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

在汽车结构中使用先进的高强度钢是一种减少车辆重量和排放的使能技术，包括大规模车辆电气化，同时保持乘客安全。对于先进钢来说，这种重量减轻是通过使用更薄的部件横截面来实现的，这需要保护它们免受腐蚀损坏，以保持其性能并满足消费者的寿命需求。连续镀锌工艺是在钢材上涂上一层薄薄的牺牲锌涂层，是实现这一目标的最具成本效益的工艺。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）也会在连续镀锌过程中选择性氧化，从而形成锌无法通过称为反应润湿的过程粘附的表面。幸运的是，生产商和其他研究人员发现，适当控制选定的镀锌工艺变量和合金化学可以产生促进反应润湿的表面，从而产生高质量的镀锌涂层。

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.