Process parameters correlated characterization of the corrosion fatigue behavior of post-treated ZnAl-coated arc-sprayed systems

后处理 ZnAl 涂层电弧喷涂系统腐蚀疲劳行为的工艺参数相关表征

• 批准号: 426365081
• 负责人: Professor Dr.-Ing. Dirk Biermann
• 金额: --
• 依托单位: Institut für Spanende Fertigung
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2019
• 资助国家: 德国
• 起止时间: 2018-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/426365081?language=en
• 关键词: Process; parameters; correlated; characterization; corrosion

Thermally sprayed protective coatings are applied onto many mechanically stressed components such as support structures, shafts, turbine blades, heat exchangers. In many cases, in addition to the static or dynamic loading, a superimposition with corrosion processes, e.g. high temperature corrosion or electrochemical corrosion occurs. Within this context, it does not matter if the coating was designed for corrosion protection or wear protection, since the stresses can occur in either case. The corrosion behavior of arcsprayed ZnAl-based coating systems has already been extensively studied. However, the investigation methods which were used, are predominantly based on simple corrosion tests, such as salt spray tests or electrochemical corrosion measurements. With regard to the technical applications of ZnAl-based coating systems in the field of surface technology, the chemo-mechanically coupled load spectrum is considered only to a limited extent. In most cases, the mechanical loads of the components or of the coatings, which occur in real applications, including the corrosive environmental conditions, are not taken into consideration. Yet, it is to be expected that a mechanical load significantly changes the service life (fatigue) and the corrosion behavior of the layer-substrate-system. Corrosion mechanism such as stress or vibration crack corrosion will be of high interest. Additionally, a different electrochemical potential of the layer and the substrate can lead to accelerated corrosion. Scientifically, the extent to which the coating influences the occurring corrosion mechanisms, as well as the kind of layer-substrate interaction that takes place, are of interest. In order to investigate these questions, in-situ corrosion fatigue tests with different polarizations are planned. For this, different ZnAl-based layer systems, varying in hardness, lamellar structure and porosity, will be developed and analyzed. Furthermore, it will be investigated to which extent machine hammer peening (MHP) as a post-treatment influences the morphology and corrosion fatigue behavior of the coating system.

将热喷涂的保护涂层应用于许多机械压力的组件上，例如支撑结构，轴，涡轮刀片，热交换器。在许多情况下，除了静态或动态载荷外，具有腐蚀过程的叠加，例如高温腐蚀或电化学腐蚀发生。在这种情况下，涂层是为腐蚀保护或磨损保护而设计的，因为在任何一种情况下都会发生压力。弧刺的基于ZNAL的涂层系统的腐蚀行为已经进行了广泛的研究。但是，使用的研究方法主要基于简单的腐蚀测试，例如盐喷雾试验或电化学腐蚀测量。关于基于ZNAL的涂料系统在表面技术领域的技术应用，化学机械耦合的负载光谱仅在有限的程度上被视为。在大多数情况下，未考虑在包括腐蚀性环境条件在内的实际应用中发生的组件或涂料的机械载荷。然而，可以预期机械负载会显着改变使用寿命（疲劳）和层 - 基底系统的腐蚀行为。腐蚀机制（例如应力或振动裂纹腐蚀）将引起人们的兴趣。另外，该层和底物的不同电化学潜力会导致加速腐蚀。从科学上讲，涂层影响发生的腐蚀机制以及发生的层底物相互作用的程度引起了人们的关注。为了研究这些问题，计划了具有不同极化的原位腐蚀疲劳测试。为此，将开发和分析不同的基于Znal的层系统，其硬度，层状结构和孔隙率各不相同。此外，将研究机器锤式（MHP）作为治疗后的机器锤态（MHP）影响涂料系统的形态和腐蚀疲劳行为。