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用高温高压反应釜模拟油气输送管道典型腐蚀环境,研究X65钢和3Cr钢作为海底管道用钢的抗CO2腐蚀性能。在温和腐蚀环境,X65钢与3Cr钢的平均腐蚀速率均较低,使用X65钢是安全的。随着温度和CO2分压提高,与X65钢相比3Cr钢表现出更优越的抗CO2腐蚀性能:在中等腐蚀环境3Cr钢平均腐蚀速率较X65钢大幅降低,在中等和苛刻腐蚀环境3Cr钢可有效抑制局部腐蚀的发生;在这样的腐蚀条件下,3Cr钢作为海底管道用钢较X65钢安全。3Cr钢较X65钢抗CO2腐蚀性能提高的主要原因是表面形成了富Cr的腐蚀产物膜,结构致密,对基体起到了有效的保护作用。
A typical high temperature and high pressure reactor was used to simulate the typical corrosive environment of oil and gas pipelines. The corrosion resistance of X65 steel and 3Cr steel as submarine pipeline steel was studied. In moderately corrosive environments, the average corrosion rates for both X65 and 3Cr steels are low, and the use of X65 steels is safe. 3Cr steel exhibits superior resistance to CO2 corrosion compared to X65 steel as the temperature and partial pressure of CO2 increase: the average corrosion rate of 3Cr steel in moderately corrosive environments is significantly lower than that of X65 steel, and 3Cr steels can be moderately and harshly corrosive Effectively suppress the occurrence of local corrosion; under such corrosion conditions, 3Cr steel as the safety of X65 steel for marine pipelines. The main reason for the improvement of CO2 corrosion resistance of 3Cr steel over X65 steel is the formation of Cr-rich corrosion products on the surface of the steel, which has a compact structure and has an effective protective effect on the substrate.