【作者】 杜学山；

【导师】 李福山；

【作者基本信息】 郑州大学 ， 材料加工工程， 2005， 硕士

【摘要】 近年来,块状非晶合金的研究取得了重大进展,人们开发出了许多块状非晶合金系列。深入研究块状非晶合金的抗腐蚀性能无论在理论上还是实际中都具有十分重要的意义。本文利用X-Ray衍射仪、热分析、腐蚀测量系统、扫描电境、真空退火炉和电弧炉等设备手段,制备和分析了(Fe₄₀Ni₄₀P₁₄B₆)_100-xGa_x（x=0、2.5和4.5）非晶合金的腐蚀行为、Fe₄₈Cr₁₅Mo_12.5Nd₃Dy_0.5C₁₅B₆块状非晶及其晶化（分别在1024K和1133K退火30min）合金的腐蚀行为和Cu₄₇Ti₃₄Zr₁₁Ni₈块状非晶合金及其晶化（分别在717K和803K退火30min）合金的腐蚀行为。 利用浸泡法和电化学法研究了(Fe₄₀Ni₄₀P₁₄B₆)_100-xGa_x（x=0、2.5和4.5）非晶在3.5%NaCl溶液、1mol/L、3mol/L HCl溶液及1mol/L H₂SO₄溶液中的耐蚀性并测定了非晶的极化曲线。浸泡法结果显示,非晶有非常好的耐蚀能力,在不同腐蚀介质中长时间浸泡非晶合金试样,其失重率很小,表面光洁,不退色。极化曲线显示,而且在同种腐蚀液中,三种不同成分的非晶合金(Fe₄₀Ni₄₀P₁₄B₆)_100-xGa_x（x=0、2.5和4.5）具有不同的腐蚀性能,并且随着Ga的含量增加,腐蚀速率减小、自腐蚀电位增大和维钝电流密度减小,耐蚀性能增大。 利用真空退火炉对Fe₄₈Cr₁₅Mo_12.5Nd₃Dy_0.5C₁₅B₆和Cu₄₇Ti₃₄Zr₁₁Ni₈块状非晶进行退火实验。并用X-Ray和衍射仪DSC分析了退火后非晶组织的变化。结果表明:在高于T_x温度退火时,非晶会明显晶化,晶化过程中有相分离现象。 研究Fe₄₈Cr₁₅Mo_12.5Nd₃Dy_0.5C₁₅B₆块状非晶及其晶化（分别在1024K和1133K退火30min）合金在1mol/L H₂SO₄溶液中的腐蚀行为和Cu₄₇Ti₃₄Zr₁₁Ni₈块状非晶及其晶化（分别在717K和803K退火30min）合金在3.5%NaCl溶液中和1mol/L HCl溶液中的腐蚀行为。结果表明:块状非晶合金相对于晶化合金显示出较好的耐腐蚀性,而发生晶化的合金,随着晶化温度越高,其腐蚀速率增大,耐蚀性能越差。更多还原

【Abstract】 Recently, the studies on bulk amorphous alloys have achieved a great development. It is very important to further study the corrosion behavior of bulk amorphous alloys in theory and application. the electrochemical corrosion behavior of （Fe₄0Ni₄0P₁4B₆）₁00-xGa_x（x = 0,2.5 and 4.5 ） amorphous alloy Fe₄8Cr₁5Mo₁2.5Nd₃-Dy₀.5C₁5B₆ bulk amorphous alloy and their crystallized （annealed 1024K and 1133K in thirty minute） alloys and Cu₄7Ti₃4Zr₁1Ni₈ bulk amorphous alloy and their crystallized （annealed 717K and 803 K in thirty minute） alloys have been investigated by electrochemistry workstation, scanning electron microscope, X-Ray diffraction, DSC and other instruments.The results show that compared with stainless steel, （ Fe₄0Ni₄0P₁4B₆）₁00-xGa_x （ x = 0,2.5 and 4.5 ） amorphous alloy exhibits a better corrosion resistance. Weight loss of the sample is less. The surface is cleaner and does not fade after immerging for a long time. the polarization curves show that the corrosion rate of the amorphous alloys decrease and improves the corrosion resistance and the self-corrosion electric potential of ribbon amorphous alloys with the increase of Ga content in amorphous alloys.The Cu₄7Ti₃4Zr₁1Ni₈ and Fe₄8Cr₁5Mo₁2.5Nd₃Dy₀.5C₁5B₆ bulk amorphous alloy structure transformation annealed in vacuum was analyzed with X-Ray diffraction and DSC thermodynamic measurements. The result shows that the temperature is higher than T_x, the amorphous structure will be crystallized. The different crystalline phases appear.The corrosion behaviors of bulk amorphous Fe₄8Cr₁5Mo₁2.5Nd₃Dy₀.5C₁5B₆ and their crystallized （annealed 1024K and 1133K in thirty minute） forms in 1mol/L H₂SO₄ solution were studied by potentiodynamic polarization experiments and the corrosion behaviors of bulk amorphous alloy Cu₄7Ti₃4Zr₁1Ni₈ and their crystallized （annealed 717K and 803K in thirty minute） forms in 3.5% NaCl and lmol/L HC1 solution were studied by potentiodynamic polarization and weight loss experiments.Compared with the crystallized alloys, the bulk amorphous alloy have better corrosion resistance. The corrosion rate of the crystallized alloys obviously increases and the corrosion resistance of the crystallized alloys decrease with the increasing of temperature.更多还原