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采用高温高压釜实验研究了高硫高酸值原油温度对1Cr5Mo钢腐蚀速率的影响。利用扫描电镜和能谱技术观察并测试了腐蚀产物膜的微观形貌和产物膜的化学组成。利用电化学测试方法测试了带膜试样腐蚀电化学行为。结果表明,原油温度低于473 K时,1Cr5Mo钢主要腐蚀机理为环烷酸腐蚀,腐蚀速率增加缓慢;原油温度高于473 K时,1Cr5Mo钢主要腐蚀机理为环烷酸腐蚀、硫腐蚀,腐蚀速率迅速增加。当原油温度不大于513 K时,随原油温度增加,腐蚀产物膜渐趋完整,1Cr5Mo钢自腐蚀电流密度不断下降;当原油温度达到553 K时,产物膜变成疏松絮状结构,自腐蚀电流显著增加。
The effect of high sulfur and acid value crude oil temperature on the corrosion rate of 1Cr5Mo steel was studied with high temperature autoclave. The microstructure of the corrosion product film and the chemical composition of the product film were observed and measured by SEM and EDS. The electrochemical corrosion behavior of coated samples was tested by electrochemical test. The results show that the main corrosion mechanism of 1Cr5Mo steel is naphthenic acid corrosion and the corrosion rate increases slowly when the crude oil temperature is lower than 473 K. The main corrosion mechanism of 1Cr5Mo steel is naphthenic acid corrosion, sulfur corrosion and corrosion when the crude oil temperature is higher than 473 K The rate is increasing rapidly. When the temperature of crude oil is not more than 513 K, the corrosion product film becomes more and more complete with the increase of crude oil temperature, and the self-corrosion current density of 1Cr5Mo steel decreases continuously. When the crude oil temperature reaches 553 K, the product membrane becomes loose flocculent structure, A significant increase.