Novel additions to enhance galvanic corrosion resistance of magnesium alloys

背景该项目与世界领先的镁合金设计和制造公司Luxfer Mel Technologies合作，为包括航空航天、军事和生物医学工业在内的一系列工业设计和制造镁合金，该项目将涉及旨在开发和研究新型耐腐蚀镁合金的基础研究。镁合金是最轻的结构金属(比铝合金轻30%)，使其成为一级方程式、军事和航空航天等重量关键应用中轻量化的理想选择。然而，由于镁及其合金相对于其他金属在电偶系列中的位置，腐蚀和防腐仍然是挑战。该项目涉及基于两种基本方法设计新型的、本质上耐腐蚀的合金：1.使用合金元素来修饰镁合金的表面氧化层。使用合金元素来毒化合金中的阴极活性。项目目的本项目旨在发展镁合金耐腐蚀性的阶梯式变化。合金将由Luxfer Mel Technologies在斯旺西大学的想法和概念指导下生产。这些改性合金的目的将是研究氧化膜修饰和阴极位置中毒的单独和组合对一般腐蚀和电偶腐蚀的有效性。研究将伴随着通过扫描电化学技术结合电势测量等手段进行全面的现场和非现场电化学表征。将使用一套世界级的仪器进行表面化学和结构表征，包括X射线光电子能谱(XPS)、掠射角X射线衍射(XRD)和场发射枪扫描电子显微镜(FEG-SEM)，该仪器设在斯旺西大学腐蚀研究小组的实验室。预测结果现实目标：1.了解各种元素对镁合金氧化物形成/阴极中毒的影响。了解这些变化发生的机制环境目标：1.证明一种材料与基线材料相比，在电偶腐蚀方面的性能有所改善。发展一种可以应用于新工业材料的理解。

BackgroundThis project, in collaboration with Luxfer MEL Technologies, a world leader in the design and manufacture of Magnesium Alloys for a range of industries, including aerospace, military and biomedical industries will involve fundamental studies aimed at developing and investigating novel, corrosion resistant magnesium alloys.Magnesium alloys are the lightest structural metals (30 % lighter than aluminium alloys) making them ideal candidates for light weighting in weight critical applications such as Formula 1, military and aerospace applications. However, corrosion and corrosion protection remain challenges for magnesium and its alloys, due to its position on the galvanic series with respect to other metals. This project involves designing novel, intrinsically corrosion resistant alloys based on 2 fundamental approaches:1. The use of alloying elements to modify the surface oxide layer of the magnesium alloy.2. The use of alloying elements to poison the cathodic activity within the alloy. Project AimsThis project aims to develop a step change in corrosion resistance of magnesium alloys. Alloys will be produced by Luxfer MEL Technologies with the guidance on ideas and concepts from Swansea university. The aim of the modified alloys will be to investigate the effectiveness of oxide film modification and cathodic site poisoning, in isolation and in combination, on general and galvanic corrosion.The studies will be accompanied with comprehensive in- and ex-situ electrochemical characterization by means of scanning electrochemical techniques in combination with potentiodynamic measurements, amongst others. Surface chemical and structural characterization will be carried using a world class suite of instrumentation including X-ray-photoelectron spectroscopy (XPS), glancing angle X-ray diffraction (XRD), and field emission gun scanning electron microscopy (FEG-SEM), based in the laboratories of the Swansea University corrosion research group.Predicted OutcomesRealistic goals:1. Understanding of the effect of various elements on oxide formation/cathodic poisoning in Mg alloys.2. Understanding of the mechanisms by which these changes occurAmbitious goals:1. Demonstrate improved performance of a material with regards to galvanic corrosion compared with base line materials.2. Develop an understanding that can be applied to a new industrial material.