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Effect of the Content and Morphology of β‐Compounds and Precipitation on the Corrosion Behavior of Biodegradable Magnesium Alloys
Author(s) -
Gui Zhenzhen,
Kang Zhixin,
Zhou Yan,
Zhang Jianhui
Publication year - 2021
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.202000752
Subject(s) - corrosion , materials science , precipitation , alloy , metallurgy , microstructure , magnesium , electrochemistry , magnesium alloy , immersion (mathematics) , chemical engineering , chemistry , electrode , pure mathematics , physics , meteorology , engineering , mathematics
Microstructure analyses, immersion tests, and electrochemical measurements are performed to investigate the corrosion behavior of Mg–1.59Nd–2.91–Zn–0.05Zr–0.35Mn (NZKM) alloy under three different conditions (as‐cast, heat‐treated, and as‐extruded) in Hanks’ solution. The results indicate that the corrosion rates of the three types of NZKM alloys are all lower than 0.5 mm year −1 . The primary driving force of the NZKM alloys’ corrosion is the microgalvanic coupling between α‐Mg and β‐compounds/precipitates in Hanks’ solution during the corrosion process. The lowest corrosion rates can be attributed to a low content of β‐compounds and less precipitation, a necklace‐type appearance, and discontinuous distribution of the β‐compounds in the heat‐treated NZKM alloy. The clustered precipitation that occurs within the as‐extruded NZKM exacerbates the corrosion process due to the formation of clustered microgalvanic couple groups. These results indicate that the content of β‐compounds and precipitation of the NZKM alloys, as well as their appearances and distributions, should be controlled to allow for further application as biodegradable materials.