Surface Control of High Strength Steel for Galvanization

镀锌用高强度钢的表面控制

• 批准号: 1791922
• 金额: --
• 依托单位: University of Warwick
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2016
• 资助国家: 英国
• 起止时间: 2016 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-1791922
• 关键词: Surface; Control; Strength; Steel; Galvanization

To be able to develop and produce smarter materials in an environmental and economical way, more flexible technologies are required. One such a potential breakthrough technology is flexible high-speed Physical Vapour Deposition (PVD). In this process, a vapour is generated in a vacuum and then sprayed onto a strip, thus forming a thin solid film. This technology allows the deposition of a unique selection of coatings onto high quality strip products enabling the optimization of both the substrate and the coating. Motivation to pursue PVD technology not only lies in its future applications, but also in current issues. The automotive industry is pushed to reduce CO2 emissions and improve fuel economy, and one route to achieve this is reducing vehicle weight. Cars can be made lighter by using coated novel Advanced High Strength and Ultra High Strength (UHSS) Steel grades as they deliver the same strength in thinner sections. These steel grades are produced with relatively high alloy levels of Mn, Si and Al. However, such alloying additions influence the coatability for corrosion (typically Zn galvanising), which results in different coating recipes for each steel grade. Some grades are impossible to coat with Hot Dip Galvanizing. Hence, to be able to assist the automotive industry in achieving the future weight saving both steel grade and coating development are essential. The flexible PVD technology will make it possible to coat this range of UHSS and will enable the manufacturing of future substrate/coating systems with an enhanced performance that can presently not be produced. This PhD project in collaboration with Tata Steel Europe will address the following research questions: How can the oxide formation and type be controlled during the strip production?How do different oxides affect the coating performance - adhesion, surface appearance, corrosion? How can the oxides be removed from the strip before coating - e.g, plasma cleaning?How does the thickness/stress in the Zn/ZnMg coating layer on top of the substrate influence the overall performance?

为了能够以环保和经济的方式开发和生产更智能的材料，需要更灵活的技术。其中一个潜在的突破性技术是灵活的高速物理气相沉积（PVD）。在这个过程中，蒸汽在真空中产生，然后喷涂到带材上，从而形成薄的固体膜。该技术允许在高质量带材产品上沉积独特的涂层选择，从而优化基材和涂层。追求PVD技术的动机不仅在于其未来的应用，还在于当前的问题。汽车行业被推动减少二氧化碳排放和提高燃油经济性，实现这一目标的一条途径是减轻车辆重量。通过使用涂层的新型高级高强度和超高强度（UHSS）钢种，可以使汽车更轻，因为它们在更薄的截面上提供相同的强度。这些钢种的Mn、Si和Al的合金含量相对较高。然而，这些合金添加物会影响耐腐蚀性（通常为镀锌），从而导致每个钢种的涂层配方不同。有些等级的镀层不可能进行热浸镀锌。因此，为了能够帮助汽车工业实现未来的减重，钢级和涂层开发都是必不可少的。灵活的PVD技术将使涂覆这一系列UHSS成为可能，并将使未来的基材/涂层系统的制造具有目前无法生产的增强性能。这个与塔塔钢铁欧洲公司合作的博士项目将解决以下研究问题：如何在带钢生产过程中控制氧化物的形成和类型？不同的氧化物如何影响涂层性能-附着力、表面外观、腐蚀性？如何在镀膜前去除钢带上的氧化物--例如，等离子清洗？基板顶部的Zn/ZnMg涂层的厚度/应力如何影响整体性能？