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A Study of the Effect of Film Thickness and Blast Profile on Accelerated Underfilm Corrosion Creep

A Study of the Effect of Film Thickness and Blast Profile on Accelerated Underfilm Corrosion Creep
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The creepage of corrosion underneath a coatings film applied to a steel test panel is often used as a performance test for the anti-corrosion properties of a coating system. Underfilm corrosion creep, also sometimes referred as scribe creep in the laboratory environment, is defined as the degree of corrosion emanating away from a scribe line underneath a coating film applied to a steel substrate. 

Product Number: 41213-779-SG
Author: Carl W. Reed
Publication Date: 2013
Industries: Coatings , Corrosion Monitoring and Control
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$20.00
$20.00

The creepage of corrosion underneath a coatings film applied to a steel test panel is often used as a performance test for the anti-corrosion properties of a coating system. Underfilm corrosion creep, also sometimes referred as scribe creep in the laboratory environment, is defined as the degree of corrosion emanating away from a scribe line underneath a coating film applied to a steel substrate. There are several factors which may affect the degree of corrosion creep, two of these being dry film thickness of the coating and the peak height of the blast profile of a steel substrate. A study was undertaken to compare the effect on corrosion creep of: 1) A coatings film applied at various thicknesses (2 to 10 mils DFT) over a standard abrasive blasted steel surface and 2) A coatings film applied at constant thickness over an abrasive blasted steel surface of various maximum peak heights (peak heights ranging from 1 to 4 mils). The study was conducted using a two-pack epoxy primer containing no corrosion inhibiting pigment. The scribed coatings films were subjected to both continuous neutral salt spray (ASTM B117) and cyclic ammonium sulfate/sodium chloride spray (ASTM G85 Annex A5) for 2000 hours. The test panels were evaluated for underfilm corrosion creepage. The effects of the variations of either the film thickness or of the blast profile characterizations are reported.

The creepage of corrosion underneath a coatings film applied to a steel test panel is often used as a performance test for the anti-corrosion properties of a coating system. Underfilm corrosion creep, also sometimes referred as scribe creep in the laboratory environment, is defined as the degree of corrosion emanating away from a scribe line underneath a coating film applied to a steel substrate. There are several factors which may affect the degree of corrosion creep, two of these being dry film thickness of the coating and the peak height of the blast profile of a steel substrate. A study was undertaken to compare the effect on corrosion creep of: 1) A coatings film applied at various thicknesses (2 to 10 mils DFT) over a standard abrasive blasted steel surface and 2) A coatings film applied at constant thickness over an abrasive blasted steel surface of various maximum peak heights (peak heights ranging from 1 to 4 mils). The study was conducted using a two-pack epoxy primer containing no corrosion inhibiting pigment. The scribed coatings films were subjected to both continuous neutral salt spray (ASTM B117) and cyclic ammonium sulfate/sodium chloride spray (ASTM G85 Annex A5) for 2000 hours. The test panels were evaluated for underfilm corrosion creepage. The effects of the variations of either the film thickness or of the blast profile characterizations are reported.

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