De-alloying corrosion in the heat-affected zone in Mn-Al bronze weld
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Author list: Punburi P., Tareelap N., Srisukhumbowornchai N., Yordsri V.
Publisher: Elsevier
Publication year: 2018
Journal: Materials Chemistry and Physics: Including Materials Science Communications (0254-0584)
Volume number: 212
Start page: 471
End page: 478
Number of pages: 8
ISSN: 0254-0584
Languages: English-Great Britain (EN-GB)
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Abstract
This study reports on de-alloying corrosion in a heat-affected zone (HAZ) of marine propeller Mn-Al bronze. The HAZ consisted of α, β∗ phases and a 2–5 μm thick α/β∗ interface layer. The β∗ phase having high aluminium content was expected to corrode first, it found that the de-alloying initiated from the α/β∗ interface layer. TEM diffraction patterns and images showed Cu3Mn2Al and orthorhombic L-J precipitates in Cu2MnAl matrix plus numerous dislocations and strain fields, which caused the layer to be corroded first. This study suggests that microstructure is a critical factor for corrosion more than the highly reactive aluminium content. © 2018 Elsevier B.V.
Keywords
Overlay welding, Precipitations
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