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Role of second phase particles in pitting corrosion of 3003 Al alloy in NaCl solution
Author(s) -
Liu Y.,
Cheng Y. F.
Publication year - 2010
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.200905308
Subject(s) - alloy , materials science , scanning electron microscope , pitting corrosion , intermetallic , dissolution , metallurgy , phase (matter) , corrosion , substrate (aquarium) , galvanic cell , polarization (electrochemistry) , analytical chemistry (journal) , chemical engineering , composite material , chemistry , oceanography , organic chemistry , chromatography , engineering , geology
Abstract The second phase particles in 3003 aluminum (Al) alloy were characterized by scanning electron microscope, energy‐dispersive X‐ray analysis and X‐ray diffraction techniques. The role of second phase particles in Al alloy pitting corrosion was investigated by cyclic polarization measurement, and scanning vibrating electrode technique. Results demonstrated that the second phase particles in 3003 Al alloy are mainly Al x (Fe,Mn) intermetallics, with an average diameter of about 5 µm. The enrichment of Mn in second phase particles forms a galvanic cell effect relative to the adjacent Al alloy substrate. The initiation of pitting corrosion of 3003 Al alloy is the local dissolution of Al substrate around the second phase particles. When a sufficient amount of Al is dissolved away, the second phase particles drop off from the Al substrate, forming large pitting cavities that are usually linked each other.