Corrosion behavior of equal-channel-angular-pressed pure magnesium in NaCl aqueous solution

Effect of microstructure change on corrosion behavior of equal-channel-angular-pressed (ECAPed) pure Mg was investigated. The ECAPed sample after 6 passes obtained finer grains (50–100 μm) compared with as-cast one (800–1500 μm). The strain-induced grain refinement with more crystalline defects weak...

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Bibliographic Details
Published inCorrosion science Vol. 52; no. 2; pp. 481 - 490
Main Authors Song, Dan, Ma, AiBin, Jiang, Jinghua, Lin, Pinghua, Yang, Donghui, Fan, Junfeng
Format Journal Article
LanguageEnglish
Published Kidlington Elsevier Ltd 01.02.2010
Elsevier
Subjects
A. Magnesium
Applied sciences
B. EIS
B. Polarization
C. Effects of strain
C. Pitting corrosion
Corrosion
Corrosion environments
Exact sciences and technology
Metals. Metallurgy
A. Magnesium
C. Pitting corrosion
B. EIS
C. Effects of strain
B. Polarization
Pitting corrosion
Magnesium
Aqueous solution
Sodium chloride
Impedance
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Summary:Effect of microstructure change on corrosion behavior of equal-channel-angular-pressed (ECAPed) pure Mg was investigated. The ECAPed sample after 6 passes obtained finer grains (50–100 μm) compared with as-cast one (800–1500 μm). The strain-induced grain refinement with more crystalline defects weakened corrosion resistance of pure Mg, resulting in more and deeper pits after in-situ corrosion, higher mass-loss rate immersed in NaCl solution, larger I corr values in polarization curves and lower fitted R t values in EIS plots. However, the enhanced initial OCP values indicate better weather resistance. Furthermore, corrosion improvement can be expected by reducing defects via subsequent annealing.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2009.10.004