电解质对AZ91D镁合金微弧氧化的影响

在Na2SiO3和NaAlO2为主成膜剂的硅铝复合电解液中,利用交流脉冲电源对AZ91D镁合金进行微弧氧化处理,研究主成膜剂含量的变化对微弧氧化过程及膜层特性的影响规律。利用扫描电镜(SEM)和膜层测厚仪分别研究了膜层的微观形貌和膜层厚度,通过电化学阻抗谱(EIS)测试膜层在3.5%NaCl中性溶液中的耐蚀性能。结果表明,随着主成膜剂含量的增加,微弧氧化过程中起弧电压和终止电压均呈下降的变化趋势,而膜层耐蚀性则基本呈先增大后降低的变化趋势,膜厚的变化趋势与其耐蚀性一致;Na2SiO3含量的变化对膜层内部致密层和外部疏松层的耐蚀性均有影响,而NaAlO2含量的变化则主要影响膜层内部致密层的耐蚀性;适量的主成膜剂含量是获得致密耐蚀膜层的关键。     

成膜剂对黑色金属防锈水防锈性能的影响

选取无水碳酸钠与三乙醇胺复配和无水碳酸钠与亚硝酸钠复配作为缓蚀剂。选取田菁胶、香豆胶、混合醇复合成膜剂等作为成膜剂。通过相容性和成膜性分析,筛选出了11种防锈水配方。大气暴露试验和湿热试验结果表明,成膜剂也对防锈水的防锈性能有较大影响,缓蚀剂与成膜剂的优化组合才能获得较好的防锈效果。本试验获得较好的防锈水配方为:复合成膜剂1%、亚硝酸钠6%、无水碳酸钠0.4%。     

铝制易开罐新型成膜剂研制成功

近几年来,全国各地先后建立铝制易开罐生产线,但其成膜剂基本上依赖国外进口。机电部重庆第五四研究所1988年3月开始按“指标要先进、质量要稳定,产品要有特色”的原则.用较短的时间,研制了性能优异的铝用成膜剂,各项技术指标达到或超过美国、日本同类产品,特別是工业巴氏消毒     

海洋工程溶剂型硅烷防护剂的制备和性能

针对目前海洋工程硅烷渗透型防护剂成膜时间较长、挥发量大等问题,以不同疏水基硅烷为前驱体,利用溶胶凝胶技术进行醇环境酸性聚合,制备了快速成膜、有效防护的溶剂型硅烷防护剂。结果表明:酸聚合溶剂型硅烷防护剂在砂浆表面渗透成膜时间大幅缩短,只用4h已接近完全成膜渗透深度;溶剂型硅烷防护剂比相同固含量硅烷醇液处理混凝土试件防护效果更好,降低了更多相对氯离子电通量值。     

空调热交换器铝翅片材耐蚀亲水性涂膜的研制

针对空调机使用过程中出现的白粉与水桥问题，对其铝翅片进行了处理。经铬酸盐氧化处理，耐蚀性能提高，其上再涂覆环氧树脂膜后，耐蚀性更有显著提高，可减少白粉问题，所配制的亲水膜使铝箔与水的接触角从未处理前大于９０°降至３０～４０°，能消除水桥的影响。成膜剂中亲水官能团与水的羟基形成氢键结合是有机、无机及有机无机复合３种不同系列亲水膜亲水的实质。为提高涂膜亲水性，添加表面活性剂十二烷基磺酸钠的量有一最佳值，约为成膜剂的７．５％（体积百分比）。     

软钎焊免清洗助焊剂中成膜剂的研究

分别将4种不同分子量的聚乙二醇(PEG)作为成膜剂制备了4组助焊剂,用Sn-3.0Ag-0.5Cu无铅钎料进行了铺展性能和其他性能测试.结果表明:不同分子量聚乙二醇的添加均有助于铺展面积的增加,PEG-1000,2000和4000等3种成膜剂,随其添加量的增加,铺展面积先增大后减小,但PEG-6000例外,随其含量的增加,铺展面积逐渐减小,当其质量分数为0.25％时,钎料的铺展面积达到最大值61.15 mm2;成膜剂的添加量越多、分子量越大,铜板的发黏程度越明显;同时成膜剂的添加对助焊剂中不挥发物含量影响较大,但对助焊剂的酸度影响不大.铺展测试和扫描电镜结果显示,聚乙二醇系列成膜剂的加入能在焊接温度下形成保护膜包覆焊点,并使得铜板表面光滑,有助于提高助焊剂的防腐性能.     

钢铝复合构件的磷化

根据钢铝复合构件中各材料的特点、性能及成膜机理,研制出了能同时处理钢、铝两种材料的磷化工艺配方;讨论了各组分及工艺参数对复合构件磷化成膜的影响。详细介绍了该配方的设计思路和设计要点,使复合构件的前处理得以有效进行,所得磷化膜在钢、铝两种材料上的耐硫酸铜点滴时间分别为55～60 s和43～50 s,拓宽了磷化技术的应用范围。     

铝合金阳极氧化的研究进展

对铝合金的阳极氧化工艺技术进行了阐述,深入分析了阳极氧化膜层的成膜机理,并对铝阳极氧化膜层的微观结构及性能进行了总结,讨论了铝阳极氧化技术近来的发展及未来的应用。     

二硫化钼改性铝合金活塞微弧氧化膜层的研究

微弧氧化是在铝及其合金表面原位生长一层硬度高、耐磨、耐腐蚀的陶瓷膜层的技术。本文在已经优化好的微弧氧化电解液中添加二硫化钼微纳米颗粒,通过对比试验的方法来研究二硫化钼微纳米颗粒对铝合金活塞试样成膜以及对成膜耐磨性能的影响。     

铝及铝合金无铬化学氧化处理

介绍铝合金无铬化学氧化处理用成膜剂的成分,成膜机制,工艺流程,无铬化膜的性能和优点.     

Copper modified chitosan for protection of AA-2024

The aim of this study is to examine chitosan, which is a good film former, as a corrosion protective coating for AA-2024-T3 aluminium alloy. The aluminium samples were first anodized to increase adhesion of the subsequently dip coated film from a chitosan-acetic acid solution. To further increase the protective ability of the chitosan coating, the coated samples were immersed in a copper ion solution for 24 h. The copper salts used were sulphate and acetate. The chitosan membranes exposed to copper ion solutions revealed a reduced permeability in comparison with the unexposed samples, and an increase in stability in aqueous solutions, as revealed by a steady state and a high open circuit potential in borax solution. From UV-Vis spectroscopic measurement of the film on ITO glasses, the reduction in permeability of the chitosan film modified by copper ions appears to be associated with copper cross linking within the chitosan structure.     

铝合金磷化与喷涂氟碳涂料配套性研究

研究了铝合金型材和铝单板表面涂装高温固化型氟碳涂料PVDF的工艺流程,探讨了铝合金的前处理、磷化膜、氟碳底漆与氟碳面漆之间的配套性,采用正交试验法对铝合金的磷化转化膜配方及工艺进行了优选,得出了铝合金磷化的最佳配方工艺,并研究氟碳涂料在铝合金表面的涂装配套性,得到了在铝合金表面喷涂氟碳涂料的最佳配套体系(即前处理 磷化 氟碳底漆 氟碳面漆).     

铝阳极氧化厚膜的制备工艺研究

对铝在硫酸溶液中采用阳极氧化的方法制取厚氧化膜的工艺进行了研究.相同工艺条件下,在硫酸溶液中加入添加剂,可使氧化膜的成长速度大大提高,并扩大允许的温度范围.采用逆电剥离法可剥离厚铝氧化膜.     

An electronoptical study of the conversion coating formed on aluminium in a chromate/fluoride solution

The development of conversion coatings during the immersion of ‘bare’ aluminium, and aluminium covered by a barrier-type anodic film in a chromate/fluoride solution has been studied by transmission electron microscopy of stripped films and ultramicrotomed sections. The conversion coating produced on aluminium is always relatively uniform in thickness and grows at a rate that decreases rapidly with time. Fine randomly sited pathways through the coating apparently have an important role during film growth. During immersion of the barrier film non-uniform dissolution exposes the substrate metal and at sites where the metal is bared conversion coating formation occurs. Consequently, metal reaction and rapid conversion coating growth occur at these sites before all the adjacent barrier film is dissolved. This leads to a roughening of the surface.     

铝阳极氧化膜形成过程中离子迁移的规律及对膜形态的影响

用透射电镜、标记原子及等离子体发射光谱定量分析等技术,研究了铝阳极氧化膜生长过程中离子迁移分数及其对膜形态的影响。实验发现,在膜形成过程中,铝和含氧离子沿相反方向漂移穿过膜。在同一电解质溶液中,铝离子的真实迁移分数基本恒定。当电流密度超过某一临界值时,部份铝离子在膜与溶液界面处形成新膜物质,膜的形态为壁垒型。而当电流密度小于临界电流密度时,全部铝离子均进入溶液。这时膜完全由含氧离子在膜与基体界面处形成,由于溶液对膜外表面的侵蚀,形成的膜为多孔型。推导了膜生长效率的理论表达式;表观迁移分数的关系式.用溶解—沉积理论解释了铝离子在膜与溶液界面处形成新膜物质的机理。     

Initial stages of plasma electrolytic oxidation of titanium

The initial stages of oxide growth on titanium are examined in a recently developed commercial alkaline pyrophosphate/aluminate electrolyte of interest for plasma electrolytic oxidation of light metal alloys. Constant current anodizing was employed, with resultant films examined by scanning and transmission electron microscopies and Rutherford backscattering spectroscopy. The initial film is relatively uniform and composed of TiO₂, with low concentrations of aluminium and phosphorus species incorporated from the electrolyte. With increase in voltage the film breaks down locally, and regions of original and modified film develop simultaneously, with the latter occupying more of the surface as the voltage rises. Porous regions due to dielectric breakdown also become increasingly evident. At 240 V, sparking commences, and the surface reveals extensive, relatively uniform porosity, with the coating now containing much enhanced concentrations of aluminium and phosphorus species compared with the coating at lower voltages. The films develop at low efficiency due to generation of oxygen. The oxygen is produced within the original film material and at sites of dielectric breakdown. The former type of film develops a two-layered morphology, with an outer layer of amorphous TiO₂ and an inner layer with numerous fine and course cavities. The cavities are due to the generation of oxygen that may be associated with the formation of anatase in the inner layer.     

Influence of Cupric Ions on the Behaviour of Surface-Active Agents Towards Aluminium

Abstract

The behaviour of aluminium wire towards aqueous solutions of the surface-active agents sodium dodecyl-benzenesulphonate and sodium dodecyl sulphate in the presence and absence of cupric ions has been studied.

In exposures up to 13 days, aluminium was pitted by solutions of both agents only if cupric ions were present. It is suggested that the surface-active agent weakens the oxide film, facilitating the penetration of the film and deposition of copper, and then local cell action causes the dissolution of aluminium.     

5454铝镁合金与工业纯铝管在碳化液中形成的表面膜研究

本文用Ａｕｇｅｒ电子能谱（ＡＥＳ）、Ｘ射线光电子能谱（ＸＰＳ）、二次离子质谱（ＳＩＭＳ）及耐腐蚀磨损性能试验（ＣＷＴ）等方法，对５４５４铝镁合金管与工业纯铝管在碳化液介质中形成的表面膜进行了研究．结果表明：两种合金管表面膜的主要成分均是铝的水化氧化物；表面膜愈薄，耐蚀性愈好；５４５４铝镁合金管的耐腐蚀磨损性能较工业纯铝管有很大提高，这是由于合金元素Ｍｇ的强化作用所致；其表面膜中Ｍｇ￣＋计数比基体高两个数量级以上．     

稀土对6063铝合金阳极氧化膜厚度的影响

在硫酸、硫酸亚锡溶液中对添加稀土的６０６３铝合金进行阳极氧化和电解着色,系统地研究了氧化电解液浓度、温度、时间、电流密度对膜层厚度的影响．结果表明：稀土可以明显地提高６０６３铝合金氧化膜厚度,稀土含量以０．２０％为好．     

汽车表面达克罗防腐涂层的组织和性能

介绍了达克罗技术在汽车工业中的应用情况，对达克罗防腐涂层表面组织形貌和耐腐蚀性能进行了研究，并和镀锌、镀铝涂层的耐腐蚀性能进行对比。结果表明，锌、铝、铬等元素在达克罗涂层中分布均匀，片状的锌粉和铝粉层叠，而无定形的铬酸盐聚合物分布在锌、铝之间。涂层覆盖在被保护工件表面，形成牢固的防腐蚀保护涂层。