Metal treatment
A process is described for increasing the corrosion resistance of a metal object bearing a preexisting protective conversion coating, said process comprising steps of: (A) contacting the pre-existing coating with a composition having a pH from about 5 to about 12 and consisting essentially of: (1) water, (2) from 25-5,000 ppm of triazole molecules selected from the group consisting of aryl triazoles containing from 6 to about 10 carbon atoms and alkyl triazoles containing from 1 to about 6 carbon atoms, and, optionally, (3) at least partially substituted poly(vinylphenol) polymer or copolymer including substituents on at least some of the phenol rings: wherein each of R[sub 5] through R[sub 12] is selected from hydrogen, an alkyl, an aryl, an aryl, a hydroxy-alkyl, an amino-alkyl, a mercapto-alkyl, or a phospho-alkyl moiety, except that R[sub 12] can also be [minus]O[sup [minus]1] or [minus]OH and that at least one of R[sub 9] and R[sub 10] must include a polyhydroxy functionality resulting from the condensation of an amine or ammonia with a ketose, aldose, or other polyhydroxyl compound having from about 3 to about 8 carbon atoms, followed by reduction from imino to amino, and, optionally, (4) polar organic solvents; and (B) drying the object completion of step (A).
- Assignee:
- Henkel Corp., Plymouth, PA (United States)
- Patent Number(s):
- US 5226976; A
- Application Number:
- PPN: US 7-685355
- OSTI ID:
- 6210042
- Resource Relation:
- Patent File Date: 15 Apr 1991
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
METALS
CORROSION RESISTANCE
SURFACE TREATMENTS
ALKYL RADICALS
ARYL RADICALS
CARBON
DRYING
HYDROXIDES
ORGANIC SOLVENTS
PH VALUE
PHENOLS
POLYMERS
PROTECTIVE COATINGS
REDUCTION
TRIAZOLES
AROMATICS
AZOLES
CHEMICAL REACTIONS
COATINGS
ELEMENTS
HETEROCYCLIC COMPOUNDS
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
NONMETALS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
RADICALS
SOLVENTS
360101* - Metals & Alloys- Preparation & Fabrication
360105 - Metals & Alloys- Corrosion & Erosion