铝周期换向脉冲电解着色

研究了周期换向脉冲电源的工作比、频率等对铝电解着色的影响，并对着色效果进行了评价，采用周期换向脉冲电源进行电解着色优于交流电解着色。     

铝及铝合金电解抛光工艺实践

提出了铝及其合金的配性电解抛光液，分析了各组分的作用及工艺参数。     

铝材碱性电解抛光工艺的研究

针对铝材酸性电解抛光工艺废水污染严重的问题,对碱性电解抛光工艺进行了研究,并确定了碱性电解抛光中各种药品的用量及运行条件。结果表明:碱性电解抛光技术在一定程度上能够满足铝材抛光的需求。通过实验,获得了抛光效果好、使用寿命长、无磷的抛光液。     

铝及铝合金无铬电解抛光

传统的铝及铝合金电解抛光含有严重污染环境的铬酸，新开发的无铬电解抛光工艺采用了丙二醇代替铬酸后解决了六价铬对环境污染的问题，而活性酸、醚类化合物的添加使其光亮度优于传统的含铬电解抛光，该工艺具有成本低、速度快、寿命长的优点。     

铝和铝合金的碱性抛光及着色工艺研究

通过试验找到一种碱性化学抛光工艺，介绍了影响抛光质量的各种因素。还提出了８种颜色的化学着色配方与封闭处理的工艺。     

不锈钢电解抛光

我厂有部分不锈钢零件,形状复杂。成份为１Ｃｒ１８Ｎｉ９Ｔｉ及４Ｃｒ１３、经机加工后,工件表面灰暗无光、微观凹凸不平、光洁度较差。而机械抛光有一定的局限性,有些部位无法进行机械抛光。用电化学抛光取代机械抛光,既提高了生产效率,还提高了工件的表面光洁度,使之达到镜面光洁度,取得了良好的效果。１　工艺流程上挂具电解除油流动水洗酸蚀水洗电解抛光水洗钝化水洗热水洗干燥检验２　溶液配方及操作条件２．１　电解除油ＮａＯＨ,ｇＬ５０～７０Ｎａ２ＣＯ３,ｇＬ２０～３０Ｎａ３ＰＯ４,ｇＬ５０～７０Ｎａ２ＳｉＯ…     

镁合金电解抛光工艺

采用高氯酸–无水乙醇溶液对AZ31镁合金进行电解抛光。以抛光过程中的电流密度、抛光样品的失重和反光率为性能指标,研究了抛光液中的高氯酸含量和抛光电压对抛光效果的影响。得到电解抛光的最佳工艺为:高氯酸与无水乙醇的体积比1∶9,抛光电压7 V(电流密度2.465 A/dm2),抛光温度0°C,抛光时间5 min。采用最佳工艺抛光后,样品的反光率可达91%。该工艺成本较低,可采用冰水混合物控温,有望在生产(尤其是电子背散射衍射样品的制备)中推广和应用。     

铝件碱性化学抛光工艺

采用碱性化学抛光工艺可达到与三酸抛光液相同的性能,抛光质量符合标准,成本降低40%以上.介绍了溶液成份和各种因素的影响.     

铝阳极氧化碱蚀槽的维护

在铝合金阳极氧化生产工艺中，测定碱蚀槽液苛性钠、铝离子、添加剂的浓度。根据铝合金碱蚀工艺条件和铝材碱蚀后的表面状况，对碱蚀槽的槽液进行维护，提出了碱蚀常见故障和排除方法。本文还探讨了碱蚀机理。     

Influence of alloying additives on the performance of commercial grade aluminium as galvanic anode in alkaline zincate solution for use in primary alkaline batteries

The self-corrosion of different grades of commercial aluminium such as 2S, 3S, 26S and 57S in 4 M NaOH containing 0.6 M ZnO has been determined by weight loss measurements. It is found that 26S and 57S aluminium exhibit negligible corrosion rates in the range 0.05–0.06 mg cm^–2 min^–1, which can be attributed to the formation of a zincate coating on the aluminium surface. The influence of zincating on the performance of binary and ternary alloys of 26S and 57S aluminium obtained by incorporating alloying elements such as zinc, indium, thallium, gallium and tin as galvanic anode in 4 M NaOH containing 0.6 M ZnO has been examined by studying self corrosion, steady state open circuit potential, galvanostatic polarization and anode efficiency. It is found that zincated ternary alloys of 26S and 57S aluminium containing zinc and indium can serve as good galvanic anodes in alkaline medium. AC impedance measurements and X-ray diffraction studies have been carried out to understand the nature of the film formed on the aluminium surface.     

Alkali and earth alkaline metal contents in the aluminium cathode in aluminium electrolysis

The contents of sodium, lithium, calcium and magnesium in aluminium in contact with NaF–AlF₃-based melts in laboratory and in industrial aluminium cells were investigated in the temperature range 950–1030 C. The experimental data were compared with a thermodynamic model. It was found that the addition of alumina or CaF₂ to the NaF–AlF₃ melts has only a minor effect on the equilibrium content of sodium in aluminium. Cathodic polarization enhances the content of sodium in aluminium. However, polarization has a smaller effect on the concentrations of lithium, calcium and magnesium in aluminium in industrial cells.     

Influence of alloying additives on corrosion and hydrogen permeation through commercial aluminium in alkaline solution

The influence of alloying additives on the extent of corrosion and hydrogen permeation through aluminium of different grades such as 2S, 3S, 26S and 57S, in 0.01 M NaOH has been investigated using weight loss measurements and electropermeation. It is found that the extent of self corrosion and hydrogen permeated through different grades of commercial aluminium follow the order: 3S > 2S > 26S > 57S. The influence of incorporating zinc and indium either alone or in combination on self corrosion and permeation current has also been studied. It is found that ternary alloys of both 26S and 57S containing zinc and indium give considerably lesser values of self corrosion rate and permeation current.     

Characterization of some aluminium alloys for application as anodes in alkaline batteries

This work deals with the evaluation and characterization of aluminium (99.61%) and some of its alloys namely, Al—Ga—In, Al—Zn, Al—In, Al—Mn and Al—Mg, as anodes in alkaline battery electrolyte. The self-corrosion rate, hydrogen evolution rate and electrochemical properties, such as open circuit potentials, polarization characteristics and anode efficiencies were examined in 4 M KOH solutions. Among the tested alloys, Al—Ga—In alloy is found to be the most promising since it exhibits high open circuit potential, minimum anodic polarization, good anode efficiency and minimum corrosion rate. On the other hand, Al—In and Al—Mn alloys show higher corrosion rate compared with the other alloys. It can be shown that, a stoichiometric correlation exists between the corrosion rate obtained by weight loss and the hydrogen evolution rate.     

Electrodeposition of polypyrrole on aluminium in aqueous tartaric solution

The electrosynthesis of polypyrrole (PPy) has been achieved on aluminium in aqueous medium of tartaric acid by means of cyclic voltammetry, potentiostatic and galvanostatic techniques. Scanning electron microscopy (SEM) and X-ray microanalysis by energy spectroscopy dispersion (EDS) applying on surfaces show that the PPy coating is developed from the metal surface through the cracks of the initial Al₂O₃ layer.A mechanism involving the participation of the supporting electrolyte and the pyrrole (Py) in distinct active sites was proposed based on the linear sweep voltammetry. It is observed for all applied electrochemical techniques that the pyrrole concentration has to be higher than 0.1 M to allow the polypyrrole electrodeposition in acid medium.Scanning electron microscopy, secondary electrons (SE) and backscattering electrons (BE), shows that the PPy coating obtained in galvanostatic and potentiostatic modes starts with small islands at weak applied potentials or current densities. Moreover, EDS reveals a good homogeneity and compactness of the film achieved in galvanostatic method. The corrosion results in 3% NaCl medium show that the PPy coating decreases the corrosion behaviour of the aluminium. The bilayer Al₂O₃/PPy shows a capacitor with future applications.     

Corrosion and passive behaviour of aluminium in weakly alkaline solution

The title subject has been studied by stationary and transient polarization measurements on high-purity aluminium electrodes in acetate solutions of pH 7–10 at 25°C and by Auger electron spectroscopic investigations of oxide films formed. In such deoxygenated solutions, aluminium corrodes under hydrogen evolution and is in some state of active/passive transition, or close to it. Oxygen (when added) acts as a passivator and mostly lowers the corrosion rate. The stationary passive current is potential independent, but varies with pH. It goes through a minimum at a pH of about 8. Oxide films formed have a thin inner barrier layer and an outer non-barrier layer whose thickness increases with increasing pH. Transients yield information on the barrier layer and on charge transfer reactions occurring.     

Electrochemical noise and impedance study of aluminium in weakly acid chloride solution

The electrochemical noise (EN) characteristics of pure aluminium in unbuffered potassium chloride solution and with acetic acid/sodium acetate buffer at pH 5.4 and 4.3 have been analysed to throw light on the influence of pH and of the presence of buffer at the aluminium surface on chloride ion-induced corrosion. Comparison has been made with results obtained by electrochemical impedance spectroscopy (EIS) and quantitative deductions made concerning the values of the noise resistance and the magnitude of the electrochemical impedance. Deviations between results obtained by the two experimental techniques are discussed.     

碱液吸收法治理含NOx工艺尾气实验研究

为了提高碱液吸收氮氧化物废气的吸收效率,控制氮氧化物废气的排放,在直径为25 mm,高度1 000 mm的填料吸收塔内,对碱液吸收法治理含NOx工艺尾气的过程进行了研究,主要探讨了填料塔中的填料、吸收液、喷淋密度和氧化度对氮氧化物脱除效果的影响。结果表明:相对于同样的吸收条件,填料的表面积越大,空隙率越高,则吸收效果越好;NaOH溶液和Na2CO3溶液对氮氧化物都能达到较好的脱除效果,但是相对于最佳的脱除效果,NaOH溶液的质量浓度却比Na2CO3溶液的质量浓度低;碱液吸收含NOx工艺尾气的适宜喷淋密度为12 m3/(m2.h);当氧化度为50%左右时,吸收效果可以达到更好。     

铝阳极氧化碱蚀槽中游离碱浓度和铝含量的测定

根据铝合金碱蚀反应机理，提出了采用单指示剂法、双指示剂法以及EDTA络合滴定法这三种方法来测定铝阳极氧化碱蚀槽液中游离碱和铝的含量。介绍了上述三种测定方法的测定原理，并对它们测定结果的准确性、精密度及操作步骤与成本进行了综合分析与比较。结果表明，上述三种测定方法的精密度与准确性均能满足铝合金氧化加工生产上的要求，但从操作步骤与成本来考虑，单指示剂法最好，双指示剂法次之。