不同体系非晶合金电化学腐蚀行为研究

Electrochemical Corrosion Behavior of Amorphous Alloys in Different Systems

研究了Hf_(28)Be_(18)Ti_(17)Zr_(17)Cu_(7.5)Ni_(12.5)、Zr_(41.2)Ti_(13.8)Cu_(12.5)Ni_(10)Be_(22.5)、(Cu_(43)Zr_(48)Al_(9))_(98)Y_(2)3种非晶合金分别在3.5%的NaCl溶液、1 mol/L HCl溶液和1 mol/L的H2SO4溶液中的电化学腐蚀行为,并与304不锈钢进行对比。结果发现,在含Cl^(−)腐蚀液中,3种非晶合金均发生明显腐蚀,其中Hf_(28)Be_(18)Ti_(17)Zr_(17)Cu_(7.5)Ni_(12.5)(Hf_(28)合金)腐蚀程度最低,腐蚀电流密度最小,而Cu基非晶合金发生了严重的腐蚀。在1 mol/L的H_(2)SO_(4)溶液中,3种非晶合金均展现良好的耐蚀性能,腐蚀电流密度均在10^(−7)A/cm^(2)左右,且具有较正的腐蚀电位,表面均无明显腐蚀痕迹。表明非晶合金受Cl^(−)离子侵蚀的影响较大,而在氧化性的腐蚀液中,合金表面极易形成钝化膜,表现出优异的抗腐蚀性能。

Electrochemical corrosion behaviors of Hf_(28)Be_(18)Ti_(17)Zr_(17)Cu_(7.5)Ni_(12.5),Zr_(41.2)Ti_(13.8)Cu_(12.5)Ni_(10)Be_(22.5),and(Cu_(43)Zr_(48)Al_(9))_(98)Y_(2)amorphous alloys in 3.5%NaCl solution,1 mol/L HCl solution,and 1 mol/L H_(2)SO_(4)solution were investigated,and compared with 304 stainless steel.The results reveal that in Cl^(-)containing etchant,significant corrosion occurs in all amorphous alloys,where the corrosion degree and corrosion current density of Hf_(28)alloy are the lowest,while Cu-based amorphous alloys undergo severe corrosion.In 1 mol/L H_(2)SO_(4)solution,all amorphous alloys exhibit desirable corrosion resistance,with corrosion current densities around 10^(-7)A/cm^(2)and positive corrosion potentials.Absence of corrosion trace was observed on the surfaces of alloys,indicating strong impact of Cl^(-)on amorphous alloys,and passivation films were easily formed in oxidizing etchant,proving excellent corrosion resistance of amorphous alloys.