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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
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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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