No abstract

This work presents a study of the corrosion resistance as a function of the holding time on the interface generated during the process of brazing an AISI 304 to AISI 316L stainless steels by using a non-commercial Fe60Ni12Cr8P13B7 metallic glass alloy ribbon by induction heating at 1000 °C into a chamber with an Ar controlled atmosphere. Samples of the austenitic stainless steels were joined in a sandwich-like arrangement using the Fe-based metallic glass ribbon. Corrosion experiments carried out in distilled water and 3.5 wt. % sodium chloride solution revealed that the corrosion resistance was higher for samples tested in the distilled water than the latest medium for all dwell joining times, since in the former medium the samples passivated. It was also found that the highest corrosion resistance was achieved for samples joined for a dwelling time of 4 minutes.

The effect of holding time on the microstructure and corrosion resistance of the junction zone of AISI 316L bonded to AISI 304 stainless steels (SSs) at 960uC using an Fe based alloy filler was investigated. Samples of austenitic SSs were joined in a sandwich-like arrangement using noncommercial Fe 60 Ni 12 Cr 8 P 13 B 7 metallic glass ribbon. Microstructural analysis revealed significant dissolution of the amorphous ribbon in both SSs for short holding times, exhibiting a narrow interlayer with very fine precipitates. Larger holding times induced widening of the interlayer and coarsening of c precipitates in the iron based alloy and significant variation of the interlayer chemical composition. Microstructural dissimilarity of the bonding zone promoted selective dissolution coupled with crevice corrosion of the joints in 3?5 wt-% sodium chloride solution. In general, at the joining temperature of 960uC, the bonding ribbon and the AISI 316L SS presented higher corrosion resistance as the holding time increased up to 20 min.