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Dacromet-Coated Hexagon Socket Countersunk taub hau Bolts
2026-11-02 IB
| Lub Dacromet-coated hexagon socket countersunk taub hau ntsia liaj qhov rooj sib txuas ua ke lub taub hau-fitting countersunk ntsia hlau taub hau nrog zinc-aluminium flake txheej uas xa 720-1,000 xuab moos ntawm ntsev-txhaj tshuaj tiv thaiv - ob peb zaug ntev dua li cov pa electro-plated zinc bolts. Kab lus no piav qhia txog lub bolt geometry, cov txheej txheem Dacromet txheej, nws cov txheej txheem tiv thaiv corrosion, thiab nws piv nrog lwm cov kev kho xeb xeb rau cov ntsia hlau thiab cov ntsia hlau. |
1. Taw qhia: Vim li cas Corrosion Protection Matters rau Bolts thiab Screws
Fasteners - bolts, screws, txiv ntseej, thiab cov ntxhua khaub ncaws - yog cov khoom tiv thaiv corrosion-tiv taus tshaj plaws hauv txhua qhov sib koom ua ke. Lub rusted bolt poob preloads, seizes nyob rau hauv nws threaded qhov, thiab nws thiaj li compromises tus qauv kev ncaj ncees ntawm tag nrho cov sib dhos. Nyob rau hauv ib puag ncig marine, kev loj choj, hnub ci mounting lug, thiab sab nraum zoov machinery, zoo tib yam zinc-plated screws yuav qhia dawb xeb nyob rau hauv lub lis piam thiab liab xeb nyob rau hauv lub hlis.
2. Khoom Geometry: Lub Hexagon Socket Countersunk Head Bolt
| Xov Size | Lub taub hau taub (dk) | Lub taub hau qhov siab (k) | Hex Qhov (s) | Tensile Strength Class | Ntev Ntev |
| M5 × 0.8 | 10.0 hli | 2.8mm ib | 4 hli | 8.8 / 10.9 | 10-60 hli |
| M6 × 1.0 | 11.4mm 3 | 3.3mm ib | 5 hli | 8.8 / 10.9 | 12-80 hli |
| Luas M8 × 1.25 | 15.0mm 3 | 4.4mm ib | 6 hli | 8.8 / 10.9 | 16-100 hli |
| M10 × 1.5 | 18.5mm 3 | 5.4mm ib | 8mm ib | 8.8 / 10.9 | 20-120 hli |
| Qhov Loj: M12 × 1.75 | 21.5mm 3 | 6.5mm ib | 10 mm | 8.8 / 10.9 | 25-150 hli |
Qhov tseem ceeb geometry qhov zoo ntawm hom ntsia hlau no:
- Flush nto- lub taub hau countersunk tsis protrude, tshem tawm cov ntsiab lus snag thiab tso cai rau mating qhov chaw zaum tiaj tus.
- Siab torque muaj peev xwm- lub qhov (socket) hexagon koom nrog rau lub ntsej muag sib cuag, xa 30-50% ntau dua torque dua li lub slotted lossis Phillips tsav ua ntej stripping.
- Xov kev koom tes- daim ntawv puv tshuab threads (los yog tus kheej-tapping threads rau daim ntawv-hlau daim ntawv thov) muab muaj zog axial clamping ntawm lub bolted sib koom.
3. Dacromet txheej: Nws ua haujlwm li cas
Dacromet yog lub npe lag luam uas tau dhau los ua cov lus lag luam dav dav rau zinc-aluminium flake coatings siv los ntawm dip-spin los yog tshuaj tsuag thiab kho ntawm kwv yees li 300 ° C. Tsis zoo li electroplating, cov txheej txheem tsis yog-electrolytic, yog li txheej txheej qhia tsis muaj hydrogen embrittlement - qhov tseem ceeb ntawm kev nyab xeeb rau lub zog siab ntawm qib 10.9 thiab siab dua.
Cov txheej yog cov nyiaj-grey matrix ntawm overlapping zinc thiab txhuas flakes (feem ntau 0.1-0.5 µm tuab, 15-20 µm tag nrho) sib koom ua ke los ntawm inorganic chromium compound binder. Nws anti-corrosion mechanism yog peb npaug:
4. Anti-Corrosion Performance: Cov ntaub ntawv ntsev tsuag
Qhov ntsuas ntsuas ntsuas rau kev tiv thaiv xeb yog qhov nruab nrab ntsev tshuaj tsuag (NSS) ib qho ISO 9227 / ASTM B117. Table 3 piv Dacromet-coated screws nrog cov kev kho mob saum npoo feem ntau.
Table 3 - Corrosion resistance piv (NSS test, teev rau thawj xim liab)
| Kev kho saum npoo | Hom Thickness | Dawb Rust | Liab Rust | Hydrogen Embrittlement Risk | Tus nqi Index |
| Ntshiab zinc plating (Zn) | 5-8 µm | 24-96 : kuv | 150-300 hnub | Nruab nrab | 1.0 |
| Yellow zinc plating (Zn-Cr) | 5-8 µm | 96-200 : kuv | 300-500 h | Nruab nrab | 1.2 |
| Kub-dip galvanizing (HDG) | 50-100 µm | — | 1,000–2,000 h | Tsawg | 1.5 |
| Dacromet (1 lub tsho tiv no) | 5-8 µm | 480-720 Nws | 720-1,000 Nws | Tsis muaj | 1.8 |
| Dacromet (2-3 lub tsho tiv no) | 10-24 µm | 1,000+ h | 1,500-2,500 h | Tsis muaj | 2.2 |
| Dacromet + sab saum toj foob | 10-24 µm | 1,200+ h | 2,000-3,000 h | Tsis muaj | 2.5 |
5. Xaus
Lub Dacromet-coated hexagon socket countersunk taub hau ntsia liaj qhov rooj daws ob qhov teeb meem qub tshaj plaws hauv xov fastening - xeb thiab protrusion - nyob rau hauv ib feem. Lub countersunk geometry muab dej yaug, huv si, tsis muaj snag-free sib koom nrog lub siab-torque hexagon tsav, thaum lub zinc-aluminium flake txheej muab kev xyiv fab thiab kev tiv thaiv kev tiv thaiv corrosion kav ntev li 1,000 xuab moos lossis ntau dua hauv kev sim tshuaj ntsev, tsis muaj hydrogen embrittlement. Rau engineers thiab buyers specifications screws thiab bolts rau sab nraum zoov, marine, los yog kev thauj mus los ib puag ncig, no fastener chav kawm ntawv muaj ib tug ntawm qhov zoo tshaj plaws corrosion-tiv thaiv-rau-tus nqi piv muaj nyob rau hauv niaj hnub bolting technology.
