| 摘要 |
PCT No. PCT/GB95/02850 Sec. 371 Date Jul. 22, 1997 Sec. 102(e) Date Jul. 22, 1997 PCT Filed Dec. 6, 1995 PCT Pub. No. WO96/17896 PCT Pub. Date Jun. 13, 1996A coating composition containing a tetraalkyl silicate or a monomeric or oligomeric hydrolysis product thereof, present in a proportion of 40-90% by weight on the non-volatile content of the composition, and a hydrous oxide sol selected from Type A sols and Type B sols, present in a concentration such that the said oxide constitutes 10-60% by weight of the non-volatile content of the coating composition; optionally together with a surface wetting agent, marker material, defoamer, stabilizer, corrosion inhibitor and/or a catalyst which assists in chain-extension and cross-linking of the hydrolysis products in the presence of moisture; in dispersion in a fluid aqueous medium which is water optionally containing also from 0.1-40% by volume of polar organic liquid at least partly miscible with water. A method of pretreating a metal workpiece by applying this coating composition to a surface of the workpiece and drying the coating. The product is a metal workpiece carrying a surface coating thus formed. Coated workpieces may be secured together by an adhesive to constitute a structure.
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