Lowest cost. Beautiful, uniform appearance (black l anchor bolt). Low processing temperature, no risk of hydrogen embrittlement. No impact on part dimensional accuracy (extremely thin coating).

Disadvantages and precautions of black l shaped anchor:

Extremely poor corrosion resistance: They should never be used outdoors, in wet environments, in contact with chemicals, or in any corrosive environment. Reliance on secondary protection: Their rust prevention capabilities are heavily dependent on the quality of the subsequent oil impregnation. Once the oil film fails, rust will immediately begin to form. Poor wear resistance: During installation and tightening, wrenches can easily wear away the oxide film and oil film on the surface, causing rust to form first at the stress points. Not a "permanent" corrosion protection solution: They only provide short-term, primary protection.