Effect of Ni on corrosion behavior of Zr-Cu-Al amorphous alloys in NaCl solution

Abstract:

It was investigated that the effect of Ni on the electrochemical corrosion behavior of Zr-Cu-Al amorphous alloys in 3.5wt.% NaCl neutral solution by potentiometric polarization and electrochemical impedance spectroscopy.The results show that the Zr₅₅Cu₃₀Ni₅Al₁₀ amorphous alloy containing Ni element has better corrosion resistance than Zr₅₅Cu₃₅Al₁₀ amorphous alloy in NaCl solution.The Zr-Cu-Al amorphous alloys generated pitting corrosion in NaCl solution, and the circular corrosion pit is filled with foam-like holes.Compared with the elemental distribution of Zr-Cu-Al amorphous alloys before and after corrosion, the alloying elements were selectively dissolved because of Cl^_-.Amorphous alloys containing Ni elements form a dense passivation film, which inhibits the selective dissolution of metal elements, thereby improving corrosion resistance. The results can provide reference for the composition design and application of Cl^_- resistant amorphous alloys.