高静水压力对水在环氧涂层中传输行为的影响

中国腐蚀与防护学报

2012, Vol. 32

Issue (3): 203-209

研究报告

本期目录 | 过刊浏览

高静水压力对水在环氧涂层中传输行为的影响

刘樱,刘莉,李瑛,王福会

中国科学院金属研究所金属腐蚀与防护国家重点实验室沈阳 110016

EFFECT OF HIGH HYDROSTATIC PRESSURE ON DIFFUSING BEHAVIOR OF WATER THROUGH EPOXY COATING

LIU Ying, LIU Li, LI Ying, WANG Fuhui

State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016

全文: PDF(977 KB)

摘要: 利用传统增重法和电化学阻抗测量技术研究了常压和深海高静水压力条件下水在环氧涂层中的传输行为。计算出了不同环境下水的扩散系数，并分析了静水压力对水在涂层中吸水动力学的影响。结果表明，高静水压力加速了水在涂层中的传输过程，使其扩散机制由常压下的理想Fick扩散行为变为S吸收型的非理想Fick扩散行为；扩散动力学参数，包括扩散速度、饱和时间和饱和吸水率均发生了明显变化；与涂层阻滞性能密切相关的涂层电容、涂层电阻和特征频率等参数随浸泡时间的变化在高压下也更为显著，涂层提前发生失效。

关键词 ：高静水压力, 环氧涂层, 传输, 电化学阻抗谱

Abstract：The diffusing behavior of water through epoxy coating under ordinary pressure (1 atm) and high hydrostatic pressures in deep ocean (35 atm) was investigated by traditional gravimetric method and electrochemical impedance spectroscopy (EIS). The corresponding diffusion coefficients were calculated and the effect of hydrostatic pressures on kinetics of water adsorption was also analyzed. The results showed that high hydrostatic pressure accelerated the diffusion process of water through organic coating, and the diffusion mechanism had been changed from ideal Fick diffusion under 1atm to S type adsorption non-ideal Fick diffusion under 35 atm. The parameters for diffusion kinetics, including diffusion velocity, saturation time and saturated percent of water adsorption were significantly different under two environments. The changes of parameters relevant to the barrier property of epoxy coating with immersion time were also severer under high pressure, including the coating capacitance C_c, coating resistance R_c, and break-point frequency f_b, resulting in coating failure before its lifetime.

Key words： high hydrostatic pressure epoxy coating diffusion EIS

收稿日期: 2011-04-19

ZTFLH:

TG172

通讯作者: 李瑛 E-mail: liying@imr.ac.cn

Corresponding author: LI Ying E-mail: liying@imr.ac.cn

作者简介: 刘樱，女，1986年生，硕士生，研究方向为深海腐蚀

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引用本文:

刘樱,刘莉,李瑛,王福会. 高静水压力对水在环氧涂层中传输行为的影响[J]. 中国腐蚀与防护学报, 2012, 32(3): 203-209.
LIU Ying, LIU Li, LI Ying, YU Fu-Hui. EFFECT OF HIGH HYDROSTATIC PRESSURE ON DIFFUSING BEHAVIOR OF WATER THROUGH EPOXY COATING. J Chin Soc Corr Pro, 2012, 32(3): 203-209.

链接本文:

https://www.jcscp.org/CN/ 或 https://www.jcscp.org/CN/Y2012/V32/I3/203

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