enhances of corrosive medium acidity accelerated the corrosion rate,on the other hand,CO 2-3 combined with Mg2+ ,Ca2+ and Fe2+ and a layer of corrosion product film was formed which reduced the corrosion rate when concentration of CO 2-3 increased. The effect of CO 2 partial pressure on CO 2 corrosion of X70 steel was closely related to the temperature.The CO 2 partial pressure reduced when the corrosion rate achieved the highest point and protection role was greater than corrosion role for X70 steel substrate with the increasing of temperature.