Ni对Zr-Cu-Al系非晶合金在NaCl溶液中腐蚀性能的影响

利用动电位极化和电化学阻抗谱研究了Ni元素对Zr-Cu-Al系非晶合金在3.5wt.%NaCl中性溶液中的电化学腐蚀行为的影响规律。结果表明：含Ni元素的Zr₅₅Cu₃₀Ni₅Al₁₀比Zr₅₅Cu₃₅Al₁₀非晶合金在NaCl溶液中具有更优异的耐腐蚀性能。Zr-Cu-Al系非晶合金在NaCl溶液中发生点腐蚀,圆形腐蚀坑内布满泡沫状孔洞。通过腐蚀前后的元素分布对比,发现Zr-Cu-Al非晶合金在Cl^_-作用下合金元素选择性溶解。含Ni元素的非晶合金形成致密的钝化膜,抑制了金属元素的选择性溶解,从而提高了耐腐蚀性能。研究结果可为耐Cl^_-环境腐蚀非晶合金成分设计及其应用提供参考。

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

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.