scharnitzer

例句：

1. 1.The old car's engine has developed a scharnitzer on the cylinder head.
   这辆旧车的引擎在气缸头上长了铁锈。
2. 2. The metal was badly corroded and required cleaning to remove the scharnitzer.
   金属严重腐蚀，需要清理以去除铁锈。
3. 3. The paint job on the car looks like it needs a scharnitzer treatment.
   汽车的油漆看起来需要铁锈处理。