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Unexpected cathodic role of Mg41Sm5 phase in mitigating localized corrosion of extruded Mg-Sm-Zn-Zr alloy in NaCl solution
- Source :
- Corrosion Science. 159:108133
- Publication Year :
- 2019
- Publisher :
- Elsevier BV, 2019.
-
Abstract
- Effect of Mg41Sm5 second-phase on corrosion of as-cast and extruded Mg-Sm-Zn-Zr alloys in NaCl solution was investigated. The net-like Mg41Sm5 phase played a cathodic role in the as-cast alloy and induced obvious localized corrosion of adjacent anodic α-Mg grains. However, hot-extrusion deformed the relatively large net-like Mg41Sm5 phase into uniformly dispersed finer particles, which effectively mitigated localized corrosion and formed uniform protective film on the whole alloy surface. It enhanced the corrosion resistance of the extruded alloy for three times compared with the as-cast counterpart and outperformed that of benchmark Mg alloy AZ91.
- Subjects :
- Materials science
020209 energy
General Chemical Engineering
Alloy
Metallurgy
Zr alloy
02 engineering and technology
General Chemistry
engineering.material
021001 nanoscience & nanotechnology
Corrosion
Anode
Alloy surface
Cathodic protection
Phase (matter)
0202 electrical engineering, electronic engineering, information engineering
engineering
General Materials Science
0210 nano-technology
Subjects
Details
- ISSN :
- 0010938X
- Volume :
- 159
- Database :
- OpenAIRE
- Journal :
- Corrosion Science
- Accession number :
- edsair.doi...........fa5ff5af2be6e2b8f04a0e018a2d7a6b
- Full Text :
- https://doi.org/10.1016/j.corsci.2019.108133