US4613450A
Expired / Lapsed
US
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Anticorrosion means and compositions containing same
Assignee: Union Chimique et Industrielle de L'ouest SA
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Filing: 1985-03-25
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Granted: 1986-09-23
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Expires: 2005-03-25
Abstract
Abstract This invention relates to a corrosion inhibitor for protecting metallic surfaces which are in contact with water, in particular circuits, apparatus and devices which use water as energetic or thermic fluid, said corrosion inhibitor being a fluorophosphate compound selected from the group consisting of: (i) compound of the formula M 2 I PO 3 F, xH 2 O (ii) compound of the formula LiM I PO 3 F, xH 2 O (iii) compound of the formula NaM I PO 3 F, xH 2 O (iv) compound of the formula M II PO 3 F, xH 2 O (v) compound of the formula M 2 I M II (PO 3 F) 2 , xH 2 O (vi) compound of the formula M I PO 2 F 2 , xH 2 O (vii) compound of the formula M II (PO 2 F 2 ) 2 , x H 2 O (wherein M I is Na, K, Rb, Cs or HN 4 ; M II is Mg, Ca, Ba, Sr, Zn, Cd, Mn, Ni or Co; and x is an integer or a fractional number comprised between 0 and 6) and (viii) mixtures thereof.
Inventors
- 👤 Francis Moran
- 👤 Sylvain Rocher
- 👤 Louis Cot
- 👤 Francis Dabosi
- 👤 Michel Duprat
- 👤 Jean Durand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:03
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/14; C23F11/141; C23F11/167; C23F11/1676; C23F11/18; C23F11/184
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
195 words
A method for protecting metallic surfaces which are in contact with a corrosive aqueous energic or thermic fluid and tend to be corroded thereby which comprises incorporating in said fluid between 3 and 500 ppm by weight of a fluorophosphate compound corrosive inhibitor selected from the group consisting of: (i) compound of the formula M 2 I PO 3 F, xH 2 O (ii) compound of the formula LiM I PO 3 F, xH 2 O (iii) compound of the formula NaM I PO 3 F, xH 2 O (iv) compound of the formula M II PO 3 F, xH 2 O (v) compound of the formula M 2 I M II (PO 3 F) 2 , xH 2 O (vi) compound of the formula M I PO 2 F 2 , xH 2 O (vii) compound of the formula M II (PO 2 F 2 ) 2 , xH 2 O and (viii) mixtures thereof ;wherein M I is Na, K, Rb, Cs or HN 4 ; M II is Mg, Ca, Ba, Sr, Zn, Cd, Mn, Ni or Co; and x is an integer or a fractional number comprised between 0 and 6.
Claim 2
Independent Claim
195 words
A method for protecting metallic surfaces which are in contact with a corrosive aqueous energic or thermic fluid and tend to be corroded thereby which comprises incorporating in said fluid between 3 and 500 ppm by weight of a fluorophosphate compound corrosive inhibitor selected from the group consisting of: (i) compound of the formula M 2 I PO 3 F, xH 2 O (ii) compound of the formula LiM I PO 3 F, xH 2 O (iii) compound of the formula NaM I PO 3 F, xH 2 O (iv) compound of the formula M II PO 3 F, xH 2 O (v) compound of the formula M 2 I M II (PO 3 F) 2 , xH 2 O (vi) compound of the formula M I PO 2 F 2 , xH 2 O (vii) compound of the formula M II (PO 2 F 2 ) 2 , xH 2 O and (viii) mixtures thereof ;wherein M I is Na, K, Rb, Cs or HN 4 ; M II is Mg, Ca, Ba, Sr, Zn, Cd, Mn, Ni or Co; and x is an integer or a fractional number comprised between 0 and 6.
Claim 3
Dependent Claim
14 words
A method according to claim 1 in which the corrosion inhibitor is zinc fluorophosphate.
Claim 4
Dependent Claim
14 words
A method according to claim 1 in which the corrosion inhibitor is potassium fluorophosphate.
Claim 5
Dependent Claim
48 words
A method according to claim 1 in which said corrosive fluid also contains a substance (B) selected from the group consisting of polyamines, organic polyelectrolytes resulting from polymerization and copolymeriation of a monomer having a C═C double bond, alkylenephosphonic acid derivatives, aminoalkylene phosphonic acid derivatives and mixtures thereof.
Claim 6
Dependent Claim
26 words
A method according to claim 4 in which there is from 1-100 parts dry weight of substance (B) per from 1-15 parts dry weight of fluorophosphate.
Claim 7
Dependent Claim
24 words
A method according to claim 1 in which the corrosive fluid contains zinc fluorophosphate in an amount between 5 and 200 ppm by weight.
References Cited (Backward Citations)
FR10485E
Cited
US4132572A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1989-09-22 | 1990-03-24 | 1990-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-22 | 1994-03-24 | 1994-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-22 | 1998-03-24 | 1998-09-23 | $7700.00 | Window Closed / Lapsed |