Study of Corrosion Behaviour of Molybdenum Series Coatings on Galvanized Steel

Abstract:

In this paper, an organic/inorganic molybdenum series Cr-free coating was formed on galvanized steel by simple immersion and its corrosion behavior was compared to that of a typical chromate coating. Molybdate and 1-Hydroxy-ethylidene-1, 1-diphosphonic acid (HEDP) were used as corrosion inhibitor, as well as acrylic resin and silane were used as film-former and coupling agents, respectively. The corrosion behavior of the coatings was evaluated by Neutral salt spray (NSS), Electrochemical impedance spectroscopy (EIS) and Tafel polarization. The surface topography of the samples was observed by Scanning Electron Microscopy (SEM). The results indicated that the corroded area of the Mo-HEDP treatment was only corroded 2% after 72 h spraying, while the corrosion behaviour of Mo-HEDP was closed to that of Cr pretreatment due to the synergistic reaction of molybdate and HEDP. Compared with the film of Cr treatment, Mo-HEDP passivating coating was more environmentally friendly.

• Periodical: Advanced Materials Research (Volumes 399-401)
• Pages: 1972-1975
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.399-401.1972
• Online since: November 2011
• Authors: Hui Min Zhang, Lin Wu, Zhao Hui Ouyang, De Lian Yi, Qiao Hua, Mao Sheng Tao, Yue Qin, Dan Li
• Keywords: Corrosion Behavior, EIS, Molybdenum Series Coatings, NSS

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