Corrosion behavior of stainless steel-tungsten carbide joints brazed with AgCuX (X = In, Ti) alloys

Abstract

We studied the long-term corrosion behavior of carbide/316L stainless steel joints brazed with AgCuX alloys (X = Ti, In). The results show that the Cu-based solid solution (Cu (s,s)) in the brazing alloy is the weak link of corrosion germination. Ti increases the Fermi level and decreases the *H adsorption energy (ΔG*H) of Cu(s,s), thus leading to a higher thermodynamic tendency of hydrogen evolution. In contrast, In decreases the Fermi level and the d band center of Cu (s, s) leading to a positive ΔG*H, which improves the corrosion resistance. The results agree with the mechanical performance tests.