Liquid Coating: Good Compatibility with Substrates, Efficient Coating on Both Wood and Metal

Liquid coating, with its wide adaptability to substrates, has become a flexible choice for cross-material surface treatment. Whether it is porous wood or dense metal, it can achieve efficient coating and stable adhesion through formula adjustment and process adaptation, playing a role in protection and decoration in various scenarios.

The compatibility with wood is reflected in the balance between penetration and sealing. The cellulose derivatives contained in water-based wood paint can penetrate into wood vessels (up to 0.5-1 mm in depth), and form hydrogen bond combinations with wood fibers after curing, with adhesion reaching more than 3N/cm². In the coating of solid wood floors, liquid coatings can seal the micro-cracks on the wood surface. Tests have shown that it can reduce the water absorption rate of the floor by 60%, while retaining the natural texture of the wood - compared with sticker decoration, its touch is more real, and it avoids the problem of blistering after heating. For wood such as pine that is prone to resin exudation, special liquid primers can neutralize resin acids, prevent "yellowing" in later coating, and increase the uniformity of coating color by 40%.

The efficient coating of metal substrates relies on chemical conversion and mechanical anchoring. The phosphating treatment before coating makes the metal surface form a porous zinc phosphate film. The resin in the liquid coating can penetrate into the pores to form "mechanical anchor points", with adhesion reaching 5N/cm², far exceeding the 3N/cm² of powder coating. On cold-rolled steel plates, the salt spray resistance time of epoxy liquid coatings reaches 1000 hours, which is 8 times that of untreated steel plates; for aluminum alloys, which are easily oxidized materials, acid primers can neutralize the oxide layer, ensuring that the coating remains well adhered after anodizing treatment. Data from an auto parts factory shows that after adopting liquid coating, the rework rate of metal parts has dropped from 12% to 3%, mainly due to the adaptability of the coating to different grades of steel.

This compatibility is also reflected in the unified treatment of cross-material assemblies. In the furniture industry, the combined parts of metal brackets and wooden panels can be coated with the same liquid coating at one time, avoiding color differences caused by different processes; in the field of medical devices, the liquid coating of plastic handles and metal connectors can maintain the same surface finish (Ra ≤ 0.8μm), and both can pass the alcohol wipe test (no peeling after 500 times).

The compatibility of liquid coatings stems from the diversity of formula systems: resins containing hydroxyl groups can be selected for polar substrates (wood, concrete), and coupling agents can be added for non-polar substrates (plastics, metals). This "one coating for multiple applications" feature not only simplifies the coating process of multi-material workpieces (efficiency increased by 30%), but also reduces equipment investment costs, making it a preferred solution in the manufacturing industry that balances flexibility and economy. From the warm luster of redwood furniture to the industrial texture of machine tool shells, liquid coating, with its excellent compatibility, enables different substrates to obtain ideal surface effects.