Environmentally-induced passivity of aluminum alloys and aluminum metal-matrix composites. Final report, 1 Oct 87-30 Sep 90
This final report presents a summary of the work performed under Contract No. N00014-88-K-0034. One of the goals of the research carried out was to develop corrosion protection methods for Al-based materials which can replace the presently used chromate conversion coatings with modified surface layers of equal or even better resistance to localized corrosion. The past work first evaluated the use of rare earth metal chlorides (REMC) for the passivation of Al alloys and Al/SiC by a simple immersion treatment. Very corrosion resistant surfaces have been obtained in this manner which did not show any localized corrosion during exposure to aerated NaCl for periods up to 60 days. In an attempt to shorten the passivation time, a passivation treatment in solutions of CeCl{sub 3}, and Ce(NO{sub 3}){sub 3} has been developed. Very corrosion resistant surfaces have been produced in a process in which immersion in CeCl{sub 3} and Ce(NO{sub 3}){sub 3} was followed by an electrochemical treatment in Na{sub 2}MoO{sub 4}.
- Research Organization:
- University of Southern California, Los Angeles, CA (USA). Dept. of Materials Science and Engineering
- OSTI ID:
- 5812913
- Report Number(s):
- AD-A-231350/0/XAB; CNN: N00014-88-K-0034
- Country of Publication:
- United States
- Language:
- English
Similar Records
Chromate-free corrosion resistant talc coatings for aluminum alloys
X-ray absorption study of cerium in the passive film on aluminum
Related Subjects
360105* -- Metals & Alloys-- Corrosion & Erosion
360604 -- Materials-- Corrosion
Erosion
& Degradation
ALLOYS
ALUMINIUM ALLOYS
CARBIDES
CARBON COMPOUNDS
CHEMICAL REACTIONS
CHEMISTRY
CHROMATES
CHROMIUM COMPOUNDS
COATINGS
COMPOSITE MATERIALS
CONVERSION
CORROSION
CORROSION PROTECTION
CORROSION RESISTANCE
ELECTROCHEMISTRY
ELEMENTS
ENVIRONMENT
LAYERS
MATERIALS
MATRIX MATERIALS
METALS
MODIFICATIONS
MOLYBDATES
MOLYBDENUM COMPOUNDS
OXYGEN COMPOUNDS
PASSIVITY
RARE EARTHS
REFRACTORY METAL COMPOUNDS
RESEARCH PROGRAMS
SILICON CARBIDES
SILICON COMPOUNDS
SURFACES
TRANSITION ELEMENT COMPOUNDS