eprintid: 12742 rev_number: 2 eprint_status: archive userid: 1 dir: disk0/00/01/27/42 datestamp: 2023-11-10 03:27:18 lastmod: 2023-11-10 03:27:18 status_changed: 2023-11-10 01:49:25 type: article metadata_visibility: show creators_name: Van Sy, L. creators_name: Quoc Binh, P.M. creators_name: Lal, B. creators_name: Nguyen, Q.B. creators_name: Van Hung, T. creators_name: Panaitescu, C. creators_name: Nam, N.D. title: The role of alloyed strontium in the microstructures and alkaline electrochemistry of Mg-5Al-4Sn alloys ispublished: pub keywords: Alloying elements; Aluminum corrosion; Aluminum metallography; Aluminum oxide; Charge transfer; Corrosion resistance; Corrosion resistant alloys; Electrochemical corrosion; Electrochemical impedance spectroscopy; Electrochemistry; Grain boundaries; Magnesium alloys; Magnesium metallography; Pitting; Polarization; Scanning electron microscopy; Ternary alloys; Tin alloys; Tin metallography; Tin oxides; X ray photoelectron spectroscopy, Alkaline solutions; Charge transfer resistance; Constant phase element; Passive current densities; Pitting potential; Pitting resistance; Potentiodynamic polarization measurements; Potentiostatics, Aluminum alloys note: cited By 2 abstract: In this study, strontium is used as an alloying element for improving the pitting resistance of Mg-5Al-4Sn based alloys in an alkaline solution. Potentiodynamic polarization measurements suggest that the addition of strontium increases the robustness of the pitting resistance as a result of the higher pitting potential and wider range of passive potential. Electrochemical impedance spectroscopy (EIS) confirms the formation of a solid passive film on the alloy surface due to a significant increase in the passive film and the charge transfer resistance, as well as lower film and double layer constant phase element magnitude values. Additionally, the potentiostatic polarisation results also show a lower passive current density and passive film stability, resulting in an increase in the breakdown time when the amount of strontium added to the alloy increases from 0.0 to 1.0 wt. Furthermore, the scanning electron microscopy results indicate that insignificant corrosion is observed on alloy specimens containing strontium, whereas there is fierce corrosion on alloy based surfaces. This robust corrosion resistance could be attributed to the α-grain reduction and refined precipitates at the alloy grain boundaries, resulting in promoted formation of the passive film which is formed from a mixture of magnesium, aluminum and tin oxides/hydroxides, as confirmed by the X-ray photoelectron spectroscopy results. © The Royal Society of Chemistry 2020. date: 2020 publisher: Royal Society of Chemistry official_url: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85091897988&doi=10.1039%2fd0ra01956a&partnerID=40&md5=df5514b2bf75ea5d6ce2d036adcb4509 id_number: 10.1039/d0ra01956a full_text_status: none publication: RSC Advances volume: 10 number: 57 pagerange: 34387-34395 refereed: TRUE issn: 20462069 citation: Van Sy, L. and Quoc Binh, P.M. and Lal, B. and Nguyen, Q.B. and Van Hung, T. and Panaitescu, C. and Nam, N.D. (2020) The role of alloyed strontium in the microstructures and alkaline electrochemistry of Mg-5Al-4Sn alloys. RSC Advances, 10 (57). pp. 34387-34395. ISSN 20462069