Sodium-free particle technology drives the upgrade of aluminum alloy manufacturing

　　The sodium-free particulate remelting refining agent is a key chemical additive used in aluminum alloy melting processes to enhance the purity of molten aluminum and improve material properties. Its core mechanism of action and process characteristics can be summarized as follows:

　　I. Efficient Decontamination and Degassing Mechanism

　　Chemical Adsorption and Reaction

　　The porous structure and high specific surface area of the particles give them strong adsorption capabilities, enabling them to capture fine inclusions such as alumina (Al₂O₃) and aluminum nitride (AlN) from molten aluminum, forming aggregated clusters. Meanwhile, active components—such as fluoride and potassium salts—react with metallic impurities like sodium and calcium, producing low-melting-point compounds (e.g., NaF, CaF₂) or volatile chlorides (e.g., CaCl₂), which are then effectively removed via slag separation for thorough purification. For instance, at melting temperatures ranging from 700 to 780°C, this process can achieve impurity removal rates exceeding 70%, while simultaneously reducing hydrogen content by 80% to 90%, significantly minimizing porosity and inclusion defects in castings.

　　Synergistic Physical Flotation and Bubble Technology

　　When inert gases (such as nitrogen) are injected, the refining agent particles combine with the gas to form bubble clusters, which carry the adsorbed impurities upward toward the aluminum melt's surface. This creates a dry, powdery slag that easily separates from the molten aluminum. Additionally, the stirring action generated as the bubbles rise further enhances the contact area between the impurities and the refining agent, significantly improving the purification efficiency. Some formulations incorporate controlled-release technology, allowing for gradual component diffusion and extending the reaction period—thereby ensuring consistent purification performance throughout the entire process.

　　II. Material Performance Optimization

　　Improved Mechanical Properties

　　After refining, the purity of the molten aluminum is significantly improved, leading to a 20%-30% increase in tensile strength and a 15%-25% improvement in elongation. For instance, in high-strength aluminum alloys such as A356 and A380, the refining agent effectively eliminates grain boundary oxidation defects, enhancing material processing stability and preventing hot-rolling cracks. As a result, scrap rates are reduced by 20%-30%.

　　Improved Corrosion Resistance and Surface Quality

　　The sodium-free formula completely eliminates the "sodium embrittlement" phenomenon (grain boundary brittleness) caused by traditional sodium-containing refining agents, while also minimizing surface whitening and corrosion issues on aluminum materials. The refining process produces no toxic gases or fumes, and a dense protective layer forms on the surface of the molten aluminum, reducing the cooling rate by approximately 50%. This prevents secondary oxidation and enhances the consistent appearance of the final product.

　　3. Process Compatibility and Environmental Features

　　Multi-form and process compatibility

　　The product is available in two forms: powder (1 kg per bag) or cylindrical blocks (0.5 kg per piece), suitable for processes such as powder spraying, bell-jar pressing, or direct scattering. Dosage should be adjusted according to the size of the furnace: 0.1%–0.3% is recommended for large reverberatory furnaces, while 0.4%–0.6% is ideal for small crucible furnaces—ensuring a balance between cost-effectiveness and purification performance.

　　Environmental Protection and Operational Safety

　　The refining process emits no toxic gases, such as chlorine gas (Cl₂), minimizing risks to operators and equipment. Some formulations even utilize non-toxic ingredients, further reducing environmental impact and aligning with the growing trend of green manufacturing.

　　4. Typical Application Scenarios

　　High-end aluminum alloy manufacturing

　　Widely used in aerospace structural components, engine parts, and automotive wheel hubs—areas that demand materials with exceptionally high strength and superior surface quality. For instance, in phosphorus-modified aluminum alloys (such as A386) and high-magnesium alloys, refining agents can enhance the modifying effects of strontium and phosphorus modifiers, leading to optimized grain structures.

　　Electronic Packaging and Precision Components

　　Aluminum materials prepared for precision components such as chip heat-sink substrates are refined to remove impurities, ensuring excellent electrical conductivity and thermal stability while meeting the stringent requirement for high-purity aluminum liquid (oxide content ≤ 0.02%).