针对普通Cr13钢的CO2腐蚀性能,模拟大庆油田井下的腐蚀环境,通过高温高压釜进行了Cr13钢的腐蚀试验.采用SEM、EDS和XPS测试手段分析研究所获得CO2腐蚀产物膜的形貌和化学组成.结果表明,在所试验的三个温度下,Cr13钢液相、气相的腐蚀类型主要为均匀腐蚀.Cr13钢的腐蚀膜主要成分是晶态FeCO3和非晶态的Cr(OH)3.在85 ℃和110 ℃下,Cr13钢液相腐蚀速率为中度腐蚀,基体表面形成了一层深褐色腐蚀膜层且表面平整均匀,晶粒细小,膜层较薄；在170 ℃下其腐蚀速率靠近严重腐蚀的下限,接近中度腐蚀的上限；气相腐蚀与液相腐蚀腐蚀过程相似,属于中度腐蚀.腐蚀产物膜表面为较大颗粒的晶粒,很不规则.

The carbon dioxide corrosion experiments of ordinary Cr13 steel at high temperature and high pressure were performed in the simulated environment of Daqing oil field.The morphology and chemical composition of corrosion product films were analyzed by means of SEM,EDS and XPS.At three experimental temperatures,corrosion modes of Cr13 steel in liquid and gas phases were all uniform corrosion.The major components of the corrosion films were qualitatively FeCO3 and amorphous compound Cr(OH)3.At the temperatures of 85 ℃ and 110 ℃,the corrosion rate of Cr13 steel in liquid phase was moderate.A puce and thin film was formed on the surface.The film with fine grains was flat and uniform.The corrosion rate adjoined to the lower limit of serious corrosion and upper limit of moderate corrosion at 170 ℃.The processes of corrosion in liquid and gas phases were similar,and belonged to moderate corrosion.The grains of the corrosion products were big and anomalistic.