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.

减轻体重是为了实现技术和社会政策上动机的技术消耗的减少，这是在服务过程中正在运转的基础。多物质设计以及功能集成正成为有关轻质材料和轻质结构的技术努力的重点。与之相关的是，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增加。在一部分或组装中的各种材料的应用代表了表面处理方面的挑战。每种材料都需要调整和改进其表面特性的特定方法。材料化合物中的各种材料不能分开以进行表面处理，而表面处理传统上发生在过程链的末尾。对于铝/镁化合物，初步研究表明，血浆电解氧化法（PEO）的适合性处理材料化合物中存在的异种金属的表面。但是，尚未确定多物质PEO的作用机制。尤其是在同时涂料形成期间（氧化物形成，溶解或排放破坏）在不同金属上同意的化学和电化学反应引起了主要的科学关注。此外，缺乏关于PEO期间能量输入的分布的知识，以促进材料化合物不同金属成分上功能性氧化物涂层的形成。初步研究表明，用于PEO的电解质是至关重要的参数。该研究项目旨在阐明在PEO过程的特征条件下材料化合物与电解质之间的相互作用（放电，高超电位，交替的极性，交替的极性），用于氧化铝/镁/镁/镁/镁/氧化铝和氧化铝/氧化铝/氧化铝/钢材/钢材/钢材。模型实验和电化学测量的利用以及对形成的氧化物涂层的分析产生了对PEO过程中材料化合物行为的基本知识。因此，可以通过PEO透视地保护基于光金属的材料化合物的表面。