聚二甲基硅氧烷涂层自修复过程中的弛豫时间分布研究

doi:10.11902/1005.4537.2022.117

中国腐蚀与防护学报

2023, Vol. 43

Issue (2): 337-344 CSTR: 32134.14.1005.4537.2022.117 DOI: 10.11902/1005.4537.2022.117

中国腐蚀与防护学报编委、青年编委专栏

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聚二甲基硅氧烷涂层自修复过程中的弛豫时间分布研究

王通, 王巍(

)

中国海洋大学材料科学与工程学院青岛 266100

Distribution of Relaxation Time of Polydimethylsiloxane Coatings During Self-healing Process

WANG Tong, WANG Wei(

)

School of Materials Science and Engineering, Ocean University of China, Qingdao 266100, China

全文: PDF(6079 KB) HTML

摘要:

针对传统电化学分析技术不能完全反映有机涂层腐蚀电化学过程的问题，采用弛豫时间分布 (DRT) 技术分析电化学阻抗谱 (EIS)，研究了聚二甲基硅氧烷 (PDMS) 涂层在长效防腐过程及“人工划伤-自修复”循环过程中的动态弛豫时间分布。结果表明：结合等效电路模型分析方法，DRT技术能够清晰地分析PDMS涂层电化学过程中总电化学阻抗的组成及各部分贡献率，并从理论方面阐明了EIS等效电路中各元件对应的弛豫时间归属问题。为腐蚀电化学机理研究提供了一种新的分析技术。

关键词 ：有机涂层, 电化学阻抗谱, 弛豫时间分布, 等效电路, 机理, 自修复

Abstract：

Traditional electrochemical analysis techniques cannot fully reflect the electrochemical process of organic coating corrosion. Hence, distribution of relaxation time (DRT) technique was adopted to fit the electrochemical impedance spectrum (EIS), meanwhile, the distribution of relaxation time of the long-term anticorrosion process of polydimethylsiloxane coatings without and with artificial scratches was investigated, in other word, the later one experienced self-healing cycles. The results show that the function of the EIS itself as a whole and the contribution proportion of each element of the EIS of the coating during the corrosion process can be clearly analyzed via the DRT technique combined with equivalent circuit model analysis. Meanwhile, the corresponding relaxation time of each element in EIS equivalent circuit was discussed theoretically. This paper provides a new analytical technique for corrosion electrochemical mechanism study.

Key words： organic coating electrochemical impedance spectroscopy distribution of relaxation time equivalent circuit mechanism self-healing

收稿日期: 2022-04-18 32134.14.1005.4537.2022.117

ZTFLH:

TG174

基金资助:国家自然科学基金(42076039)

作者简介: 王通，男，1998年生，硕士生

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引用本文:

王通, 王巍. 聚二甲基硅氧烷涂层自修复过程中的弛豫时间分布研究[J]. 中国腐蚀与防护学报, 2023, 43(2): 337-344.
Tong WANG, Wei WANG. Distribution of Relaxation Time of Polydimethylsiloxane Coatings During Self-healing Process. Journal of Chinese Society for Corrosion and protection, 2023, 43(2): 337-344.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2022.117 或 https://www.jcscp.org/CN/Y2023/V43/I2/337

图1 PDMS涂层合成路线

图2 PDMS涂层合成过程中反应物和反应产物的红外谱图

图3 PDMS涂层SEM图像

图4 PDMS涂层自修复LCSM图像

图5 聚二甲基硅氧烷涂层长效防腐过程中的EIS图

图6 聚二甲基硅氧烷涂层长效防腐过程中的等效电路模型

图7 聚二甲基硅氧烷涂层长效防腐过程中的DRT分析

表1 聚二甲基硅氧烷涂层长效防腐过程中DRT分析时间常数面积比

图8 聚二甲基硅氧烷涂层在划伤-自修复循环过程中的EIS图

图9 聚二甲基硅氧烷涂层在修复-划伤循环中的等效电路模型

图10 聚二甲基硅氧烷涂层每次修复后的DRT分析

图11 聚二甲基硅氧烷涂层每次划伤后的DRT分析

表2 聚二甲基硅氧烷涂层每次修复后DRT分析时间常数面积比

表3 聚二甲基硅氧烷涂层每次划伤后DRT分析时间常数面积比

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