Metal treatment – Process of modifying or maintaining internal physical... – Processes of coating utilizing a reactive composition which...
Patent
1992-04-30
1994-08-09
Kastler, Scott
Metal treatment
Process of modifying or maintaining internal physical...
Processes of coating utilizing a reactive composition which...
148270, C23C 2286
Patent
active
053363361
ABSTRACT:
A process for a chemical treatment with a phosphate by bringing a steel material into contact with a phosphate chemical treatment bath maintained at 40.degree. C. or less and containing a phosphate ion, a nitrate ion, a chemical film formable metal ion and an oxidizing agent, to cause a film formation reaction between the phosphate chemical treatment bath and the steel material, whereby a phosphate chemical film is formed on the surface of the steel, wherein a circulation path for withdrawing a portion of the phosphate chemical treatment bath and returning the withdrawn phosphate chemical treatment bath to the bath is provided, and a filter comprising an inorganic material composed of SiO.sub.2 and Al.sub.2 O.sub.3 is provided in the circulation path, of which filter not only enables sludge from the phosphate chemical treating solution to be physically removed but also prevents changes the chemical structure in the form of a solution.
REFERENCES:
The Condensed Chemical Dictionary, 3rd Ed. pp. 232-233 Jun. 2, 1944.
Patent Abstracts of Japan, vol. 21, No. 44 (C-29), 30 Nov. 1978.
Patent Abstracts of Japan, vol. 10, No. 239 (C-367) (2295) 19 Aug. 1986.
Kastler Scott
Nippondenso Co. Ltd.
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