TEN YEAR WEATHERING DATA ON ALUMINUM ALLOYS

THE GOOD WEATHERING CHARACTERISTICS OF ALUMINUM ALLOYS WERE CONFIRMED BY THE RESULTS OF THIS TEST PROGRAM INVOLVING EXPOSURES TO TEN YEARS IN URBAN AND MARINE ATMOSPHERES. THE CORROSION IN NATURAL ENVIRONMENTS, MEASURED BY PITTING DEPTH AND CHANGES IN MECHANICAL PROPERTIES, TEND TO REACH A PLATEAU AFTER ABOUT TWO YEARS AND ARE RELATIVELY CONSTANT. THE ALLOY SYSTEM HAVING MAGNESIUM AS THE MAJOR COMPONENT SHOWED GOOD CORROSION RESISTANCE IN ATMOSPHERIC EXPOSURES. BARE ALUMINUM-COPPER ALLOYS (2014 TYPE), ONE OF THE HIGHER STRENGTH ALUMINUM ALLOYS, GENERALLY ARE NOT SUITABLE FOR CORROSIVE ENVIRONMENTS SUCH AS SEVERE MARINE ATMOSPHERES. CORROSION FOR MOST ALUMINUM ALLOYS TAKES THE FORM OF PITTING. IN THIS PROGRAM, A MAXIMUM PIT DEPTH FOR ALL ALUMINUM ALLOYS OF ABOUT 3 MILS WAS FOUND AFTER TEN YEARS IN THE URBAN ATMOSPHERE AND A DEPTH OF ABOUT 8 MILS AFTER TEN YEARS IN THE SEA COAST ENVIRONMENT. THE CORROSION RESISTANCES OF VARIOUS TEMPERS OF THE SAME ALLOYS SHOWED LITTLE VARIATION IN THESE TESTS. CHANGES IN MECHANICAL PROPERTIES OF THE ALUMINUM ALLOYS TESTED OVER TEN YEARS IN BOTH ENVIRONMENTS ARE NOT CONSIDERED SIGNIFICANT. /AUTHOR/

• Supplemental Notes:
  • Vol 2, No 6, PP 30-31
• Authors:
  • Ailor, W H
  • Reinhart, F M
• Publication Date: 1963-6

Media Info

• Serial:
  • Materials Protection
  • Publisher: National Association of Corrosion Engineers

Subject/Index Terms

• TRT Terms: Aluminum alloys; Atmosphere; Copper; Corrosion; Corrosion resistance; Magnesium; Mechanical properties; Pitting; Seas; Time; Urban areas; Weathering
• Uncontrolled Terms: Corrosive environments
• Old TRIS Terms: Marine atmospheres; Urban atmospheres
• Subject Areas: Geotechnology; Highways; Materials;

Filing Info

• Accession Number: 00216454
• Record Type: Publication
• Files: TRIS
• Created Date: May 13 1994 12:00AM