Ni对Zr-Cu-Al系非晶合金在NaCl溶液中耐腐蚀性能的影响

The effect of Ni on the electrochemical corrosion behavior of Zr-Cu-Al amorphous alloys in 3.5% NaCl neutral solution was investigated 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 generate 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 are 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.