| 摘要 |
<p>PCT No. PCT/FR95/00432 Sec. 371 Date Nov. 30, 1995 Sec. 102(e) Date Nov. 30, 1995 PCT Filed Apr. 5, 1995 PCT Pub. No. WO95/26934 PCT Pub. Date Oct. 12, 1995A material is impregnated with an aqueous solution containing precursors of a glass-containing phosphate base modified at least by the presence of zinc oxide, then dried and heat treated to form an internal oxidation protection constituted by the modified phosphate glass-containing base. The precursors are introduced into the aqueous solution so as to form a glass-containing base in which the molar ratio between the glass modifying oxides, comprising zinc oxide, and the glass forming oxides, principally comprising or consisting of phosphoric anhydride, is sufficiently high, in particular at least 0.6, preferably 0.9, to confer a resistance to corrosion by moisture on the glass-containing phosphate base. The solution is formed by first dissolving in water, a polyphosphate such as sodium metaphosphate or trimetaphosphate which can allow the subsequent dissolution, by stable complexing without forming a precipitate, of the required quantity of precursor salts for the modifying oxides comprising at least one zinc salt such as zinc nitrate or sulfate.</p> |
