Ni对Zr-Cu-Al系非晶合金在NaCl溶液中耐腐蚀性能的影响

Effect of Ni on Corrosion Behavior of Zr-Cu-Al Amorphous Alloys in NaCl Solution

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3.5%NaCl(质量分数)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Zr_(55)Cu_(30)Ni_(5)Al_(10)比Zr_(55)Cu_(35)Al_(10)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。

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 Zr_(55)Cu_(30)Ni_(5)Al_(10) amorphous alloy containing Ni element has better corrosion resistance than Zr_(55)Cu_(35)Al_(10) 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.