In:
Materialwissenschaft und Werkstofftechnik, Wiley, Vol. 51, No. 11 ( 2020-11), p. 1543-1560
Abstract:
In this work, the influence of solution heat treatment and hot extrusion on the microstructure and corrosion behavior of as‐cast Mg−2Y−1Zn−0.4Zr−0.3Sr alloys are systematically investigated via X‐ray diffractometer, scanning electron microscope coupled with energy‐dispersive X‐ray spectroscopy, electrochemical testing, and mass loss testing. The as‐cast alloy comprises α‐Mg matrix and Mn 3 Y 2 Zn 3 (W‐phase). Solution heat treatment and hot extrusion exert a conspicuous influence on the corrosion behavior of Mg−2Y−1Zn−0.4Zr−0.3Sr alloys through microstructure transformation. Both methods can remarkably improve corrosion resistance, and the as‐extruded alloys exhibit an optimal corrosion resistance of 0.0432 mg ⋅ cm −2 ⋅ h −1 via mass loss testing. The three alloys exhibit a similar corrosion mechanism, which is based on galvanic corrosion. In the later stage of corrosion, a three‐tier corrosion layer structure is formed. In combination with an array of analytical methods, the corrosion mechanisms of the three alloys are described in detail.
Type of Medium:
Online Resource
ISSN:
0933-5137
,
1521-4052
DOI:
10.1002/mawe.202000045
Language:
English
Publisher:
Wiley
Publication Date:
2020
detail.hit.zdb_id:
200651-0
detail.hit.zdb_id:
2025930-X
detail.hit.zdb_id:
246726-4
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