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Understanding the corrosion mechanism in heat treated 5028-H116 aluminium alloy

Krishnamurthy, Sanjay Channappa
(2021)

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Krishnamurthy_96351900_2021.pdf
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Details

Supervisors
Simar, Aude ; Pardoen, Thomas
Faculty
Ecole polytechnique de Louvain
Degree label
Master [120] : ingénieur civil mécanicien, à finalité spécialisée
Abstract
The corrosion behaviour in 5028-H116 aluminium alloy post thermo-mechanical heat treatment is studied. 5xxx series aluminium alloys are known to be susceptible to Inter granular corrosion (IGC) when exposed to elevated temperature (>50°C), due to the formation of ß phase (Al3Mg2) precipitates in grain boundary. The aim of this study was optimising the cooling rate, after thermo-mechanical heat treatment, and determining its effect on the corrosion behaviour during the service life. Rapid cooling and furnace cooling was implemented as two main categories of cooling. The nitric acid mass loss test (NAMLT) was conducted to evaluate the resistance to IGC, coupled with Differential scanning calorimetry (DSC) to identify ß phase precipitates. The metallographic analysis showed the orientation dependency of IGC penetration. The cooling rate post thermo-mechanical heat treatment was observed to have major effect on IGC during service life. The study revealed the best protection against corrosion with furnace cooling as ideal cooling rate and it is proposed that it is related to discontinuous ß phase precipitate formation during service life.