摘要
自制实验装置,应用多种检测手段对挂片形貌、腐蚀速率以及挂片在线腐蚀情况进行分析,实验与数值仿真了多相流动状态下HCO_3^-对X70钢CO_2腐蚀速率的影响。结果表明:HCO_3^-浓度较低时,腐蚀介质中的H^+浓度升高,阴极析氢反应加快,X70钢腐蚀速度升高;HCO_3^-浓度较高时,碳酸根不溶盐优先附着在挂片表面,形成一层腐蚀产物膜,保护挂片。
The corrosion of X70 steel at plug flow using the homemade experimental apparatus was simulated. The effect of HCO_3^- on CO_2 corrosion of X70 steel was studied by analysing the bolt surface morphology,corrosion rate,and online coupon corrosion situation,the influence of HCO_3^- on the corrosion rate of X70 steel in the multiphase flow state was studied by experiment and numerical simulation,the results showed that： The H＋concentration increased in corrosive medium which brought that cathodic hydrogen evolution reaction was accelerated and the corrosion of X70 steel increased when the concentration of HCO_3^- was low. At high concentration of HCO_3^-,Such as,insoluble salt precipitation such as MgCO_3,CaCO_3,FeCO_3,perferentially attached on the surface of the bolt,and formed a layer of corrosion product film,which protected the coupon from corrosion.
出处
《环境工程》
CAS
CSCD
北大核心
2016年第1期150-154,共5页
Environmental Engineering
基金
国家自然科学基金项目(51006123)
