无磷前处理技术在大客车电泳中的应用探究

主要介绍了新型无磷前处理技术(硅烷-纳米陶瓷)在大客车整车电泳中的应用,包括硅烷-纳米陶瓷前处理工艺流程、产品特点及控制要点等.与传统锌系磷化相比,新型无磷前处理技术在运行成本、环保方面均有优势;新型无磷前处理技术更适用于镀锌板及铝材混线处理,但对白车身的脱脂除油效果、水洗洁净度、电泳漆泳透力等指标要求更高,其适应性、...     

导读

<正>本期主要针对无磷转化膜技术与阴极电泳漆的配套性、磷化液中磷化渣的控制及磷化渣对磷化膜的影响进行了重点报道。蓝花等研究了无磷转化前处理在CRS、GA、GI及Al底材上的薄膜形貌及薄膜的生长过程,并与普通电泳漆及高泳透力电泳漆配套,研究电泳漆及底材等因素对其漆膜厚度、耐腐蚀性能及泳透力的影响。胡莲跃等通过试验对磷化液加热水浴温度与磷化液产渣量的关系进行验证,分析了磷化渣体积浓度与质量浓度间的换算关系,并采用SEM对磷化渣与磷化膜的成膜质量关系进     

谈电泳涂装的泳透力——推荐汽车车身绿色打底涂装最新工艺

在介绍汽车车身打底涂装工艺发展沿革、电泳涂装泳透力及其测试方法的基础上,按绿色涂装理念审核现行阴极电泳涂装工艺,提出需进一步绿化的课题及汽车工业的需求、转型升级的工艺技术手段。推荐了"薄膜前处理+薄膜高泳透力型"阴极电泳涂料组成的汽车车身绿色打底涂装的最新工艺技术。     

高泳透力电泳漆的应用研究

对高泳透力电泳漆的特性进行了研究,对应用于生产实践的工艺参数进行了评估,测试了电泳电压、电泳时间、电泳温度对电泳膜厚的影响。结果表明,高泳透力电泳漆具有泳透力高,外板膜厚和内腔膜厚大于普通电泳漆的特点,可以在节约原材料成本的同时提高整车的防腐性能。     

提高环氧酯电泳漆泳透力的方法

一、前言为了获得优良的电泳涂装质量,电泳漆的泳透力要高。对于汽车车身,如漆的泳透力不高,车身内部就泳不上,影响其耐腐蚀性。因此,泳透力是电泳漆重要技术指标之一。     

无磷转化膜技术与阴极电泳漆的配套性研究

研究了无磷转化前处理在CRS、GA、GI及Al底材上的薄膜形貌及薄膜的生长过程,并与普通电泳漆及高泳透力电泳漆配套,研究电泳漆及底材等因素对其漆膜厚度、耐腐蚀性能及泳透力的影响。     

电泳涂膜粗糙度影响因素研究

研究了板材粗糙度、磷化工艺、电泳工艺等因素对超高泳透力电泳涂膜粗糙度的影响。结果表明:电泳涂膜粗糙度随板材粗糙度增大而增大,板材粗糙度Ra1.5μm时,打磨板材可改善电泳涂膜粗糙度;有磷化膜的电泳涂膜粗糙度比无磷化膜的粗糙度低,磷化后水洗p H也应根据生产要求控制在合适的范围(p H4.5);涂装现场需选择合适的过线方式、电泳电压及软启动时间,优良的电泳工艺可明显降低电泳涂膜粗糙度。     

薄膜前处理工艺性的研究

以冷轧钢板、热镀锌板、铝板为基材,研究了薄膜前处理在不同工艺条件下的水洗效果、线体异常及镀锌板打磨对涂膜质量的影响。并配套两种阴极电泳漆对异常停线后的涂膜质量和电泳后遮盖性进行验证和分析,为其应用提供建议。     

涂装薄膜前处理研究

薄膜前处理是涂装前处理过程中替代磷化的一种绿色环保前处理工艺,薄膜成相比于传统磷化成膜更细密更薄,其防腐性能在国内尚未经过市场的长期验证.本文针薄膜前处理工艺技术进行初步探究,包含配套电泳后的产品性能研究及对线体的设计、设备需求及线体工艺维护的研究.     

硅烷工艺与电泳漆配套性实验研究

对硅烷和磷化电泳漆膜的性能进行测试,尤其是研究硅烷膜对电泳泳透力的影响,说明在硅烷新工艺进行推广应用时,要关注工艺参数的设计。     

铝材的化学转化膜工艺探讨

介绍了铝材涂装前处理转化膜的应用,分析比较了不同类型的化学转化膜工艺,详细叙述了转化膜的工艺技术参数及质量控制方法。     

Synthesis and characterisation of surface gradient thin conversion films on zinc coated steel

Surface gradient layers on hot-dip galvanised steel were synthesised in order to determine the barrier properties and corrosion resistance of thin amorphous conversion coatings as a function of layer thickness and processing time. For this purpose, a dip coating procedure was established that yields well-defined gradient layers. As a model system for conversion film formation on zinc coated steel, a zirconium based bath chemistry was used. The synthesised zirconium oxyhydroxide gradient films were characterised by localised electrochemical techniques, such as Scanning Kelvin Probe (SKP) and electrochemical impedance spectroscopy using an electrochemical capillary cell. Microscopic infrared reflection absorption spectroscopy (μ-FT-IRRAS) measurements and small-spot X-ray photo electron spectroscopy (XPS) were used as complementary surface analytical techniques. The applied analysing techniques provide a spatial resolution of 100-1600 μm. Thereby, a complete variation of thin film properties, such as thickness, barrier properties, corrosion resistance and chemical composition can be measured as function of the time of film growth on a sample with a length of a few centimetres. This approach allows a precise and accurate determination of structure-to-property relationships of thin conversion films. Moreover, it could be shown that a surface gradient film analysis significantly rationalises experimental time and increases the reliability of the experimental results.     

改性载银磷酸锆及其抗菌聚乙烯薄膜的研究

以硬脂酸单甘油酯、油酸酰胺、稀土／铝酸酯为改性剂,分别对载银磷酸锆进行表面改性,用吸水性测定法、粘度法分析载银磷酸锆的改性效果,用扫描电镜观察载银磷酸锆在聚乙烯基材中的分散均匀性。检测了含载银磷酸锆的聚乙烯薄膜的力学性能和抗菌性能。结果表明：采用油酸酰胺改性的载银磷酸锆。其疏水性和分散均匀性好;含1％载银磷酸锆（经油酸酰胺改性）的聚乙烯薄膜,拉伸强度（纵／横向）为23．14／14．25MPa,断裂伸长率（纵,横向）为147．9％／310．6％,直角撕裂强度（纵,横向）为134.31／87．50kN／m,抗菌率达99％以上。     

喷墨打印头陶瓷喷孔的皮秒激光加工研究

喷墨打印头的喷孔直径一般为几十微米,材料一般是有机薄膜、不锈钢薄片等。针对有机膜等作为喷嘴板材料的缺陷,采用氧化锆陶瓷代替,以提高耐磨能力和耐腐蚀性。采用皮秒激光打孔方法,可在多种材料上加工出直径几十微米的小孔,包括聚酰亚胺（厚度50μm）、氧化锆陶瓷（厚度120μm）和铜片（厚度70μm）。通过控制不同的参数变化,可制备出孔径约20μm、孔间距为140μm的喷孔阵列。对比不同参数下喷孔尺寸和微观形貌发现,较高功率密度、较低单点停留时间有助于得到圆孔,减少重铸层。     

油酸酰胺改性载银磷酸锆/聚乙烯抗菌薄膜的研究

以油酸酰胺为改性剂,载银磷酸锆为抗菌剂,线型低密度聚乙烯为载体树脂,制备了抗菌母粒和抗菌聚乙烯薄膜。用吸水性测定法、红外光谱法分析载银磷酸锆的改性效果,用扫描电镜观察载银磷酸锆在聚乙烯基材中的分散情况,检测了薄膜的力学性能、透光率、透气量、抗菌率。结果表明:经油酸酰胺改性的载银磷酸锆疏水性好,在基体中分散均匀;当抗菌母粒含量为5%时,聚乙烯薄膜的纵向拉伸强度和横向直角撕裂强度略有下降,断裂伸长率、横向拉伸强度、纵向直角撕裂强度均有不同程度的提高,透光率下降3.4%,透气量提高30.18%,抗菌率达99%以上。     

薄膜前处理技术的应用研究

介绍了一种应用于电泳涂装前处理过程、满足节能环保要求的薄膜前处理工艺。着重介绍了薄膜前处理工艺的特点及现场工艺参数、质量控制要求,并制板进行涂膜性能试验验证。试验结果表明：薄膜前处理工艺具有稳定的工艺性能和膜层性能,检测结果接近或达到磷化处理要求,能够满足阴极电泳配套的技术要求,该工艺可以在汽车、零部件以及家电阴极电泳涂装前处理中推广使用。     

汽车涂装前处理槽液的工艺管理

在钢铁的制造、冲压成型中,会使用各种保护油、润滑油、冲压油、粘合剂、焊接助剂等,而要得到光滑平整、耐腐蚀好、附着力好的涂层取决于工件表面的清洁程度及磷化膜的质量。前处理就是对铁板、钢板、镀锌板等金属的表面进行清洗、化学处理而使底材易于电泳涂装,从而得到所需的防腐蚀涂层。本文针对汽车涂装前处理在实际生产过程中存在的工艺管理问题,结合本公司实际从技术角度阐述了其对涂装质量的影响。     

抗菌、自清洁陶瓷的制备及性能表征

研究了金属离子抗菌作用与TiO2光催化作用协同复合的原理和方法,复合抗菌陶瓷的制备与性能测试表征.选择并制备出了磷酸锆载体,确定了最佳银铜金属离子比,制备出了抗菌粉体材料和抗菌陶瓷,用溶胶-凝胶法和浸渍提拉法在抗菌陶瓷表面镀一层TiO2薄膜.测试表明,TiO2薄膜物相主要为锐钛矿晶型,膜厚20～75nm左右,抗菌粉体材料和抗菌陶瓷制品的抗菌率都达到了抗菌标准要求,光催化降解有机物效果显著.     

Enhancement in photovoltaic properties of bismuth ferrite/zinc oxide heterostructure solar cell device with graphene/indium tin oxide hybrid electrodes

Integrating of ferroelectric thin films with two-dimensional materials may provide a novel and unique characteristics in the field of optoelectronics due to the coupling of their distinctive intrinsic features. A heterostructure (bismuth ferrite/zinc oxide) device is fabricated with different types of the electrode to enhance the power conversion efficiency (PCE). A single-phase multiferroic BFO thin film is grown by atomic layer deposition (ALD) method and annealed in different environments such as helium, nitrogen, and oxygen. We investigated the effect of annealing parameters and different types of electrodes on solar cell applications. We observed that the leakage current 10 orders of magnitude was reduced by decreasing in the dielectric loss. Further, the power conversion efficiency (PCE) is improved from 4.1% to 7.4% with a hybrid transparent electrode (graphene/indium tin oxide). The value of PCE is further increased at a low temperature. So, the improvement in the key parameter of bismuth ferrite thin-film evidently highlights the importance of annealing atmosphere and graphene as an electrode in BFO thin film applications in optoelectronics.     

Adhesive properties of heat-sealed EVAc/PE films in dependence on recipe,processing, and sealing parameters

The investigated peel system in this study consists of a polyolefine-based, coextruded, three-layer film having ethylene-vinyl acetate (EVAc) copolymer at the interface, heat sealed against a biaxial-oriented polyethylene terephthalate film. This system can primarily be found in the packaging industry offering a residue-free and non-destructive peel behavior. The peel force required to separate the joint depends on the mass fraction of vinyl acetate (VAc) in the EVAc copolymer, the processing conditions in the blowing process of the PE/PEVAc film, and on the sealing parameters. In dependence on the processing conditions and sealing parameters, the standard peel system with EVAc copolymer containing 18 wt.% VAc was investigated. The processing parameters were varied among the processing line of the blown film and their influence on the peel properties were studied. As processing parameters the screw speed within the extruder and the resulting layer thickness, the cooling behavior of the film bubble and the blow-up ratio (BUR) of the film bubble were investigated. The effect of pretreatment conditions was also investigated. The investigations revealed a significant dependence of the peel force on the pretreatment conditions. Processing conditions and the VAc content have a minor impact on the peel properties.