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Poster

WEB Corrosion resistance of a Ni-based brazing alloy in a marine atmospheric exposure

Friday (28.02.2020)
07:47 - 07:47 Poster Room
Part of:
Line-Up:
- Poster *web*Investigations of Medieval Zwischgold Samples by means of Transmission Electron Microscopy 1 Dr.-Ing. Julian Müller
- Poster *web*Evolution of bimodal L12 (γ') phase distribution and its effect on mechanical properties in nickel-based alloy 718Plus 1 Barun Bharadwaj Dash
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- Poster *web*Benefits of evaluating coatings in real marine enviroment 1 Dipl.-Ing. Aiala Urbegain Garate
- Poster *web*Agglomeration of gold nanoparticles under microgravity conditions 1 Andrea Pyttlik
- Poster *web*Corrosion resistance of a Ni-based brazing alloy in a marine atmospheric exposure 1 Dipl.-Ing. Aiala Urbegain Garate
- Poster *web*Modelling of copper particle – copper wall collision at high velocities 1 Giedrius Jocbalis
- Poster *web*Impact of Strain Tensor on the Microstructure Evolution of Al-Sc-Zr-based Alloy 1 Bengü Tas Kavakbasi
- Poster *web*Template assisted synthesis of mesoporous Pt thin films and their use as electrocatalyst for the oxidation of glycerol 1 Ph.D. Athira Anil
- Poster *web*Structural and Magnetic Characterization of Iron Oxide Nanoparticles upon Chemical Lithiation 1 Seda Ulusoy
- Poster *web*Correlation between electrical and mechanical properties of silver nanowire electrodes studied by complementary in situ microscopy techniques 1 Marco Moninger
- Poster *web*Crack process evaluation in carbon fibre reinforced polymers aged by thermal cycling 1 Prof. Dr.-Ing. Fernando Lasagni

Session -C: Characterization
Belongs to:
Topic X: Poster Session


The corrosion behaviour of a Ni-based brazing alloy after a seven-month exposure in a marine atmospheric test site was investigated. The Ni-20Cr-5.6Fe-5.4-B filler metal was deposited by brazing on a superduplex stainless steel. “Real” marine exposure provides more realistic conditions than traditional salt spray or humidity conditions, including both wet and dry environments.

Unexpected pitting corrosion was observed in the Ni-based filler metal. The microstructure of the Ni layer was analysed by optical and SEM microscopy, carrying out EDS analyses of the variety of phases with different morphologies and compositions generated by the brazing process. A significant corrosion damage was detected across certain acicular phases enriched in silicon and with a significant chromium depletion (about 5 wt. %), responsible for the decrease of the pitting corrosion resistance of these phases. It is not discarded also the formation of galvanic microcells between the Cr-depleted anodic zone and the surrounding uncorroded cathodic zone, enriched in chromium.

It was concluded that the brazing process produces a microstructure susceptible to pitting corrosion in the marine atmospheric environment.

Speaker:
Dipl.-Ing. Aiala Urbegain Garate
Fundacion Tecnalia Research and Innovation
Additional Authors:
  • Dr. Virginia Madina Arrese
    Fundación Tecnalia Research and Innovation

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