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Microstructural and Corrosion Properties of Ti-to-Zr Dissimilar Alloy Joints Brazed with a Zr-Ti-Cu-Ni Amorphous Filler Alloy

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Abstract
Titanium and Zircaloy-4 dissimilar alloys were brazed with a zirconium-titanium-copper-nickel amorphous filler alloy, and the resulting joint structures as well as their corrosion properties were examined. The microstructure of the brazed joints was investigated according to brazing holding time at 850 C, and the corrosion property was analyzed by potentiodynamic polariza-tion. During brazing, joints were produced by diffusion-induced isothermal solidification of the molten filler alloy. At a relatively brief brazing holding time of 5 min, a large segregation zone consisting of an active alpha-phase and a nobler intermetallic phase was generated in the joint center, which suffered from micro-galvanic corrosion. The presence of alloyed titanium deteriorated the nobility of the alpha-zirconium phase near the joint and induced galvanic coupling with cathodic base metals, resulting in massive localized corrosion. This localized corrosion caused the pitting behavior at the applied potential of ?51.1 ~ 187.5 mV during anodic polarization. With a brazing holding time of 20 min, the concentration of the alloying elements was homogenized to elimi-nate the electrochemical potential difference and minimize the galvanic corrosion susceptibility of the joint region. This homogeneous joint resulted in a highly passive corrosion behavior comparable to that of the titanium base metal.
Author(s)
이시영이현준백종희박성수이정구
Issued Date
2021
Type
Article
Keyword
titaniumZircaloy-4brazingdissimilar jointamorphous filler alloymicrostructurecorrosion
DOI
10.3390/met11020192
URI
http://oak.ulsan.ac.kr/handle/2021.oak/8960
https://ulsan-primo.hosted.exlibrisgroup.com/primo-explore/fulldisplay?docid=TN_cdi_doaj_primary_oai_doaj_org_article_1abf976f11224a52901f5c3f4a152ca7&context=PC&vid=ULSAN&lang=ko_KR&search_scope=default_scope&adaptor=primo_central_multiple_fe&tab=default_tab&query=any,contains,Microstructural%20and%20Corrosion%20Properties%20of%20Ti-to-Zr%20Dissimilar%20Alloy%20Joints%20Brazed%20with%20a%20Zr-Ti-Cu-Ni%20Amorphous%20Filler%20Alloy&offset=0&pcAvailability=true
Publisher
METALS
Location
스위스
Language
영어
ISSN
2075-4701
Citation Volume
11
Citation Number
2
Citation Start Page
192
Citation End Page
192
Appears in Collections:
Engineering > Material Engineering
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