Corrosion: Corrosion (氧化)
Deterioration of metal zipper parts through chemical reaction with moisture, salt, sweat or cleaning agents, appearing as discolouration, white rust or red rust. Plating porosity, thin coating, base metal quality and surface contamination are common causes. Corrosion stains fabric and reduces strength and appearance. Prevention includes adequate plating thickness, good rinsing, protective packaging and salt spray testing to verify resistance before shipment.