1.What are the principles of chromium-free passivation technology?
Silane system: Si-O-Si network structure forms a dense film
Zirconium salt/titanium salt system: Zr/Ti oxyalkyl chelates with the matrix
Graphene composite film: Two-dimensional sheet physical barrier + cathodic protection
Molybdate system: MoO₄²⁻ oxidation self-repair
2.What is the green galvanizing process?
Hot-dip galvanizing by hydrogen reduction (replacing pickling)
Process: cold-rolled strip → hydrogen reduction furnace → direct galvanizing
Advantages: Eliminate hydrochloric acid pickling, avoid acid mist & waste acid liquid; higher surface activity, zinc layer adhesion increased by 15%.
Ultra-low aluminum zinc bath
Function: Reduce zinc slag generation by 30%, extend zinc pot life, and reduce heavy metal consumption
Electromagnetic field assisted galvanizing
Technology: The zinc pot applies an alternating magnetic field to refine the grains
Effect: The zinc layer is thinned by 10% and has equivalent corrosion resistance, saving 800 tons of zinc per production line per year
3.What are the types and principles of bio-based anti-rust technology?
Plant oil derivatives: Castor oil is esterified and modified to form a molecular membrane.
Chitosan-nano SiO₂: natural polysaccharide + inorganic nanocomposite barrier.
Microbial inhibitor: Bacillus subtilis secretes corrosion-inhibiting peptides.
4.How many types of low-carbon energy-saving processes are there?
Low temperature galvanizing (430-440℃)
Compared with the traditional 460℃ process, it saves 12% energy and reduces CO₂ emissions by 15 tons per thousand tons of steel
Pulse air knife control
Compressed air consumption is reduced by 40%, and the uniformity of zinc layer is ±1.5g/m²
Zinc vapor recovery system
Condensation recovery > 85% of evaporative zinc, annual recovery value exceeds 2 million yuan/production line
5.What does circular economy technology refer to?
Zinc slag electrolytic regeneration
Recovery rate>95%, regenerated zinc purity 99.99%.
Recycling of passivation waste liquid
Zirconium passivation waste liquid purification and regeneration, metal recovery rate 90%.