Effect of Aluminum Content on the Crevice Corrosion Behavior of Magnesium Alloys

In this work, the effect of aluminum content on the crevice corrosion behavior of the magnesium alloys has been investigated. The as-cast AZ31, AM60B and AZ80 alloys were subjected to the crevice corrosion in a freely aerated 3.5 wt.% NaCl solution, and the extent of the damage was quantified using...

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Veröffentlicht in:Transactions of the Indian Institute of Metals 2024-05, Vol.77 (5), p.1265-1274
Hauptverfasser: Neetu, Ireddy, Nikhila, Panda, Subha Sanket, Reddy, Uttam, Jain, Jayant, Mondal, K., Singh, Sudhanshu S.
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container_issue 5
container_start_page 1265
container_title Transactions of the Indian Institute of Metals
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creator Neetu
Ireddy, Nikhila
Panda, Subha Sanket
Reddy, Uttam
Jain, Jayant
Mondal, K.
Singh, Sudhanshu S.
description In this work, the effect of aluminum content on the crevice corrosion behavior of the magnesium alloys has been investigated. The as-cast AZ31, AM60B and AZ80 alloys were subjected to the crevice corrosion in a freely aerated 3.5 wt.% NaCl solution, and the extent of the damage was quantified using weight loss measurement and 3D surface topography using an optical profilometer. The as-cast AM60B and AZ31 alloys exhibited the lowest and highest crevice corrosion resistances, respectively. The surface investigation using a scanning electron microscopy (SEM)/energy-dispersive spectroscopy (EDS) and analysis of the corrosion products by Raman spectroscopy, X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) suggested that the corrosion damage predominantly was primarily a function of the volume fraction and distribution of the Mg 17 Al 12 precipitates. The lower corrosion resistance of the as-cast AM60B alloy (corrosion rate ~ 240 mpy) as compared to the as-cast AZ80 alloys (corrosion rate ~ 60 mpy) was attributed to the combined effect of the reduction in the barrier effect of the Mg 17 Al 12 precipitates due to their discontinuous distribution and increase in the extent of the micro-galvanic effect due to the lower aluminum content in the α -Mg matrix in the AM60B alloy.
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subjects Aeration
Aluminum
Chemistry and Materials Science
Corrosion
Corrosion and Coatings
Corrosion effects
Corrosion products
Corrosion rate
Corrosion resistance
Corrosion resistant alloys
Crevice corrosion
Damage
Fourier transforms
Infrared spectroscopy
Magnesium alloys
Magnesium base alloys
Materials Science
Metallic Materials
Original Article
Precipitates
Raman spectroscopy
Spectrum analysis
Tribology
Weight loss measurement
title Effect of Aluminum Content on the Crevice Corrosion Behavior of Magnesium Alloys
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