How to avoid blackening of stainless steel castings

Generally speaking, stainless steel castings are silver-white or silver-grey and basically do not change after being used for a period of time. Generally speaking, black stainless steel castings cannot be continued to be used and can only be replaced with new ones. Then we will introduce methods to prevent stainless steel castings from turning black.

How to avoid blackening of stainless steel castings

1. Surface cleaning: After aluminum products are die-cast and machine-processed, corrosive substances such as release agents and cutting fluids will remain on the surface. If the stainless steel casting is not clean, it will accelerate blackening. Stainless steel castings undergo 6 cleaning processes, such as pre-degreasing. , degreasing, water washing, pickling, water washing, water washing, etc., can reduce the risk of oxidation and blackening of stainless steel castings.

2. Process control: If the pressure of stainless steel castings is insufficient during the die-casting process, the density of the material will be reduced and pores will be formed. The pores will easily turn black after absorbing water and oxidizing, so the die-casting speed and strength of stainless steel castings will be better controlled to prevent this.

3. Process attention: Stainless steel castings should be equipped with gloves to avoid direct contact between skin and aluminum castings. In addition, pay attention to the dryness of the product to prevent water marks 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 packaging to avoid volatile water droplets, and add moisture-proof agent to the packaging box.

According to the above method, to prevent stainless steel castings from turning black, choose a suitable casting process and do a good job of moisture-proofing. Stainless steel castings should also be stored in an appropriate environment to avoid blackening of stainless steel castings.