CORROSION BEHAVIOR OF GALVANIZED SHEET IN RELATION TO VARIATION IN COATING THICKNESS

Appearance of 5% red rust on commercial galvanized steel at times shorter than the theoretical life of an equivalent thickness of pure zinc is the result of variations in coating thickness. Careful measurements showed that average thickness of 2 g/sq yd (0.7 oz/sq yd or 16.5 g/sq m) zinc was 20.3 microns or 1.87 mils. The thin areas covered somewhat less than half of the total. Tests at 7 sites of widely varying aggressiveness indicated there is no significant difference in the corrosion rate of galvanizing compared to pure zinc. Some evidence indicates that thickness variations are greater as coating thickness increases. /Author/

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00941492
• Corporate Authors:

  National Association of Corrosion Engineers

  P.O. Box 1499
  Houston, TX  United States  77001
• Authors:
  • Bird, C E
• Publication Date: 1977-4

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 14-16
• Serial:
  • Materials Performance (MP)
  • Volume: 16
  • Issue Number: 4
  • Publisher: National Association of Corrosion Engineers
  • ISSN: 0094-1492
  • Serial URL: http://www.nace.org/Publications/Materials-Performance/

Subject/Index Terms

• TRT Terms: Coatings; Corrosion; Galvanizing; Rusting; Steel; Thickness; Variables; Zinc
• Old TRIS Terms: Variations
• Subject Areas: Geotechnology; Highways; Materials;

Filing Info

• Accession Number: 00157260
• Record Type: Publication
• Files: TRIS
• Created Date: Nov 23 1977 12:00AM