Patent ID: 7422629

Claim:
A nonsludging composition, comprising: water; zinc ions (Zn); phosphate ions (H 3 PO 4 ); nitrate ions (HNO 3 ); and m cations other than zinc and n anions other than phosphate and nitrate, wherein each of m and n independently are zero or a positive integer, and the concentration of zinc in said composition satisfies the following mathematical conditions: { Zn } ≤ 0.3 ⁢ { H 3 ⁢ PO 4 } + 0.5 ⁢ { HNO 3 } - 0.5 ⁢ ∑ i = 0 m ⁢ p i ⁢ C i + 0.5 ⁢ ∑ j = 0 n ⁢ q j ⁢ A j ; and { Zn } ≥ 0.27 ⁢ { H 3 ⁢ PO 4 } + 0.45 ⁢ { HNO 3 } - 0.45 ⁢ ∑ i = 0 m ⁢ p i ⁢ C i + 0.45 ⁢ ∑ j = 0 n ⁢ q j ⁢ A j . wherein: all concentrations are in mol/L; A 0 and C 0 are 0; p i is the valence of cations other than zinc; and q j is the valence of anions other than phosphate and nitrate.