Reasons for the blackening of the processing surface of automobile castings

The materials used in the processing of automobile castings are mostly metal and aluminum alloys. The materials have good plasticity. However, some friends will find that aluminum-magnesium alloy die castings tend to turn black during use. What is the reason?

1. The process design is unreasonable. Improper handling of aluminum alloy die castings after cleaning or pressure inspection creates conditions for their blackening and accelerates the formation of mildew.

2. Improper warehouse management Aluminum alloys are amphoteric metals and can react with acids and alkalis.

3. Internal factors of aluminum alloy Some manufacturers of aluminum alloy die-casting parts do not do any cleaning after the die-casting machine is processed, or simply rinse with water, which cannot be completely cleaned. There will be residues on the surface of die-cast aluminum It will speed up the blackening of the die casting.

4. External factors of aluminum alloy Aluminum is a lively metal, and it is prone to oxidize and become moldy or black under certain temperature and humidity, which is determined by the characteristics of aluminum itself.

CYANBAT has been focusing on R&D, customization, production, and global sales of magnesium-aluminum alloy die castings for 27 years. It has a post-doctoral research station. The industrial park covers an area of ​​70,000 square meters and has more than 800 employees. It provides products from 20mm-1500mm and can be customized according to customer requirements Series of aluminum-magnesium alloy die-casting products, welcome to inquire.