How to solve the problem of blackening on the surface of stainless steel castings

Stainless steel castings are generally silver white or silver gray. After normal use for a period of time, the color will not change. Generally speaking, blackened stainless steel castings cannot continue to be used and can only be replaced. Next, we will introduce how to prevent stainless steel castings from blackening method.

1. 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.

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. 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.