Wide-temperature color Nickel-Free Sealer

Wide-temperature color Nickel-Free Sealer LX-C6629

Wide-temperature color Nickel-Free Sealer LX-C6629 is a light yellow, semi-transparent liquid formulated from a carefully balanced blend of metal salts, complexing agents, buffering agents, stabilizers, penetrating agents, ash suppression agents, dispersants, and surfactants. It is specifically designed for sealing anodic oxide films on aluminum and aluminum alloys, including colored oxide films, delivering a smooth surface feel. This product achieves true wide-temperature applicability while remaining entirely nickel-free and fluoride-free. It contains no heavy metals such as nickel, cobalt, lead, chromium, or cadmium, fully meeting environmental protection requirements and completely eliminating the hazards that nickel-based sealers pose to worker health, the environment, and aluminum alloy substrates. Depending on specific quality requirements, the operating temperature can be selected, with higher temperatures yielding superior sealing performance. This flexibility reduces bath waste caused by the need to change tanks for different requirements. Within the normal working range, the product offers advantages such as fast sealing speed, low consumption, and strong resistance to bath impurities. Sealed profiles exhibit increased oxide film hardness, enhanced brightness, and strong corrosion resistance.

Process Parameters

For optimal performance, the concentration of LX-C6629 should be maintained at 4 to 6 grams per liter, with the balance made up of deionized water. The operating temperature ranges from 25 to 95 degrees Celsius, while the pH should be controlled between 4.8 and 5.8. Sealing time is typically 1.0 to 1.5 minutes per micrometer of oxide film thickness, and should be reasonably adjusted according to actual film thickness.

Bath Liquid Maintenance

Proper bath maintenance is essential for consistent results. The concentration of the sealant should be determined based on regular laboratory analysis of the bath liquid. During production, the pH should be strictly controlled between 4.5 and 5.5. If the pH rises too high, dilute acetic acid can be used for adjustment; if the pH drops too low, sodium acetate or dilute ammonia can be used to bring it back into range.

Precautions

LX-C6629 is a weakly acidic agent and should be kept away from contact with alkaline substances. It is hygroscopic and sensitive to moisture, so proper storage is important. In regions where winter temperatures are low, the bath temperature should not fall below 20 degrees Celsius, as lower temperatures will significantly slow the sealing speed and reduce production efficiency.

Packaging, Storage, and Transport

The product is packaged in 25-kilogram plastic drums. During storage and transport, it should be protected from heat and moisture to maintain its stability and effectiveness.

Performance Benefits

LX-C6629 provides excellent fixation of pigments in anodized aluminum color films. It effectively seals the pores of anodic oxide films on aluminum and aluminum alloys, improving the hardness, brightness, and corrosion resistance of the oxide layer. Treated surfaces feel smooth and show no signs of frosting, water marks, or reduced abrasion resistance. The concentration, temperature, time, and pH during use all have a significant impact on the final sealing effect, and should be carefully controlled to achieve optimal results.

Composition and Formula Context

As a nickel-free sealer, LX-C6629 belongs to a category of products that vary widely in their application methods and performance characteristics. Different types are available for normal temperature, high temperature, wide temperature, low temperature, and color sealing applications. The formulation of LX-C6629 is based on a synergistic combination of non-nickel metal salts, such as lithium or magnesium-based compounds, which hydrolyze to form precipitates that fill and seal the anodic pores. These metal salts are supported by complexing and buffering agents that stabilize the bath and maintain the critical pH range, as well as surfactants and penetrating agents that ensure uniform wetting and deep penetration into the pore structure. Ash suppression agents and dispersants are incorporated to prevent surface smut formation, particularly at higher temperatures, ensuring a clean, frost-free finish. This carefully balanced composition allows LX-C6629 to operate effectively across a wide temperature range while maintaining environmental compliance and superior sealing performance.