Pitting Corrosion of Amorphous Ni-Zn Alloys in Chloride Ion Containing Sulfuric Acid Solutions

摘要

The pitting corrosion behavior of the melt-spun amorphous Ni-Zr alloys with 30-75 at/100 zirconium, the crystalline arc-melted counterparts and the sputter-deposited Ni-Zr alloys with 20-84 at/100 zirconium was examined by electrochemi- cal measurements in deaerated 0.5 kmol/m~3 H_2SO_4 with and without 0.1 kmol/m~3NaCl at 303 K. In the sulfuric acid so- lution without Cl-, these alloys were spontaneously passive and their potentiodynamic behavior was similar to each other. In the Cl-containing solution, all the melt-spun amorphous alloys suffered pitting during anodic polarization and the pitting potential decreased with an increase in zirconium content.