How does water-based flux achieve good wettability?
Publish Time: 2025-01-09
Water-based flux is an auxiliary material used in the electronic manufacturing process. Its main function is to help solder adhere better to the surface of the material to be welded, promote wettability during welding, and thus improve welding quality.1. Chemical compositionWater-based flux is usually composed of water and a variety of active additives, including surfactants, chelating agents, acidic substances, etc. These ingredients work together to effectively remove oxides, dirt and other impurities on the surface to be welded, improve the affinity between solder and substrate, and thus improve wettability.2. Surface tension reductionSurfactants are one of the key components in water-based flux. They can reduce the surface tension of the liquid, making it easier for solder to spread on the surface to be welded, thereby improving wettability.3. Oxide removalOxides on the surface of the metal to be welded are one of the main factors affecting wettability. Acidic substances and chelating agents in water-based flux can react with oxides to decompose or dissolve them, thereby exposing a clean metal surface, which is conducive to the adhesion of solder.4. Temperature controlDuring the soldering process, proper temperature is critical to the activity and wettability of the flux. Water-based flux needs to be used within a certain temperature range to ensure that its components can fully function. Too low a temperature may make the flux inactive, while too high a temperature may cause the flux to evaporate quickly, affecting its performance.5. Coating technologyThe uniform coating of the flux on the surface to be soldered is also an important factor in achieving good wettability. Uneven coating may cause poor wetting in certain areas, affecting the overall soldering quality. Therefore, it is critical to choose a suitable coating method, such as spraying, dipping or brushing, to ensure that the flux is evenly covered on the surface to be soldered.6. Drying and activationBefore soldering, the flux needs to undergo a proper drying and activation process to ensure that its active ingredients can fully function. The length of drying time and the control of temperature will affect the effect of the flux.7. CompatibilityThe compatibility between the flux and the solder and the material to be soldered is also one of the factors that affect wettability. Selecting a flux that matches a specific solder and substrate can maximize wettability and soldering quality.Water-based flux effectively improves the wettability between the solder and the surface being soldered through its unique chemical composition and properties. This not only improves the quality and reliability of soldering, but also reduces possible problems that may occur during the soldering process, such as bridging, cold solder joints, and weak solder joints. In the electronics manufacturing industry, selecting the right water-based flux and applying it correctly is of great significance to ensure the high performance and long life of the product.
