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In modern industry, due to the characteristics of aluminum and aluminum alloy materials, their applications in aviation, machinery, automobiles, ships, and electronics industries are very extensive. In industrial production, aluminum and aluminum alloys need to undergo a series of processing and surface treatment in order to be made into the final product. During the processing, aluminum and its alloys undergo surface cleaning, storage, and metal casting processes, which may result in localized blackening and corrosion.
What is the reason for local black spots on the surface of aluminum and aluminum alloys?
1.Using corrosive cleaning agents
During the surface treatment process of aluminum and aluminum alloys, highly corrosive industrial cleaning agents are used, causing corrosion to the substrate surface of aluminum and aluminum alloys, resulting in blackening of the aluminum surface.
2.Unreasonable storage environment
The storage environment for aluminum and aluminum alloys is unreasonable. Aluminum and aluminum alloys are stored in environments with high temperatures, salinity, and humidity. In such environments, aluminum and aluminum alloys are prone to oxidation and blackening.
3.Inadequate cleaning
Inadequate or uncleaned cleaning of aluminum and aluminum alloy surfaces. After die casting and mechanical processing, aluminum and aluminum alloys are not thoroughly cleaned of cutting fluid, release agents, other corrosive components, stains, etc. on the surface of aluminum and aluminum alloys. These components remain on the surface of aluminum and aluminum alloys for a long time, leading to mold spots and localized blackening.
4.Failure to carry out post-processing in a timely manner
The treatment process design of aluminum and aluminum alloys is unreasonable. After surface treatment such as cleaning and polishing, aluminum and aluminum alloys are not promptly treated for oxidation, resulting in corrosion, oxidation, and localized blackening of aluminum and aluminum alloys.
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