摘要
以聚乙烯吡咯烷酮为原料,采用水热法合成了一种环保、高效的氮掺杂碳点(N-CDs)。利用傅里叶变换红外光谱(FTIR)对其结构进行了表征,采用电化学方法、失重法和扫描电子显微镜(SEM)研究了N-CDs在1 mol/L HCl溶液中对Q235钢的缓蚀性能和缓蚀机理。结果表明,当N-CDs的用量为200 mg/L时,缓蚀率可高达95.6%。电化学试验表明,N-CDs是一种混合型缓蚀剂,但主要是抑制阳极的反应。其缓蚀机理是:N-CDs在Q235钢表面以物理吸附和化学吸附的共同作用在Q235钢表面形成稳定的吸附膜,从而有效地抑制1 mol/L HCl溶液对碳钢的腐蚀,且符合Langmuir等温吸附模型。另外,SEM清晰观察到加入N-CDs后,Q235钢的腐蚀程度得到了明显的改善。
An environmentally friendly and highly efficient N-CDs is synthesized by hydrothermal method with polyvinylpyrrolidone as raw materials.Its structure is characterized by FTIR.The corrosion inhibition performance and corrosion inhibition mechanism of N-CDs on Q235 steel in 1 mol/L HCl solution are studied by electrochemical method,weight loss method and scanning electron microscope(SEM).The results show that when the dosage of N-CDs is 200 mg/L,the corrosion inhibition efficiency could be as high as 95.6%.The electrochemical tests show that N-CDs is a mixed corrosion inhibitor which mainly inhibits the anode reaction.The inhibition mechanism is that N-CDs forms a stable adsorption film on the surface of Q235 steel under the combined action of physical adsorption and chemical adsorption,which effectively inhibits the corrosion of carbon steel by 1 mol/L HCl solution,and follows with Langmiur isothermal model.In addition,SEM clearly observes that the corrosion degree of Q235 steel is obviously improved after adding N-CDs.
作者
肖晗
董社英
袁小静
石莹
侯道林
XIAO Han;DONG Sheying;YUAN Xiaojing;SHI Ying;HOU Daolin(School of Chemistry and Chemical Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China)
出处
《功能材料》
CAS
CSCD
北大核心
2021年第8期8138-8143,共6页
Journal of Functional Materials
基金
陕西省重点研发计划资助项目(2020GY-306)
国家自然科学基金资助项目(21807086)。
关键词
氮掺杂碳点
缓蚀剂
吸附
缓蚀性能
Q235钢
nitrogen doped carbon dots
corrosion inhibitor
adsorption
corrosion inhibition performance
Q235 steel
