Metal treatment – Process of modifying or maintaining internal physical... – Processes of coating utilizing a reactive composition which...
Patent
1996-12-03
1999-05-18
Simmons, David A.
Metal treatment
Process of modifying or maintaining internal physical...
Processes of coating utilizing a reactive composition which...
148253, 148255, 148260, 148275, C23C22/48
Patent
active
059047844
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a liquid composition, which may be either a working composition suitable for direct use in treating metal (and if so may also be called a "bath" herein below even if not used by immersion) or a concentrate composition suitable for diluting with water and/or mixing with one or more other concentrate compositions to form a working composition, and to a method for treating the surface of aluminiferous metals, which are defined for this purpose to be aluminum and its alloys that contain at least 45% by weight of aluminum. More particularly, this invention relates to a composition and/or method, for treating the surface of aluminiferous metals, that imparts thereto an excellent resistance to blackening by boiling water, an excellent paint adherence, and an excellent lubricity, and which are therefore useful, for example, for creating surface conditions that are highly adapted for aluminum can fabrication.
DESCRIPTION OF RELATED ART
The manufacture of drawn-and-ironed (the phrase "drawn-and-ironed" and any grammatical variations thereof such as "drawing-and-ironing", "draw-and-iron", or the like being hereinafter usually abbreviated "DI") aluminum cans typically performed by a DI process, followed by surface cleaning with an acidic cleaner in order to remove soil commonly called "smut" in the art, the smut being composed of aluminum microparticles, lubricant (coolant), metal soap, and the like, and then by a phosphate conversion coating treatment on the surface, with the goal of improving the corrosion resistance and paint adherence. These conversion coating treatments may be broadly classified into chromate treatments, which produce chromium phosphate coatings, and non-chromate treatments, which usually contain zirconium compounds such as fluozirconic acid and salts thereof and produce composite films of zirconium oxide, zirconium phosphate, and the like.
Cleaning processes using non-chromate conversion reagents have recently come to account for approximately 80% of the cleaning lines in Japan as a consequence of environmental protection issues. After the conversion treatment, conversion-coated aluminum cans are generally subjected to a thorough rinse in a washer and drying in a water-draining oven, and, upon exiting the oven, are transported to a printing or painting process. Upon reaching the printing or painting process, the cans, which during previous process steps are typically running in about five to thirty lines, are passed through a single filer to form a single line for transfer to a special-purpose conveyor. Can transport is impeded at this point by the contact occurring between the cans and guides and between individual cans. The prevailing view is that the reason for this is the relatively high coefficient of static friction of cleaned and conversion-treated aluminum cans. The recent increases in transport rates associated with increases in can manufacturing output have caused a proliferation in the sources of this problem, and the resulting reduction in productivity has become an increasingly serious problem. This has created a strong desire to reduce the coefficient of static friction of the external surfaces of aluminum cans without impairing the corrosion resistance. to aluminum cans and thereby raising the can transport efficiency. In this method, a water-soluble organophosphate ester, water-soluble derivative of a saturated fatty acid, or the like is sprayed onto the can surface between the final deionized water rinse in the can washer line and the draining-drying process. This spraying serves to form a lubricating organic film on the can surface.
However, when a cleaning unit is employed that recycles the deionized water from the final rinse using an active carbon adsorption treatment, components of the coating end up being adsorbed by the active carbon. This has negative economic consequences because it accelerates deterioration of the active carbon and increases chemical consumption. In addition, when the shape of the workpiece is such t
REFERENCES:
patent: 5030323 (1991-07-01), Awad
patent: 5064500 (1991-11-01), Awad
Iino Yasuo
Ikeda Toshihiro
Motozawa Masahiro
Henkel Corporation
Jaeschke Wayne C.
Johnson Lance G.
Koehler Robert R.
Simmons David A.
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