The effect of polyacrylamide on corrosion behavior of N80 steel in the HPAM/H₂S/CO₂ environment was studied by using weight‐loss and electrochemical tests to simulate the environment of production wells in polymer flooding. The morphology and composition of corrosion scales were studied by scanning electron microscopy, energy dispersive X‐ray spectrometer, and X‐ray photoelectron spectroscopy. The results show that as the polyacrylamide concentration increases, the uniform corrosion rate of N80 steel decreases gradually. The safe service life of N80 steel grows along with the increase of the concentration of polyacrylamide. The corrosion scales of N80 steel in the HPAM/H₂S/CO₂ environment is split into two layers, an inner layer of O‐rich composed of FeCO₃ and an outer layer of S‐rich consisting of FeS. Polyacrylamide adsorbs on the surface of N80 steel to form a protective network, which blocks contact between the metal and the solution and then inhibits the anodic dissolution of the metal. Moreover, the growth of polyacrylamide concentration increases the pH value of the solution and promotes the ionization of H₂S, HS⁻, and H₂CO₃ in the solution.

中文翻译：

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聚丙烯酰胺浓度对HPAM / H2S / CO2环境中N80钢腐蚀行为的影响

通过减重和电化学测试模拟聚合物驱中生产井的环境，研究了聚丙烯酰胺对N80钢在HPAM / H ₂ S / CO ₂环境中腐蚀行为的影响。通过扫描电子显微镜，能量色散X射线光谱仪和X射线光电子能谱研究了腐蚀垢的形态和组成。结果表明，随着聚丙烯酰胺浓度的增加，N80钢的均匀腐蚀速率逐渐降低。N80钢的安全使用寿命随着聚丙烯酰胺浓度的增加而增加。N80钢在HPAM / H ₂ S / CO _2中的腐蚀垢环境分为两层，一层由FeCO ₃组成的富含O的内层，一层由FeS组成的富含S的外层。聚丙烯酰胺吸附在N80钢的表面上，形成保护网络，该网络可阻止金属与溶液之间的接触，然后抑制金属的阳极溶解。此外，聚丙烯酰胺浓度的生长增加了溶液的pH值，并促进H的电离₂ S，HS ^- ，和H ₂ CO ₃溶液中。