ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Surface Treatment and Corrosion
Corrosion Process of Inorganic Zinc-Rich Painted Steel Exposed to a High-Chloride Atmospheric Environment
Makoto NagasawaNobuhiro OkadaNobuo OtsukaToshiaki Ohtsuka
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2018 Volume 58 Issue 2 Pages 316-322

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Abstract

The corrosion protection behavior of an inorganic zinc-rich paint (IZRP) layer on steel after exposure for five years in Okinawa, relatively high-chloride atmosphere, was studied. Zinc particles were uniformly dissolved in the IZRP-coated steel, independent of the distance from the IZRP surface. From XRD, FT-IR, Raman spectroscopy and EPMA analyses, Zn5(OH)8Cl2H2O and ZnO were generated in the entire corrosion layer. Mg and Ca were observed in the outer area. We proposed the corrosion process of IZRP-coated steel from a detailed analysis of the corrosion products.

Raman scattering spectra in the zinc corrosion product layer at three points. Fullsize Image
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© 2018 by The Iron and Steel Institute of Japan
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