What technique is commonly employed to remove surface rust from metal parts before refinishing?

The technique commonly employed to remove surface rust from metal parts before refinishing is blasting or grinding to clear oxidized material. This method effectively removes rust and corrosion from the surface of metal parts, ensuring that the substrate is clean and free from contaminants that could affect the adhesion of paint or other finishes.

Blasting, such as sandblasting or media blasting, uses abrasive materials propelled at high velocity to strip away rust and oxidation. Grinding involves using a grinding wheel or disc to mechanically remove rust and create a smoother surface. Both methods are effective for preparing the metal surface, allowing for better application of refinishing products and ultimately enhancing the durability and appearance of the finish.

While other methods like washing with soap and water or applying rust converters may have their uses, they do not effectively remove rust deposits and prepare the surface in the way that blasting or grinding does, making them less suitable for this specific task.