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采用扫描电镜、原子力显微镜和表而粗糙度测量仪对具有不同表面状态的690TT合金表面形貌进行了表征与比较。采用零电荷电位测量、动电位扫描和电化学快慢扫描等方法对不同的690TT合金的腐蚀行为进行了比较。结果表明,与机械抛光样品相比较,打磨样品表面起伏较严重,拥有更大的表面粗糙度值;在相同的腐蚀环境中,打磨样品比机械抛光样品表现出更大的腐蚀速度和更高的应力腐蚀开裂敏感性。分析认为,单纯的表面较大粗糙度和残余应变均能够促进690TT合金的腐蚀。实验中打磨690TT样品表现出的较高腐蚀速度和应力腐蚀开裂敏感性是由其较大的表面粗糙度和表面残余应变综合影响结果。
The surface morphology of 690TT alloy with different surface states was characterized and compared by scanning electron microscopy, atomic force microscopy and surface roughness measuring instrument. The corrosion behaviors of different 690TT alloys were compared using zero charge potential measurement, potentiodynamic scanning and electrochemical slow scanning. The results show that, compared with the mechanically polished samples, sanding samples have more severe surface fluctuations and larger surface roughness values; in the same corrosive environment, sanding samples show greater corrosion rate and higher Stress corrosion cracking sensitivity. The analysis shows that the simple surface roughness and residual strain can promote the corrosion of 690TT alloy. The higher corrosion rate and stress corrosion cracking susceptibility exhibited by the 690TT samples polished in the experiment were mainly due to the combination of larger surface roughness and surface residual strain.