The effect of structural heterogeneity on the pitting corrosion behavior of melt-spun amorphous Ni-Zr alloys

摘要

The pitting behavior of amorphous Ni-Zr alloys prepared by melt-spinning was thoroughly investigated by placing and emphasis on the effect of the microstructure and surface composition. It was found that the alloy ribbons showed different pitting corrosion behavior along the thickness direction from the dull side to the shiny side in de-aerated 0.5 M H_2SO_4 solution with 0.1 M NaCl. The dull side surface was most susceptible to pitting corrosion, but it became difficult to occur if the as-prepared dull side surface was removed by mechanical polishing.