Surface scanning techniques to locate and study defects in painted zinc and zinc alloy coated steels

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Current density and impedance mapping measurements have been used to locate and monitor corrosion and defects on painted surfaces in solution. Measurements are reported for painted zinc and aluminum-zinc alloy coated steel surfaces. When scratched, current density mapping showed corrosion of the metal coating started at localized sites in both dilute chloride and sulfate solutions. Different scribing techniques were tested exposing only the metal coating and both the coating and the underlying steel. Effect of roll forming was investigated. Current density mapping located corrosion susceptible defects on painted roll formed materials that were not readily discernible optically. Scanning ac mapping ... continued below

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10 p.

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Isaacs, H.S.; Aldykiewicz, A.J. Jr.; Thierry, D. & Simpson, T.C. February 1, 1995.

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Current density and impedance mapping measurements have been used to locate and monitor corrosion and defects on painted surfaces in solution. Measurements are reported for painted zinc and aluminum-zinc alloy coated steel surfaces. When scratched, current density mapping showed corrosion of the metal coating started at localized sites in both dilute chloride and sulfate solutions. Different scribing techniques were tested exposing only the metal coating and both the coating and the underlying steel. Effect of roll forming was investigated. Current density mapping located corrosion susceptible defects on painted roll formed materials that were not readily discernible optically. Scanning ac mapping showed that artificially formed defects were readily observed. Local impedance variations with frequency were measured for simulated defects and defect free areas of painted surfaces. Variations in paint thickness and the presence of defects were detected using the ac techniques.

Physical Description

10 p.

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OSTI as DE95006099

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  • Corrosion `95: National Association of Corrosion Engineers (NACE) international annual conference and corrosion show, Orlando, FL (United States), 26-31 Mar 1995

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  • Other: DE95006099
  • Report No.: BNL--61239
  • Report No.: CONF-950304--13
  • Grant Number: AC02-76CH00016
  • Office of Scientific & Technical Information Report Number: 32515
  • Archival Resource Key: ark:/67531/metadc688566

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • February 1, 1995

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • June 24, 2016, 10:01 p.m.

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Isaacs, H.S.; Aldykiewicz, A.J. Jr.; Thierry, D. & Simpson, T.C. Surface scanning techniques to locate and study defects in painted zinc and zinc alloy coated steels, article, February 1, 1995; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc688566/: accessed October 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.