The US Army Corps of Engineers Paint Technology Center of Expertise (PTCx) is investigating a new method of analyzing the amount of rust creep on coatings post exposure to accelerated weathering (ISO 12944) to determine the feasibility of increasing precision and accuracy. The current ASTM D1654-08 recommends a ruler to measure the distance from the initial scribe line to the edge of the rust creep region on a coated and weathered panel or coupon. Our method utilizes a microscope and image-processing software to calculate the entire area of the rust creep. The image processor integrates the initial state image with the final state image of the coupon to greater utilize the amount of information produced in corrosion experiments.

A comparison of both the ASTM method and our method shows that our digitally-enhanced process can improve the accuracy of corrosion measurement and analysis. This data-capture process provides a possible way to improve the current ASTM by collecting more rust creep data and introducing more automated image processing methods, thus removing human introduced variability. The combined effect of using more information and decreasing variability should be a more accurate quantification of rust creep.

Subject
Steel panels, Coatings, Slopes, Research and development, Engineering, Rust, Corrosion data, Engineers, Accelerated weathering, Construction, Creep, Paints, Samples
Keywords:
Rust creep, image-processing software, image software, corrosion, ASTM, standards
Government work published by the Association for Materials Protection and Performance (AMPP) with permission of the author(s). Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
2023
GOV
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