Abstract
Aluminum alloy (AA)6061 (UNS A96061) and AA4047 (UNS A94047) were brazed to construct a tapered model braze joint with variable braze clearances. Isolated AA6061-T6 was also exposed to the thermal cycle of a typical dip brazing process without applying filler metal. The braze, mixed, and heat-affected zones were modeled by thermochemical computations and characterized experimentally. Corrosion exposures were conducted in accordance with BS 11846 Method B for detection of intergranular corrosion (IGC). Each zone developed its own corrosion morphology traced to the unique chemical composition and metallurgical characteristics. The brazing thermal cycle promoted IGC of isolated AA6061. Moreover, the Al-Si braze and AA6061 joint promoted additional intergranular corrosion in the Si-enriched mixed zone exacerbated by grain boundary Q (Al4Cu2Mg8Si7) and β phases as well as eutectically formed Si needles at solidification boundaries. Pitting occurred in the Al-Si braze zone. Anodic and cathodic polarization scan...
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
