樊保民,郝华,杨彪,马震,冯云皓.超分子缓蚀剂在冷凝水管线钢表面的组装机理[J].表面技术,2018,47(10):22-29.
FAN Bao-min,HAO Hua,YANG Biao,MA Zhen,FENG Yun-hao.Assembly Mechanism of a Supramolecular Corrosion Inhibitor on the Condensate Pipeline Steel[J].Surface Technology,2018,47(10):22-29 |
| 超分子缓蚀剂在冷凝水管线钢表面的组装机理 |
| Assembly Mechanism of a Supramolecular Corrosion Inhibitor on the Condensate Pipeline Steel |
| 投稿时间：2018-02-11 修订日期：2018-10-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2018.10.003 |
| 中文关键词: 十八胺 羟丙基-β-环糊精 蒸汽冷凝水 碳钢 超分子化学 缓蚀组装 |
| 英文关键词:octadecylamine hydroxypropyl-β-cyclodextrin condensate water mild steel supramolecular chemistry inhi-bition self-assembly |
| 基金项目:国家自然科学基金（21606005，51473007）；北京市教委科技计划一般项目（SQKM201710011001） |
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| Author | Institution |
| FAN Bao-min | 1. Beijing Technology and Business University, Beijing 100048, China |
| HAO Hua | 2. Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China |
| YANG Biao | 1. Beijing Technology and Business University, Beijing 100048, China |
| MA Zhen | 1. Beijing Technology and Business University, Beijing 100048, China |
| FENG Yun-hao | 1. Beijing Technology and Business University, Beijing 100048, China |
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| 中文摘要: |
| 目的 探究十八胺超分子缓蚀剂（HPDA）在蒸汽冷凝水中对碳钢的缓蚀效应，明晰其在冷凝水管线钢表面的组装机理。方法 采用动态失重（旋转挂片）法、电化学测试与表面微观形貌观察，分析HPDA在40 ℃冷凝水中对20#钢的缓蚀效应，并通过X-射线光电子能谱与静态接触角变化，明确HPDA在20#钢表面的缓蚀组装机理。结果 动态失重结果表明，HPDA可有效减缓20#钢在冷凝水中的腐蚀，随添加浓度的升高，腐蚀速率下降，缓蚀率上升；当添加100 mg/L HPDA，浸泡72 h后，缓蚀率达到94.11%；同时，在同一添加浓度（100 mg/L）下浸泡约60 h后，缓蚀率开始趋于平稳。动电位扫描研究表明，HPDA可同时抑制20#钢在冷凝水中腐蚀反应的阳极与阴极过程并减小腐蚀电流密度，有效减缓腐蚀，且随添加浓度的增加，缓蚀效果增强，属于阳极抑制为主的混合型缓蚀剂。电化学阻抗谱研究表明，20#钢在冷凝水中的腐蚀仅受电荷转移控制，添加HPDA不改变腐蚀机理，但可显著增大极化阻抗以减缓腐蚀。表面形貌分析显示，加入HPDA后，20#钢试样表面未发现明显的腐蚀迹象，且粗糙度接近新打磨试样。同时，经HPDA处理后的20#钢试样表面呈现疏水特征，且未检测到主体化合物（羟丙基-β-环糊精）的相关价键信息，说明仅有客体十八胺分子在碳钢表面组装成膜。结论 HPDA可有效减缓20#钢在冷凝水中的腐蚀，通过“释放”客体十八胺分子并使其在碳钢表面有序组装形成疏水膜来发挥缓蚀作用。 |
| 英文摘要: |
| The work aims to clarify the corrosion inhibition effect of a supramolecular complex (HPDA) (based on octade-cylamine (ODA) and hydroxypropyl-β-cyclodextrin (HP-β-CD)) on 20# mild steel in the condensate water, and illuminate the assembly mechanism on the pipeline steel. The inhibition effect of HPDA on 20# mild steel in the condensate water was evaluated through dynamic weight loss, electrochemical tests and surface morphology observation. In addition, X-ray photoelectron spectrometry (XPS) and static contact angles were applied to define the assembly mechanism of corrosion inhibition of HPDA on the pipeline steel. According to the results of dynamic weight loss, the corrosion process of 20# mild steel in the condensate water could be effectively retarded in the presence of HPDA. As the concentration of HPDA increased, the corrosion rate of 20# mild steel decreased along with the increased inhibition efficiency (η, %). The value of η could reach 94.11% after 72 h immersion in the condensate water at 40 °C with 100 mg/L HPDA. Besides, the value of η tended to be constant after 60 h immersion in the same concentration. From the results of potentiodynamic polarization, both the anodic and cathodic processes for the corrosion of 20# mild steel in the condensate water were inhibited in the presence of HPDA. The corrosion current was also reduced significantly after HPDA was added. HPDA could effective inhibit the corrosion and the corrosion inhibition effects could increase with the increase of concentration of added HPDA. HPDA was a kind of mixed corrosion inhibitor focusing on anodic process. From the electrochemical impedance spectroscopy, the corrosion of 20# mild steel in the condensate water was controlled by charge transfer process and was hardly altered by the addition of HPDA; but the polarization resistance could be hugely enhanced in the presence of HPDA. The analysis of surface morphology showed that no obvious corrosion was observed in the the sample of 20# mild steel after HPDA was added and the roughness closed to the newly polished sample. The surface of 20# mild steel in the presence of HPDA showed hydrophobic characteristics, but no valence linkage of host compound (Hydroxypropyl-beta-cyclodextrin) was detected, which indicated that only guest molecules (ODA) was assembled on the steel surface. The corrosion of 20# mild steel in the condensate water can be inhibited effectively by HPDA which can release guest molecules (ODA) and assemble the molecules to hydrophobic membrane on the mild steel surface to provided corrosion inhibition. |
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