周鑫强,陈朝轶,付慧,陈侣,杨彬,龙玉斌.铝酸钠溶液中S2-浓度对20Cr钢腐蚀行为的影响[J].表面技术,2019,48(12):264-270.
ZHOU Xin-qiang,CHEN Chao-yi,FU Hui,CHEN Lyu,YANG Bin,LONG Yu-bin.Effect of S2- Concentration on Corrosion Behavior of 20Cr Steel in Sodium Aluminate Solution[J].Surface Technology,2019,48(12):264-270 |
| 铝酸钠溶液中S2-浓度对20Cr钢腐蚀行为的影响 |
| Effect of S2- Concentration on Corrosion Behavior of 20Cr Steel in Sodium Aluminate Solution |
| 投稿时间：2019-03-23 修订日期：2019-12-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2019.12.032 |
| 中文关键词: 20Cr钢 S2-浓度 铝酸钠溶液 高温浸泡腐蚀 电化学 |
| 英文关键词:20Cr steel S2- concentration sodium aluminate solution electrochemistry high temperature immersion corrosion |
| 基金项目:国家自然科学基金（51574095，517741022，51664005）；贵州省教育厅项目（黔教合KY（2015）334）；黔科合平台人才（[2017]5626、[2017]5788）；贵大SRT字（2017）012 |
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| Author | Institution |
| ZHOU Xin-qiang | 1.School of Materials and Metallurgy, Guizhou University, Guiyang 550025, China; 2.Key Laboratory of Metallurgical Engineering and Process Energy Conservation of Guizhou Province, Guiyang 550025, China |
| CHEN Chao-yi | 1.School of Materials and Metallurgy, Guizhou University, Guiyang 550025, China; 2.Key Laboratory of Metallurgical Engineering and Process Energy Conservation of Guizhou Province, Guiyang 550025, China |
| FU Hui | 1.School of Materials and Metallurgy, Guizhou University, Guiyang 550025, China; 2.Key Laboratory of Metallurgical Engineering and Process Energy Conservation of Guizhou Province, Guiyang 550025, China |
| CHEN Lyu | 1.School of Materials and Metallurgy, Guizhou University, Guiyang 550025, China; 2.Key Laboratory of Metallurgical Engineering and Process Energy Conservation of Guizhou Province, Guiyang 550025, China |
| YANG Bin | 1.School of Materials and Metallurgy, Guizhou University, Guiyang 550025, China; 2.Key Laboratory of Metallurgical Engineering and Process Energy Conservation of Guizhou Province, Guiyang 550025, China |
| LONG Yu-bin | 1.School of Materials and Metallurgy, Guizhou University, Guiyang 550025, China; 2.Key Laboratory of Metallurgical Engineering and Process Energy Conservation of Guizhou Province, Guiyang 550025, China |
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| 中文摘要: |
| 目的 研究20Cr钢在铝酸钠溶液中不同S2-浓度下的腐蚀行为及产物形成过程，探索腐蚀机理。方法 20Cr钢在不同S2-浓度的溶液中进行高温浸泡腐蚀实验与电化学测试，结合扫描电子显微镜（SEM）、X射线能谱仪（EDS）、X射线衍射仪（XRD）等分析技术，观察腐蚀产物的微观形貌、元素含量与组成。运用失重法、极化曲线和交流阻抗图分析样品的腐蚀速率。结果 S2-质量浓度从0 g/L增加到5 g/L时，腐蚀速率由3.43 g/(m2•d)上升到25.20 g/(m2•d)，腐蚀产物逐渐增多，S2-质量浓度在6 g/L时，腐蚀速率下降到21.30 g/(m2•d)。EDS结果表明，随S2-浓度的增加，腐蚀产物中铬元素含量增加，铁元素总体含量降低，氧、铝元素含量呈现先增长后降低趋势。XRD结果显示，加入S2-与未加S2-相比，腐蚀产物物相组成由Fe3O4和FeOOH变为Fe3O4、FeCr2O4和FeS。电化学测试得到S2-质量浓度从0 g/L到5 g/L时，腐蚀电流密度由22.87 mA/cm2上升到586.02 mA/cm2，S2-质量浓度在6 g/L时，电流密度下降到183.06 mA/cm2。结论 S2-质量浓度在0~5 g/L范围时，20Cr钢的腐蚀速率逐渐增加，腐蚀产物中形成FeS，S2-的加入能够促进腐蚀反应，破坏未加入硫元素时形成的较致密腐蚀物；当S2-质量浓度超过5 g/L后，形成致密的FeCr2O4尖晶石氧化物，粘附在试样表面，对腐蚀起到抑制作用。 |
| 英文摘要: |
| The work aims to explore the corrosion mechanism and corrosion process of 20Cr steel in different sodium aluminate solutions with different S2- concentrations. 20Cr steel was subjected to high temperature immersion corrosion test and electrochemical test in different S2- concentration solutions. Combined with scanning electron microscope (SEM), X-ray energy disperse spectroscopy (EDS), X-ray diffraction (XRD) and other analytical techniques, the microstructure, element content and composition of corrosion products were observed. The corrosion rate of the sample was analyzed by weight loss method, polarization curve and AC impedance map. With the concentration of S2- from 0 g/L to 5 g/L, the corrosion rate increased from 3.43 g/(m2×d) to 25.20 g/(m2×d), and the corrosion product increased gradually. The corrosion rate decreased to 21.30 g/(m2×d) when the concentration of S2- was 6 g/L. The results of EDS showed that with the increase of S2- concentration, the content of chromium in corrosion products increased, the total content of iron decreased, and the content of oxygen and aluminum increased first and then decreased. XRD results showed that the phase composition of the corrosion product changed from Fe3O4 and FeOOH to Fe3O4, FeCr2O4 and FeS after S2- was added. Electrochemical tests showed that when the S2- concentration ranged from 0 g/L to 5 g/L, the corrosion current density increased from 22.87 mA/cm2 to 586.02 mA/cm2, and when the S2- concentration was 6 g/L, the current density decreased to 183.06 mA/cm2. When the concentration of S2- is in the range of 0~ 5 g/L, the corrosion rate of 20Cr steel increases gradually, and FeS is formed in the corrosion product. The addition of S2- can promote the corrosion reaction and destroy the dense corrosive formed when no sulfur element is added. After the S2- concentration exceeds 5 g/L, a dense FeCr2O4 spinel oxide is formed, which adheres to the surface of the sample and inhibits corrosion. |
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