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Malonate and succinate as potential corrosion inhibitors of AZ31 magnesium alloy in 0.9% NaCl
Tkáčová, Karolína ; Buchtík, Martin (referee) ; Doskočil, Leoš (advisor)
The aim of this work was to evaluate the inhibitory effects of malonic acid, succinic acid and their mixture in a 0,15M NaCl solution at pH 7 on AZ31 magnesium alloy. The theoretical part focuses on magnesium, its alloys and alloying elements. It also discusses magnesium corrosion in aqueous environments and the influence of microstructure on corrosion. The final section is dedicated to corrosion inhibitors and small aliphatic acids. The practical part of this work involves potentiodynamic measurements, immersion tests, and subsequent analysis of alloy surfaces. The following concentrations of acids were chosen for studying inhibitory properties: 0.025M, 0.05M, 0.075M, and 0.1M, as well as various mixtures of both acids. Suppression of corrosion was observed in immersion tests for both acids individually and in their mixture. The best inhibitory results in both potentiodynamic polarization (PDP) analysis and immersion tests were achieved with a mixture of 0.025M malonic acid solution and 0.075M succinic acid solution.
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