Compositions: coating or plastic – Coating or plastic compositions – Corrosion inhibiting coating composition
Patent
1996-01-05
1997-02-18
Green, Anthony
Compositions: coating or plastic
Coating or plastic compositions
Corrosion inhibiting coating composition
106 1441, 148247, 148253, 148259, 148275, 148277, C09D 500, C23C 2205
Patent
active
056037546
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a novel composition, usually called a "bath" hereinafter for brevity, and process that can be used to treat the surface of both aluminum DI cans and tinplate DI cans and that impart an excellent corrosion resistance and paint adherence to the surface of these cans prior to painting and/or printing them. "Aluminum DI cans" and "tinplate DI cans" refer to cans fabricated by the drawing and ironing, also called draw-ironing, of aluminum sheet and tinplated steel sheet respectively.
BACKGROUND ART
Aluminum DI cans and tinplate DI cans have heretofore been treated with separate special purpose surface treatment baths. Baths for treating the surface of aluminum DI cans are exemplified by the bath taught in Japanese Laid Open [Kokai or Unexamined] Patent Application Number Sho 52-131937 [131,937/1977]. The surface treatment bath taught therein is an acidic aqueous coating solution that has a pH of approximately 1.0 to 4.0 and that contains phosphate, fluoride, and zirconium and/or titanium. Treatment with this conversion treatment bath results in the formation of a highly paint-adherent, highly corrosion-resistant conversion film on the aluminum surface. The main components of this film are phosphate salt and zirconium oxide or titanium oxide.
Baths for treating the surface of tinplate DI cans are exemplified by the bath taught in Japanese Laid Open Patent Application Number Hei 1-100281 [100,281/1989]. This invention comprises a conversion film-forming bath for the treatment of metal surfaces. The bath in this case has a pH of 2 to 6 and contains I to 50 g/L of phosphate ions, 0.2 to 20.0 g/L of oxyacid ions, 0.01 to 5.0 g/L of tin ions, and 0.01 to 5.0 g/L of condensed phosphate ions. Treatment with this conversion treatment bath results in the formation of a highly corrosion-resistant film on the surface of tinplate DI cans. The main component of this film is tin phosphate.
A device known as a washer is generally used to treat the surface of DI cans. The formed DI cans are continuously treated with a degreasing composition and a conversion coating composition while turned upside down. Washers currently in use most often execute the following 6 processes: preliminary degreasing, degreasing, water wash, surface treatment, water wash, and a wash with de-ionized water.
In order to conduct surface treatment using such a washer, it has been necessary to select a surface treatment bath adapted to the type of DI cans to be treated. In other words, a treatment bath in accordance with, for example, the invention in Japanese Laid Open Patent Application Number Sho 52-131937 would be used as the surface treatment bath for aluminum DI cans, while a treatment bath in accordance with, for example, Japanese Laid Open Patent Application Number Hei 1-100281 would be used as the treatment bath for tinplate DI
DISCLOSURE OF THE INVENTION
Problems to Be Solved by the Invention
Accompanying recent increases in the diversity of DI cans fabrication, there has been increasing opportunity to collect aluminum DI cans and tinplate DI cans into respective lots of some size and treat these in a single washer in an alternating sequence. However, a high-quality film with good corrosion resistance is not produced when the treatment bath in accordance with Japanese Laid Open Patent Application Number Sho 52-131937 is also applied to tinplate DI cans. On the other hand, a conversion film is not formed when the treatment bath of Japanese Laid Open Patent Application Number Hei 1-100281 is also applied to aluminum DI cans; this results in a poor corrosion resistance and a poor paint film adherence. As a result, each time the treatment substrate changes, it has been necessary to discard the treatment bath, clean the treatment chamber itself, and install a freshly prepared treatment bath that corresponds to the type of substrate.
In view of the circumstances described above, this invention takes as its object the provision of a multipurpose treatment bath and treatment process wherein a single trea
REFERENCES:
patent: 4332646 (1982-06-01), Tsurumaru et al.
patent: 4992115 (1991-02-01), Ikeda
patent: 4992116 (1991-02-01), Hallman
Aoki Tomoyuki
Shimizu Akio
Yoshida Masayuki
Green Anthony
Henkel Corporation
Jaeschke Wayne C.
Jaeschke, Jr. Wayne C.
Wisdom, Jr. Norvell E.
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