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The corrosion behaviour was evaluated using immersion tests, electrochemical impedance spectroscopy, hydrogen evolution, glow discharge optical emission spectroscopy, and atomic emission spectroelectrochemistry. A bimodal microstructure is observed for both alloys, with the presence of coarse primary \u03b1\u2010Mg grains, fine secondary \u03b1\u2010Mg grains, \u03b2\u2010phase, and other phases with a minor volume fraction. The amount of coarse primary \u03b1\u2010Mg is significantly higher for the AZ91D compared with the MRI153M. The network of \u03b2\u2010phase around the fine secondary \u03b1\u2010Mg grains is better established in the thixomolded AZ91D alloy. A combination of several factors such as the ratio of primary to secondary \u03b1\u2010Mg grains, localised corrosion or barrier effect due to other phases, as well as regions of preferential dissolution of the \u03b1\u2010Mg due to chemical segregation, are thought to be responsible for the high corrosion resistance exhibited by the thixomolded AZ91D and MRI153M.<\/jats:p>","DOI":"10.1002\/maco.201911327","type":"journal-article","created":{"date-parts":[[2020,1,13]],"date-time":"2020-01-13T07:38:30Z","timestamp":1578901110000},"page":"339-351","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Thixomolded AZ91D and MRI153M magnesium alloys and their enhanced corrosion resistance"],"prefix":"10.1002","volume":"71","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3955-6917","authenticated-orcid":false,"given":"Ricardo H.","family":"Buzolin","sequence":"first","affiliation":[{"name":"Magnesium Innovation Centre 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