Influence of microalloying additions on Al-Mg alloy. Part 2: Phase analysis and sensitization behaviour

Nazatul Sukiman, R. K. Gupta, R. Zhang, Rudolph G Buchheit, N. Birbilis

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Abstract

A range of alloys based on the Al-4Mg-0.4Mn system were produced with selected quaternary microalloying additions. In Part 1 of this study, the electrochemical and corrosion response was studied. To characterise the sensitisation behaviour of these alloys, where sensitisation is the major mode of degradation of 5xxx alloys, heat treatment at 150°C was carried out and followed by the Nitric Acid Mass Loss Test (NAMLT) according to ASTM G67-04. Herein the alloying elements studied include silicon, zinc, titanium, zirconium and strontium. The results indicate that strontium (Sr), silicon (Si) and titanium (Ti) have a significant influence in reducing intergranular corrosion (IGC) susceptibility.

Original languageEnglish
Pages (from-to)263-268
Number of pages6
JournalCorrosion Engineering Science and Technology
Volume49
Issue number4
DOIs
Publication statusPublished - 2014

Keywords

  • Alloying
  • Aluminium
  • Aluminium alloys
  • Intergranular corrosion
  • Sensitisation

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