Claims
- 1. A method for inhibiting corrosion of a metal surface consisting of a member of the group consisting of steel and aluminum, which consists of maintaining in an aqueous fluid in contact with said surface a corrosion inhibiting amount of a corrosion inhibiting composition consisting essentially of:
- a. water-soluble hydroxyamine phosphate ester, said amine phosphate ester comprising the reaction product of polyphosphoric acid, phosphorus pentoxide or a mixture of polyphosphoric acid and phosphorus pentoxide with a water-soluble hydroxyamine;
- b. sufficient water-soluble zinc compound to provide from 0.005 to 15 parts by weight of zinc ion for each part by weight of said phosphate ester; and
- c. sufficient water-soluble 1,2,3-triazole to provide from 0.005 to 15 parts by weight of said azole or azole derivative for each part by weight of said phosphate ester.
- 2. The method as defined in claim 1 in which said hydroxyamine is triethanolamine.
- 3. The method as defined in claim 1 in which said zinc compound is a water-soluble zinc salt.
- 4. The method as defined in claim 1 wherein said azole is benzotriazole.
- 5. The method as defined in claim 1 which consists essentially of maintaining in the aqueous fluid in contact with such metal surface
- a. at least about 0.5 parts per million of water-soluble hydroxyamine phosphate ester;
- b. at least about 0.0025 parts per million of zinc (Zn.sup.+2) ion; and
- c. at least about 0.0025 parts per million of water-soluble 1,2,3-triazole.
Parent Case Info
This is a continuation of application Ser. No. 350,858, filed Apr. 13, 1973 and now abandoned, which is a continuation of application Ser. No. 136,592, filed Apr. 22, 1971 and now abandoned.
US Referenced Citations (5)
Number |
Name |
Date |
Kind |
3477956 |
Stanford et al. |
Nov 1969 |
|
3483133 |
Hatch et al. |
Dec 1969 |
|
3510436 |
Silverstein et al. |
May 1970 |
|
3532639 |
Hatch |
Oct 1970 |
|
3620974 |
Stanford et al. |
Nov 1971 |
|
Continuations (2)
|
Number |
Date |
Country |
Parent |
350858 |
Apr 1973 |
|
Parent |
136592 |
Apr 1971 |
|