Manufacturing Industry
Polymetallosiloxane coatings derived from two-step, acid-base catalyzed sol precursors for corrosion protection of aluminum substrates.
Journal of Coatings Technology, The, November, 1993 by Fair, J.R.; Reed, A.P.; Sugama, T.
INTRODUCTION
Over the last three years, the characteristics of preceramic polymetallosiloxane (PMS) polymers have been investigated for use as corrosion-protective coatings on aluminum (Al) substrates.|1-3~ PMSs were prepared through hydrolysis-polycondensation-pyrolysis synthesis of sol precursor solutions consisting of monomeric organofunctional silane, metal alkoxides, M|(OR).sub.n~, (where M is Ti, Zr, Ge, or Al; R is C|H.sub.3~, |C.sub.2~|H.sub.5~, or |C.sub.3~|H.sub.7~; and n is 2, 3, or 4), methanol, water, and mineral or organic acid as a hydrolysis accelerator. Since a sol is a fluid colloidal solution, the addition of HCl as mineral acid produced a clear sol, thereby helping to form smooth, uniform coatings. The formation of this clear sol was due mainly...
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