The Efficacy of a Chelating Agent-Based Oxide Remover to Clean Corrosion Products from Ferrous Fracture Surfaces
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Challenges exist when cleaning fracture surfaces to reveal fractographic features without damaging the fracture surfaces further. This technical paper will compare the efficacy of cleaning ferrous-based fracture surfaces with a chelating stripping agent versus inhibited acid solutions. The chelating stripping agent used in this study was commercially available Evapo-Rust. The inhibited acid solutions used in this study were ASTM G1 C.3.1 solution and ASTM G1 C.3.5 solution. In this study, metallographically prepared samples of annealed type 8620 steel were immersed in the ASTM G1 C.3.1 solution, ASTM G1 C.3.5 solution, and Evapo-Rust for different times under inactive and ultrasonic conditions. The extent of damage to the polished surfaces was qualitatively examined using various types of optical microscopy. The sample damage was visually compared to a baseline sample etched with 2% natal. The indices used to qualify the extent of damage were the existence of pits and microstructural etching. It was found that a chelating agent-based oxide remover causes less etching and pitting on metallographically prepared annealed type 8620 steel samples than inhibited acid solutions.
KeywordsCorrosion Ultrasonic Steel microstructure Pitting Optical microscopy Microstructure
This article is the work product of National Transportation Safety Board staff members as part of their official duties. This work product does not require review by the appointed Board Members of the NTSB. The article is work of the United States Government, and copyright protection is not available in the United States for any work of the United States Government, pursuant to 17 U.S.C. § 105.
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