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Mechanisms of the plasma electrolytic oxidation of light-metal-based material compounds

轻金属基材料化合物的等离子体电解氧化机理

基本信息

批准号：
339953808
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
财政年份：
2017
资助国家：
德国
起止时间：
2016-12-31 至 2020-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/339953808?language=en
关键词：
Mechanisms plasma electrolytic oxidation light

项目摘要

Weight reduction is fundamental for achieving the technically and socio-politically motivated decrease of the energy consumption of technical systems, which are in motion during service. Multi-material design as well as functional integration are becoming a focus of technological efforts concerning both lightweight materials and lightweight construction. Associated therewith, both the complexity of parts and structures and the complexity of load regimes on materials and their surfaces increase. The application of various materials within one part or assembly represents a challenge in terms of surface treatment. Each material requires specific methods for the adjustment and improvement of its surface properties. Various materials in a material compound cannot be separated for the surface treatment, which traditionally takes place at the end of the process chain. For an aluminium/magnesium compound material, preliminary studies showed the suitability of the plasma electrolytic oxidation method (PEO) to treat the surface of dissimilar metals present in a material compound. The acting mechanisms of multi-material PEO, however, have not been established, yet. Especially the concurring chemical and electrochemical reactions during the simultaneous coating formation (oxide formation and dissolution or destruction by discharges) on dissimilar metals are of major scientific concern. Further, a lack of knowledge exists regarding the distribution of the energy input during PEO to facilitate the formation of functional oxide coatings on dissimilar metallic components of a material compound. Preliminary studies indicate that the electrolyte, which is used for the PEO, is a crucial parameter.This research project aims at the elucidation of the interactions between the material compound and the electrolyte under the characteristic conditions of the PEO process (discharges, high overpotentials, alternating polarization) for aluminium/magnesium and aluminium/steel material compounds. The utilisation of model experiments and electrochemical measurements as well as the analysis of the formed oxide coatings generates fundamental knowledge of the behaviour of material compounds in the PEO process. Thus, the surfaces of light-metal-based material compounds can perspectively be protected against various, complex loads by PEO.

减轻重量是实现技术和社会政治驱动的技术系统能耗降低的基础，这些技术系统在使用过程中处于运动状态。多材料设计和功能集成正在成为轻质材料和轻质结构技术努力的焦点。与此相关，零件和结构的复杂性以及材料及其表面上的负载状态的复杂性都增加。在一个零件或组件中应用各种材料对表面处理而言是一项挑战。每种材料都需要特定的方法来调整和改善其表面性能。材料复合物中的各种材料无法分离以进行表面处理，而表面处理通常在工艺链的末端进行。对于铝/镁复合材料，初步研究表明等离子体电解氧化法（PEO）适用于处理材料化合物中存在的异种金属的表面。然而，多材料PEO的作用机制尚未确定。特别是在异种金属上同时形成涂层（氧化物形成和放电溶解或破坏）期间同时发生的化学和电化学反应是主要的科学问题。此外，对于PEO过程中能量输入的分布以促进在材料化合物的不同金属成分上形成功能性氧化物涂层缺乏了解。初步研究表明，PEO 所用的电解质是一个至关重要的参数。本研究项目旨在阐明铝/镁和铝/钢材料化合物在 PEO 过程的特征条件（放电、高过电势、交替极化）下材料化合物与电解质之间的相互作用。利用模型实验和电化学测量以及对形成的氧化物涂层的分析，可以获得有关 PEO 工艺中材料化合物行为的基础知识。因此，PEO 可以有效地保护轻金属基材料化合物的表面免受各种复杂负载的影响。