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Full Process Specification Of Zinc-Nickel Coating For Grade 12.9 New Energy Battery Pack Bolts, Based On GB/T 10125
Full Process Specification Of Zinc-Nickel Coating For Grade 12.9 New Energy Battery Pack Bolts, Based On GB/T 10125
Full Process Specification Of Zinc-Nickel Coating For Grade 12.9 New Energy Battery Pack bolts, Based On GB/T 10125
Zinc-nickel coating is the mainstream anti-corrosion solution for outdoor energy storage battery packs with superior salt spray resistance. Improper plating process leads to hydrogen embrittlement and delayed fracture of high-strength bolts. This article standardizes full plating and inspection procedures complying with GB/T 10125.
1. Performance Matching Of Three Coatings For Energy Storage
| Coating Type | Min Thickness | Salt Spray Hours Without Red Rust | Hydrogen Embrittlement Risk | Applicable Scenario |
| Electro Galvanized | 8μm | 500h | High | Inland indoor energy storage cabin |
| Mechanical Galvanized | 12μm | 800h | Low | Inland outdoor small storage cabinet |
| Zinc-Nickel Alloy | 10μm | 1500h | Medium, dehydrogenation baking required | Coastal & marine energy storage container |
2. Key Zinc-Nickel Plating Control Points
1. Pre-treatment: Weak alkaline electrolytic degreasing, shorten acid pickling time to reduce hydrogen absorption; 2. Two-stage plating: Low current pre-plating then main plating, nickel content controlled 12%~15%; 3. Mandatory dehydrogenation baking: 220℃ for 6 hours within 3 hours after plating; 4. Chrome-free black passivation plus water-based sealant for environmental compliance.
3. Rectification For Common Coating Defects
1. Black spots on surface: Filter plating tank and replace passivation solution; 2. Edge coating peeling: Extend pre-plating time and adjust current density; 3. Early red rust in salt spray test: Increase plating time and sealant thickness.