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doi:10.5937/str2001047R
Vol.
70, No.1 (2020), Pages: 47-51
Impressum
Contents
Effect of
Sensitization on Corrosion Properties of TIG Welded ALMG Alloy
Ljubica Radović
Jelena Marinković1)
The
effect of sensitization on the intergranular corrosion (IGC) of TIG
welded AlMg6Mn was investigated by means of scanning electron
microscopy (SEM) and corrosion NAMLT tests. The as-received hot
rolled AlMg6Mn alloy plates with a thickness of 8 mm were welded by
TIG welding with S-AlMg5 as a filler material. Specimens were
sensitized at 100 °C for 7 days. It was found that welded specimens
are sensitive to IGC. The. mass loss in NAML test was 106.7 mg/cm2.
The welding increases the susceptibility to IGC, since the mass loss
of the base metal at the same test was 70.7 mg/cm2. The increase of
susceptibility to IGC is attributed to significant continually
precipitated Mg-rich phase along the grain boundaries during the
sensitization treatment
Key words: Al-Mg-Mn alloys, TIG welding, intergranular corrosion (IGC),
sensitization
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