A New Protocol for Evaluating the Durability of Coatings Used for Reducing Corrosion of Steel Structures

Details of a new protocol for evaluating the durability of coatings and their effectiveness in reducing corrosion of steel structures is presented in this paper. Basic concepts of accelerated testing specified in American Society for Testing Materials (ASTM) and recent research investigations are incorporated in the proposed method. Growth of corrosion from a damaged-coat location, thinning of coating, color changes and influence of weld and bolt holes were evaluated. The major differences between the proposed method and the current practice are: a circular geometry of preformed damage instead of X shape, use of adhesion strength of the coating to obtain corrosion-creep growth at various stages of corrosion and addition of deep-freezing cycle as part of accelerated corrosion to enhance creep growth. The pull-off strengths provide quantitative and repeatable measurements for estimating the degradation as compared to measuring small amount of creep growth that are typically fuzzy. These measures provide significant and clearly measurable degradation within three months of accelerated exposure. The protocol was evaluated by comparing the performance of 6 coating systems. Out of the 6 coatings, 2 were known to provide very good corrosion protection while 2 others were known to be very weak. The test results were compared with one of the long term field study. The experimental results and the comparative evaluation of the laboratory and field study indicate that the proposed protocol provides an effective procedure for evaluating the performance of protective coatings

  • Supplemental Notes:
    • This paper was sponsored by TRB committee AHD45 Standing Committee on Corrosion.
  • Corporate Authors:

    Transportation Research Board

    ,    
  • Authors:
    • Venkiteela, Giri
    • Caronia, David P
    • Balaguru, Perumalsamy N
  • Conference:
  • Date: 2019

Language

  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; References; Tables;
  • Pagination: 14p

Subject/Index Terms

Filing Info

  • Accession Number: 01697296
  • Record Type: Publication
  • Report/Paper Numbers: 19-00490
  • Files: TRIS, TRB, ATRI
  • Created Date: Dec 7 2018 9:23AM