海底油气管道内CO_2腐蚀与防腐的研究

本工作采用2.4mV/s动态电位扫描极化、控制电位极化、电偶电流和高压釜挂片失重法研究了X60钢在含Ca^(2+)36.26mg/L,Mg^(2+)12.66mg/L和Cl^-3624mg/L的模拟氯化钠盐水中,CO_2引起腐蚀的电化学行为,以及含氮、硫的有机缓蚀剂和(或)Me^(2+)对腐蚀的抑制作用。结果表明:溶有CO_2的盐水腐蚀性强,盐浓度及温度会影响钢的腐蚀速度和阴极极化行为;75mg/L缓蚀剂的缓蚀率达90％,服从Langmuir吸附等温式;50mg/L缓蚀剂与127mg/LMe^(2+)复配,缓蚀率达91％以上,不服从Langmuir吸附等温式。

X_(60)钢在CO_2饱和盐水中缓蚀作用的研究

本文采用动电位极化、线性极化、电偶电流和高压釜挂片失重等法,研究了含氮、硫有机缓蚀剂和/或Me^(2+)对X60钢在CO_2饱和的盐水溶液中的缓蚀作用。结果表明,含氮、硫的有机缓蚀剂在缓蚀过程中,开始是以抑制阳极过程为主,随后是以抑制阴极过程为主的混合型缓蚀剂。如与Me^(2+)复配使用,能明显地提高缓蚀效能。

X60钢在CO_5饱和的盐水中极化行为影响因素的研充

笔者用动电位法研究了X60钢在CO_2饱和的盐水中极化行为的影响因素,研究结果表明:试样的阴、阳极极化率随试液盐浓度和温度的降低均有明显提高,且腐蚀速度减小;另外,发现阴极还原峰随着盐浓度PH值的降低、温度的升高由出现峰到峰的消失,又发现在试液中CO_2饱和状态下,可得到阴、阳极极化率低而腐蚀速度高的结果。文末还就外加无机盐金属离子等因素对上述结果的影响问题进行了讨论。

EFFECT OF Fe^(2+) IONS ON POLARIZATION BEHAVIOR OF X60 STEEL IN CO_2 SATURATED SALTY WATER

The effects of ferrous ions on cathodic and anodic polarization behavior of the X60 steel in CO2 saturated salty water were studied by potentio - dynamic polarization method. The results show that the reducing current peak of cathodic polarization is affected significantly if FeCl2 is added to the salty solution of controlled pH, but not the anodic polarization. It is considered that the ferrous ions accelerate the formation of a protective ferrous carbonate film . Films formed by addition of ferrous ions and those formed by ferrous ions produced from steel corrosion have the same forming mechanism . The former can fully meet the formative condition of the film and can play the role of inhibitor .