本文關鍵詞： 鉛基合金 腐蝕 鈍化 電沉積鋅　出處：《貴州大學》2015年碩士論文　論文類型：學位論文

【摘要】：鋅是日常生活中重要的有色金屬之一。現(xiàn)今,Zn在有色金屬市場的消費僅次于Cu和Al,屬于第三大經(jīng)濟有色金屬。金屬Zn具有金屬光澤,優(yōu)良的壓延性、耐磨性以及抗腐蝕性,能與其他金屬制成優(yōu)良的合金,包括物理與化學等性能。濕法冶金是冶鋅的主要方法,濕法冶煉具有生產(chǎn)效率高、生產(chǎn)能力大、操作條件方便、污染小和有價金屬綜合回收好等優(yōu)點,所以濕法煉鋅已被煉鋅工業(yè)廣泛采用。在鋅電沉積中,陽極材料的選用,直接影響電積過程中的電能的消耗和陰極上鋅的質(zhì)量。通常情況下電極材料應該滿足以下基本要求:(1)優(yōu)良的導電性;(2)耐腐蝕性強;(3)機械強度和加工性能好;(4)壽命長;(5)對電極反應具有良好的電催化性能。本文分別研究鉛基合金陽極有鈍化膜和無鈍化膜的情況下,采用金相顯微鏡,極化曲線,掃描電鏡等方法進行研究,表明:1.相同溫度下,在20%的硫酸溶液中鉛基合金的腐蝕速率為0.37x10-5 g/(mm2·h),30%的硫酸溶液中鉛基合金的腐蝕速率為0.43x10-5 g/(mm2·h),40%的硫酸溶液中鉛基合金的腐蝕速率為0.50 x10-5 g/(mm2·h),50%的硫酸溶液中鉛基合金的腐蝕速率為0.51 x10-5 g/(mm2·h),說明隨著硫酸溶液濃度的增加,鉛基合金的腐蝕越嚴重。2.無鈍化膜的鉛基合金在溶液中自身腐蝕,自身形成鈍化膜的速度隨著溶液濃度的增加而增加,自身腐蝕,對鉛基合金造成腐蝕;3.在相同溫度下相同濃度下,有鈍化膜的鉛基合金的腐蝕電位Ecorr=-419.7m V,腐蝕電流Icorr=11.247μA,沒有鈍化膜的鉛基合金的腐蝕電位Ecorr=-396.2543mV,腐蝕電流Icorr=1.516μA,說明鈍化劑在鉛基合金表面有一定的耐腐蝕性。
[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.
【學位授予單位】：貴州大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TG178

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本文編號：1533170