Patent US4053329A successfully refreshed from Google Patents.
US4053329A
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US
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Method of improving corrosion resistance of metal substrates by passivating with an onium salt-containing material
Assignee: PPG Industries Inc
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Filing: 1976-04-02
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Granted: 1977-10-11
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Expires: 1996-04-02
Abstract
Abstract A method of providing improved corrosion resistance to coated metal substrates is disclosed. The process of the invention involves a passivating pretreatment with an onium salt before coating. The invention is particularly effective with ferrous metal substrates.
Inventors
- 👤 Nicholas T. Castellucci
- 👤 Joseph F. Bosso
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:18
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/82; C23C22/83; C23C22/05; C23C22/68; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
95 words
A method of providing improved corrosion resistance to ferrous metal substrates, comprising: (a) passivating the surface of the substrate by pretreatment with an at least 3 percent by weight dispersion or solution in a compatible vehicle of an onium salt selected from the class consisting of: (R).sub.4 N.sup.⊕ A.sup.⊖ , (R).sub.4 P.sup.+A.sup.-, (R).sub.3 S.sup.+A.sup.- where R are organic radicals and A is an anion of a weak acid which will not detrimentally attack the surface of the ferrous substrate, followed by (b) directly coating the pretreated metal surface with an adhesive or protective coating material.
Claim 2
Independent Claim
95 words
A method of providing improved corrosion resistance to ferrous metal substrates, comprising: (a) passivating the surface of the substrate by pretreatment with an at least 3 percent by weight dispersion or solution in a compatible vehicle of an onium salt selected from the class consisting of: (R).sub.4 N.sup.⊕ A.sup.⊖ , (R).sub.4 P.sup.+A.sup.-, (R).sub.3 S.sup.+A.sup.- where R are organic radicals and A is an anion of a weak acid which will not detrimentally attack the surface of the ferrous substrate, followed by (b) directly coating the pretreated metal surface with an adhesive or protective coating material.
Claim 3
Dependent Claim
26 words
The method of Claim 1 in which the onium salt is selected from the class consisting of (R) 4 N.sup.⊕ A.sup.⊖ and (R) 4 p.sup.⊕ a.sup.⊖
Claim 4
Dependent Claim
24 words
The method of claim 1 in which the anion is selected from the class consisting of formate, acetate, propionate, lactate, borate, carbonate and hydroxyl.
Claim 5
Dependent Claim
12 words
The method of claim 1 in which the onium salt is polymeric.
Claim 6
Dependent Claim
12 words
The method of claim 4 in which the polymer is a polyepoxide.
Claim 7
Dependent Claim
22 words
The method of claim 5 in which the onium salt is a quaternary ammonium salt of a polyglycidyl ether of a polyphenol.
Claim 8
Dependent Claim
12 words
The method of claim 1 in which the onium salt is monomeric.
Claim 9
Dependent Claim
14 words
The method of claim 7 in which the onium salt is a phosphonium salt.
Claim 10
Dependent Claim
25 words
The method of claim 8 in which the phosphonium salt is selected from the class consisting of ethyl triphenyl phosphonium acetate and tetrabutyl phosphonium acetate.
Claim 11
Dependent Claim
15 words
The method of claim 1 in which the onium salt is in an aqueous medium.
Claim 12
Dependent Claim
16 words
The method of claim 10 in which the aqueous medium contains at least 75 percent water.
Claim 13
Dependent Claim
32 words
The method of claim 10 in which the metal substrate is first immersed in an aqueous composition of the onium salt, removed therefrom, optionally rinsed with deionized water, dried and subsequently coated.
Claim 14
Dependent Claim
10 words
A metal article coated by the method of claim 1.
Claim 15
Dependent Claim
10 words
A metal article coated by the method of claim 17.
Claim 16
Dependent Claim
18 words
The method of claim 1 in which the ferrous metal substrate is iron phosphated before the passivating pretreatment.
Claim 17
Dependent Claim
10 words
A metal article coated by the method of claim 15.
Claim 18
Dependent Claim
17 words
The method of claim 1 in which the metal substrate is zinc phosphated before the passivating pretreatment.
Claim 19
Dependent Claim
10 words
A metal article coated by the method of claim 1.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-10 | 1981-04-11 | 1981-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-10 | 1985-04-11 | 1985-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-10 | 1989-04-11 | 1989-10-11 | $7700.00 | Window Closed / Lapsed |