The characterization of product film formed on Ni-containing weathering steel in simulated marine atmosphere was investigated by using electrochemical impedance spectroscopy, X-ray diffraction and X-ray photoelectron spectroscopy measurements. The results showed that the alloying elements Ni and Cu existed in the inner layer of corrosion product film in the form of NiO, NiFe2O4, Ni (OH) 2 and CuFeO2, CuFe2O4 and CuO, respectively. Among them, NiFe2O4 and CuFe2O4 were the main ones that had a great influence on corrosion resistance. The content of NiFe2O4 in the corrosion product of 3Ni weathering steel was the highest and its protection was better. When the content of Ni was 1.5, the formation of NiFe2O4 may be inhibited due to the high content of CuFe2O4 in the corrosion product, which was not conducive to the formation of protective corrosion product film.

Subject
X-ray diffraction, Films, Electrochemical impedance spectroscopy, Alloying elements, Corrosion products, Film formation, Weathering, Steel, Maritime, Carbon steel, Corrosion protection, Corrosion resistance, Elements
Keywords:
3Ni weathering steel, tropical marine atmosphere, corrosion product film, XPS
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2020
Association for Materials Protection and Performance (AMPP)
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