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.

Full Process Specification Of Zinc-Nickel Coating For Grade 12.9 New Energy Battery Pack Bolts, Based On GB/T 10125