目的：研究变形量对690合金电化学行为的影响。方法采用动电位极化、电化学阻抗和高温高压浸泡实验,结合扫描电子显微镜( SEM)、X射线光谱仪( EDX)和X射线光电子能谱( XPS),研究不同变形量的690合金传热管在核电模拟液中的腐蚀行为。结果在常温常压下,50％变形量试样的自腐蚀电位比25％变形量试样正140 mV,维钝电流密度显著降低,阻抗模值高出约10倍。高温高压下浸泡后, XPS分析显示,50％变形量试样表面腐蚀产物膜中的Cr2 O3含量远高于25％变形量试样,其富Cr内层致密,氧化层更厚。结论50％变形量的690合金表面形成的钝化膜及腐蚀产物膜对基体的保护作用更强。
ABSTRACT:Objective To study the effect of rolling deformation on the electrochemical behavior of 690 Alloy. Methods Poten-tiodynamic polarization, electrochemical impedance spectroscopy ( EIS) and high temperature and pressure immersion tests, com-bined with scanning electron microscopy ( SEM) , X-ray spectroscopy ( EDX) and X-ray photoelectron spectroscopy ( XPS) tech-niques, were used to investigate the corrosion behavior of 690 alloy heat transfer tubes with different degrees of deformation in the nuclear simulation solution. Results Under the atmospheric pressure, the corrosion potential of 690 alloy with 50% deformation was
140 mV larger than that of 690 alloy with 25% deformation. Furthermore, the passive current density of the former was significantly declined and the impedance modulus was 10 times higher. After soaking at high temperature and high pressure, XPS results showed that when the experiential materials were immersed for 200 h, 690 alloy with 50% deformation had a higher Cr2 O3 content in the corrosion product film than 690 alloy with 25% deformation, and its dense inner layer of Cr-rich oxide film was much thicker. Conclusion The passivation film and corrosion products layer formed on the surface of alloy 690 with 50% deformation had a better protective effect on the substrate.
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