摘要
采用动电位极化、电化学阻抗谱(EIS)和80℃水溶液动态浸泡试验研究了Incoloy825合金在不同F^(-)浓度的酸性高氯介质中的腐蚀行为。结果表明:Incoloy825合金在酸性高氯介质中的腐蚀行为受F^(-)浓度的影响,随着F^(-)浓度由0.1 g/L增至0.3 g/L,Incoloy825在酸性高氯介质中的腐蚀倾向减小、腐蚀速率降低。在含F^(-)的酸性高氯介质中,Incoloy825合金表面的钝化膜稳定且致密,仍保持较好的耐腐蚀性能。Incoloy825合金在80℃的含F^(-)酸性高氯介质中浸泡840 h后,其表面少数区域发生了点蚀,部分蚀坑的直径超过20μm,点蚀深度超过10μm。随着F^(-)浓度在0.1~0.3 g/L范围内升高,Incoloy825表面的蚀坑直径有所增大,平均点蚀深度有所增加。
The corrosion behavior of Incoloy825 alloy in acidic high chloride solution with different F-concentrations were studied by potentiodynamic polarization,electrochemical impedance spectroscopy(EIS)and dynamic immersion experiments at 80℃.The results show that the corrosion behavior of Incoloy825 alloy in acidic high chloride solution was affected by the F-concentration.As the F-concentration increased from 0.1 g/L to 0.3 g/L,the corrosion tendency and corrosion rate of Incoloy825 decreased in acidic high chloride solution.In the acidic high chloride solution containing F-,the passivation film on the surface of Incoloy825 alloy was stable and dense,and still maintained good corrosion resistance.After the Incoloy825 alloy was immersed in the acidic high chloride solution containing F-at 80℃for 840 h,pitting corrosion occurred in a few areas.The diameter of some corrosion pits was more than 20μm and the depth was more than 10μm.With the increase of Fconcentration in the range of 0.1~0.3 g/L,the pits diameter and the average pits depth on the surface of Incoloy825 increased.
作者
杨淑莉
李富天
邓毅
谢逍原
李玉
张帮彦
刘光明
YANG Shuli;LI Futian;DENG Yi;XIE Xiaoyuan;LI Yu;ZHANG Bangyan;LIU Guangming(Dongfang Boiler Group Co.,Ltd.,Zigong 643001,Sichuan,China;Nanchang Hangkong University,Nanchang 330063,China)
出处
《焊管》
2023年第10期8-13,共6页
Welded Pipe and Tube
基金
国家自然科学基金项目“高温水蒸汽与应力耦合下TP439不锈钢的氧化行为及失效判据研究”(项目编号51961028)。
