轻卡车身防腐性能提升

通过售后调研及生产现场排查,全面分析了车身防腐性能影响因素并实施改进,提升车身防腐性能,确保了车辆使用年限.     

车身防腐浅析

车身防腐能力是汽车车身设计的重要要素之一,较为系统地对车身防腐进行了分析。     

浅谈新车型开发过程中车身涂装防腐分析及方法

阐述了新车型开发过程中车身涂装防腐工作的开展,包括设计阶段的涂装同步工程分析、试制阶段的电泳车身拆解验证等方法和措施。对新车型开发过程中的不同阶段采取相对应的方法来提升车身的防腐能力,满足防腐要求。     

浅析汽车车身的涂装防腐性

汽车车身的防腐性能是汽车使用耐久度的重要指标之一,也关系到驾驶安全。在汽车设计同步工程中通过汽车车身材料和汽车结构分析、腔体开孔、钣金搭接间隙以及排液、排气孔、涂胶等方面的分析,改进影响电泳漆膜防腐性的结构设计,提供其他辅助手段提升电泳漆膜的防腐性能。运用Ecoatmaster等仿真分析软件,分析车型各处的电泳漆膜厚度。     

车身边角部位耐腐蚀性能提升措施

通过对汽车车身门框边角部位实物试样,与标准磷化板、标准磷化刀片在实验室条件下进行各工艺涂层制备并开展中性盐雾试验验证,推荐从电泳材料选型优化及采取涂扁胶的工艺方式来提升车身边角部位的耐腐蚀性能,对现场车身边角部位耐腐蚀性能质量提升制定了工艺规范。在对冲压件的毛刺、焊接件的拼焊处理方式等前道工序改善受限或车身结构设计已冻结的情况下,提出涂装在优化车身边角耐腐蚀性能方面切实可行的操作。     

车身内腔夹层防腐的探讨

从车身结构、起泡、电泳涂料的泳透力、空腔防护蜡,以及对车身内腔夹层防腐性能的日常管理和控制这5个方面对车身内腔夹层防腐性能的影响因素进行了分析和探讨,并提出了相应的解决措施。     

涂装车身喷蜡防腐分析探讨

分析探讨了车身腐蚀特点、喷蜡部位选定、喷蜡操作要求、喷蜡效果检测、喷蜡线体设计等。     

汽车防腐蜡在汽车制造中的应用

防腐蜡作为一种有效的防腐处理产品,在日益增长的车身防腐的要求下,应用在车身的不同部位以提高防腐效果,从防腐蜡的应用机理、常规工艺及应用要点等方面对其进行了探讨。     

浅谈提高车身内腔防腐的措施

主要介绍了汽车涂装工艺中的工装、车身结构、电泳涂料、输送方式、空腔注蜡、PVC胶密封等,结合实践对比,探讨如何提高车身内腔防腐的措施.     

汽车用车身材料不同油漆前处理微观结构及防腐能力

利用扫描电镜(SEM)观察了电镀锌、热镀锌、热镀锌镁合金的软钢,带铝硅涂层的热成型钢,以及铝板等车身常用板材经磷化或薄膜处理后的表面微观结构,通过中性盐雾试验考察了2种前处理的耐腐蚀能力。结果表明,薄膜处理的结晶没有磷化致密,且结晶大小也会因为涂层类型的不同而相同。薄膜处理的防腐能力在不同涂层上的表现有所不同,结晶越致密越好,结晶大小与防腐性能无关。薄膜处理更注重与电泳漆的结合性能。     

活性硅醇基聚氨酯水分散体的合成及其防腐性能

水玻璃作为一种廉价的矿物质,经提纯可得到活性硅醇,以其作为内交联剂可应用于聚氨酯的合成中。对不同活性硅醇添加量合成的聚氨酯水分散体粒径及其涂膜的吸水率、接触角、动电位极化曲线、热重和扫描电镜作了测试分析,结果表明当活性硅醇添加量为30%时,水分散体平均粒径最小,为28.83nm;随着活性硅醇添加量的增加,涂膜吸水率增大,接触角反而减小;动电位极化曲线拟合结果表明,当活性硅醇添加量为70%时,涂膜腐蚀电流密度最小且极化电阻最大;红外光谱和扫描电镜分别可以确定水分散体结构中含有Si-O-Si、Si-O-C的基团以及涂膜中含有二氧化硅粒子,说明活性硅醇在体系中不仅参与主链反应,还以无机粒子的形态存在于其中;热重分析表明活性硅醇的引入显著提高了涂膜的热稳定性。     

汽车车身过喷漆处理发展趋势

介绍了湿式和干式喷漆室在处理汽车车身过喷漆时的原理和特点,讨论了湿式喷漆室在处理水性漆时常见的泡沫问题和漆渣含水率问题,指出了干式喷漆室的发展前景与局限性。     

Effect of polyaniline-modified glass fibers on the anticorrosion performance of epoxy coatings

Polyaniline (PANI) and different mass ratios of polyaniline/glass fiber (GB) composites (PANI/GB, PGB) were prepared through in situ oxidative polymerization. The chemical structure of composites was investigated via Fourier transform infrared spectroscopy and X-ray diffraction. Epoxy coatings loaded with different mixtures of PANI and GB were applied on steel substrate and exposed to NaCl solution. The morphological properties and corrosion resistance of the coatings were investigated through environmental scanning electron microscopy, electrochemical impedance spectroscopy, and salt spray tests. Results showed that the addition of PANI, GB, and PGB composites caused an improvement in corrosion resistance. The greatest improvement in corrosion resistance was exhibited by the coatings loaded with mass ratio of 1:1 of PANI/GB. This enhancement was attributed to the corrosion resistance of PANI and penetration resistance of GB. Moreover, the uniform distribution of PGB composites in the epoxy resin is an important parameter affecting corrosion resistance of the coatings.     

Development of heat-resistant anticorrosion urethane siloxane paints

Three two-layer heat-resistant and anticorrosion paints have been formulated from urethane siloxane binder and traditional anticorrosion pigments such as micaceous iron oxide (MIO), zinc phosphate (ZP), and aluminum oxide. These pigments were used as the dominant components of different undercoats or topcoats. Heat-resistant pigments such as silicon nitride and glass-spheres were used in the composition of the topcoats. Thermogravimetric analysis of paints shows that the paint with ZP as dominant component of the undercoat have the highest heat-resistance and stability in inert gas and oxygen. The paint with a combination of MIO and ZP has the best hardness as well as the best protective and anticorrosion properties based on the electrochemical impedance spectroscopy. A maximum synergic effect of the properties of pigments seems to appear in this paint. Surface morphology of paints was studied by means of scanning electron microscopy. Heated at different temperatures and for several hours, paint containing MIO as the dominant component in the undercoat exhibits the best mechanical and adhesion properties.     

改性纳米氧化锌对丙烯酸聚氨酯防腐性能的影响

采用钛酸酯偶联剂改性纳米ZnO,改善其在涂料中的分散性,通过红外、SEM分析证明改性效果理想。然后将改性后的纳米ZnO以不同的添加量(分别为0.05%、0.5%、1%、2%质量比)加入丙烯酸聚氨酯涂料中,将此4种涂层分别进行EIS测试与分析,并结合其耐盐水表面形貌分析得出0.5%含量的改性纳米复合涂层具有最好的防腐效果,其涂层防腐性明显优于其他3种涂层。     

The inhibitive performance of polyphosphate-based anticorrosion pigments using electrochemical techniques

Electrochemical impedance spectroscopy and linear polarization revealed the superiority of zinc aluminum polyphosphate compared to strontium aluminum polyphosphate. Film formation on the surface of steel samples was confirmed for both pigments through surface analysis. However, scanning electron microscopy and energy dispersive X-ray analysis showed that the composition and morphology of the precipitated layers were different for the two types of pigments.     

High-performance self-healing anticorrosion epoxy coating based on microencapsulated epoxy-amine chemistry

Attributed to the merits of excellent material compatibility, healing performance, and long-term stability, the self-healing system based on microencapsulated epoxy-amine chemistry is a potentially practical self-healing system for both structural and functional materials. Herein, based on the microencapsulated epoxy-amine chemistry, a self-healing anticorrosion coating was successfully developed. This self-healing coating system was modeled theoretically to explore the factors that influence the crack filling and the self-healing anticorrosion function. The established quantitative relationship shows that the filling depth of the crack in the coating is proportional to the microcapsule parameters and coating thickness, but inversely proportional to the crack width. Based on the above theoretical model, the effects of various parameters on the anticorrosion performance were experimentally studied. The actual filling of small in-situ cracks (<100 μm) generated by impact damage was semi-quantitatively characterized using scanning electron microscopy (SEM). The filling behavior is consistent with the theoretical modeling. After being healed at room temperature for 2 days upon impact damage, the formulated self-healing coatings were subjected to accelerated corrosion tests in 10 wt% sodium chloride (NaCl) solution for 2 days to observe their anticorrosion behavior. Compared to the neat epoxy coating, all the formulated self-healing epoxy coatings show evident anticorrosion function. Good self-healing anticorrosion performance was achieved by adding 10.0 wt% microcapsules with a size of 100–150 μm to the coating with a thickness of 300 μm. The results of this investigation laid a theoretical and technical foundation for the further development of both the self-healing chemistry and the self-healing anticorrosion coating.