Corrosion Process of Inorganic Zinc-Rich Painted Steel Exposed to a High-Chloride Atmospheric Environment

Makoto Nagasawa; Nobuhiro Okada; Nobuo Otsuka; Toshiaki Ohtsuka

doi:10.2355/isijinternational.ISIJINT-2017-548

Surface Treatment and Corrosion

Corrosion Process of Inorganic Zinc-Rich Painted Steel Exposed to a High-Chloride Atmospheric Environment

Makoto Nagasawa , Nobuhiro Okada, Nobuo Otsuka, Toshiaki Ohtsuka

Author information

Keywords: zinc-rich paint, steel, corrosion, protection, simulation

JOURNAL OPEN ACCESS FULL-TEXT HTML

2018 Volume 58 Issue 2 Pages 316-322

DOI https://doi.org/10.2355/isijinternational.ISIJINT-2017-548

Details

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

Corresponding author

Register with J-STAGE for free!