AN IMAGING TECHNIQUE TO MEASURE RUST CREEPAGE AT SCRIBES ON COATED TEST PANELS

Accelerated lab testing and outdoor exposure at a known site are 2 common methods for testing coating performance. It is standard practice to apply coatings to steel panels and scribe a defect into the coating, exposing the steel surface along the scribe line. At predetermined test intervals, the coatings are evaluated for the degree of rusting and blistering on the coating surface and the degree of rust creepage developed at the scribe. Many of today's industrial bridge coatings do not generate any surface failures after a relatively long exposure period, but some degree of rust creepage at a scribe usually develops early. Therefore, scribe creepage plays a key role in the evaluation of coating performance, as various coatings can be compared in a relatively short time. As performance of commercially available industrial coatings continues to improve, the measured value of scribe cutback continues to shrink. In addition, the variability of measurements using the present crude manual measurement technique becomes more critical. Therefore, the FHWA undertook the effort described herein to determine a practical yet more consistent and repeatable method for making scribe cutback measurements.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/87551985
• Corporate Authors:

  Technology Publishing Company

  2100 Wharton Street, Suite 310
  Pittsburgh, PA  United States  15203
• Authors:
  • Yao, Y
  • Chong, S-L
• Publication Date: 2002-1

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 67-79
• Serial:
  • Journal of Protective Coatings & Linings
  • Volume: 79
  • Issue Number: 1
  • Publisher: Steel Structures Painting Council
  • ISSN: 8755-1985

Subject/Index Terms

• TRT Terms: Bridge engineering; Coatings, fillers and paints; Highway maintenance; Highway transportation; Protection against environmental damage; Protective coatings; Rust prevention; Tests specific to a material, structure or device
• Identifier Terms: U.S. Federal Highway Administration
• Uncontrolled Terms: Bridge maintenance
• Subject Areas: Bridges and other structures; Design; Highways; Maintenance and Preservation; I24: Design of Bridges and Retaining Walls; I61: Equipment and Maintenance Methods;

Filing Info

• Accession Number: 00920960
• Record Type: Publication
• Files: TRIS
• Created Date: Mar 6 2002 12:00AM