紧固件涂层系统完整指南。了解电镀锌、热镀锌、达克罗和其他防腐涂层。
Zinc Electroplating
Zinc electroplating is the most common coating: Process: - Electrolytic deposition of zinc onto fastener - Typical thickness: 8-12 microns - Clear or colored passivate top coat Properties: - Good corrosion protection in mild environments - Low cost - Good appearance - Some hydrogen embrittlement risk Applications: - Indoor applications - Mild outdoor exposure - Automotive under-hood - General manufacturing TradeGo zinc plated fasteners meet ASTM F1941 specifications.
Hot-Dip Galvanizing
Hot-dip galvanizing provides excellent corrosion protection: Process: - Fasteners dipped in molten zinc (450°C) - Zinc-iron alloy layers form metallurgically bonded coating - Typical thickness: 45-85 microns Properties: - Excellent corrosion resistance (20+ years in many environments) - Complete coverage including threads - Self-healing if damaged - Thicker coating affects dimensions Applications: - Outdoor construction - Coastal environments - Infrastructure (bridges, towers) - Africa outdoor applications TradeGo hot-dip galvanized fasteners meet ISO 1461/ASTM A153 specifications.
Dacromet and Geomet Coatings
Dacromet and Geomet are advanced coatings: Dacromet: - Water-based coating with aluminum and zinc flakes - Excellent corrosion resistance - Thin coating (8-12 microns) - No hydrogen embrittlement - Salt spray resistance: 500-1000 hours Geomet: - Similar to Dacromet but without chromium - Environmentally improved formulation - Comparable performance Applications: - Automotive chassis - Infrastructure - Marine applications - High-strength bolts