1.What are the advantages of nano-galvanizing technology in environmental protection and energy saving?
Eliminate acid pollution: Nano-galvanizing is usually carried out at room temperature or medium temperature, completely abandoning the strong acid pickling pre-treatment required for traditional HDG, eliminating the generation of high-risk pollutants such as acid mist and waste acid liquid from the source, and complying with the most stringent green manufacturing and environmental regulations.
Significantly reduce energy consumption: Traditional HDG needs to be operated in a high-temperature molten zinc bath of about 450°C, which consumes a lot of energy. Nano-galvanizing can be completed at close to room temperature or medium temperature conditions, and energy consumption can be reduced by more than 80%.
Efficient use of resources: Traditional HDG zinc layer is thicker, and there is zinc liquid splashing and zinc slag generation during the production process, and the zinc utilization rate is relatively low. Nano-galvanizing can accurately control the coating thickness (usually 5-30μm), and the material utilization rate can exceed 95%, which significantly saves precious zinc resources.
Very low/zero VOC: Many nano-galvanizing systems use water-based formulas, and the emission of volatile organic compounds is extremely low or even zero, which is better than the VOC release of solvent-based plating agents in traditional processes.
2.What are the advantages of nano-galvanizing technology in coating performance?
Excellent corrosion resistance: With the same or even thinner coating thickness, the corrosion resistance of nano-galvanizing far exceeds that of traditional HDG. The core principle is that nanoparticles can effectively fill the microscopic pores of the coating, forming a denser and more tortuous barrier, which greatly hinders the penetration path of water, oxygen and corrosive ions. The salt spray test life can reach 1500-3000 hours or even higher, which is 2-3 times that of traditional HDG.
Super strong adhesion: The nano-galvanized layer often forms a chemical bond or a stronger mechanical interlocking with the base metal, and the adhesion can usually reach more than 20MPa. This greatly improves the coating's resistance to mechanical damage, making it less likely to break during transportation and installation, ensuring the integrity of the anti-corrosion.
Excellent uniformity and coverage: Nano-galvanizing can evenly cover all surfaces of complex workpieces, including deep holes, narrow gaps, inner corners, and weld edges, which are difficult to handle or prone to thin layers with traditional HDG, achieving protection without dead angles.
Excellent flexibility: Traditional HDG layers are brittle and tend to crack when bent beyond a certain angle. Nanocomposite coatings generally have good flexibility and can withstand 180° bending without cracking, making them particularly suitable for metal components that require deformation or earthquake resistance.
Higher heat resistance: Traditional galvanized layers will melt and fail at about 420°C. Some nano-galvanizing technologies can withstand temperatures of 600°C or even higher, which is more advantageous in high-temperature environments or as a base for fire-retardant coatings.
3.What are the advantages of the processing performance of galvanized steel using nano-galvanizing technology?
Breaking through size limitations: Traditional HDG is limited by the size of the galvanizing tank. Large or extra-long components often need to be galvanized in sections, leaving joints that require additional anti-corrosion treatment. Nano-galvanizing technology (especially spraying and brushing processes) can be constructed in the factory or on-site to achieve overall seamless anti-corrosion of large components.
Convenient and efficient repair capability: Traditional HDG components need to be returned to the galvanizing plant for re-plating after welding or damage, which is costly and time-consuming. Nano-galvanized materials can usually be easily repaired on-site, have a fast curing speed, can quickly restore anti-corrosion performance, and can reduce maintenance costs by more than 70%.
Improved compatibility with dissimilar metals: The nano-galvanized layer itself has a good passivation isolation effect. When it comes into direct contact with dissimilar metals such as aluminum and stainless steel, the risk of galvanic corrosion is lower than that of traditional HDG, which can simplify the connection design.
Better compatibility with fire retardant coatings: Some nano-galvanized layers (especially inorganic silicate systems) can be directly used as excellent bases for steel structure fire retardant coatings. The two have strong adhesion and no additional matching primer is required, which simplifies the coating process.
4.What are the long-term economic benefits of nano-galvanized materials?
Saves expensive environmental treatment (wastewater, waste acid, waste gas) costs.
Reduces zinc raw material consumption.
Reduces energy costs.
On-site construction and repair saves huge costs and time costs for transportation, disassembly, re-plating and re-installation of large components.
Most importantly, its ultra-long anti-corrosion life (theoretically up to 50 years or more) and excellent durability significantly reduce the cost of maintenance, renovation and even replacement throughout the life cycle of the building. Comprehensively calculated, its long-term return on investment (ROI) is usually better than traditional HDG.
5.What are the recommendations for application scenarios in high-rise buildings?
Strengthening of key nodes
Nano-galvanized repair coating (instead of cold-sprayed zinc) is used in welds and bolt connection areas to avoid corrosion at weak points.
Complex spatial structures
Nano-galvanized spraying is used on the inner wall of tubular components and truss nodes to solve the problem that HDG cannot be fully covered.
Sustainable buildings
Pursue LEED certification projects and use nano-galvanizing to meet the zero-pollution construction score.
Super high-rise exposed steel structure
Nano-galvanizing + self-cleaning functional coating to reduce curtain wall maintenance costs.