ALUMINUM ALLOYS WITH IMPROVED HIGH TEMPERATURE AQUEOUS CORROSION RESISTANCE

Journal Article · Sun Jul 01 04:00:00 EDT 1962 · J. Nuclear Materials

DOI:https://doi.org/10.1016/0022-3115(62)90266-0· OSTI ID:4783077

Draley, J E; Ruther, W E; Greenberg, S

The corrosion resistance of Al-1 wt% Ni-0.5 wt% Fe-0.1 wt% Ti (A288) was studied at 260 to 350 deg C. The temperature at which improved corrosion behavior was obtained depended on the silicon content, ranging from 315 deg C for 10 ppm Si to 360 deg C for 150 ppm Si. Static corrosion tests of A288 at 260, 290, and 350 deg C indicated no breakaway phenomenon during about 200 days exposure to water. Under dynamic conditions (315 deg C, 18 ft/sec, low ratio of Al surface to system volume) the alloy exhibited a constant corrosion rate of 4.2 mil per year. The application of stress during corrosion did not increase the intergranular penetration. No unusual or accelerated corrosion was found for A288 in a boiling test with a heat flux of 42 watts/cm/sup 2/ at 252 deg C, 600 psi. Significant increases in high temperature tensile strength were obtained by adding small amounts of zirconium and chromium to the basic composition. The creep resistance of the best alloy at 4000 psi-290 deg C was poor. Experiments designed to probe the mechanism of corrosion indicated that the corrosion barrier for low silicon alloys at 350 deg C was concentrated at or near the metal-oxide interface and that the deleterious effect of silicon was shared by other members of its periodic group. Chemical analyses showed that for lowsilicon alloys at 350 deg C, the inner layer of corrosion product was enriched in iron and nickel, whereas the loose outer layer was depleted in these elements. At 290 deg C, the iron and nickel in the product were equal to the concentrations calculated from the composition of the alloy. For alloys containing more silicon, the corrosion product formed at 350 deg C was enriched in silicon. (auth)

• Research Organization: Argonne National Lab., Ill.
• NSA Number: NSA-16-030739
• OSTI ID: 4783077
• Report Number(s): ANL-F6F-298
• Journal Information: J. Nuclear Materials, Journal Name: J. Nuclear Materials Vol. Vol: 6
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ALUMINUM ALLOYS
BOILING
CHROMIUM ALLOYS
CORROSION
CREEP
EFFICIENCY
FILMS
HIGH TEMPERATURE
IRON ALLOYS
MATERIALS TESTING
METALS, CERAMICS, AND OTHER MATERIALS
NICKEL ALLOYS
PRESSURE
QUALITATIVE ANALYSIS
QUANTITY RATIO
REACTION KINETICS
SILICIDES
SILICON
STABILITY
STRESSES
TENSILE PROPERTIES
TITANIUM ALLOYS
WATER
ZIRCONIUM ALLOYS