abstract |
A heat curable bonding composition of the present invention comprises an aqueous solution containing phosphate ion (PO4-3) and chromium(III) ion (Cr+3, or trivalent chromium) and is substantially free of hexavalent chromium ions. The bonding composition may further contain at least one secondary cationic species. The bonding composition has a pH in the range of about 1 to about 3.5. |