Hu Chaohe*,Hang Zhijun,Wang Yuan.Properties of the high-efficiency composite corrosion inhibitor for chloride-based deicing agents[J].Plating & Finishing,2023,(9):23-30.[doi:10.3969/j.issn.1001-3849.2023.09.004]
氯盐型融雪剂用高效复合缓蚀剂的性能研究
- Title:
- Properties of the high-efficiency composite corrosion inhibitor for chloride-based deicing agents
- Keywords:
- corrosion resistance ; deicing agent ; corrosion inhibitor ; metal corrosion
- 分类号:
- TG174.42
- 文献标志码:
- A
- 摘要:
- 为解决氯盐型融雪剂对金属的严重腐蚀问题，制备了一种适合于高浓度氯离子环境的高效复合缓蚀剂，其在较低添加量下（ 820 mg·L－1 ）即可有效抑制盐水对碳钢的腐蚀，其缓蚀率高达 98.2% ，相比于亚硝酸钠、钼酸钠、六偏磷酸钠等传统缓蚀剂具有更优异的缓蚀性能。通过对腐蚀实验后碳钢试片的表面分析结果，确定了复合缓蚀剂对碳钢腐蚀的抑制作用。电化学测试结果表明：该复合缓蚀剂的存在会降低腐蚀电流密度，提高界面电荷转移电阻，属于抑制阳极反应型的缓蚀剂。通过综合表征手段，对复合缓蚀剂对碳钢的协同保护机制进行了推测分析，其缓蚀性可能是由于在金属表面形成了致密的钝化膜，阻断了腐蚀介质与金属的直接接触。
- Abstract:
- ： To solve the corrosion of metals caused by chloride-based deicing agents ， a high-efficiency composite corrosion inhibitor fitting for high-concentration chloride ion environments was prepared ， which can effectively inhibit the corrosion of NaCl solution at a low concentration （ 820 mg·L – 1 ）， and its corrosion inhibition rate is as high as 98.2%. Compared with the typical traditional corrosion inhibitors ， such as sodium nitrite ， sodium molybdate ， sodium hexametaphosphate ， etc. ， it possesses more excellent corrosion inhibition performance ， which was characterized through the analysis of the surface of the carbon steel after the corrosion treatment. The results of electrochemical characterization show that the presence of the composite corrosion inhibitor can reduce the corrosion current density and increase the interface charge transfer resistance ， which means this composite corrosion inhibitor mainly acts on the anode reactions. Through comprehensive characterizations ， the synergistic protection mechanism of composite corrosion inhibitors on carbon steel is speculated and analyzed. It may be due to the formation of a dense inert layer on the metal surface ， which blocks the direct contact between the solution and the metal.
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备注/Memo
收稿日期： 2023-04-10 修回日期： 2023-07-06 * 通信作者： 胡超鹤（ 1993 —），男，博士，助理研究员，研究方向：缓蚀技术、矿用油品、高分子复合材料等， email ： chaohe.hu@outlook.com 基金项目： 天地科技股份有限公司科技创新创业资金专项资助项目（ 2022-2-TD-QN004 ）