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Characterizing Corrosion On AA-7075 Through Alternative Cleaning Methods And Optical Profilometry

Picture for Characterizing Corrosion On AA-7075 Through Alternative Cleaning Methods And Optical Profilometry
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Measuring the severity of corrosion on a specific alloy is often accomplished via mass loss using ASTM G-1. These processes work well and provide high fidelity data for many materials, especially steels. However, recent internal findings and disclosures from other research groups have highlighted a potential issue with using mass loss techniques to measure the damage on some aluminum alloy surfaces.

Product Number: 51322-17579-SG
Author: Steven Kopitzke, Karla De Jesus Santiago, Rachel Black
Publication Date: 2022
Industries: Coatings and Linings , Coatings
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Recent efforts have highlighted a potential issue in the currently accepted ASTM G-1 mass loss standard as an effective means for evaluating corrosion damage on aluminum alloy 7075-T6. It was found that the use of the current standard can result in users reporting mass loss values that are inconsistent with the visual corrosion assessment, including mass gain instead of loss on obviously corroded samples. It is hypothesized that the current method of repeated immersion in acidic solution followed by mechanical cleaning is not effective at dislodging corrosion product from the pits formed on a corroded aluminum surface. To address this issue, studies have been completed to evaluate a two-step method for corrosion analysis. First, ultrasonic cleaning of coupons in nitric acid more effectively removes corrosion from the corroded surface. Second, follow-on analysis of the cleaned coupons with both mass loss and optical profilometry demonstrated that there is significant amount of corrosion information which analysis via mass loss alone will not reveal. The present work focuses on the refinement of a new cleaning protocol for aluminum and the use of profilometry to assess coupons corroded in outdoor exposure and accelerated corrosion tests.

Recent efforts have highlighted a potential issue in the currently accepted ASTM G-1 mass loss standard as an effective means for evaluating corrosion damage on aluminum alloy 7075-T6. It was found that the use of the current standard can result in users reporting mass loss values that are inconsistent with the visual corrosion assessment, including mass gain instead of loss on obviously corroded samples. It is hypothesized that the current method of repeated immersion in acidic solution followed by mechanical cleaning is not effective at dislodging corrosion product from the pits formed on a corroded aluminum surface. To address this issue, studies have been completed to evaluate a two-step method for corrosion analysis. First, ultrasonic cleaning of coupons in nitric acid more effectively removes corrosion from the corroded surface. Second, follow-on analysis of the cleaned coupons with both mass loss and optical profilometry demonstrated that there is significant amount of corrosion information which analysis via mass loss alone will not reveal. The present work focuses on the refinement of a new cleaning protocol for aluminum and the use of profilometry to assess coupons corroded in outdoor exposure and accelerated corrosion tests.

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