水在有机涂层中的传输ⅠFick扩散过程

中国腐蚀与防护学报

2002, Vol. 22

Issue (5): 311-315

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水在有机涂层中的传输ⅠFick扩散过程

胡吉明;张鉴清;谢德明

浙江大学化学系电化研究室

WATER TRANSPORT IN ORGANIC COATINGSⅠ: FICKIAN DIFFUSION

Jiming Hu;Jianqing Zhang;Deming Xie

浙江大学化学系电化研究室

全文: PDF(146 KB)

摘要: 涂层金属的耐腐蚀性能取决于其对腐蚀介质的的阻挡能力，在水溶液及含水大气中则主要取决于水分子及其它侵蚀性粒子(O2、Cl-等)的渗透能力.介绍了Fick扩散条件下H2O在涂层中的扩散行为及其与涂层阻抗间的关系，并探讨阻抗方法在涂层评价中的适用条件.

关键词 ：有机涂层, 水传输, Fick扩散, 阻抗

Abstract：In the present paper a review was given on water di ffusion behaviors in polymer films and coating impedance according to Fickian pr ocess.In the case of linear Fickian diffusion,a mathematical relationship betwee n the water-uptake in organic coatings and capacitance,C,of coatings was est ablished.The change rate of coating capacitance was mainly depended on the water diffusion coefficient,D,in coatings.In the initial stage of water-uptaking, a linear relationship is shown in the curves lnC(t)～time0.5,with the slope proportional to D0.5.Under the non-linear diffusion,water prefe rentiall y penetrated through the cracks or the boundaries of foreign particles by sheari ng diffusion,while in the bulk coatings by linear one.The contribution by linear diffusion could be eliminated with the presence of obvious porosity,and the coa ting capacitance was mainly determined by the porosity of coatings,θ.The sl ope of the linear part in lnC(t)～t0.5 curves was proportional to θ 0.5.

Key words： organic coatings water transport Fickian diffusion im pedance

收稿日期: 2001-02-27

ZTFLH:

TG174.46

通讯作者: 胡吉明 E-mail: hujiming@263.net

Corresponding author: Jiming Hu E-mail: hujiming@263.net

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引用本文:

胡吉明; 张鉴清; 谢德明 . 水在有机涂层中的传输ⅠFick扩散过程[J]. 中国腐蚀与防护学报, 2002, 22(5): 311-315 .
Jiming Hu, Jianqing Zhang, Deming Xie. WATER TRANSPORT IN ORGANIC COATINGSⅠ: FICKIAN DIFFUSION. J Chin Soc Corr Pro, 2002, 22(5): 311-315 .

链接本文:

https://www.jcscp.org/CN/ 或 https://www.jcscp.org/CN/Y2002/V22/I5/311

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