Engineering Research Report ER-43 contains a description of several epoxy resin coatings on steel plate specimens together with an inspection report of their coatings condition after two years exposure on the Huey Long Bridge, New Orleans, Louisiana, where there is a temperate climate, high humidity and heavy concentration of salt brine from refrigerator cars. This Second Report presents the observations of the condition of these coatings after four years exposure. In addition, a description of the condition of a zinc-rich epoxy resin coating after one year exposure is given. From the appearance of these coatings after four years exposure, it is apparent that the one-coat systems, P1 and C1, the tar-filled systems 242-2 and the proprietary one have completely failed and are offering little if any protection to the base metal. The coating failure is characterized by large blisters, scale and rust. As reported in ER-43, blisters had formed after only eight months exposure. These become enlarged and spread over the plate surface as exposure continued. Scaling and rusting followed. The two-coat systems, 285-1, 385-6 and 385-22, 632-1255 are offering some protection to the plates after four years exposure, as indicated on Table 3. Of these two systems, the 285-22, 632-1255 appears to be offering the most protection. The coating failure of these is characterized by blisters and some peeling, but the blisters are noticeably smaller and have not enlarged and spread to the extent of those in the one-coat systems. The plates in Set B are shown in Photograph 1. The plates having the zinc-rich coatings were placed on the bridge on February 4, 1965 and inspected on January 26, 1966. After one year exposure all of these coatings appear to be in excellent condition with no evidence of any blisters, rusting or other coating breakdown.

  • Supplemental Notes:
    • Conducted under sporsorship of AREA Committees 7 - Wood Bridges and Trestles, 8 - Masonry, and 15 - Iron and Steel Structures.
  • Corporate Authors:

    Association of American Railroads Research Center

    3140 South Federal Street
    Chicago, IL  United States  60616
  • Authors:
    • Drew, F P
  • Publication Date: 1966-4

Media Info

  • Features: Photos; Tables;
  • Pagination: 14 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00096575
  • Record Type: Publication
  • Source Agency: Association of American Railroads
  • Report/Paper Numbers: ER-65
  • Files: TRIS
  • Created Date: Jul 24 1975 12:00AM