Process and composition for passivating metal surfaces
a technology of passivating metal and composition, which is applied in the direction of metal material coating process, coating, etc., can solve the problems of affecting the corrosion resistance of galvanized coating, and affecting the appearance of galvanized coating, so as to improve the corrosion resistance, and improve the effect of paint adhesion
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[0075]The following examples are included to more clearly demonstrate the overall nature of the invention. FIGS. 1-3 illustrate the improved results obtained by employing aqueous compositions of this invention. These examples are exemplary, not restrictive, of the invention.
Synthesis of Composition 1
[0076]In the below experiments, a batch of Cr(H2PO4)3 was first synthesized via the combination of the raw materials: (1) CrO3; (2) H3PO4; and (3) H2O2. The final concentration of the master batch was determined to be 43.84% wt. %. This master batch was then combined with the polymer system having carboxylic functional groups, the organo-functional silane, and the organopolyphosphonic acid or salt thereof identified in Table 1 below:
TABLE 1AmountRaw MaterialChemical Name(wt. %)Cr(H2PO4)3Chromium Dihydrogen Phosphate6.8(43.84%)DEQUEST 20101-Hydroxyethylidene-1, 1-diphosphonic4.1acidSOKALAN CP12SAcrylic Acid Copolymer4.6DYNASYLAN3-Aminopropyl-triethoxysilane2.2AMEO A1100DI H20Water82.3
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