Subjects: Materials Science >> Materials Science (General) submitted time 2016-11-07 Cooperative journals: 《中国腐蚀与防护学报》
Abstract:通过浸泡实验考察了不同腐蚀时间下X80管线钢在库尔勒土壤模拟溶液中形成的腐蚀产物膜的变化规律,并通过扫描电镜和X-射线衍射仪观察和分析了腐蚀产物膜的形貌和组成;通过循环极化曲线和交流阻抗等方法,研究了腐蚀产物膜对X80管线钢点腐蚀行为的影响规律,分析了影响原因。实验结果表明:随着浸泡时间的延长,X80管线钢表面形成的腐蚀产物膜逐渐增厚,致密性逐渐提高。当腐蚀7天以后,腐蚀产物膜明显地分为了内外两层。表面存在的腐蚀产物膜可以阻碍或抑制X80管线钢的点蚀行为,这主要是因为表面腐蚀产物膜减少了蚀孔萌生的几率,增大了蚀孔长大的阻力。
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《中国腐蚀与防护学报》
Abstract: The evolution of corrosion product film formed on X80 pipeline steel in artificial solution, which simulate the soil medium at Ku'erle area, with different immersion time was studied by immersion tests, while the morphology and phase constituent of the corrosion product film was characterized by means of scanning electron microscope (SEM) and X-ray diffraction (XRD) respectively. The effect of corrosion product film on the pitting corrosion of X80 pipeline steel was investigated by cyclic polarization curves and electrochemical impedance spectroscopy (EIS). The experimental results showed that the thickness and compactness of corrosion product film gradually increased with increasing immersion time. After immersion for 168 h, the corrosion product film was clearly divided into two layers. The pitting of X80 pipeline steel may be hindered or inhibited by the corrosion product film, which may reduce the probability of pitting initiation, and increase the resistance to pitting growth.