何伟,刘金彦,王佳,刘倩.6-DAS/DMIC对Q235钢在甲醇甲酸介质中的缓蚀协同作用[J].表面技术,2024,53(6):111-122, 143.
HE Wei,LIU Jinyan,WANG Jia,LIU Qian.Synergistic Inhibition Effect of 6-DAS/DMIC on Q235 Steel in Methanol/Formic Acid Medium[J].Surface Technology,2024,53(6):111-122, 143 |
| 6-DAS/DMIC对Q235钢在甲醇甲酸介质中的缓蚀协同作用 |
| Synergistic Inhibition Effect of 6-DAS/DMIC on Q235 Steel in Methanol/Formic Acid Medium |
| 投稿时间：2022-11-12 修订日期：2023-08-08 |
| DOI：10.16490/j.cnki.issn.1001-3660.2024.06.010 |
| 中文关键词: 缓蚀剂 Q235钢 腐蚀防护 分子吸附 协同作用 |
| 英文关键词:inhibitors Q235 steel corrosion protection molecular adsorption synergism |
| 基金项目:内蒙古自然科学基金(020LH02007) |
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| Author | Institution |
| HE Wei | School of Chemistry and Chemical Engineering, Inner Mongolia University of Science and Technology, Inner Mongolia Baotou 014000, China |
| LIU Jinyan | School of Chemistry and Chemical Engineering, Inner Mongolia University of Science and Technology, Inner Mongolia Baotou 014000, China |
| WANG Jia | School of Chemistry and Chemical Engineering, Inner Mongolia University of Science and Technology, Inner Mongolia Baotou 014000, China |
| LIU Qian | School of Chemistry and Chemical Engineering, Inner Mongolia University of Science and Technology, Inner Mongolia Baotou 014000, China |
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| 中文摘要: |
| 目的 研究6-脱氢枞酰胺基己酸钠和1-十二烷基-3-甲基咪唑氯盐作为复配缓蚀剂对Q235钢在甲醇甲酸腐蚀溶液的协同缓蚀作用。方法 通过静态失重法、电化学极化测试和电化学阻抗法，结合SEM、EDX、AFM等一系列表面表征技术验证了复配缓蚀剂的性能与行为，同时利用软件模拟计算缓蚀剂分子的轨道排布与分子动力学，揭示分子结构与缓蚀性能间的联系。结果 该复配缓蚀剂能够抑制Q235钢在甲醇甲酸介质中的腐蚀过程，降低腐蚀速率。缓蚀效率随复配比的提高而增大。在复配比为6-DAS∶DMIC=1∶8时，失重法测得缓蚀效率最高达到93.98%;通过电化学法获得的缓蚀效率最高达到92.32%，并且通过电位的移动证明其为控制阳极过程的混合型缓蚀剂。表征技术表明，该复配缓蚀剂能有效吸附并在钢表面形成一层缓蚀分子膜层，其可以隔绝腐蚀介质与金属的接触，保护基底金属免受介质的腐蚀。结论 该复配缓蚀剂能够有效降低腐蚀介质对Q235钢的侵蚀作用，实验数据与表征技术相互吻合，证明了该复配缓蚀剂是一种优良的有机缓蚀剂。研究结果为后续开发更高效的绿色缓蚀剂提供了思路和方法。 |
| 英文摘要: |
| Corrosion inhibitors are widely used to prevent metal corrosion, and they are particularly effective in improving the corrosion resistance of materials without compromising the integrity of the metal body during the production of steel products. This technology is crucial in ensuring the longevity and durability of metal structures and equipment, and has significant implications for industries such as manufacturing, construction, and transportation. Corrosion occurs when steel materials are exposed to organic acid medium, which destroys the flatness of steel surface and becomes the source of defects such as pitting corrosion and microcrack. The corrosion inhibition performance of dehydroabietylamide sodium caproate (6-DAS) and 1-dodecyl-3-methylimidazolium chloride (DMIC) compound corrosion inhibitors on Q235 steel in 0.1 mol/Lformic acid/10 mol/L methanol corrosion solution was studied. Q235 steel was cut into 30 mm×20 mm×3 mm as a small sample, using metallographic sandpaper grinding and degreasing step by step for weight loss method. The corrosion inhibition performance of different concentrations of a single corrosion inhibitor and a 6-DAS/DMIC compound corrosion inhibitor modulated by 1∶1, 1∶2, 1∶4 and 1∶8 compound ratio on Q235 steel immersed in 30 ℃ 0.1 mol/L formic acid/10 mol/L methanol medium for 3 d was studied. 10 mm×10 mm×3 mm Q235 steel was used for an electrochemical analysis and other characterization techniques. The potentiodynamic polarization method in the scanning potential –150-350 mV at a rate of 5 mV/s and an impedance spectroscopy at the open circuit potential scanning frequency 100 kHz-10 mHz were adopted and AC amplitude of 10 mV was as the fluctuation signal. Subsequently, the microstructure of the steel surface before and after the application of the corrosion inhibitor was observed with a scanning electron microscope (Hitachi S-4800) and an atomic force microscope (Bruker Dimension Icon). The composition of the steel surface was analyzed through techniques such as Raman spectroscopy (HR Evolution), energy dispersive X-ray spectroscopy (Oxford energy), and X-ray photoelectron spectroscopy (Escalab 250 Xi) to identify any differences between the steel surface and blank samples. Furthermore, the aggregation of the corrosion inhibitor molecules on the steel surface to form a protective layer was investigated to determine the effectiveness of the inhibitor. Meanwhile, the orbital arrangement and molecular dynamics of corrosion inhibitor molecules were simulated by Material studio software, and the relationship between molecular structure and inhibition performance was revealed. The results obtained from the gravimetric and electrochemical techniques indicated that the corrosion inhibition efficiency of the single inhibitor increased with the increase of its concentration. In the test concentration range, the highest corrosion inhibition rate of 6-DAS reached 92%, and the maximum corrosion inhibition rate of DMIC was 53.83%. When the corrosion inhibitor compound ratio was 1∶8, the highest corrosion inhibition efficiency reached 93.98%, which was higher than the application efficiency of the single corrosion inhibitor. Electrochemical method confirmed that the presence of the corrosion inhibitor indeed reduced the corrosion current density of Q235 steel in corrosive medium. Microstructure analysis showed that the presence of inhibitor molecules made the steel surface smooth and micro-cracks reduced, and reduced the corrosion of methanol/formic acid medium effectively. The characterization technology verified that the corrosion inhibitor molecules existed and were evenly distributed on the surface of the steel, which provided a basis for the analysis of the protection mechanism of the corrosion inhibitor. The 6-DAS/DMIC compound inhibitor deposited a layer of inhibitor molecular film on the surface of the steel at the optimal compounding ratio, which isolated the contact between the corrosive medium and the steel surface, and effectively inhibited the corrosion of the steel by the methanol/formic acid medium. It is proved that the compound corrosion inhibitor is an excellent organic corrosion inhibitor. The research results provide ideas and methods for the subsequent development of more efficient green corrosion inhibitors. |
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