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Hydrogen Embrittlement Prevention and Dehydrogenation Baking Specification For New Energy Battery Pack Bolts, Based On GB/T 3098.1
Hydrogen Embrittlement Prevention and Dehydrogenation Baking Specification For New Energy Battery Pack Bolts, Based On GB/T 3098.1
Hydrogen Embrittlement Prevention and Dehydrogenation Baking Specification For New Energy Battery Pack bolts, Based On GB/T 3098.1
Grade 10.9 and 12.9 high-strength bolts for battery packs easily absorb hydrogen during pickling and electroplating, leading to delayed cracking under load and serious safety hazards. This article provides full-process hydrogen control standards in accordance with GB/T 3098.1 to eliminate hidden dangers from production source.
1. Standard Dehydrogenation Baking Parameters For Coated Bolts
| Bolt Grade | Coating Type | Baking Temp | Holding Time | Max Delay Before Baking |
| 10.9 | Electro Galvanized | 210~230℃ | 4h | 4h after plating |
| 10.9/12.9 | Zinc-Nickel Alloy | 220~240℃ | 6h | 3h after plating |
| 12.9 | Mechanical Galvanized | 190~210℃ | 3h | 8h after coating |
2. Hydrogen Source Control In Pre-processes
1. Pickling neutralization control: Shorten hydrochloric acid soaking time, use weak alkali neutralization to reduce hydrogen absorption; 2. Electroplating current optimization: Low current pre-plating avoids pinholes and hydrogen penetration; 3. Time limit rule: Start baking within specified hours after plating to prevent deep hydrogen diffusion.
3. Non-destructive Crack Inspection Methods
1. Batch delayed tensile test: 3% samples loaded at 75% yield strength for 48h without cracks; 2. Full magnetic particle inspection for energy storage fasteners; 3. Complete process record traceability once fracture failure occurs.