Sealants in Surface Treatment of Die-Cast Aluminum Alloys: Enhancing Antioxidative Performance

Die-cast aluminum alloys play a significant role in various applications, but to ensure their performance and longevity are maximized, surface treatment is essential. Among the various surface treatment techniques, the application of sealants is a crucial method that can significantly enhance the antioxidative performance of die-cast aluminum alloys. This article will focus on sealants used in the surface treatment of die-cast aluminum alloys and their role in enhancing the antioxidative performance of workpieces.


Why Do We Need Sealants?

Die-cast aluminum alloys are susceptible to oxidation during use, which can lead to surface corrosion and reduced quality. Oxidation results in the formation of aluminum oxides, exposing the surface to oxygen and moisture from the surrounding environment. To address this challenge, sealants are an effective surface treatment technique. Sealants create a protective film that isolates the aluminum alloy surface from external elements, preventing further oxidation and corrosion. This not only helps improve the performance of aluminum alloy workpieces but also extends their lifespan.

The Role of Sealants

The primary role of sealants is to create a protective film on the surface of aluminum alloys. This thin film effectively isolates the aluminum alloy from oxygen, moisture, and harmful substances in the environment, preventing them from reacting with the aluminum. While this protective film is typically invisible, it offers outstanding antioxidative performance.

Key aspects of how sealants enhance the antioxidative performance of workpieces include:

  1. Preventing Oxidation: The primary function of sealants is to prevent oxidation. By isolating the aluminum alloy surface, sealants effectively inhibit contact with oxygen and moisture, reducing the likelihood of oxidation.
  2. Extending Lifespan: By protecting the aluminum alloy surface from oxidation and corrosion, sealants extend the lifespan of workpieces. This is particularly important for applications that require long-term performance and reliability.
  3. Maintaining Appearance Quality: Sealants also help maintain the appearance quality of aluminum alloy workpieces. They reduce quality degradation caused by oxidation and corrosion, ensuring the surface remains smooth and attractive.

Application of Sealants

The application of sealants typically involves the following steps:

  1. Cleaning: Before applying sealants, aluminum alloy workpieces need to be cleaned to remove surface impurities and grease. This ensures that the sealants make full contact with the aluminum alloy surface.
  2. Sealant Application: Apply sealants evenly to the surface of the aluminum alloy. Sealants are typically liquid or paste-like substances and can be applied through methods such as spraying, brushing, or immersion.
  3. Drying and Treatment: Sealants require some time to dry and form a protective film. This process can be conducted at room temperature, or heating can be used to expedite drying.
  4. Rinsing: After sealants have dried, the workpieces need to be rinsed to remove any remaining sealant and reaction products. This is typically done using clean water or solvents.


Sealants play a crucial role in the surface treatment of die-cast aluminum alloys, significantly enhancing the antioxidative performance of workpieces. By isolating the external environment, sealants effectively prevent oxidation and corrosion, extending the lifespan of aluminum alloy workpieces. When applying sealants, it is essential to carefully follow the manufacturer’s recommendations and operating guidelines to ensure the best protective results.


Post time: Dec-26-2023