US4074013A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrodible iron-containing surfaces carrying corrosion-inhibiting coating
Assignee: Henkel AG and Co KGaA
•
Filing: 1976-05-05
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Granted: 1978-02-14
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Expires: 1996-05-05
Abstract
Abstract Corrodible iron-containing metals (including steel) possess decreased tendency to corrode when contacted with aqueous media (including dilute strong mineral acids) when they carry a surface coating of mixtures of aminoalkanols of the formula: ##STR1## wherein R 1 and R 2 each represent a C 1-21 alkyl; and wherein the sum of the carbon atoms in R 1 and R 2 is 6 to 22. The vicinal ##STR2## substituents are non-terminal and are preferably uniformly distributed along the chain. The aminoalkanols are useful both in free base and in salt form.
Inventors
- 👤 Karlheinz Koch
- 👤 Gerhard Kolaczinski
- 👤 Wolfgang Rupilius
- 👤 Werner Stein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:15
CPC Classifications
C; C10; C10M; C10M133/00; C10M133/02; C10M133/04; C10M133/06; C10M133/08; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/14; C23F11/141; C23F11/142; C10M2215/00; C10M2215/02; C10M2215/04; C10M2215/042; C10N; C10N2030/00; C10N2030/12; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
90 words
A shaped article having a surface of a corrodible iron-containing metal, said surface carrying a corrosion-inhibiting coating of a material selected from the group consisting of (A) mixtures of at least two amino-alkanols of the formula: ##STR6## wherein R 1 and R 2 each represent C 1-21 alkyl; and wherein the sum of the carbon atoms in R 1 and R 2 is between 6 and 22; and (B) salts thereof, the vicinal ##STR7## substituents being statistically distributed along the ##STR8## chain in accordance with known frequency of distribution curves.
Claim 2
Dependent Claim
90 words
A shaped article having a surface of a corrodible iron-containing metal, said surface carrying a corrosion-inhibiting coating of a material selected from the group consisting of (A) mixtures of at least two amino-alkanols of the formula: ##STR6## wherein R 1 and R 2 each represent C 1-21 alkyl; and wherein the sum of the carbon atoms in R 1 and R 2 is between 6 and 22; and (B) salts thereof, the vicinal ##STR7## substituents being statistically distributed along the ##STR8## chain in accordance with known frequency of distribution curves.
Claim 3
Dependent Claim
11 words
An article according to claim 1 wherein the surface is steel.
Claim 4
Dependent Claim
16 words
An article according to claim 1 wherein the mixture of aminoalkanols is present as a salt.
Claim 5
Dependent Claim
20 words
An article according to claim 3 wherein the mixture of aminoalkanols is present as a salt with an organic acid.
Claim 6
Dependent Claim
25 words
An article according to claim 1 wherein the sum of the carbon atoms in the R 1 and R 2 substituents is 9 to 12.
Claim 7
Dependent Claim
14 words
An article according to claim 1 wherein the coating is of substantially monomolecular thickness.
Claim 8
Dependent Claim
99 words
A process for inhibiting the tendency of a shaped article having a surface of a corrodible iron-containing metal to corrode when in contact with an aqueous medium, which comprises uniformly coating said surface with a corrosion-inhibiting material selected from the group consisting of (A) mixtures of at least two aminoalkanols of the formula: ##STR9## wherein R 1 and R 2 each represent C 1-21 alkyl; and wherein the sum of the carbon atoms in R 1 and R 2 is between 6 and 22; and (B) salts thereof, the vicinal ##STR10## substituents being distributed uniformly along the ##STR11## chain.
Claim 9
Dependent Claim
99 words
A process for inhibiting the tendency of a shaped article having a surface of a corrodible iron-containing metal to corrode when in contact with an aqueous medium, which comprises uniformly coating said surface with a corrosion-inhibiting material selected from the group consisting of (A) mixtures of at least two aminoalkanols of the formula: ##STR9## wherein R 1 and R 2 each represent C 1-21 alkyl; and wherein the sum of the carbon atoms in R 1 and R 2 is between 6 and 22; and (B) salts thereof, the vicinal ##STR10## substituents being distributed uniformly along the ##STR11## chain.
Claim 10
Dependent Claim
22 words
A process according to claim 7 wherein said corrosion-inhibiting material is coated on said surface in solution in an anhydrous organic solvent.
Claim 11
Dependent Claim
43 words
A process according to claim 8 wherein said corrosion-inhibiting material is coated on said surface as a free base in solution in an anhydrous organic solvent, and said surface is contacted with an acid whereby said free base is converted to salt form.
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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) | 1981-02-13 | 1981-08-15 | 1982-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-13 | 1985-08-15 | 1986-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-13 | 1989-08-15 | 1990-02-14 | $7700.00 | Window Closed / Lapsed |