付慧,陈朝轶,李军旗,兰苑培,张湘黔,苑京久.含硫代硫酸根铝酸钠溶液中时间对Q345钢腐蚀的影响[J].表面技术,2018,47(11):166-172.
FU Hui,CHEN Chao-yi,LI Jun-qi,LAN Yuan-pei,ZHANG Xiang-qian,YUAN Jing-jiu.Effect of Time on the Corrosion of Q345 Steel in Thiosulfate Sodium Aluminate Solution[J].Surface Technology,2018,47(11):166-172 |
| 含硫代硫酸根铝酸钠溶液中时间对Q345钢腐蚀的影响 |
| Effect of Time on the Corrosion of Q345 Steel in Thiosulfate Sodium Aluminate Solution |
| 投稿时间：2018-07-30 修订日期：2018-11-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2018.11.024 |
| 中文关键词: 盐雾腐蚀 电化学腐蚀 腐蚀时间 硫代硫酸钠 Q345钢 |
| 英文关键词:salt spray corrosion electrochemical corrosion corrosion time sodium thiosulfate Q345 steel |
| 基金项目:国家自然科学基金（51574095，51474079，51774102）；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） |
|
|
| Author | Institution |
| FU Hui | 1.School of Material and Metallurgy, Guizhou University, Guiyang 550025, China; 2.Key Laboratory of Metallurgical Engineering and Process Energy Saving of Guizhou Province, Guiyang 550025, China |
| CHEN Chao-yi | 1.School of Material and Metallurgy, Guizhou University, Guiyang 550025, China; 2.Key Laboratory of Metallurgical Engineering and Process Energy Saving of Guizhou Province, Guiyang 550025, China |
| LI Jun-qi | 1.School of Material and Metallurgy, Guizhou University, Guiyang 550025, China; 2.Key Laboratory of Metallurgical Engineering and Process Energy Saving of Guizhou Province, Guiyang 550025, China |
| LAN Yuan-pei | 1.School of Material and Metallurgy, Guizhou University, Guiyang 550025, China; 2.Key Laboratory of Metallurgical Engineering and Process Energy Saving of Guizhou Province, Guiyang 550025, China |
| ZHANG Xiang-qian | 1.School of Material and Metallurgy, Guizhou University, Guiyang 550025, China; 2.Key Laboratory of Metallurgical Engineering and Process Energy Saving of Guizhou Province, Guiyang 550025, China |
| YUAN Jing-jiu | 1.School of Material and Metallurgy, Guizhou University, Guiyang 550025, China; 2.Key Laboratory of Metallurgical Engineering and Process Energy Saving of Guizhou Province, Guiyang 550025, China |
|
| 摘要点击次数: |
| 全文下载次数: |
| 中文摘要: |
| 目的 在含4 g/L S2O32?的铝酸钠溶液中，研究腐蚀时间对Q345钢腐蚀行为的影响，探索腐蚀规律，明确腐蚀机理。方法 采用盐雾腐蚀和电化学腐蚀实验，通过腐蚀失重法、极化曲线、阻抗谱、SEM、EDS等手段，研究Q345钢的腐蚀行为。结果 当腐蚀时间从3 d延长至7 d时，腐蚀失重从2.4505 g/m2增大至2.6420 g/m2，点蚀深度从3.3 μm升高至4.6 μm，超过7 d以后，趋于稳定。腐蚀速率方程为V =2.426t?0.975，1~3 d范围内，腐蚀速率急剧下降。初期腐蚀电流密度较大，由3 d增至5 d时，腐蚀电流密度由6.538 μA/cm2迅速降低至0.785 μA/cm2，之后逐渐降低至0.308 μA/cm2（9 d），容抗半径和电荷转移电阻Rct均随腐蚀时间的增加而增加。腐蚀时间延长，产物中O、Al、S等元素的含量增加，Fe元素含量降低。结论 腐蚀初期，OH?优先吸附，生成较致密的Fe3O4与FeOOH；腐蚀中期，S2O32?与基体反应形成粘附力弱的FeS，使得Fe3O4结构不稳定而脱落，产物结构疏松；腐蚀后期，Al(OH)3转变为Al2O3，AlO2?与Fe3O4形成尖晶石FeAl2O4，结构较为致密，覆盖基体表面，阻碍了腐蚀介质与基体的接触，腐蚀速率降低。 |
| 英文摘要: |
| The work aims to study the effect of corrosion time on the corrosion behavior of Q345 steel in a 4 g/L S2O32? based solution of sodium aluminate, to explore the law of corrosion and to clarify the corrosion mechanism. Salt corrosion and electrochemical corrosion methods were used to explore the corrosion behavior of Q345 steel by corrosion weight loss, polariza-tion curves, impedance spectroscopy, SEM and EDS. When the corrosion time was extended from 3 d to 7 d, the corrosion weight loss increased from 2.4505 g/m2 to 2.6420 g/m2 and the pitting depth increased from 3.3 μm to 4.6 μm. After 7 d, the corrosion weight loss and pitting depth tended to be stable. Corrosion rate equation was V=2.426t?0.975 and corrosion rate drastically decreased from 1 to 3 d. Initial corrosion current density was relatively large and corrosion current density rapidly decreased from 6.538 μA/cm2 to 0.785 μA/cm2 from 3 d to 5 d and then gradually decreased to 0.308 μA/cm2 on 9 d. Both the radius of capacitive reactance and the charge transfer resistance Rct increased with the increase of corrosion time. If the corrosion time prolonged, the content of O, Al, S and other elements in the product increased, and the content of Fe decreased. At the initial stage of corrosion, OH? preferentially is adsorbed to form denser Fe3O4 and FeOOH. At the middle stage of corrosion, S2O32? reacted with the matrix to form FeS with weaker adhesion. Thus, the structure of Fe3O4 becomes unstable and falls off and the structure of the product is loose. At the late stage of corrosion, Al(OH)3 is transformed into Al2O3, and AlO2? and Fe3O4 to form spinel FeAl2O4. The denser structure covers the surface of the substrate, hinders the contact between the corrosive medium and the substrate and reduces the corrosion rate. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| 关闭 |
|
|
|
渝公网安备 50010702501715号