CORROSION TESTS OF METALLIZED COATED STEEL

THE LIFE OF METALLIZED COATINGS DEPENDS ON THE TYPE OF ENVIRONMENT, THICKNESS OF COATINGS, AND TYPE OF SEAL COAT USED. ALTHOUGH TESTS HAVE BEEN IN PROGRESS ONLY FOR A SHORT TIME, SOME CONCLUSIONS CAN BE MADE ON THE LONGEVITY OF THE CORROSION PROTECTION ABILITIES OF THE METALLIZED COATINGS. THE LIFE OF THE UNSEALED ALUMINUM COATINGS IS DEFINITELY LONGER THAN A COMPARABLE ZINC COATING FOR THE THINNEST COATING THICKNESSES. HOWEVER, NO ESTIMATE CAN BE MADE ON THE ACTUAL LONGEVITY OF ALUMINUM COATINGS. THE LIFE OF UNSEALED ZINC COATINGS APPEARS TO BE DIRECTLY RELATED TO THE COATING THICKNESS AND THE ENVIRONMENT. THE TYPE OF BASE METAL PREPARATION, PRIOR TO THE METALLIZING OPERATION, WITHIN THE RANGE OF ABRASIVES USED IN THIS PROGRAM, DOES NOT APPEAR TO HAVE ANY EFFECT ON THE CORROSION PROTECTION PROPERTIES OF THE METALLIZED COATINGS. IN ALL ENVIRONMENTS THE SEALED ALUMINUM COATED PANELS ARE THE LEAST AFFECTED WITH RESPECT TO COATING DISSIPATION AND MARRING OF ACTUAL APPEARANCE. THOSE SEALED WITH TWO SEAL COATS ARE IN SLIGHTLY BETTER CONDITION THAN THOSE WITH ONE SEAL COAT. THE ALUMINUM VINYL SEAL COAT ON THE ZINC COATED PANELS HAS LENGTHENED THE LIFE OF THE ZINC COATINGS WHEN COMPARED TO THE UNSEALED ZINC COATINGS. CHLORINATED RUBBER SEALED COATINGS HAVE NO ADVANTAGE OVER THE UNSEALED COATINGS AND, IN SOME CASES, THE CHLORINATED RUBBER SEAL COAT HAS DETRIMENTAL EFFECTS. FOR SEA WATER EXPOSURE APPLICATIONS, METALLIZED ALUMINUM SEALED WITH CLEAR VINYL IS THE BEST COATING SYSTEM TESTED IN THIS PROGRAM FOR THE CORROSION PROTECTION OF STEEL.

• Supplemental Notes:
  • Vol 2, No 8
• Corporate Authors:

  American Welding Society

  550 N.W. Le Jeune Road
  Miami, FL  United States  33126
• Publication Date: 1962

Subject/Index Terms

• TRT Terms: Abrasives; Aluminum; Base metal; Chlorination; Corrosion tests; Environment; Metal coatings; Protective coatings; Rubber; Seal coats; Seawater; Steel; Thickness; Vinyl resins; Zinc
• Subject Areas: Geotechnology; Highways; Materials;

Filing Info

• Accession Number: 00216444
• Record Type: Publication
• Files: TRIS
• Created Date: May 21 1994 12:00AM