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中国腐蚀与防护学报
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304L在硝酸-硝酸钠环境下的腐蚀研究
刘希武1,赵小燕1,崔新安1,段永锋1,2,李晓炜1,程荣奇1
1. 中石化炼化工程(集团)股份有限公司洛阳技术研发中心
2. 中国石油化工集团石油化工设备防腐蚀研究中心
The effect of sodium nitrate on the corrosion behavior of 304L in nitric acid-sodium nitrate solution was verified by means of coupon immersion test and potentiodynamic polarization curve measurement combined with micro corrosion morphology analysis. On this basis, the effects of the sodium nitrate concentration and temperature was also studied. The result showed that the corrosion of 304L in sodium nitrate solution was very slight, and the weightlessness was not detected. However, the presence of sodium nitrate induced or exacerbated the intergranular corrosion of 304L in nitric acid-sodium nitrate solution. The corrosion of 304L in the solution and the steam was more severe with the increase of sodium nitrate concentration or the increase of temperature. The material in the steam was first to suffer intergranular corrosion, and even the falling off of grain occurred. The increase of temperature can enhance the promoting effect of sodium nitrate on corrosion.
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摘要: 采用腐蚀挂片和动电位极化曲线测量两种实验方法并结合微观腐蚀形貌分析,验证了硝酸钠的存在对304L在硝酸-硝酸钠水溶液环境下腐蚀行为的影响,并在此基础上探讨了硝酸钠浓度和温度对腐蚀的影响。结果表明,304L在硝酸钠水溶液环境下腐蚀极轻微,未检测到失重,但是在硝酸-硝酸钠水溶液环境下,硝酸钠的存在诱发或加剧了304L的晶间腐蚀;304L在水溶液和蒸汽中的腐蚀均随硝酸钠浓度的增大或温度的升高而加剧,材料在蒸汽中优先发生晶间腐蚀,甚至出现晶粒脱落。温度升高可增强硝酸钠对腐蚀的促进作用。
Abstract:The effect of sodium nitrate on the corrosion behavior of 304L in nitric acid-sodium nitrate solution was verified by means of coupon immersion test and potentiodynamic polarization curve measurement combined with micro corrosion morphology analysis. On this basis, the effects of the sodium nitrate concentration and temperature was also studied. The result showed that the corrosion of 304L in sodium nitrate solution was very slight, and the weightlessness was not detected. However, the presence of sodium nitrate induced or exacerbated the intergranular corrosion of 304L in nitric acid-sodium nitrate solution. The corrosion of 304L in the solution and the steam was more severe with the increase of sodium nitrate concentration or the increase of temperature. The material in the steam was first to suffer intergranular corrosion, and even the falling off of grain occurred. The increase of temperature can enhance the promoting effect of sodium nitrate on corrosion.
收稿日期: 2017-11-22     
基金资助:中石化科研项目
通讯作者: 崔新安   

引用本文:

刘希武 赵小燕 崔新安 段永锋 李晓炜 程荣奇. 304L在硝酸-硝酸钠环境下的腐蚀研究[J]. 中国腐蚀与防护学报, .

链接本文:

https://www.jcscp.org/CN/Y0/V/I/0

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