Characterization of the Surface Chemistry at Corroded and Non-Corroded Sites on Aluminum Alloys 7075-T6 and 2024-T3 Samples Exposed at a Tropical, Coastal Location

Characterization of the Surface Chemistry at Corroded and Non-Corroded Sites on Aluminum Alloys 7075-T6 and 2024-T3 Samples Exposed at a Tropical, Coastal Location

Presenter(s)

Michaela Kendig, Farrah Cole (off-campus contributor)

Comments

Presentation: 3:40-4:00 p.m., Kennedy Union 312

Description

Replicate samples of bare aluminum alloys AA7075-T6 and AA2024-T3 were exposed at a coastal atmospheric test site located at the US Naval Research Laboratory in Key West, FL (NRL-KW). The samples were installed on atmospheric exposure racks and retrieved at intervals of 3, 6, 9, 12, 15 and 18 months. Elemental composition of baseline (non-exposed) and exposed samples were measured using a Zeiss EVO-50XP Environmental Scanning Electron microscope equipped with a EDAX Genesis 2000 energy dispersive X-ray spectroscopy (EDS) system. Pitted and non-pitted sites on each sample were analyzed for compositional elements of the alloy as well as non-compositional elements (i.e., environmentally derived). It was determined that the deposition of environmental elements in pitted locations on the specimens occurred at elevated concentrations to that of major elements present in natural seawater. The deposition and concentration of these environmentally derived elements on the metal surface vary as a function of exposure site and length of exposure time.

Publication Date

4-19-2023

Project Designation

Independent Research

Primary Advisor

Douglas Hansen

Primary Advisor's Department

Chemical and Materials Engineering

Keywords

Stander Symposium, School of Engineering

Institutional Learning Goals

Scholarship

Characterization of the Surface Chemistry at Corroded and Non-Corroded Sites on Aluminum Alloys 7075-T6 and 2024-T3 Samples Exposed at a Tropical, Coastal Location

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