Chromate-free corrosion resistant talc coatings for aluminum alloys

Conference · Wed Jan 01 04:00:00 EST 1992

OSTI ID:6725477

Buchheit, R G ^[1]; Stoner, G E ^[2]

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1. Sandia National Labs., Albuquerque, NM (United States)
2. Virginia Univ., Charlottesville, VA (United States). Dept. of Materials Science and Engineering

Passivity developed by immersion in an alkaline Li salt solution is retained when the Al surface is exposed to an aggressive solution like aerated NaCl. A process for coating Al was developed using a method similar to the chromate conversion process, imparts appreciable corrosion resistance, but does not use or produce hazardous chemicals. Coatings are formed by immersion in 0.1 M Li carbonate solution whose pH is adjusted to 11.5-12.0 by LiOH additions. Immersion times of 1.5 to 90 min were used to produce talc coatings; best time is 15 min. Increased corrosion resistance is obtained if the coating is sealed by elevated temperature treatment in air or distilled water.

• Research Organization: Sandia National Labs., Albuquerque, NM (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 6725477
• Report Number(s): SAND-92-2396C; CONF-930571--5; ON: DE93005370
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
ALKALI METAL COMPOUNDS
ALUMINIUM
CARBON COMPOUNDS
CARBONATES
COATINGS
CORROSION PROTECTION
ELEMENTS
HYDROGEN COMPOUNDS
HYDROXIDES
LITHIUM CARBONATES
LITHIUM COMPOUNDS
LITHIUM HYDROXIDES
METALS
MINERALS
OXYGEN COMPOUNDS
PASSIVATION
PROTECTIVE COATINGS
SALTS
SILICATE MINERALS
SPRAYS
SURFACE TREATMENTS
TALC