Performance Specifications	Blackened L Shaped Anchor Bolts	Blue-White Zinc-Plated L-Shaped Anchor Bolts
Corrosion Protection Mechanism	Passive Isolation (Fe₃O₄ film + Oil film)	Active Sacrifice (Zinc layer) + Passive Isolation (Passivation film)
Salt Spray Test	Only 6–12 hours (bare film); 24–48 hours after oil application	24–96 hours (standard thickness); up to 120 hours
Applicable Environments	Dry indoor environments; low-corrosion conditions; short-term use	Humid indoor environments; mild outdoor conditions; non-coastal / non-chemical environments
Service Life	Dry Indoor: 6–12 months (requires periodic re-oiling)	Indoor: 3–5 years; Mild Outdoor: 1–3 years

Black L-Shaped Anchor Bolts: Ideal Applications

Indoor Dry Environments: Securing precision instruments, internal machine tool components, electrical distribution cabinets, and automated equipment. Temporary Structures / Reusable Applications: Scaffolding, formwork supports, temporary exhibition booths, and equipment installation/commissioning (can be de-rusted and re-oiled for repeated use). Uniform Aesthetic Requirements: Black-colored equipment/frames, optical instruments, and internal components of high-end machinery (features a matte black finish with no glare). Welding-Friendly Scenarios: When used as embedded parts for welding, the blackened surface coating does not compromise weld quality, eliminating the need for additional surface preparation.