Metal treatment – Process of modifying or maintaining internal physical... – Processes of coating utilizing a reactive composition which...
Patent
1997-04-04
1999-01-26
Simmons, David A.
Metal treatment
Process of modifying or maintaining internal physical...
Processes of coating utilizing a reactive composition which...
118612, 148253, 148261, 148262, C23C 800
Patent
active
058633570
ABSTRACT:
Disclosed is a method for zinc phosphating a molded metal article wherein a treating bath composition comprises from 1.5 to 5.0 g/l of zinc ion, from 0.1 to 3.0 g/l of manganese ion, from 5 to 40 g/l of phosphate ion, from 0.05 to 3.0 g/l of a fluorine compound as HF and hydoxylamine as a chemical conversion accelerator. A concentration of hydroxylamine is maintained to satisfy the following relationship: treating bath is agitated by a vibratory agitating means provided in the treating vessel so that a mean acceleration a of a treating solution present within a bath region in which the molded metal article is immersed to be treated under fluid agitation is at least 8 cm/sec.sup.2. The mean acceleration is calculated from the following equation: ##EQU1## wherein values of X, Y and Z, each in unit of cm/sec.sup.2, indicate average acceleration values of treating solution in three respective X, Y and Z axial directions which are perpendicular to each other. The velocity changes of the treating solution in a flow state in respective X, Y and Z directions are synchronously measured at measuring locations for 60 seconds to be averaged to obtain the respective average acceleration values in X, Y and Z directions.
REFERENCES:
patent: 4529451 (1985-07-01), Otrhalek et al.
Database WPI, Section Ch, Week 7920, Derwent Publications Ltd., London, GB and JP 54 045 639 A, Nov. 1979.
Patent Abstracts of Japa, vol. 016, No. 086 (C-0916), 3 Mar. 1992.
Galvanotechnik, vol. 76, No. 11, 1 Nov. 1985 & SU 1-070 212 A.
Miyamoto Satoshi
Shinomiya Mitsuo
Sobata Tamotsu
Takahashi Masashi
Koehler Robert R.
Nippon Paint Co. Ltd.
Simmons David A.
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