期刊
CORROSION ENGINEERING SCIENCE AND TECHNOLOGY
卷 51, 期 2, 页码 82-89出版社
TAYLOR & FRANCIS LTD
DOI: 10.1179/1743278215Y.0000000032
关键词
Corrosion; Cathodic electrocoating; Galvanised steel; EIS; Salt spray
资金
- Irankhodro automotive manufacturing Co.
Cathodic electrocoatings were applied onto phosphated normal and galvanised steel substrates with average dry film thicknesses of 20 and 12 mm. To evaluate the anticorrosion properties of the coatings, electrochemical impedance spectroscopy and salt spray tests were carried out on the samples. The results showed that, by increasing the curing temperature, the protective properties of electrocoated galvanised steel are improved to a higher extent compared to normal steel panels. This was indicated by a pore resistance of two orders of magnitude higher in the case of galvanised steel panels. At lower curing temperatures, the corrosion resistance of electrocoated normal steel panels is better than that of the galvanised steel, indicated by a two orders of magnitude higher pore resistance value. On the other side, the salt spray test could not recognise the difference between protective properties of different coating films on galvanised steel suitably, and this is one of the notable disadvantages of this test.
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