Release time：2020-01-16 18:44 Browse：
EU RoHS/REACH Directives: Traditional hexavalent chromium (Cr6+) plating is restricted due to its high toxicity and carcinogenicity, while trivalent chromium (Cr3+) is low-toxicity and complies with global environmental standards.
China’s Environmental Policies: Stricter regulations on heavy metal pollution make trivalent color zinc a preferred eco-friendly option, avoiding trade barriers.
Improved Corrosion Resistance: With sealing treatments (e.g., blue or black passivation), trivalent color zinc can withstand 500+ hours of neutral salt spray testing (white rust), meeting industrial requirements.
Aesthetics & Adhesion: Provides uniform colors (e.g., blue-white, iridescent) for better appearance, ideal for exposed long screws (e.g., outdoor equipment, construction).
Cost Efficiency: Though slightly higher upfront, compliance reduces long-term risks, and economies of scale are narrowing cost gaps.
Eco-Conscious Clients: Industries like automotive, electronics, and solar energy require green-certified supply chains (e.g., Apple, Tesla), making trivalent zinc a must.
Competitive Edge: Manufacturers using eco-friendly processes gain premium market access.
Enhanced Plating Stability: Modern trivalent chromium processes ensure uniform coating, even on long screws with complex geometries (e.g., threaded sections), reducing hydrogen embrittlement risks.
Color Variety: Multiple passivation options (e.g., olive drab, black zinc) meet color-coding needs (e.g., IKEA’s furniture screws).
Lower Environmental Impact: Easier wastewater treatment reduces compliance costs.
Recyclability: Trivalent chromium minimizes contamination in metal recycling, supporting circular economy goals.
Solar Mounting Systems: Long screws require weather resistance; trivalent zinc + sealing resists UV and moisture.
EV Battery Packs: Hexavalent chromium-free plating prevents circuit corrosion.
