利用自制压力釜，通过失重法，分别研究了静态及动态条件 下不同原油/水介质含量(体积)比对油管钢在CO2饱和的模拟油田液中的腐蚀影响，并通过 环境扫描电镜、能谱、X-ray衍射及X射线光电子能谱对腐蚀产物膜的形貌、结构及组成进行 了分析.结果表明：原油/水介质含量比对阴极析氢反应有显著影响，与CO2腐蚀速率的关 系是：动态条件下，水介质含量为70%时，腐蚀速率出现波谷；动、静两种条件下，水介质 含量为50%时，腐蚀速率各自出现一个波峰.腐蚀产物膜中含有复盐(Mn,Fe)CO3、(Ca,Mn )CO3及(Ca,Mn,Fe)CO3，腐蚀产物为FeCO3，在空气中不稳定，发生分解，最终生成Fe 2O3.
Using a self-made autoclave for corrosion test,the effect of crude oil/water ratio(volume) on the corrosion of oil tubes in CO2 s aturated crude oil/water mixtures is studied by weight-loss method under static and turbulent conditions.Furthermore,the morphology,microstructure and ingredien ts of the scales are investigated using environmental scanning electron microsco pe (ESEM),spectrum (EDS),X-ray diffraction (XRD) and X-ray photoelectron spectro scopy(XPS).Experimental results show that the crude oil/water ratio has a great effect on the cathodic reactions.The relation between water cut and corrosion ra tes is that corrosion rates occur a trough with 70% water under turbulent flow a s well as N80 and J55 under static condition.However,corrosion rates occur a pea k value under both flowing and static conditions with 50% water.Meanwhile,the ex amination reveals that the scale is composed of the complex salts:(Ca,Mn)CO3, (Mn,Fe)CO3 and (Ca,Mn,Fe)CO3 and that FeCO3,the corrosion product is unsta ble and decomposes into Fe2O3 in air.
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