Liquid Coating: Uniform Adhesion and Wide Coverage, Providing a Protective Coat for Object Surfaces

Liquid coating, with its characteristics of uniform adhesion and wide coverage, has become a fundamental process for surface protection of objects. It utilizes the permeability and fluidity of liquid molecules to form a continuous and complete protective film on the surface of various substrates, resisting external erosion and extending the service life of objects.

The core of uniform adhesion lies in the leveling property and permeability of liquid coatings. After application, solvent-based coatings can automatically level with the volatilization of solvents, forming a coating with a thickness deviation of ≤5%. On the uneven surfaces of metal workpieces, the coating can penetrate into fine gaps of 0.1 mm, forming a dead-angle-free protection after curing. After electronic device casings are coated with liquid coatings, salt spray tests show that their corrosion resistance is 8 times higher than that of uncoated ones. More importantly, the wetting angle of liquid coatings on substrates is ≤30°, enabling them to closely adhere to various materials such as wood, plastic, and ceramics, with an adhesion force of over 5N/cm², solving the "exposure" problem that traditional powder coatings are prone to on complex curved surfaces.

The advantage of wide coverage is reflected in its adaptability to complex structures. For mechanical parts with deep holes and threads, liquid coatings can achieve 100% coverage through dip coating, with the inner wall coating thickness deviating from the outer surface by no more than 2 microns. In the coating of irregular components of automobile chassis, high-pressure airless spraying can make the coating penetrate into welds and bolt connections, forming a continuous protective film, and its protective area is 30% larger than that of brush coating. Practice in a construction machinery factory shows that after adopting liquid coating, the rust rate of structural parts has decreased from 25% to 3%, significantly reducing the cost of later touch-up painting.

This protective ability stems from the integrity and functionality of the coating. The continuous film formed by liquid coating can block the contact between water, oxygen and the substrate. On outdoor steel structures, an 80-micron-thick alkyd paint can provide 3-5 years of rust protection; on the surface of chemical equipment, the acid and alkali resistant coating of epoxy paint can resist the erosion of media with pH value 2-12. At the same time, the elasticity of the coating (elongation ≥150%) enables it to adapt to the thermal expansion and contraction of the substrate, avoiding cracking. During temperature cycles from -30℃ to 60℃, the coating remains well adhered.

From the clear paint protection of household wood products to the anti-corrosion coating of bridge steel structures, the uniformity of liquid coating ensures that weak parts are not missed, and its wide coverage adapts to the protection needs of complex structures. In easily overlooked areas such as the corners of medical devices and the interfaces of pipelines, the continuous coating is like an invisible armor, resisting wear, corrosion and aging for objects with "dead-angle-free protection", and has become a cost-effective and effective basic protection solution in the manufacturing industry.