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51317--9730-Quantitative Comparison of Outdoor Sites and Accelerated Test Methods Using Optical Profilometry

Picture for Quantitative Comparison of Outdoor Sites and Accelerated Test Methods Using Optical Profilometry
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A quantitative technique was developed to assess the extent of corrosion damage in two sets of coated lap coupons: one exposed at several outdoor test sites and one that underwent both neutral and acidified salt fog testing. Techniques includeded imaging and analyzing the corroded surfaces with 3D optical profilometry.

Product Number: 51317--9730-SG
ISBN: 9730 2017 CP
Author: David Jackson
Publication Date: 2017
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$20.00
$20.00

Standardized accelerated corrosion testing is required to qualify new environmentally-friendly coating systems but analysis of accelerated test articles is often based on a qualitative visual inspection. A quantitative technique was developed to assess the extent of corrosion damage in two sets of coated lap coupons: one that was exposed at several outdoor test sites and another that underwent both neutral and acidified salt fog testing. The technique included imaging and analyzing the corroded surfaces with 3D optical profilometry. Scribes were imaged separately to obtain 2D and 3D surface profiles of corrosion morphology. Profilometry data was then analyzed to determine several surface parameters including maximum scribe depth average scribe depth scribe volume lateral surface area and contour surface area. Additional comparisons were made between chromated and non-chromated coating systems static and cyclic testing protocols and different fastener types. Preliminary findings show that six months of outdoor exposure was not sufficient to initiate substantial corrosion in lap specimens and the extent of damage at six months was not distinguishable enough to rank coating performance. In comparison after only 1500 hours of accelerated testing in ASTM G85-A5 the contour surface area in the scribe (i.e. “corroded area”) showed definite trends that could be used to assess coating performance. Thus imaging techniques have been developed that quantify the extent of corrosion damage caused by different testing protocols and enable a statistical comparison between test articles exposed outdoors and those exposed to accelerated chamber tests.

Key words: Atmospheric Corrosion, Outdoor Exposure, Accelerated Testing, Profilometry

 

Standardized accelerated corrosion testing is required to qualify new environmentally-friendly coating systems but analysis of accelerated test articles is often based on a qualitative visual inspection. A quantitative technique was developed to assess the extent of corrosion damage in two sets of coated lap coupons: one that was exposed at several outdoor test sites and another that underwent both neutral and acidified salt fog testing. The technique included imaging and analyzing the corroded surfaces with 3D optical profilometry. Scribes were imaged separately to obtain 2D and 3D surface profiles of corrosion morphology. Profilometry data was then analyzed to determine several surface parameters including maximum scribe depth average scribe depth scribe volume lateral surface area and contour surface area. Additional comparisons were made between chromated and non-chromated coating systems static and cyclic testing protocols and different fastener types. Preliminary findings show that six months of outdoor exposure was not sufficient to initiate substantial corrosion in lap specimens and the extent of damage at six months was not distinguishable enough to rank coating performance. In comparison after only 1500 hours of accelerated testing in ASTM G85-A5 the contour surface area in the scribe (i.e. “corroded area”) showed definite trends that could be used to assess coating performance. Thus imaging techniques have been developed that quantify the extent of corrosion damage caused by different testing protocols and enable a statistical comparison between test articles exposed outdoors and those exposed to accelerated chamber tests.

Key words: Atmospheric Corrosion, Outdoor Exposure, Accelerated Testing, Profilometry

 

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