Vol. 21 No. 1 (2018) Cover Image
Vol. 21 No. 1 (2018)

Published: February 28, 2018

Pages: 74-81

Articles

Corrosion Behavior of Diffusion Bonding Joints of (OFHC) Copper with Stainless Steel 304L in 3.5% NaCl

Sami Abualnoun Ajeel 1 Ahmed Ali Akbar Akbar 1 Safaa Mohammed Hassoni 2
1 Production Engineering and Metallurgy Department, University of Technology, Baghdad, IRAQ
2 Middle Technical University, Institute of Technology, Baghdad, IRAQ
History
  • Received: April 5, 2017
  • Revised: June 7, 2017
  • Accepted: November 5, 2017
  • Available Online: February 10, 2018
DOI

https://doi.org/10.29194/NJES21010074

Abstract

The present work deals with direct diffusion bonding welding without interlayer of austenitic stainless steel type AISI 304L with Oxygen Free High Conductivity pure copper (OFHC) in vacuum atmosphere (1.5 *10-5 mbr.). The optimum bonding conditions are temperature of 650 ?C, duration time of 45 min. and the applied stress of 30 MPa, in order to secure a tight contact between the mating surfaces. The corrosion behavior of diffusion bonding joints in 3.5% Nacl is studied to evaluate the corrosion resistance of welding joints by using Potentiodynamic method. The observed microstructure of corroded specimen of optimum diffusion bonding joint shows that the corrosion current density has low value as compared with base materials used. During polarization, galvanic coupling is observed between two materials used. At passivity region, inverse polarity is occurred at 450mV. Therefore, passive stainless steel 304 L behaves as cathode respective to pure copper, the corrosion behavior of the diffusion bonding joint was mostly by copper side. The corrosion results indicate the presence of galvanic effect. The corrosion current density of copper, stainless steel 304L and bond joints condition were (3.66 µA/cm2, 1.62 µA/cm2 and 1.85µA/cm2) respectively. A SEM examination of corroded diffusion bonding joint indicates that the galvanic corrosion happened on copper side. The corrosion rate of bonding joint conditions was 0.85 mpy, which is less than 1%. This means that corrosion resistance of bond joint is more than excellent.

References

  1. Ziegelhem j., Hiraki S., Diffusion bonding of Similar/dissimilar light metal sheet, Journal of Material Process Technology, (2007)
  2. G. Mahendran, Balasubramania V., “Influences of diffusion bonding process on bond characteristics of Mg-Cu dissimilar joints”, Trans. Nonferrous Metall., (2010).
  3. J. Grum, Slabe J. M,” The use of design and response surface methology for fast determination of optimal heat treatment conditions of different Ni-co-Mo surface roughness layers”, Journal of Material Processing Technology, (2014).
  4. B. Ravisankar, Ramakishnan S.S., Angelo P. C., On diffusion bonding of Ti-6Al-4V, Transactions of Indian Institute of Metals, (2002).
  5. ASTM Handbook,Iron and metal products,vol. 01.01, (1989).
  6. ASTM Handbook,Non-Ferrous metal products,vol. 02.01, (1989).
  7. Ahmed Ali Akber Akber, “Diffusion Bonding of Oxygen High Conductivity Copper to Austenitic Stainless Steel” PhD thesis, University of Technology, (1996).
  8. S.Assarzadeh and Ghoreishi, Statistical Modeling and Optimization of the EDM Parameters on Wc-6% Co Composite through hybrid response surface methodology- desirability function approach, International Journal of Engineering Science and Technology, (2013).
  9. Safaa Mohammed Hassoni, “Characterization of Diffusion Bonding Joints of Oxygen Free High Conductivity (OFHC) Copper with Stainless Steel 304L” PhD. Thesis, University of Technology, (2015).
  10. M. Balasubramanian, Application of Box-Behbken design of fabrication of titanium alloy and 304 stainless steel joints with silver interlayer, Materials and Design, (2015).
  11. ASTM Handbook, Wear and Erosion, vol. 03. 02, G 102, (1999).