铅基合金阳极表面改性的研究

发布时间：2018-02-25 05:22

本文关键词： 铅基合金腐蚀钝化电沉积锌　出处：《贵州大学》2015年硕士论文　论文类型：学位论文

【摘要】：锌是日常生活中重要的有色金属之一。现今,Zn在有色金属市场的消费仅次于Cu和Al,属于第三大经济有色金属。金属Zn具有金属光泽,优良的压延性、耐磨性以及抗腐蚀性,能与其他金属制成优良的合金,包括物理与化学等性能。湿法冶金是冶锌的主要方法,湿法冶炼具有生产效率高、生产能力大、操作条件方便、污染小和有价金属综合回收好等优点,所以湿法炼锌已被炼锌工业广泛采用。在锌电沉积中,阳极材料的选用,直接影响电积过程中的电能的消耗和阴极上锌的质量。通常情况下电极材料应该满足以下基本要求:(1)优良的导电性;(2)耐腐蚀性强;(3)机械强度和加工性能好;(4)寿命长;(5)对电极反应具有良好的电催化性能。本文分别研究铅基合金阳极有钝化膜和无钝化膜的情况下,采用金相显微镜,极化曲线,扫描电镜等方法进行研究,表明:1.相同温度下,在20%的硫酸溶液中铅基合金的腐蚀速率为0.37x10-5 g/(mm2·h),30%的硫酸溶液中铅基合金的腐蚀速率为0.43x10-5 g/(mm2·h),40%的硫酸溶液中铅基合金的腐蚀速率为0.50 x10-5 g/(mm2·h),50%的硫酸溶液中铅基合金的腐蚀速率为0.51 x10-5 g/(mm2·h),说明随着硫酸溶液浓度的增加,铅基合金的腐蚀越严重。2.无钝化膜的铅基合金在溶液中自身腐蚀,自身形成钝化膜的速度随着溶液浓度的增加而增加,自身腐蚀,对铅基合金造成腐蚀;3.在相同温度下相同浓度下,有钝化膜的铅基合金的腐蚀电位Ecorr=-419.7m V,腐蚀电流Icorr=11.247μA,没有钝化膜的铅基合金的腐蚀电位Ecorr=-396.2543mV,腐蚀电流Icorr=1.516μA,说明钝化剂在铅基合金表面有一定的耐腐蚀性。
[Abstract]:Zinc is one of the most important nonferrous metals in daily life. The consumption of zinc in the nonferrous metal market is second only to that of Cu and Al, and it is the third largest economic non-ferrous metal. Hydrometallurgy is the main method of zinc smelting. Hydrometallurgy has the advantages of high production efficiency, large production capacity and convenient operation conditions. Due to the advantages of low pollution and good recovery of valuable metals, hydrometallurgical zinc smelting has been widely used in zinc smelting industry. It directly affects the consumption of electric energy and the quality of zinc on cathode during electrodeposition. In general, the electrode material should meet the following basic requirements: 1) excellent electrical conductivity. In this paper, the passivation film and the non-passivation film of lead based alloy anode are studied, respectively. By means of metallographic microscope, polarization curve, scanning electron microscope and other methods, it is shown that at the same temperature, In 20% sulphuric acid solution, the corrosion rate of lead-based alloy is 0.37 x 10-5 g / mm2 路hm2 路hm-2 + 30% in sulfuric acid solution, and the corrosion rate of lead-based alloy in sulfuric acid solution is 0.43x10-5 g / mm2 路hm2 路hl0% in sulfuric acid solution, and the corrosion rate of lead-based alloy in sulfuric acid solution is 0.50x10-5 g / mm2 路hmm2 路hmht50%. The rate is 0.51 x 10 ~ (-5) g / m ~ 2 路hm ~ 2 路h ~ (-1), which indicates that with the increase of sulfuric acid concentration, The more serious the corrosion of lead-based alloy is, the more serious is the corrosion of lead-based alloy without passivation film in solution. The rate of formation of passivation film increases with the increase of solution concentration. Corrosion of lead-based alloys. At the same temperature and at the same concentration, The corrosion potential of lead-based alloy with passivation film is Ecorr=-419.7m V, the corrosion current is Icorr=11.247 渭 A, the corrosion potential of lead-based alloy without passivation film is Ecorr-396.2543mV, and the corrosion current is Icorr=1.516 渭 A. it is concluded that the passivator has a certain corrosion resistance on the surface of lead-based alloy.
【学位授予单位】：贵州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG178

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