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通过U形试样应力腐蚀实验、电化学极化曲线等方法,在模拟催化裂化再生器环境条件下,研究了HNO3-H2SO4-H2O体系中16MnR钢及其焊缝的应力腐蚀行为。结果表明:16MnR钢焊接接头在不同实验条件下均比基材更易产生硝酸盐应力腐蚀开裂,其机理主要是阳极溶解;引入硫酸根和降低pH值均能破坏16MnR钢的保护膜,增大其焊接接头的应力腐蚀敏感性;当溶液的pH值降低至2以下时,材料处于活化状态,发生严重的均匀腐蚀。
The stress corrosion behavior of 16MnR steel and its weld in HNO3-H2SO4-H2O system was studied by stress corrosion test and electrochemical polarization curve of U-shaped specimen under simulated environmental conditions of FCC regenerator. The results show that the 16MnR steel welded joints are more prone to nitrate stress corrosion cracking than the substrate under different experimental conditions, and the mechanism is mainly anodic dissolution. The introduction of sulfate and reduction of pH value can destroy the protective film of 16MnR steel and increase its The stress corrosion sensitivity of the welded joints; when the pH of the solution drops below 2, the material is in an activated state and severe, uniform corrosion occurs.