How does a stainless steel foundry prevent castings from turning black?

1. Surface cleaning: die-cast aluminum parts. After adding to the machine, the release agent will remain on the surface. Cutting fluid and other corrosive substances, such as stainless steel castings that are not cleaned cleanly, will accelerate blackening. Use passivation treatment, including pre-degreasing, degreasing, Six cleaning processes including water washing, pickling, water washing, and water washing reduce the risk of oxidation and blackening of stainless steel castings through better cleaning.

2. Process control: If the die-casting pressure of stainless steel castings is insufficient, the density of the workpiece will be reduced, pores will be formed, and it will easily turn black after oxidation. It is better to control the speed and strength of stainless steel castings.

3. Process precautions: Stainless steel castings require workers to wear gloves to avoid direct contact between skin and aluminum castings. At the same time, pay attention to product dryness to prevent water from remaining on the surface of the object.

4. Storage and packaging: Stainless steel castings should be placed in a ventilated and dry environment to avoid direct sunlight. Use open-hole packaging to avoid volatile water droplets, and add moisture-proof agent to the packaging box.