Resistance of metallic substrates protected by an organic coating containing glass flakes

被引：72

作者：

Gonzalez-Guzman, J. ^{[1
]}

Santana, J. J. ^{[1
]}

Gonzalez, S. ^{[1
]}

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

机构：

[1] Univ La Laguna, Dept Phys Chem, E-38071 Tenerife, Canary Islands, Spain

来源：

PROGRESS IN ORGANIC COATINGS | 2010年 / 68卷 / 03期

关键词：

Organic coatings; Corrosion prevention; Electrochemical impedance spectroscopy; Glass flake pigments; Epoxy-polyamine; ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY; CORROSION PROTECTION; PAINTED METALS; COATED STEEL;

D O I：

10.1016/j.porgcoat.2010.01.005

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

The resistance against corrosion of an epoxy-polyamine-based coating immersed in a 3 wt.% sodium chloride solution was investigated by electrochemical impedance spectroscopy (EIS). The organic coating contained glass flakes as pigment in order to enhance its barrier characteristics. The data show that this coating is more strongly adhered and exhibits higher protection characteristics when applied onto carbon steel substrates than on galvanized steel. Though the capacitance of the coating (C-C) does not show any appreciable variation with immersion time, the resistance (R-PO) of the film is observed to increase with time upon immersion. The analysis of the data sustains that the organic film behaves as a porous, non-barrier coating. Two time constants are observed even at earlier exposures, and the improved corrosion resistance developed after the coating system was exposed to the test electrolyte is considered to originate from the precipitation of corrosion products within the pores in the film. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：240 / 243

页数：4

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