佘祖新,李茜,张伦武,李胤铭,王忠维.利用电化学阻抗谱研究水在聚丙烯涂层中的传输行为[J].表面技术,2021,50(2):321-326.
SHE Zu-xin,LI Qian,ZHANG Lun-wu,LI Yin-ming,WANG Zhong-wei.Investigation of Water Transportation Behavior of Polypropylene Coating by Using Electrochemical Impedance Spectrum[J].Surface Technology,2021,50(2):321-326
利用电化学阻抗谱研究水在聚丙烯涂层中的传输行为
Investigation of Water Transportation Behavior of Polypropylene Coating by Using Electrochemical Impedance Spectrum
投稿时间:2020-09-02  修订日期:2020-12-22
DOI:10.16490/j.cnki.issn.1001-3660.2021.02.034
中文关键词:  聚丙烯涂层  腐蚀防护  电化学阻抗谱  电解质  扩散  失效机制
英文关键词:polypropylene coating  corrosion protection  electrochemical impedance spectroscopy  electrolyte  diffusion  failure mechanism
基金项目:重庆市教育委员会科学技术研究项目(KJQN201901132);国防技术基础项目(JSZL2018601B004-1)
作者单位
佘祖新 西南技术工程研究所,重庆 400039;重庆江津大气环境材料腐蚀国家野外科学观测研究站,重庆 402260 
李茜 西南技术工程研究所,重庆 400039 
张伦武 西南技术工程研究所,重庆 400039;环境效应与防护重庆市重点实验室,重庆 400039 
李胤铭 重庆理工大学,重庆 400054 
王忠维 重庆理工大学,重庆 400054 
AuthorInstitution
SHE Zu-xin Southwest Institute of Technology and Engineering, Chongqing 400039, China;Jiangjin Atmospheric Material Corrosion Field National Observation and Research Station, Chongqing 402260, China 
LI Qian Southwest Institute of Technology and Engineering, Chongqing 400039, China 
ZHANG Lun-wu Southwest Institute of Technology and Engineering, Chongqing 400039, China;Chongqing Key Laboratory of Environmental Effect and Protection, Chongqing 400039, China 
LI Yin-ming Chongqing University of Technology, Chongqing 400054, China 
WANG Zhong-wei Chongqing University of Technology, Chongqing 400054, China 
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中文摘要:
      目的 研究聚丙烯涂层的失效机制。方法 利用电化学阻抗谱技术,对某聚丙烯涂层在3.5%NaCl溶液中的失效机制及水在该涂层中的传输行为进行了研究,使用等效电路图对电化学阻抗谱数据进行了拟合,评价了涂层在不同浸泡时间后的腐蚀保护性能,并计算了水在涂层中的扩散速率。结果 聚丙烯涂层浸泡在3.5%NaCl溶液后,其腐蚀防护性能会快速下降,当浸泡到第6天时,涂层阻值从初始5.33×109 Ω.cm2快速下降至1.08×109 Ω.cm2,随后开始稳定。通过对在10 kHz下涂层电容值随浸泡时间的变化关系获知,在浸泡初期,水在涂层中的渗透是均匀的,其传输行为符合Fick第二定律,属于复杂的非稳态过程,其扩散系数为3.12×10–11 cm2/s。水在涂层中的均匀传输时间与涂层阻值下降并达到稳定的时间基本相符,大约为144 h,此时涂层吸水率为8.25%。结论 聚丙烯树脂涂层在NaCl溶液中浸泡时,水的浸入及向金属基体方向传输是导致涂层失效的主要原因。在浸泡初期,水在涂层中的传输符合Fick第二定律,当水在涂层中传输不再符合Fick第二定律,水在涂层中到达饱和,此时涂层的保护性能大幅下降,腐蚀反应已经开始在界面发生。电化学阻抗谱技术可以很好地检测水在涂层中的传输行为,并给出量化数据,这可以用于评价涂层防护性能、预测涂层使用寿命和分析涂层失效机制。
英文摘要:
      The failure mechanism and the transportation behavior of water of a polypropylene coating in 3.5wt.%NaCl solution was investigated by electrochemical impedance spectroscopy (EIS). The EIS data were fitted by equivalent circuits, the corrosion protection performance in different immersing time was obtained, and the diffusion rate of water in the coating was calculated. The results indicated that the corrosion protection performance of the polypropylene coating was rapidly weakened after immersed in the 3.5wt.% NaCl solution. The resistance of the coating dramatically dropped from 5.33×109 Ω.cm2 to 1.08×109 Ω.cm2 after immersed for 6 days, and then became stable. Based on the relation between the capacitance of coating and immersing time under 10 kHz, the water had uniform penetration in the coating at the early stage, and its transportation behavior followed the second Fick’s law, which was a complex unsteady process. The diffusion coefficient was 3.12×10–11 cm2/s. The time of homogeneous diffusion of water in the coating is about 144 h, consistent with the time for the resistance of coating dropped down to a stable value. At this time, the water absorptivity of the coating was 8.25wt.%. When the polypropylene resin coating was immersed in NaCl solution, the infiltration of water and its transportation to the metal substrate was the main reason to lead the failure of the polypropylene coating. When the water transportation did not follow the the second Fick’s law, the water in the coating reached saturation. At that time, the protection performance of the coating was hugely declined, and the corrosion reaction has begun to occur at the interface. It could be known from this study that the EIS could be well used in detecting the diffision of water through coating quantitatively. This could be used in evalating the protection performance of coating, preticting the service life and analysing failure mechanism.
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