Development of Heteropolysiloxane Coatings on Electrogalvanized Steel

The development of heteropolysiloxane coatings on electrogalvanized steel by sol-gel processing has been studied from the sol state to the solid state using techniques such as 29Si NMR, SIMS, XPS, and the three point flexure test. It was possible, from the results obtained, to propose a simplified model for the coatings which brings into play two layers of differing molecular structure: an extremelly thin internal layer and an outer layer, respectively called the anchoring and volume layers.     

Arsen, Antimon, Zinn, Wismut, Zink

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Heteropolysiloxane Coatings on Electrogalvanized Steel: Elaboration and Characterization

Heteropolysiloxane coatings were deposited on an electrogalvanized steel substrate by the dip-coating sol-gel technique. Different coating sols using two precursors, aminopropyltriethoxysilane and methyltriethoxysilane, diluted in a water/ethanol mixture with or without the presence of catalyst, were prepared. Thus, coatings incorporating into their structure, both amine and methyl groups of hydrophilic and hydrophobic character, respectively, were obtained.The characterization of the coatings was monitored at the various stages from the sol state to the solid state using several techniques, namely 29Si NMR, SEM, EMPA, XPS, FTIR and Raman spectroscopies, and the mechanical three-point flexure test. The capability of heteropolysiloxane coatings to protect the electrogalvanized steel substrate against humid corrosion and to act as an adhesion promoter has been investigated.