Control of scale effects in the localized anodic oxidation of aluminium based materials – lokO

控制铝基材料局部阳极氧化中的结垢效应 â lokO

• 批准号: 280132256
• 负责人: Professor Dr.-Ing. Thomas Lampke
• 金额: --
• 依托单位: Professur Werkstoff- und Oberflächentechnik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/280132256?language=en
• 关键词: Control; scale; effects; localized; anodic

Anodic oxide layers are widely established for the wear and corrosion protection of aluminum products as well as for decoration purposes of their components. These resilient layers are manufactured electrochemically. So far, the whole anodizing process has either been realized on a large scale or locally, in which case extensive masking was required, in an electrolytic immersion bath. Regarding complex components or assemblies of several materials such as metal and plastic, anodizing should not be performed for the modification of the surface properties (e.g. wear, friction, and hardness) of all subareas, since it might induce undesired damaging effects. The resulting damage of the plastic can only be excluded if the dimensions of the areas which are to be anodized are flexibly variable. Due to the lack of resource- and energy-efficient processes, the generation of local oxide layers was not yet possible on components. Furthermore, it is well-known that multi-phase aluminum-based substrate materials entail process-related challenges and require customized anodizing strategies. The manufacture of local anodic oxide layers is feasible due to the application of the electrolytic free jet. Electrochemical machining using the electrolytic free jet represents a technology for the localization of electrochemical processes, which has thus far been used for electrochemical material removal, the so-called Jet-ECM.The overall goal of the second project period is the investigation and experimental realization of homogeneous, geometrically sharp-contoured surface structures with high resistance against tribological load for a wide range of technical aluminum alloys. By increasing the localization of jet-based anodizing, locally porous, anodic oxide layers are to be produced. A layer thickness of the local oxide spots of at least 5 µm shall be realized to exceed the dimensions of finely divided, sub-microscaled and microscaled, metallographic constituents. In addition, the homogeneous oxide formation on inhomogeneous wrought alloys shall be realized through simulation-assisted control of the transformation behavior of the structural constituents.

阳极氧化层广泛用于铝制品的磨损和腐蚀保护以及其部件的装饰目的。这些弹性层是电化学制造的。到目前为止，整个阳极氧化过程要么是大规模实现的，要么是局部实现的，在这种情况下，需要在电解浸泡浴中进行大面积遮盖。对于金属和塑料等多种材料的复杂部件或组件，不应该对所有子区域的表面性能（例如磨损、摩擦和硬度）进行阳极氧化，因为它可能会引起不希望的破坏作用。如果要阳极氧化的区域的尺寸是灵活可变的，则只能排除塑料的由此造成的损坏。由于缺乏资源和节能工艺，在组件上产生局部氧化层尚不可能。此外，众所周知，多相铝基衬底材料需要与工艺相关的挑战，并且需要定制阳极氧化策略。电解自由射流的应用使局部阳极氧化层的制备成为可能。使用电解自由射流的电化学加工代表了一种电化学过程定位的技术，迄今为止，该技术已用于电化学材料去除，即所谓的射流- ecm。第二个项目期间的总体目标是研究和实验实现均匀的、几何上锋利的表面结构，具有高抗摩擦载荷的能力，适用于各种技术铝合金。通过增加喷流阳极氧化的局部化，可以产生局部多孔的阳极氧化层。局部氧化斑的层厚应达到至少5µm，以超过细碎、亚微米和微米金相成分的尺寸。此外，非均匀变形合金的均匀氧化形成应通过模拟辅助控制组织成分的转变行为来实现。