Add time:08/06/2019         Source:sciencedirect.com

This study aims at development of a high-performance nano-film based on poly acrylic acid and neodymium cation. The microstructure, chemical composition, topography and surface chemistry of deposited film were studied by field emission scanning electron microscope (FE-SEM), electron dispersive spectroscopy (EDS), attenuated total reflection (ATR) and X-ray photoelectron spectroscopy (XPS), atomic force microscope (AFM) and contact angle evaluation. The corrosion resistance of the samples treated by Nd-PAA (Neodymium-Poly acrylic acid) composite was studied by electrochemical impedance spectroscopy (EIS) and polarization tests, respectively. Also for further examination, the film formation and active adsorption sites were surveyed by computational studies. The result showed the precipitation of a dense and crack free and ultrafine Nd-PAA film on the steel surface. It was found that the PAA retarded the precipitation of Nd on the surface. Neodymium was present in both trivalent and tetravalent state. Due to the anionic nature of the PAA, high volume of Nd-PAA complexes deposited in the surface. Also, the positive role of PAA addition on the steel substrate corrosion resistance enlargement was proved by electrochemical tests results. The molecular simulation outcomes clarified the adsorption of neodymium-poly acrylic acid complex on the iron substrate.

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