Menu
Search
Filters
Close
Menu

Save 20% on select titles with code HIDDEN24 - Shop The Sale Now

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
Available for download

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
$0.00
$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

 

Product tags
Also Purchased
Picture for Remote Monitoring of the Mechanical Integrity of Oil Sands Facility High Wear Components
Available for download

51317--9720-Remote Monitoring of the Mechanical Integrity of Oil Sands Facility High Wear Components

Product Number: 51317--9720-SG
ISBN: 9720 2017 CP
Author: Rob Leary
Publication Date: 2017
$20.00

This paper discusses the implementation of an on-line remote ultrasonic (UT) system at a SAGD (Steam Assisted Gravity Drainage) facility located within the Athabasca oil sands reserves in Northern Alberta.
Picture for Use of Micelle Detection for Corrosion Inhibitor Screening
Available for download

51317--9721-Use of Micelle Detection for Corrosion Inhibitor Screening

Product Number: 51317--9721-SG
ISBN: 9721 2017 CP
Author: Melanie Reid
Publication Date: 2017
$20.00

This paper describes a method of exploiting the critical micelle concentration (CMC) of the corrosion inhibitors to show that the use of CMC can be used as a laboratory screening method for corrosion inhibitor selection.
Picture for Corrosion Detection Using Robotic Vehicles in Challenging Environments
Available for download

51317--9741-Corrosion Detection Using Robotic Vehicles in Challenging Environments

Product Number: 51317--9741-SG
ISBN: 9741 2017 CP
Author: Thaddeus Roppel
Publication Date: 2017
$20.00

Simulation shows that navigation algorithms can guide autonomous vehicles to inspect poles or towers for corrosion, or to inspect enclosed spaces. The algorithms use sensor feature extraction, PID control, dynamic window obstacle avoidance, and genetic algorithm solutions to the traveling-salesman problem.
Categories
Industry
Recently viewed
Popular tags
View all

Association for Materials Protection and Performance

© AMPP All Rights Reserved.
Membership Terms of Content Use
Contact Customer Support