超细晶Cu-Cr-Zr合金的腐蚀性能研究
发布时间：2019-05-25 04:28
【摘要】：超细晶材料与粗晶材料相比具有优良的力学性能,但对于其耐蚀性还有待进一步研究。本文采用等通道转角挤压技术(Equal Channel Angular Pressing,简称ECAP)制备了超细晶Cu-Cr-Zr合金,并对其组织性能进行了相应的分析,利用电化学工作站通过Tafel极化曲线以及电化学交流阻抗谱(EIS)重点研究ECAP变形道次、ECAP变形后的时效处理、氯离子浓度、添加硫离子、温度以及酸碱对超细晶Cu-Cr-Zr合金腐蚀行为的影响,取得的主要研究结果如下:(1)经过ECAP变形后的Cu-Cr-Zr合金,晶粒尺寸随着道次的增加不断减小,粗晶时晶粒尺寸约为50~80μm,ECAP变形8道次后晶粒尺寸约为150~200nm。(2)研究不同晶粒度Cu-Cr-Zr合金在0.5mol/L氯化钠溶液中的腐蚀行为,结果表明随着ECAP变形道次的增加,晶粒度减小,其腐蚀电流密度减小,粗晶时的自腐蚀电流密度为2.26μA·cm~(-2),ECAP变形8道次后减小为0.54μA·cm~(-2);通过对其等效电路拟合,扩散过程的传递电阻随道次的增加而增大,由粗晶时的9746Ω增大到ECAP变形8道次的14130Ω,表明电荷在腐蚀介质和电极间转移变难,合金的耐蚀性提高。(3)在0.5mol/L氯化钠溶液中,研究不同热处理状态下的Cu-Cr-Zr合金的腐蚀行为,发现在粗晶状态下,经过时效处理试样的腐蚀性能较好,其自腐蚀电流密度由2.26μA·cm~(-2),经时效处理后减小到2.00μA·cm~(-2);而在ECAP变形8道次时,未进行时效处理试样的耐蚀性远大于时效态,时效处理后的自腐蚀电流密度由未处理的0.54μA·cm~(-2)增加到3.97μA·cm~(-2)。(4)对比分析在不同氯离子浓度下Cu-Cr-Zr合金的腐蚀行为,结果表明随着Cl-浓度的增加,试样的自腐蚀电流增大,其耐蚀性减弱,同时发现浓度越高,浓度变化对耐蚀性的影响越不明显;对比在0.5mol/L氯化钠溶液中添加硫离子时Cu-CrZr合金的腐蚀规律,结果表明超细晶试样较粗晶试样腐蚀产物层更严密,腐蚀速度更小,耐蚀性更好,和同等条件下不含硫离子时相比,耐蚀性更好;对比分析在不同溶液温度下超细晶Cu-Cr-Zr合金的腐蚀行为,发现随着温度的升高,耐蚀性降低。(5)研究Cu-Cr-Zr合金在酸碱中的腐蚀规律,发现在盐酸溶液中,试样的自腐蚀电流密度随溶液浓度的增大而增大,材料的耐蚀性变差;在NaOH溶液中则恰恰相反,试样的自腐蚀电流密度随溶液浓度的增大而减小,材料的耐蚀性增强。且在相同溶液中,超细晶试样较粗晶试样的自腐蚀电流密度更小,显示出较好的耐蚀性。
[Abstract]:Compared with coarse grain materials, ultra-fine grain materials have excellent mechanical properties, but the corrosion resistance of ultra-fine grain materials needs to be further studied. In this paper, ultra-fine grain Cu-Cr-Zr alloy was prepared by equal channel angular extrusion (Equal Channel Angular Pressing, (ECAP), and its microstructure and properties were analyzed. Tafel polarization curve and electrochemical AC impedance spectroscopy (EIS) were used to study the deformation pass of ECAP, aging treatment after ECAP deformation, chloride ion concentration and sulfur ion addition. The effects of temperature and acid and base on the corrosion behavior of ultra-fine grain Cu-Cr-Zr alloy are as follows: (1) the grain size of Cu-Cr-Zr alloy after ECAP deformation decreases with the increase of pass. The grain size is about 50 ~ 80 渭 m when coarse grain is about 50 ~ 80 渭 m, and the grain size is about 150 脳 200 nm after 8 passes of ECAP deformation. (2) the corrosion behavior of Cu-Cr-Zr alloy with different grain size in 0.5mol/L sodium chloride solution is studied. The results show that with the increase of ECAP deformation pass, When the grain size decreases, the corrosion current density decreases, and the self-corrosion current density is 2.26 渭 A cm~ (- 2), ECAP) after 8 passes deformation to 0.54 渭 A cm~ (- 2). By fitting the equivalent circuit, the transfer resistance of diffusion process increases with the increase of pass, from 9746 惟 in coarse grain to 14130 惟 in 8 passes of ECAP deformation, which indicates that the transfer of charge between corrosion medium and electrode is difficult. The corrosion resistance of the alloy was improved. (3) the corrosion behavior of Cu-Cr-Zr alloy under different heat treatment conditions was studied in 0.5mol/L sodium chloride solution. It was found that the corrosion properties of the samples treated by aging were better in coarse grain state. The self-corrosion current density decreases from 2.26 渭 A cm~ (- 2) to 2.00 渭 A cm~ (- 2) after aging treatment. When the ECAP deformation is 8 passes, the corrosion resistance of the sample without aging treatment is much greater than that of the aging state. The self-corrosion current density after aging treatment increased from 0.54 渭 A cm~ (- 2) to 3.97 渭 A cm~ (- 2). (4). The corrosion behavior of Cu-Cr-Zr alloy at different chloride ion concentrations was compared and analyzed. The results show that with the increase of Cl- concentration, the self-corrosion current of the sample increases and its corrosion resistance weakens. At the same time, it is found that the higher the concentration is, the less obvious the effect of concentration change on corrosion resistance is. The corrosion law of Cu-CrZr alloy when sulfur ion was added to 0.5mol/L sodium chloride solution was compared. the results show that the corrosion product layer of ultra-fine grain sample is stricter, the corrosion rate is lower and the corrosion resistance is better than that of coarse grain sample. The corrosion resistance is better than that without sulfur ions under the same conditions. The corrosion behavior of ultra-fine grain Cu-Cr-Zr alloy at different solution temperatures was compared and analyzed. It was found that the corrosion resistance of Cu-Cr-Zr alloy decreased with the increase of temperature. (5) the corrosion law of Cu-Cr-Zr alloy in acid and base was studied and found in hydrochloric acid solution. The self-corrosion current density of the sample increases with the increase of solution concentration, and the corrosion resistance of the material becomes worse. In NaOH solution, on the contrary, the self-corrosion current density of the sample decreases with the increase of solution concentration, and the corrosion resistance of the material increases. In the same solution, the self-corrosion current density of the ultra-fine grain sample is smaller than that of the coarse grain sample, which shows better corrosion resistance.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG172
本文编号：2485488
[Abstract]:Compared with coarse grain materials, ultra-fine grain materials have excellent mechanical properties, but the corrosion resistance of ultra-fine grain materials needs to be further studied. In this paper, ultra-fine grain Cu-Cr-Zr alloy was prepared by equal channel angular extrusion (Equal Channel Angular Pressing, (ECAP), and its microstructure and properties were analyzed. Tafel polarization curve and electrochemical AC impedance spectroscopy (EIS) were used to study the deformation pass of ECAP, aging treatment after ECAP deformation, chloride ion concentration and sulfur ion addition. The effects of temperature and acid and base on the corrosion behavior of ultra-fine grain Cu-Cr-Zr alloy are as follows: (1) the grain size of Cu-Cr-Zr alloy after ECAP deformation decreases with the increase of pass. The grain size is about 50 ~ 80 渭 m when coarse grain is about 50 ~ 80 渭 m, and the grain size is about 150 脳 200 nm after 8 passes of ECAP deformation. (2) the corrosion behavior of Cu-Cr-Zr alloy with different grain size in 0.5mol/L sodium chloride solution is studied. The results show that with the increase of ECAP deformation pass, When the grain size decreases, the corrosion current density decreases, and the self-corrosion current density is 2.26 渭 A cm~ (- 2), ECAP) after 8 passes deformation to 0.54 渭 A cm~ (- 2). By fitting the equivalent circuit, the transfer resistance of diffusion process increases with the increase of pass, from 9746 惟 in coarse grain to 14130 惟 in 8 passes of ECAP deformation, which indicates that the transfer of charge between corrosion medium and electrode is difficult. The corrosion resistance of the alloy was improved. (3) the corrosion behavior of Cu-Cr-Zr alloy under different heat treatment conditions was studied in 0.5mol/L sodium chloride solution. It was found that the corrosion properties of the samples treated by aging were better in coarse grain state. The self-corrosion current density decreases from 2.26 渭 A cm~ (- 2) to 2.00 渭 A cm~ (- 2) after aging treatment. When the ECAP deformation is 8 passes, the corrosion resistance of the sample without aging treatment is much greater than that of the aging state. The self-corrosion current density after aging treatment increased from 0.54 渭 A cm~ (- 2) to 3.97 渭 A cm~ (- 2). (4). The corrosion behavior of Cu-Cr-Zr alloy at different chloride ion concentrations was compared and analyzed. The results show that with the increase of Cl- concentration, the self-corrosion current of the sample increases and its corrosion resistance weakens. At the same time, it is found that the higher the concentration is, the less obvious the effect of concentration change on corrosion resistance is. The corrosion law of Cu-CrZr alloy when sulfur ion was added to 0.5mol/L sodium chloride solution was compared. the results show that the corrosion product layer of ultra-fine grain sample is stricter, the corrosion rate is lower and the corrosion resistance is better than that of coarse grain sample. The corrosion resistance is better than that without sulfur ions under the same conditions. The corrosion behavior of ultra-fine grain Cu-Cr-Zr alloy at different solution temperatures was compared and analyzed. It was found that the corrosion resistance of Cu-Cr-Zr alloy decreased with the increase of temperature. (5) the corrosion law of Cu-Cr-Zr alloy in acid and base was studied and found in hydrochloric acid solution. The self-corrosion current density of the sample increases with the increase of solution concentration, and the corrosion resistance of the material becomes worse. In NaOH solution, on the contrary, the self-corrosion current density of the sample decreases with the increase of solution concentration, and the corrosion resistance of the material increases. In the same solution, the self-corrosion current density of the ultra-fine grain sample is smaller than that of the coarse grain sample, which shows better corrosion resistance.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG172
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