Method for producing an amorphous, light weight calcium phosphat

Details Method for producing an amorphous, light weight calcium phosphat Method for producing an amorphous, light weight calcium phosphat

1977-01-31

1978-08-22

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

148 315, 148 616, C23F 710

Patent

active

041086902

ABSTRACT:
A method is disclosed for producing a non-crystalline, light weight tightly adherent coating of calcium phosphate on ferrous metal surfaces. In this method, the ferrous metal surface is treated with a coating solution containing calcium phosphate together with an oxidizing agent at a pH which closely approaches but does not exceed the saturation point of the calcium phosphate in solution. In practicing the method of this invention, the calcium phosphate content of the coating bath is preselected from the range of from about 0.01 to about 1.0 moles per liter as measured by the Ca.sup.++ cation. Next, a bath temperature of from about 50.degree. F. to about 160.degree. F. is selected. The pH of the bath is raised to a pH approaching but not exceeding the saturation point of calcium phosphate at the selected temperature and the bath is brought to the selected temperature.
Coating of the ferrous metal with the calcium phosphate solution is accomplished by conventional dip or spray methods. The resultant coating, though amorphous and with very low coating weight, provides the same superior bonding characteristics associated with heavier and crystalline prior art phosphate coating materials.

REFERENCES:
patent: 3729346 (1973-04-01), Gotta
patent: 3810792 (1974-05-01), Ries
Satyanandham, Metal Finishing, Sep. 1968, pp. 52, 53, 58.
Wiederholt, The Chemical Surface Treatment of Metals, 1965, Robert Draper Ltd. p. 107.

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