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通过高温高压鲜酸(10%HCl+1.5%HF+3%HAc+5.1%TG201缓蚀剂)、残酸、地层水CO2腐蚀实验及电化学分析,研究TP140钢在苛刻工况条件下的耐蚀性。结果表明:TP140钢在鲜酸、残酸和地层水CO2腐蚀实验条件下,其均匀腐蚀速率分别为3.7490,0.4361和0.5524 mm/a。残酸实验后,试样表面存在不完整Cu膜。未去除Cu膜的TP140钢试样的自腐蚀电位(-658 m V)高于去除Cu膜的TP140钢试样的(-692 m V),腐蚀驱动力小,但其自腐蚀电流密度(3.1141×10-5A/cm2)明显高于去除Cu膜的(1.0926×10-5A/cm2)。相比于TP140钢基体(Fe),Cu为正电性金属,膜的覆盖不致密形成典型的大阴极-小阳极结构,导致严重的局部腐蚀。TP140钢在鲜酸、残酸和地层水CO2腐蚀实验条件下,试样表面最大点蚀深度可达150μm。
The corrosion resistance of TP140 steel under harsh working conditions was studied by high temperature and pressure acidification (10% HCl + 1.5% HF + 3% HAc + 5.1% TG201 inhibitor), residual acid and formation water CO2 corrosion test and electrochemical analysis Erosive. The results show that the average corrosion rates of TP140 steel are 3.7490, 0.4361 and 0.5524 mm / a respectively under the experimental conditions of fresh acid, residual acid and formation water CO2 corrosion. After acid test, there is incomplete Cu film on the sample surface. The corrosion resistance (-658 mV) of TP140 steel without Cu film was higher than that of TP140 steel with Cu film (-692 mV), and the corrosion driving force was small. However, the self-corrosion current density (3.1141 × 10 -5 A / cm 2) was significantly higher than that of the Cu film (1.0926 × 10 -5 A / cm 2). Compared with TP140 steel matrix (Fe), Cu is a positive metal, the film is not densely formed to form a typical large cathode - small anode structure, leading to serious localized corrosion. TP140 steel in fresh acid, residual acid and formation water CO2 corrosion experimental conditions, the maximum pitting depth of the sample surface up to 150μm.