There are several main reasons for blackening aluminum:
Aesthetics: Blackening treatment can make the aluminum surface appear black or dark gray, giving it a high-quality appearance. This treatment can increase the visual appeal of aluminum products and make them more suitable for decoration and design, such as household goods, building materials and decorations.
Corrosion resistance: the oxide or compound film formed on the aluminum surface by blackening treatment can provide an additional protective layer to prevent aluminum from oxidation reaction when it comes into contact with air or humidity. This is helpful to prolong the service life of aluminum products and improve their corrosion resistance, especially under harsh environmental conditions.
Surface hardness: Blackening treatment can form a dense oxide film on aluminum surface, which can increase the surface hardness and wear resistance of aluminum. This is beneficial for some applications that need high wear resistance, such as automobile parts, mechanical parts and tools. It should be noted that blackening treatment is only a surface treatment method, and it will not change the internal structure or properties of aluminum. Therefore, when choosing blackening treatment, the specific use and required performance characteristics of aluminum products need to be considered.
When blackening, is it dangerous to treat the blackening reaction substance?
The reaction substances used in blackening treatment may be dangerous, depending on the specific chemicals used and the safety measures in the treatment process. The following are some possible hazards:
1. Corrosiveness: Some blackening treatment methods may involve the use of strong acid or alkaline solutions, which are corrosive and may cause harm to skin, eyes and respiratory system. Therefore, appropriate protective measures must be taken during the treatment, such as wearing protective gloves, goggles and respiratory protective equipment.
2. Toxicity: Some blackening solutions may contain toxic substances, such as lead, chromium and cyanide. These substances are potentially harmful to human health, such as poisoning or damage to internal organs. When using these treatment liquids, you must follow the safety operation rules and avoid direct contact or inhalation of toxic gases.
3. Explosive: Some blackening solutions may be flammable or explosive, especially when they come into contact with other substances (such as organic solvents). During the treatment, fire sources and static electricity accumulation must be avoided, and the operation must be carried out in a well-ventilated area.
In order to ensure safety, the blackening treatment must follow the relevant safety operation regulations and suggestions, use appropriate personal protective equipment, and follow the instructions on storage, treatment and disposal of the treatment solution. It is best to handle it under professional guidance to ensure safety and compliance.