ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY STUDY OF CORROSION OF PAINTED COLD-ROLLED AND ELECTROGALVANIZED SHEET STEEL FOR AUTOMOTIVE USE

The U.S. Bureau of Mines has been conducting research on the use of waste-derived zinc as a partial replacement for pure zinc in the electrogalvanizing process. The end product of this process is automotive sheet, which has enhanced cosmetic protection over previously used cold-rolled (CR) steel. In the study, primer-coated specimens of CR and elecrogalvanized (EG) steel were subjected to the on-vehicle environment and periodically monitored by electrochemical impedance spectroscopy (EIS) during immersion in 1M NaCl solution. The relts of these tests were compared to immersion-only conditions. Scanning electron microscope (SEM) and energy dispersive x-ray (EDX) techniques were also used to evaluate the corrosion processes and compare them to atmospheric exposure specimens. EIS was found to measure the corrosion associated with on-vehicle exposure, thus providing an excellent screening technique for evaluation of the performance of EG automotive sheet steel.

• Corporate Authors:

  Bureau of Mines

  C Street Between 18th and 19th Streets, NW
  Washington, DC  United States  20241
• Authors:
  • Dattilo, M
  • Prater, R B
  • Miller, V R
• Publication Date: 1990

Media Info

• Pagination: 19 p.

Subject/Index Terms

• TRT Terms: Corrosion; Corrosion resistant steel; Corrosion tests; Electrical impedance; Electrochemistry; Electron microscopes; Mechanical impedance; Primers; Scanners; Sheet metal; Spectroscopy; Waste products (Materials); Zinc
• Old TRIS Terms: Scanning
• Subject Areas: Highways; Vehicles and Equipment; I94: Vehicle Corrosion;

Filing Info

• Accession Number: 00605354
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: BUMINES-RI-9324
• Files: TRIS
• Created Date: Mar 31 1991 12:00AM