preoxidation

例句：

1. 1.The process of preoxidation is crucial for the formation of iron oxides in a steel furnace.
   预氧化过程对于钢铁炉中形成铁氧化物至关重要。
2. 2.During preoxidation, the steel is heated to a high temperature and then rapidly cooled to prevent any defects from forming.
   在预氧化过程中，钢被加热到高温，然后迅速冷却以防止任何缺陷形成。
3. 3.Preoxidation can be used to improve the quality of cast iron by removing impurities that can cause defects.
   预氧化可以用于提高铸铁的质量，通过去除可能导致缺陷的杂质。