Ronald W Zurilla

46816410, Jul 21, 1987

May 16, 1985

6/735286

Ronald W. Zurilla - Farmington Hills MI
John Huff - Detroit MI

Ford Motor Company - Dearborn MI

C23C 2212
C23C 2213

148 615Z

A method for increasing the resistance to alkaline dissolution of a phosphate conversion coating on a corrodible metal surface by an improved zinc phosphate conversion coating together with articles coated by this method are disclosed. The substrate is exposed to the phosphating solution by spraying or immersion to chemically effect a reaction with the substrate. First divalent metal cations are selected from magnesium and transition metals having a hydroxide with lower solubility in alkaline solution than zinc hydroxide. The other source of necessary metal cations is zinc and its cations are herein termed second divalent metal cations. In the preferred embodiment, the first divalent metal cations comprise about 84 to about 94 mole percent of the total first and second divalent metal cations in the bath. The deposited coating has first divalent metal cations (chemically combined with phosphate ions) present in an amount of at least 15 mole percent of the total first and second divalent metal cations in the coating.

47131217, Dec 15, 1987

Jan 20, 1987

7/005180

Ronald W. Zurilla - Farmington Hills MI
John Huff - Detroit MI

Parker Chemical Company - Madison Heights MI

C23C 206

4284723

A method for increasing the resistance to alkaline dissolution of a phosphate conversion coating on a corrodible metal surface by an improved zinc phosphate conversion coating together with articles coated by this method are disclosed. The substrate is exposed to the phosphating solution by spraying or immersion to chemically effect a reaction with the substrate. First divalent metal cations are selected from magnesium and transition metals having a hydroxide with lower solubility in alkaline solution than zinc hydroxide. The other source of necessary metal cations is zinc and its cations are herein termed second divalent metal cations. In the preferred embodiment, the first divalent metal cations comprise about 84 to about 94 mole percent of the total first and second divalent metal cations in the bath. The deposited coating has first divalent metal cations (chemically combined with phosphate ions) present in an amount of at least 15 mole percent of the total first and second divalent metal cations in the coating.

45966079, Jun 24, 1986

Jul 1, 1985

6/750456

John Huff - Detroit MI
Ronald W. Zurilla - Farmington Hills MI

Ford Motor Company - Dearborn MI

C23C 2218

148 615Z

A zinc phosphate coating bath and its application to metal is disclosed characterized in that the bath contains 80 to 94, preferably 84 to 94, mole percent nickel cations, 0. 5 to 10 mole percent manganese cations and 5. 5 to 19. 5 mole percent zinc cations together with solubilizing amounts of phosphate ions or phosphate ions in combination with ions of acids other than phosphoric acid.

47227532, Feb 2, 1988

Jan 20, 1987

7/005185

Ronald W. Zurilla - Farmington Hills MI
John Huff - Detroit MI

Parker Chemical Company - Madison Heights MI

C23C 2212

4284723

A method for increasing the resistance to alkaline dissolution of a phosphate conversion coating on a corrodible metal surface by an improved zinc phosphate conversion coating together with articles coated by this method are disclosed. The substrate is exposed to the phosphating solution by spraying or immersion to chemically effect a reaction with the substrate. First divalent metal cations are selected from magnesium and transition metals having a hydroxide with lower solubility in alkaline solution than zinc hydroxide. The other source of necessary metal cations is zinc and its cations are herein termed second divalent metal cations. In the preferred embodiment, the first divalent metal cations comprise aobut 84 to about 94 mole percent of the total first and second divalent metal cations in the bath. The deposited coating has first divalent metal cations (chemically combined with phosphate ions) present in an amount of at least 15 mole percent of the total first and second divalent metal cations in the coating.