TOPCOATING ZINC-RICH PRIMERS

Properties of inorganic and organic zinc-rich primers which may cause trouble of favor adhesion and good performance of topcoats are discussed. Characteristics of top surfaces of inorganic zinc rich primers are related to inherent properties (i.e., alkalinity), character of atmospheric contaminants to which they are exposed, cure time, and temperature. Reasons for the formation of bubbles, loss of adhesion or other topcoat failures are enumerated, including trapped air or moisture, thickness of topcoat, ability of topcoat to permit escape of trapped gases or moisture, surface oxidation or other zinc reaction products and application variables are considered. Case histories are given of successful and unsuccessful topcoating and a summary of theoretical reasons for topcoat failure presented. A list of recommendations to minimize topcoating problems includes weathering, accelerated cure, use of tie-coat, wash primers, mist coat, various thinner coats. A procedure for analyzing ingredients on paint chips is given and results of scanning electron microscope studies are included.

  • Availability:
  • Corporate Authors:

    National Association of Corrosion Engineers

    P.O. Box 1499
    Houston, TX  United States  77001
  • Authors:
    • Tator, K B
  • Publication Date: 1976-3

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00138047
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Files: TRIS
  • Created Date: Aug 23 1976 12:00AM