Patent ID: 7993438

Claim:
An aqueous bonding solution prepared by a process comprising: (i) combining water, phosphoric acid, a source of magnesium ions, and optionally a source of borate ions to form a buffered binder solution; (ii) adding to the buffered binder solution a leachable corrosion inhibitor in an amount of from about 2 to about 15 g per 100 ml, wherein the leachable corrosion inhibitor is selected from the group consisting of zinc aluminum orthophosphate, zinc aluminum tripolyphosphate, aluminum tripolyphosphate, zinc aluminum polyphosphate, strontium aluminum polyphosphate, modified strontium aluminum polyphosphate, modified zinc calcium polyphosphate, zinc molybdate phosphate, and combinations thereof; wherein the bonding solution has a pH from about 2 to about 4.5 and is substantially free of zinc ions and aluminum ions in excess of quantities present from the leachable corrosion inhibitor.