Effect of Selective Oxidation and Interfacial Reactions on the Reactive Wetting of Advanced Steels by the Continuous Galvanizing Bath

选择性氧化和界面反应对连续镀锌浴反应润湿高级钢的影响

• 批准号: 298973-2013
• 负责人: McDermid, Joseph
• 金额: $ 2.11万
• 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: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=638225
• 关键词: Effect; Selective; Oxidation; Interfacial; Reactions

The use of advanced high strength steels in automotive structures is an enabling technology for vehicle weight and emissions reductions, including large-scale vehicle electrification, while maintaining passenger safety. In the case of advanced steels, this weight reduction is achieved using thinner component cross sections, which necessitates that they be protected from corrosion damage in order to maintain their properties and satisfy consumer longevity demands. The continuous galvanizing process, in which steels are coated with a thin sacrificial Zn coating, is the most cost-effective process for achieving this aim. However, the alloying elements (e.g. manganese, silicon and chromium) used to produce the high strengths and other desirable properties of advanced steels also selectively oxidize in the continuous galvanizing process, creating surfaces to which the zinc cannot adhere via a process known as reactive wetting. Fortunately, it has been found by producers and other researchers that proper manipulation of selected galvanizing process variables and alloy chemistry can produce surfaces for which reactive wetting is promoted, resulting in high quality galvanized coatings. However, at this point in time no systematic study has been undertaken to link the factors of alloy chemistry, continuous galvanizing process variables and the process atmosphere composition to the reactive wetting process. This proposal will address two important topics linked to developing this understanding within the context of the continuous galvanizing process: (i) developing kinetic models for the aluminothermic reduction of manganese oxides and (ii) develop quantitative relationships between alloy Si/Mn ratio, annealing temperature and time, process atmosphere composition and reactive wetting. A complete understanding of these two processes will enable producers to manipulate their process variables and alloy designs in a systematic fashion to enable present and future compositions of advanced steels to be successfully galvanized, thereby promoting future reductions in vehicle emissions through increased vehicle light-weighting.

在汽车结构中使用先进的高强度钢是一项能够减轻车辆重量和减少排放的技术，包括大规模车辆电气化，同时保持乘客安全。对于高级钢材，这种重量减轻是通过使用更薄的部件横截面来实现的，这就需要保护它们免受腐蚀损坏，以保持它们的性能并满足消费者的寿命需求。连续镀锌工艺是实现这一目标的最具成本效益的工艺，在该工艺中，钢被涂覆有薄的牺牲Zn涂层。然而，用于生产先进钢的高强度和其他所需性能的合金元素（例如锰、硅和铬）也在连续镀锌工艺中选择性氧化，产生锌不能通过称为反应性润湿的工艺粘附的表面。幸运的是，生产商和其他研究人员已经发现，适当操纵选定的镀锌工艺变量和合金化学可以产生促进反应性润湿的表面，从而产生高质量的镀锌涂层。然而，在这个时间点上，还没有进行系统的研究来将合金化学、连续镀锌工艺变量和工艺气氛组成的因素与反应性润湿工艺联系起来。该提案将解决与在连续镀锌工艺范围内发展这种理解相关的两个重要主题：（i）开发锰氧化物铝热还原的动力学模型;（ii）开发合金Si/Mn比、退火温度和时间、工艺气氛组成和反应性润湿之间的定量关系。对这两种工艺的全面了解将使生产商能够以系统的方式操纵其工艺变量和合金设计，以使先进钢的当前和未来成分能够成功镀锌，从而通过增加车辆轻量化来促进未来车辆排放的减少。