De-alloying Behavior of Mg-Al alloy in Sulphuric Acid and Acetic Acid Aqueous Solutions

The fabricated Mg-Al alloy consists of α-Mg phase and Mg-Mg Al eutectic phase. The corrosion behavior of cast Mg-Al alloy in sulphuric acid (H SO ) and acetic acid (HAc) aqueous solutions was investigated. The Mg-Al alloy shows general corrosion in H SO solution, and the α-Mg dendrites revealed a sl...

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Published inMaterials Vol. 12; no. 13; p. 2046
Main Authors Li, Yonggang, Wei, Yinghui, Yang, Shengqiang
Format Journal Article
LanguageEnglish
Published Switzerland MDPI AG 26.06.2019
MDPI
Subjects
Acetic acid
acid corrosion
acid solutions
Acids
Alloys
Aluminum
Aqueous solutions
Atmospheric corrosion
Corrosion potential
Corrosion rate
Corrosion resistance
de-alloying
Eutectics
Experiments
Grain orientation
Hydrogen
Magnesium base alloys
Mechanical properties
SEM
Solid solutions
Sulfur
Sulfuric acid
Uniform attack (corrosion)
de-alloying
SEM
acid corrosion
acid solutions
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Summary:The fabricated Mg-Al alloy consists of α-Mg phase and Mg-Mg Al eutectic phase. The corrosion behavior of cast Mg-Al alloy in sulphuric acid (H SO ) and acetic acid (HAc) aqueous solutions was investigated. The Mg-Al alloy shows general corrosion in H SO solution, and the α-Mg dendrites revealed a slightly faster corrosion rate than that of the eutectics. In HAc solution, the alloy shows an obvious selective corrosion characteristic, with the α-Mg dendrites being corroded preferentially. Grain orientation plays an important role in corrosion behavior of the alloy in the HAc solutions.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
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content type line 23
ISSN:1996-1944
1996-1944
DOI:10.3390/ma12132046