Determination of water uptake in organic coatings deposited on 2024 aluminium alloy: Comparison between impedance measurements and gravimetry

被引：64
作者：
Anh Son Nguyen [1 ,2 ]
Causse, Nicolas [1 ]
Musiani, Marco [3 ]
Orazem, Mark E. [4 ]
Pebere, Nadine [1 ]
Tribollet, Bernard [5 ]
Vivier, Vincent [5 ]
机构：
[1] Univ Toulouse, CNRS, CIRIMAT, INPT,UPS,ENSIACET, 4 Allee Emile Monso,BP 44362, F-31030 Toulouse 4, France
[2] VAST, Inst Trop Technol, Lab Protect Coatings, 18 Hoang Quoc Viet, Hanoi, Vietnam
[3] CNR, Inst Condensed Matter Chem & Technol Energy, ICMATE, Corso Stati Uniti 4, I-35127 Padua, Italy
[4] Univ Florida, Dept Chem Engn, Gainesville, FL 32611 USA
[5] UPMC Univ Paris 06, Sorbonne Univ, CNRS, Lab Interfaces & Syst Electrochim, 4 Pl Jussieu, F-75005 Paris, France
来源：
PROGRESS IN ORGANIC COATINGS | 2017年 / 112卷
关键词：
Water-based protective coatings; Electrochemical impedance; Complex-capacitance; Resistivity distribution; Water uptake; PHASE-ELEMENT PARAMETERS; CAPACITANCE MEASUREMENTS; RESISTIVITY DISTRIBUTIONS; ANTICORROSION COATINGS; DIELECTRIC-PROPERTIES; CORROSION-PROTECTION; KINGSBURY EQUATION; FREE FILMS; SPECTROSCOPY; EIS;
D O I：
10.1016/j.porgcoat.2017.07.004
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
Electrochemical impedance spectroscopy (EIS) and gravimetric measurements on two water-based coatings, containing either SrCrO4 or a mixture of Cr(VI)-free pigments and deposited on 2024 aluminium alloy, were performed to follow the water uptake in a 0.5 M NaCl solution as a function of exposure time. To account for the observed non-ideal capacitive behaviour, the coating capacitance and dielectric constant values were extracted from the EIS data in two ways: (i) by using a complex-capacitance representation and (ii) by fitting to the EIS data a model that assumed an exponential distribution of coating resistivity. The agreement of values obtained by these independent methods served to validate the model used to account for the observed pseudo constant phase-element (CPE) behaviour of the coatings. The water uptake calculated from dielectric constant values, employing a linear combination formula, was in good agreement with that directly measured by gravimetry, using supported-films.
引用
收藏
页码：93 / 100
页数：8
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