不锈钢电抛光添加剂的研究

通过添加ＢＰ光亮剂，使不锈钢电抛光的质量大大提高，抛光后的表面可达到镜面的光亮度。     

一种新型电抛光电解液

这种新型电抛光电解液可以有效地抛光包括金属钛在内的各种金属以及一些贵金属，电解液可以回收和再生，循环使用其中的有用成分。     

电抛光质量控制要点及冶金缺陷判断

理论与实践相结合,总结归纳出电抛光加工过程中关键参数及重要环节的控制要点。结合行业相关标准及现场实际经验,整理了一套电抛光检验验收判断准则,对电抛光所涉及的各种冶金缺陷的显现特征进行了客观详细的描述。     

W6M05Cr4V2模具钢电化学抛光工艺研究

本文采用电化学方法对W6M05Cr4V2电抛光工艺进行了研究。抛光溶液采用无铬酸盐的磷酸-硫酸体系添加高分子聚乙二醇。研究结果表明，聚乙二醇能有效地形成粘膜，明显提高W6M05Cr4V2电抛光的效果。该工艺减少了环境污染、降低了溶液成本，可以使W6M05Cr4V2表面达到镜面光亮的效果。     

专利实例

电抛光溶液两则　2 0 0 4 30 1 　不锈钢电抛光溶液该电抛光溶液组成为:40 %～80 %的硫酸和磷酸;1 0 %～30 %蛋白质以及含蛋白质化合物3～1 0 0g/L;该溶液中还含有糖类和类脂类。糖类与蛋白质的质量比为0 .1以上。该溶液价格低廉,用于不锈钢表面的电解液抛光,可以大大改善不锈钢表面的粗糙度。(日本专利) 2 0 0 0 0 2 70 0 0 - A ( 2 0 0 0 - 0 1 - 2 5 )2 0 0 4 30 2 　　不锈钢和镍合金电抛光溶液发明了一种适合于抛光不锈钢和镍合金的电解液。该电抛光溶液系一种混合物,其组成为:乙醇酸1 5 2～5 38g/kg;硝酸1 70～5 68g/kg;水2 80～678g…     

碳素钢电抛光工艺研究

筛选了适合于普通碳素钢电抛光的电解液类型即磷酸－铬酐型,并通过正交试验,得到了最佳电抛光工艺,并对普通碳素钢抛光前后的表面形态和成分进行了分析。结果表明,磷酸与铬酐的摩尔和电流密度是影响电抛光工艺的两个主要因素,普通碳素钢表面的元素Ｆｅ以两种形态存在,并且其表面成分与内部成分是有区别的。     

W6Mo5Cr4V2模具钢电化学抛光工艺研究

采用电化学方法对W6Mo5Cr4V2电抛光工艺进行了研究。抛光溶液采用无铬酸盐的磷酸-硫酸体系,添加高分子聚乙二醇。抛光溶液组成为H3P04（85％）500gH2SO4硫酸（98％）130g聚乙二醇130g甘油30g工艺条件：75—95℃阳极电流密度8—15A．dm^-2研究结果表明，聚乙二醇能有效地形成粘膜，明显提高W6M05Cr4V2电抛光的效果，该工艺减少了环境污染。降低了溶液成本，可以使W6M05Cr4V2表面达到镜面光亮的效果。     

不锈钢电抛光工艺的研究

采用电化学方法对不锈钢电抛光工艺进行了研究.抛光溶液采用无铬酸盐的磷酸-硫酸体系,添加高分子聚乙二醇.抛光溶液组成为H3PO4(85%) 500 g,硫酸(98%) 130 g,聚乙二醇(18.5%水溶液)130 g,甘油30 g.工艺条件为:75～95 ℃,阳极电流密度8～15 A·dm-2.研究结果表明,聚乙二醇能有效地形成粘膜,明显提高不锈钢电抛光的效果.该工艺减少了环境污染,降低了溶液成本,可以使不锈钢表面达到镜面光亮的效果.本文还分析了抛光后钝化膜对不锈钢耐蚀性能的影响.     

无接触电解抛光

本文介绍的无接触电解抛光方法是以让阳极和阴极面向工件,而工件并没有与电源相连接的方式进行电解抛光的方法。文中列举了这种电抛光效率的数据,并指出面向阴极的表面之抛光效率取决于电解液的导电率和电极的位置。这种方法应用于连续性的带材和线材的电解抛光相当有效。     

常见几种金属的电化学抛光

0前言电化学抛光(简称电抛光)是金属工件表面进行精整加工的重要方法之一。它是以工件作为电解槽的阳极,用耐电解液腐蚀的金属材料铅或不锈钢作阴极,在直流电作用下,使工件表面粗糙度降低并产生光泽外观的一种特殊的阳极过程。电抛光可以作为金属镀前的准备工序,也可作为对金属件独立加工的工艺。例如:模具型腔电抛光后可以增加硬度,     

Electropolishing of AISI-304 stainless steel using an oxidizing solution originally used for electrochemical coloration

Chemical polishing or electropolishing, instead of mechanical polishing, are recommended for the attainment of metallic surface polishes without the introduction of contaminants or tensions in the surface layers of the metal. The fundamental difference between the chemical and electrochemical polishing processes is that in the latter anodic currents/potentials are used to help in the dissolution and passivation of the metal. In this paper, the use of an oxidizing electrolytic solution (2.5 mol L⁻¹ CrO₃ + 5.0 mol L⁻¹ H₂SO₄) originally employed in electrochemical coloration processes is reported for the electropolishing of AISI-314 stainless steel. Parameters involved in this electropolishing process, such as temperature, current density and time, were optimized so as to attain the best possible results evaluated by the obtained surface brightness measured by reflectance spectra. Surface analyses by scanning electron microscopy allowed a clear correlation between obtained brightness and surface smoothing. The best conditions obtained for the electropolishing process are: temperature of 45 °C, electrolysis time of 10 min and current density of around 25 A dm⁻². It should be pointed out that an electropolishing process signature (periodic oscillations of the cell potential) was established; this may be an important tool for optimizing and monitoring electropolishing processes.     

Diffusion and migration in the electropolishing and anodic dissolution of metals

The solution of the Nernst-Planck equation for the electropolishing of metals is presented. The migration and diffusion equations are solved for the cases where the metal ion is transported independently of the anion of the electrolyte and when ion pairing occurs. It is concluded that under polishing conditions, the surface concentration of acid is decreased by the salt solubility. It is shown that this has important practical consequences for defining the conditions required for electropolishing and in the selection of the acid used.     

Rotating disc electrode study of the electropolishing mechanism of NiTi in methanolic sulfuric acid

The mechanism during electropolishing of NiTi in methanolic 3 M sulfuric acid is elucidated based on the investigations carried out using a rotating disc electrode (RDE). The influence of the rotation rate, temperature and the addition of Ni and Ti ions in solution on the dissolution kinetics are investigated and analysed. The dissolution of NiTi during electropolishing exhibits Levich behaviour confirming mass transport as the rate-limiting step. The temperature dependence shows a typical Arrhenius behaviour and the activation energy for dissolution is E_a = 19.2 (±1.33) kJ mol⁻¹. The addition of metal ions to the electropolishing solution results in a lower limiting current density for both, Ni²⁺ and Ti⁴⁺ addition. This confirms the mass transport of dissolved species from the anode surface to the bulk of the solution as the rate-determining step.     

Electropolishing of chromium in phosphoric acid-sulphuric acid electrolytes

The anodic dissolution of chromium in phosphoric acid-sulphuric acid electropolishing electrolytes has been investigated using a rotating disc electrode. The influence of electrolyte composition on mass transport and the resulting surface finish has been investigated. It was found that electropolishing of chromium occurs in the transpassive potential region under mass transport control. The transport limiting species is the anodically generated hexavalent chromium ion. The rate of nucleation of the anodic film present is potential dependent, and film instabilities occur in a certain potential region of the limiting current plateau.     

钢铁材料电解抛光技术

介绍了钢铁材料槽式电解抛光和槽外刷涂式电解抛光技术,概述了电解抛光技术的原理,工艺,设备,配方以及影响抛光质量的因素。     

铝合金无铬电化学抛光研究

采用紫外光谱和电化学测试方法,研究铝合金无铬电化学抛光添加剂、配方、工艺,其抛光效果优于铬酸电化学抛光,是一项有应用前景的新工艺。     

Smoothening of niobium by electropolishing

The effects of various electropolishing (EP) parameters such as duration, applied voltage, working temperature, mechanical prepolishing and acid volume ratio on the EP process, and surface smoothness of high purity niobium (Nb) were systematically investigated using electrochemical technique and optical profilometry. The electropolishing parameters had a significant influence on the smoothness of the Nb by controlling the current density. Prolonged EP duration caused different dissolution rates of grains. Applied voltages above the oxygen evolution potential resulted in severe pitting of the Nb. High working temperature-caused roughening of the Nb surface via different dissolution rates of grains and mechanically ground smooth surfaces were roughened by the formation of valleys on the surfaces. A lower fluoride ion concentration in the acid solution gave rise to a rougher surface of the Nb because the fluoride ions were transport-limited species during the EP process.     

On the role of the anions on the anomalous anodic dissolution of aluminium

The influence of the anions on current efficiency during the anodic dissolution of aluminium, and on the surface state of the electrode, has been studied both from a theoretical and an experimental point of view. The results obtained have some implications both in the field of electropolishing and in the field of electrochemical machining.     

The influence of mass transfer on the mechanism of electropolishing of nickel in aqueous sulphuric acid

The effect of mass transfer on the electropolishing of nickel in sulphuric acid solutions has been studied using a rotating disc electrode technique. Two well defined regions for different rotation rates have been observed having (a) pure diffusion control, and (b) mixed kinetic and diffusion control. The presence of a solid layer of a hydrated nickel salt covering a contaminated oxide layer is proposed. The rate of chemical attack of the underlying layer appears to depend on the SO^2?₄ ion concentration for H₂SO₄ concentrations greater than 8 M. When the rate of mass transfer is increased, changes in the morphology of the surface are observed, polishing gives way to levelling, and finally either to metallographic etching or corrosion. The disappearance of electropolishing is observed in general when the rate of mass transfer is sufficient to eliminate from the surface the solid layer of hydrated nickel sulphate, and the results indicate a coupling between diffusional rates in the solution and ionic transport through the oxide or contaminated oxide phases.