Universal aqueous coating compositions for pretreating metal surfaces
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C23C-022/07
C09D-005/08
C23F-011/167
출원번호
US-0153022
(2002-05-22)
발명자
/ 주소
Claffey, William J.
McIntyre, John F.
Beck, Leslie M.
출원인 / 주소
PPG Industries Ohio, Inc.
대리인 / 주소
Uhl William J.
인용정보
피인용 횟수 :
25인용 특허 :
12
초록▼
A universal aqueous composition and a process for using such a composition for pretreating metal substrates is provided. The aqueous composition includes a hydroxy functional cyclic compound, such as a tannin, in an amount of at least about 500 ppm, phosphate ions, an oxidizer-accelerator, and at le
A universal aqueous composition and a process for using such a composition for pretreating metal substrates is provided. The aqueous composition includes a hydroxy functional cyclic compound, such as a tannin, in an amount of at least about 500 ppm, phosphate ions, an oxidizer-accelerator, and at least one Group IVB metal compound capable of converting to a metal oxide upon application to the metal substrate, such as a fluorozirconate or fluorotitanate. The composition may further contain fluoride ions and/or iron. The composition is particularly useful for corrosion resistance with a variety of metals such as iron, steel, zinc-coated surfaces, aluminum, and alloys thereof. A disaccharide may further be provided to prolong the useful life of the composition, particularly when used in spray applications.
대표청구항▼
1. An aqueous composition for pretreating metal substrates comprising:a) at least one hydroxy functional cyclic compound present in an amount of at least about 500 ppm, said hydroxy functional cyclic compound selected from the group consisting of polyhydroxy phenolic compounds and heterocyclic nitro
1. An aqueous composition for pretreating metal substrates comprising:a) at least one hydroxy functional cyclic compound present in an amount of at least about 500 ppm, said hydroxy functional cyclic compound selected from the group consisting of polyhydroxy phenolic compounds and heterocyclic nitrogen-containing compounds having hydroxy functionality;b) phosphate ions;c) at least one oxidizer-accelerator;d) at least one Group IVB metal compound capable of converting to a metal oxide upon application to the metal substrate;e) at least one disaccharide; andf) water. 2. The composition of claim 1 wherein the hydroxy functional cyclic compound is selected from the group consisting of catechol, methylene-bridged poly(alkylphenols), coumaryl alcohol, coniferyl alcohol, hydroxyalkyl celluloses, lignin, tannin, sinapyl alcohol, and mixtures thereof. 3. The composition of claim 1 wherein the hydroxy functional cyclic compound is at least one tannin material. 4. The composition of claim 3 wherein the tannin material is selected from the group consisting of vegetable tannin, hydrolyzable tannin, condensable tannin, tannic acid, and mixtures thereof. 5. The composition of claim 4 wherein the tannin material is at least one of quebracho and mimosa tannins. 6. The composition of claim 1 wherein said hydroxy functional cyclic compound is present in an amount of about 500 ppm to about 2,500 ppm. 7. The composition of claim 1 wherein said phosphate ions are present in an amount of about 125 to about 300 ppm. 8. The composition of claim 1 wherein said oxidizer accelerator is present in an amount of about 10 to about 10,000 ppm. 9. The composition of claim 1 wherein said Group IVB metal compound is present in an amount of about 60 to about 600 ppm. 10. The composition of claim 1, having a pH within the range of about 3.5 to about 5. 11. The composition of claim 1 wherein said Group IVB metal compound is selected from the group consisting of hexafluorozirconic acid and hexafluorotitanic acid and their soluble salts. 12. The composition of claim 1, wherein said oxidizer-accelerator is selected from the group consisting of alkali metal chlorate, alkali metal bromate, alkali metal perchlorate, alkali metal chlorite, alkali metal nitrate, alkali metal nitrite, alkali metal perborate, ammonium chlorate, ammonium bromate, ammonium perchlorate, ammonium chlorite, ammonium nitrate, ammonium nitrite, ammonium perborate and mixtures thereof. 13. The composition of claim 1, wherein said oxidizer-accelerator is selected from the group consisting of halo-substituted benzene sulfonic acid, alkali metal salt of halo-substituted benzene sulfonic acid, ammonium salt of halo-substituted benzene sulfonic acid, nitro-substituted benzene sulfonic acid and ammonium salt of nitro-substituted benzene sulfonic acid. 14. The composition of claim 1, wherein said oxidizer-accelator comprises a mixture of an alkali metal salt of meta-nitrobenzene sulfonic acid and at least one alkali metal salt selected from the group consisting of alkali metal chlorate and alkali metal nitrate. 15. The composition of claim 1, wherein the disaccharide is selected from the group consisting of lactose and sucrose. 16. The composition of claim 1, wherein the disaccharide is present in an amount of 500 to 10,000 ppm. 17. A process for pretreating a metal substrate comprising contacting the substrate with an aqueous composition which comprises:a) at least one hydroxy functional cyclic compound present in an amount of at least about 500 ppm, said hydroxy functional cyclic compound selected from the group consisting of hydroxy phenolic compounds and heterocyclic nitrogen-containing compounds having hydroxy functionality;b) phosphate ions;c) at least one oxidizer-accelerator;d) at least one Group IVB metal compound capable of converting to a metal oxide upon application to the metal substrate;e) at least one disaccharide; andf) water. 18. The process of claim 17 wherein the metal substrate is sele cted from the group consisting of cold rolled steel, steel surface-treated with any of zinc metal, zinc compounds and zinc alloys; aluminum; aluminum alloys; zinc-aluminum alloys; aluminum plated steel; and aluminum alloy plated steel. 19. The process of claim 17 wherein the metal substrate is a combination of two or more metal substrates assembled together. 20. The process of claim 17 wherein the metal substrate is contacted with the aqueous composition by immersion. 21. The process of claim 17 wherein the metal substrate is contacted with the aqueous composition by spray application. 22. The process of claim 17 wherein the at least one disaccharide is selected from the group consisting of lactose and sucrose. 23. The process of claim 17 wherein the aqueous composition is at ambient temperature. 24. The process of claim 17 further comprising the step of rinsing the metal substrate with an aqueous solution containing silane after contact with the aqueous composition.
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