Q:How can the process be more environmentally friendly?
A:1. Chromium-free passivation technology completely replaces chromate process
Technological breakthrough: trivalent chromium passivation, titanium-vanadium compound passivation, and organic polymer passivation have been industrialized.
Standards: GB/T 15675-2020 requires that the hexavalent chromium content in the trivalent chromium passivation film be less than 0.1μg/cm², and adds quantitative indicators for salt spray testing (such as 85μm coatings must pass 2000 hours of testing).
Cost optimization: The cost of chromium-free passivation liquid has dropped from 120 yuan/liter in 2018 to 50 yuan/liter in 2025, driving the industry penetration rate to exceed 80% 2.
2. Popularization of water-based paints and powder coatings
VOC emission reduction: Traditional solvent-based paints are gradually replaced by water-based paints.
Innovation in powder coating: The electromagnetic brush method achieves controllable powder coating thickness of 18-250μm, is solvent-free and has excellent scratch resistance, and has been applied to home appliance panels.
Q:How to upgrade coating performance?
A:1. Nanotechnology reshapes the coating structure
Self-repairing coating: Add nano-silicon dioxide and polymer to the passivation solution to form a microcapsule structure. When the coating is scratched, the repair agent is released, and the salt spray test life is extended by 50%.
Graphene composite coating: Introducing graphene nanosheets into the zinc coating, the corrosion resistance is increased by 3 times (salt spray test up to 3000 hours), and the hardness is increased from HV 200 to HV 350. It has been used in marine wind power equipment.
2. High-strength steel coating technology breakthrough
High-temperature annealing and rapid cooling: For advanced high-strength steel above 1500MPa, the surface silicon and manganese enrichment is controlled through the pre-oxidation-reduction process to solve the problem of coating adhesion. It has been applied to automotive hot forming parts.
Zinc-aluminum-magnesium coating replaces traditional zinc plating: Zn-19Al-6Mg coating shows ultra-high performance of "white rust appearance time > 5000 hours" in salt spray test, and the risk of hydrogen embrittlement is reduced by 70%, making it the preferred material for new energy vehicle battery packs.
Q:How to innovate production technology?
A:1. Intelligent full-process control
Digital enterprise brain: Zhuye Nonferrous uses AI algorithms to optimize zinc smelting parameters, increasing zinc recovery from 93% to 97%, reducing energy consumption by 18%, and realizing full-process automation such as robot automatic slag removal and casting.
Virtual simulation and predictive maintenance: The Lian Steel cold rolling project uses three-dimensional modeling to simulate the airflow distribution in the annealing furnace, reducing NOx emissions from 80mg/Nm³ to 30mg/Nm³, and predictive maintenance reduces equipment downtime by 40%.
2. Short process and high-efficiency technology
Integrated plating unit: The hot-dip color coating same-line technology developed in Europe eliminates the oiling process after galvanizing and the degreasing process before color coating, reducing investment costs by 15%-30%, and has been applied to the production of building curtain wall substrates.
Fast curing technology: UV curing shortens the color coating drying time from 3 minutes to 1 second and reduces energy consumption by 90%.
Q:What changes have occurred in the application areas?
A:1. New energy and high-end manufacturing
Special coating for photovoltaic brackets: Aluminum-silicon (Al-Si) steel plates remain stable at 550℃, and their weather resistance is better than traditional galvanizing, becoming the mainstream material for photovoltaic brackets, with a market share of 25% per year.
Lightweighting of new energy vehicles: Zinc-aluminum-magnesium coating (PosMAC) is used for battery pack shells, and there is no coating cracking in the -40℃ to 85℃ cycle test, replacing aluminum alloy to reduce costs by 20%.
2. Building and infrastructure upgrades
Self-cleaning building panels: Titanium dioxide-based nano-coatings enable galvanized corrugated steel sheets to achieve self-cleaning in rainwater.
Smart response coating: Thermochromic coatings can change the reflectivity according to the ambient temperature, reducing building energy consumption by 15% in summer.
Q:What are the characteristics of the overall technological trends?
A:Environmental protection, improved production efficiency, circular economy