摘要
通过腐蚀失重法、线性电位扫描法以及场发射扫描电镜(FE-SEM)和X-射线衍射(XRD)等表面分析技术对酸性环境用X52 MS管线钢在H2S饱和的5%NaCl溶液中所形成的腐蚀产物膜的形貌、结构特征及物相组成进行了观察和分析。结果表明,在本试验条件下,腐蚀产物膜的主要成分由非晶态FeS逐步转变为四方相硫铁矿(mackinawite)FeS,且随着时间的延长,腐蚀产物膜厚度逐渐增加,结构也越来越致密;无论是平均腐蚀失重速率还是瞬时腐蚀电流密度Jcorr均随着时间的延长而降低,相对致密的mackinawite腐蚀产物膜对试样有一定的保护性,对X52MS管线钢的均匀腐蚀能够起到一定的抑制作用。
The morphology,structure and composition of the corrosion product films on X52 MS pipeline steel in5% NaCl solution with saturated H2 S were investigated by weight loss method,surface analysis techniques such as field emission scanning electron microscopy(SEM)and X-ray Diffraction(XRD),electrochemical techniques such as linear potential sweep and electrochemical impedance spectroscopy.The results showed that,in the experimental conditions,the main composition of the corrosion product films was mackinawite FeS,and with the increase of time,the thickness of the corrosion product films increased gradually,and the structure became dense.In addition,not only the average corrosion rates of weight loss,but also the instant current density both reduced with the time increased.The relatively dense corrosion product films had some protection properties,which could inhibit the general corrosion of X52 MS pipeline steel.
出处
《腐蚀与防护》
CAS
北大核心
2015年第10期918-922 928,928,共6页
Corrosion & Protection
基金
国家自然科学基金项目(51201119)
关键词
X52
MS管线钢
湿H2S环境
腐蚀产物膜
X52 MS pipeline steel
wet hydrogen sulfide environment
corrosion product film
