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Influence of annealing temperature on sensitisation behaviour and corrosion properties of an Al‐6.8 wt% Mg alloy
Author(s) -
Radetić T.,
Popović M.,
Jegdić B.,
Romhanji E.
Publication year - 2016
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.201508709
Subject(s) - materials science , grain boundary , annealing (glass) , alloy , faceting , precipitation , metallurgy , corrosion , grain size , microstructure , high temperature corrosion , crystallography , chemistry , physics , meteorology
Influence of annealing temperature on β‐(Al 3 Mg 2 ) phase precipitation and corrosion properties of sensitised Al‐6.8 wt% Mg alloy is investigated. Sensitisation of specimens annealed at 320 °C results in IGC and SCC susceptibility. Microstructural characterization shows fine precipitation of Mg‐rich phase forming nearly continuous film at grain boundaries, despite small precipitated fraction (0.5%), and grain boundary faceting. Sensitised specimens annealed at 265 °C are IGC susceptible, but SCC resistant. Precipitation at grain boundaries is discrete, although the precipitated fraction is greater (3%) than in specimens annealed at 320 °C. Potentiodynamic measurements show that of all measured parameters, charge density is in the strongest correlation with the NAMLT and SSRT results.