Monitoring the degradation of a high solids epoxy coating by means of EIS and EN

被引：73

作者：

Sanchez-Amaya, J. M. ^{[1
]}

Osuna, R. M. ^{[1
]}

Bethencourt, M. ^{[1
]}

Botana, F. J. ^{[1
]}

机构：

[1] Univ Cadiz, Dept Ciencia Mat Ingn Met & Quim Inorgan, CASEM, E-11510 Puerto Real, Spain

来源：

PROGRESS IN ORGANIC COATINGS | 2007年 / 60卷 / 03期

关键词：

monitoring; EIS; EN; high solid coating; degradation;

D O I：

10.1016/j.porgcoat.2007.07.020

中图分类号：

O69 [应用化学];

学科分类号：

081704 [应用化学];

摘要：

This paper reports a study of the degradation processes suffered by steel samples painted with a high solid content epoxy coating. Because this coating shows a high resistance when exposed to NaCl solutions, HCI solutions were employed to accelerate the corrosion processes. Macroscopic images were used to observe the coating degradation. Then electrochemical techniques, electrochemical impedance spectroscopy (EIS) and electrochemical noise (EN) were employed to monitor the corrosion behaviour of the system studied. A close correlation was found between EIS and EN data. Several parameters were estimated using these techniques: R-po, R-ct, C-c, C-dt, and Z(0.1 Hz) using EIS, and R-n using EN. In addition, a new parameter estimated by means of EN was employed, Z(0.1Hz)(EN). The evolution of all these parameters with time enabled the effective monitoring of the degradation stage of the coating. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：248 / 254

页数：7

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