ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The corrosion behavior of cold worked Al-Mg-Sc-Zr-Ni alloys prepared by vacuuminduction melting in acidic chloride solution was studied. The morphological characteristics of thecorroded specimens were examined by OM(optical microscopy), SEM[removed info]and EDX techniques. Theresults indicated that the intergranular and exfoliation corrosion susceptibility dramatically dependedon the Ni content. The Al-Mg-Sc-Zr alloy with 0 and 0.5 wt.% Ni were lightly susceptible tointergranular corrosion as the precipitation of Mg2Al3 phases presented at grain boundaries and theAl3Ni particles were finely dispersive. The intergranular corrosion was enhanced by the Al3Niparticles enrichment and became pitting corrosion with increasing Ni to 1.0 wt.%. Finally, theexfoliation corrosion happened to the alloy with 2.0wt.% Ni. This trend correlated well with theelectrochemical property and distribution of Al3Ni phases. The corrosion potential of Al3Niintermetallic phase is nobler than the β phase and the matrix, which result in an appearance ofgalvanic coupling. In addition, the increase of Al3Ni particles enlarged the attack area and theinhomogeneous segments of Al3Ni and Al3Mg2 phases accelerated the localized corrosion
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.1123.pdf
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