US4000012A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anticorrosive coating of steel
Assignee: FMC Corp
•
Filing: 1974-09-27
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Granted: 1976-12-28
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Expires: 1994-09-27
Abstract
Abstract The corrosion protecting action of iron phosphate or zinc phosphate coatings on mild steel is markedly raised by treating with solutions of α-aminophosphonic or -phosphonous acids or their water soluble salts. Compounds having more than one amino and more than one phosphonic or phosphonous acid groups are also suitable. Paint films on metal surfaces pretreated in this manner show a considerably better adhesion than on untreated surfaces.
Inventors
- 👤 John Burrows
- 👤 James Roger Hargreaves
- 👤 Peter Miles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:06
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/167; C23F11/1676; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/3804; C07F9/3808; C07F9/383; C07F9/48; C07F9/4808; C07F9/4816; C23C; C23C22/00; C23C22/82; C23C22/83
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
189 words
A method of treating phosphated mild steel, said method consisting essentially of a. contacting the mild steel with an aqueous solution of a compound of the formula: ##STR28## in which R 1 is an aryl or substituted aryl grouping containing from 6 to 20 carbon atoms or an alkyl grouping containing up to 6 carbon atoms, R 2 is hydrogen or R 1 and R 2 together with the carbon atoms to which they are attached form a six-membered alicyclic ring, R 3 is hydrogen or an acyl grouping containing 2 or 3 carbon atoms and R 4 is a straight or branched alkyl grouping containing up to 20 carbon atoms, cycloalkyl containing 5 or 6 carbon atoms, or aralkyl or substituted aralkyl grouping or an aralkylene phosphonic acid grouping containing up to 20 carbon atoms, A is a saturated divalent alkylene radical containing up to 6 carbon atoms, X is a phosphonic or phosphonous acid grouping and m is 0, 1 or 2 and n is 0 or 1; or a water-soluble salt thereof, to form a sealing coating on the steel, and b. drying the coated steel.
Claim 2
Independent Claim
189 words
A method of treating phosphated mild steel, said method consisting essentially of a. contacting the mild steel with an aqueous solution of a compound of the formula: ##STR28## in which R 1 is an aryl or substituted aryl grouping containing from 6 to 20 carbon atoms or an alkyl grouping containing up to 6 carbon atoms, R 2 is hydrogen or R 1 and R 2 together with the carbon atoms to which they are attached form a six-membered alicyclic ring, R 3 is hydrogen or an acyl grouping containing 2 or 3 carbon atoms and R 4 is a straight or branched alkyl grouping containing up to 20 carbon atoms, cycloalkyl containing 5 or 6 carbon atoms, or aralkyl or substituted aralkyl grouping or an aralkylene phosphonic acid grouping containing up to 20 carbon atoms, A is a saturated divalent alkylene radical containing up to 6 carbon atoms, X is a phosphonic or phosphonous acid grouping and m is 0, 1 or 2 and n is 0 or 1; or a water-soluble salt thereof, to form a sealing coating on the steel, and b. drying the coated steel.
Claim 3
Dependent Claim
17 words
A method according to claim 1 in which the grouping A contains 1 or 2 carbon atoms.
Claim 4
Dependent Claim
24 words
A method according to claim 1 in which R 1 is an aryl or substituted aryl grouping containing from 6 to 8 carbon atoms.
Claim 5
Dependent Claim
29 words
A method according to claim 1 in which R 4 is an aralkyl or substituted aralkyl grouping or an aralkylene phosphonic acid grouping containing 7 or 8 carbon atoms.
Claim 6
Dependent Claim
21 words
A method according to claim 1 in which R 4 is an alkyl grouping containing from 1 to 18 carbon atoms.
Claim 7
Dependent Claim
14 words
A method according to claim 1 in which R 4 is a cyclohexyl grouping.
Claim 8
Dependent Claim
21 words
A method according to claim 1 in which the metal is immersed in a solution of a compound of formula I.
Claim 9
Dependent Claim
24 words
A method according to claim 1 in which a solution of a compound of formula I is painted or sprayed onto the metal surface.
Claim 10
Dependent Claim
10 words
Phosphated mild steel treated by the method of claim 1.
Claim 11
Dependent Claim
15 words
A method according to claim 1 in which the coated and dried steel is painted.
References Cited (Backward Citations)
US3202534A
Cited
US3200004A
Cited
GB1230121A
Cited
FR1570819A
Cited
US3483133A
Cited
US3634146A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-12-28 | 1980-06-28 | 1980-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-28 | 1984-06-28 | 1984-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-28 | 1988-06-28 | 1988-12-28 | $7700.00 | Window Closed / Lapsed |