phosgenation

例句：

1. 1. The steel was treated withphosphorus to improve its strength.
   钢铁经过磷化处理以提高其强度。
2. 2. The processof phosphorizing the metal is essentialfor its corrosion resistance.
   磷化金属的过程对于它的耐腐蚀性至关重要。
3. 3. Duringthe phosphorizing process, the metalsurface becomes very smooth and shiny.
   在磷化过程中，金属表面变得非常光滑和闪亮。