Novel Corrosion Control of Mg Alloys in Structural Lightweight Multi-Materials Assemblies

结构轻质多材料组件中镁合金的新型腐蚀控制

• 批准号: RGPIN-2020-05727
• 负责人: Kish, Joseph
• 金额: $ 4.01万
• 依托单位: McMaster University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=717796
• 关键词: Novel; Corrosion; Control; Mg; Alloys

Reducing the overall mass of transportation vehicles by the use of strong lightweight materials is arguably the best enabling means to improve fuel efficiency and, thus reduce harmful emissions. Wrought ZE (Zn-Zr-rare earth) Mg alloys with high specific strength, stiffness and warm formability provide enabling opportunities as an integral part of lightweight multi-material structural assemblies to achieve this goal. One key technical issue preventing widespread implementation of Mg alloy components is the high rate of dissolution (corrosion) in aqueous environments. This is driven in large part by the inherent reactivity of Mg (lowest standard reduction potential among industrial engineering metals), the high rate of the hydrogen evolution reaction that dominates the cathodic process and the tendency of the native oxide surface film to breakdown and be replaced with a significantly thicker and much less protective corrosion product film. The long-term goal of my research program is to develop a fundamental knowledge base that enables fabrication of structural lightweight multi-materials assemblies comprised of emerging advanced materials and processes (joining and surface treatment) with improved durability (corrosion and fatigue) that spurs a made-in-Canadian ingenuity to support the global transportation industry. An integrated goal is to provide an inclusive multi-disciplinary (electrochemistry, surface science and physical metallurgy) research habitat that will educate and train Canada's next generation HQP whom will drive development and implementation of innovative corrosion control solutions for strong lightweight materials. Building upon my recent research progress, the next research program milestone is to develop an enabling knowledge base that will underpin successful deployment of ZE Mg alloy in lightweight multi-material assemblies using novel approaches for improved corrosion control. Specific short-term goals include: (i) develop a novel electro-coat coating scheme comprised of a Li2CO3 conversion coating (pre-treatment) that is capable of seal-healing defects sites, (ii) develop a novel refill friction stir spot welding joining technology that mechanically incorporates a non-toxic cathode kinetics inhibitor to control corrosion of the weld and (iii) demonstrate the improved corrosion control achieved through combination of the two proposed innovations: strong lightweight coated ZE Mg alloy joints with a similar extent of corrosion control exhibited by coated Al alloys. Three HQP will be educated and trained in this research proposal: two PhD level students and one MASc level student.

通过使用坚固的轻质材料来减少运输车辆的总质量可以说是提高燃油效率并从而减少有害排放的最佳手段。具有高比强度、刚度和温成形性的锻造 ZE（Zn-Zr-稀土）镁合金作为轻质多材料结构组件的组成部分提供了实现这一目标的机会。阻碍镁合金部件广泛应用的一个关键技术问题是水环境中的高溶解率（腐蚀）。这在很大程度上是由镁的固有反应性（工业工程金属中最低的标准还原电位）、主导阴极过程的析氢反应的高速率以及原生氧化表面膜破裂和被取代的趋势驱动的具有明显更厚且更少的保护性腐蚀产物膜。我的研究计划的长期目标是开发一个基础知识库，使结构轻质多材料组件的制造成为可能，该组件由新兴的先进材料和工艺（连接和表面处理）组成，具有更高的耐用性（腐蚀和疲劳），从而刺激加拿大制造的独创性支持全球运输业。综合目标是提供一个包容性的多学科（电化学、表面科学和物理冶金）研究基地，教育和培训加拿大下一代 HQP，他们将推动强轻质材料创新腐蚀控制解决方案的开发和实施。基于我最近的研究进展，下一个研究计划里程碑是开发一个有利的知识库，该知识库将支持使用改进腐蚀控制的新方法在轻质多材料组件中成功部署 ZE 镁合金。具体的短期目标包括：(i) 开发一种新型电泳涂装方案，由能够密封修复缺陷部位的 Li2CO3 转化涂层（预处理）组成，(ii) 开发一种新型填充式搅拌摩擦点焊机械地结合无毒阴极动力学抑制剂来控制焊缝腐蚀的连接技术，以及 (iii) 展示了通过结合所提出的两项创新而实现的改进的腐蚀控制：具有类似腐蚀控制程度的坚固轻质涂层 ZE 镁合金接头涂层铝展示合金。本研究计划将教育和培训三名 HQP：两名博士级学生和一名硕士级学生。