Metal treatment – Process of modifying or maintaining internal physical... – Processes of coating utilizing a reactive composition which...
Patent
1996-10-15
1998-03-31
Silverberg, Sam
Metal treatment
Process of modifying or maintaining internal physical...
Processes of coating utilizing a reactive composition which...
148259, 148260, 106 1415, 106 1412, 106 1421, C23C 2200, C23F 1110
Patent
active
057333866
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a novel polymer composition and method for treating metal surfaces for the purpose of imparting an excellent corrosion resistance, paint adherence, and lubricity to such surfaces prior to the painting or working thereof. This invention is applied with particularly good effect to the treatment of metals prior to their painting or working.
RELATED ART
Phosphating is often used to treat metals prior to painting. Phosphating is carried out by treating the metal surface with an acidic aqueous solution whose base components are phosphoric acid and metal ions. An increase in pH is generated at the interface when the metal surface is etched by the acid, and this causes the precipitation of phosphate crystals (zinc phosphate, iron phosphate, and the like) on the metal surface in the form of a coating. The corrosion resistance and paint adherence of metal surfaces are substantially improved by the presence of this phosphate coating. This metal surface treatment is in wide use even at present. However, while phosphating does yield an improved corrosion resistance and paint adherence, the films produced by this method do not by themselves afford acceptable improvements in lubricity.
As a result, the treatment of metals prior to working, and particularly prior to plastic working, generally consists of a process in which phosphating is combined with a lubrication treatment. When, for example, only oil lubrication is used in the severe working process of cold forging, seizure occurs rather readily due to the large metal-to-metal contact area. To counter this, the surface of the metal is first coated with a phosphate film and a solid lubricant, such as a soap (including metal soap) or molybdenum disulfide, is then applied in order to form a lubricating film in the upper region of the phosphate film. This prior art process is thus a two-step process. Given the strong contemporary demands for resource conservation, energy conservation, and simplification of production processes, it is desired to provide a surface treatment agent that can be applied in a one-step treatment and will still yield a better property package than the prior art process.
The use of water-soluble resins in metal surface treatments whose goal is to provide metal surfaces with cortesion resistance and paint adherence is
In these prior art methods the metal surface is treated with an aqueous solution containing the derivative of a polyhydric phenol compound. However, the formation of an acceptably stable coating on metal surfaces is highly problematic with these prior art methods, and they also do not provide a satisfactory performance (cortesion resistance). Japanese Patent polyhydric phenol derivatives, but even the application of this method does not result in an acceptable adherence by the treated metal surface for some paints.
The present invention seeks to solve the problems described above for the prior art. In specific terms, this invention introduces a polymer composition and method for treating metal surfaces that are able to impart thereto an excellent corrosion resistance, paint adherence, and lubricity.
SUMMARY OF THE INVENTION
It has been discovered that highly corrosion-resistant, paint-adherent, and lubricating films could be formed through the use of a polymer composition containing water-soluble polymer with a special chemical structure. It was found that these highly desirable coatings could be formed by treating the metal surface with a surface treatment bath comprising an acidic aqueous solution containing said polymer composition. The present invention was developed based on these discoveries.
The polymer composition according to the present invention for treating metal surfaces comprises, preferably consists essentially of, or more preferably consists of water, an acidic compound, and polymer molecules corresponding to the following general formula (I): ##STR4## in which (i) the X bonded to the phenyl ring in formula (I) represents (i.1) a hydrogen atom, (i.2) a hydroxyl group, (i.3
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Miyafuji Kazutomo
Tanaka Shigeo
Yoshida Masayuki
Henkel Corporation
Jaeschke Wayne C.
Silverberg Sam
Szoke Ernest G.
Wisdom, Jr. Norvell E.
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