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Dacromet-Coated Hex Bolts
2026-10-27 : kuv
1. Taw qhia
Txhua bolted sib koom ua ke yog kev sib ntaus sib tua tiv thaiv corrosion. Lub hex ntsia liaj qhov rooj (hexagon taub hau hau ntsia hlau) tej zaum yuav yog cov fastener tshaj plaws nyob rau hauv lub ntiaj teb no, tab sis thaum nws yog ntsia rau hauv ib tug choj, ib tug kis tau tus mob ntauwd, los yog ib tug tshuaj nroj tsuag, nws yog tam sim ntawd tawm tsam los ntawm noo noo, oxygen, chloride ions, thiab sulfur dioxide. Rust - ua ntej dawb xeb (zinc oxidation khoom), ces liab xeb (hlau oxide) - nkag mus thoob plaws cov kabmob ntawm cov kabmob, nkag mus rau hauv cov xov, thiab thaum kawg txeeb cov txiv ntoo, ua rau lub cev tsis muaj zog, thiab rhuav tshem cov kev sib koom ua ke.
Dacromet txheej (tseem hu ua DACROMET, zinc-flake txheej, los yog non-electrolytic zinc-aluminium flake txheej) tau tsim meej los yeej qhov kev sib ntaus sib tua no. Nws muab hex bolts, studs, thiab txuam hex txiv ntseej thiab ntxhua khaub ncaws nyias, zoo li, tsis muaj hydrogen-dawb armor uas muaj sia nyob ntau dua 700 xuab moos ntawm cov tshuaj ntsev nruab nrab (NSS) kuaj - ob peb zaug ntawm corrosion kuj ntawm electro-galvanizing ntawm tib lub thickness.
2. Fastener Basics: Lub Hex Bolt nyob rau hauv ib tug Bolted Joint
Lub hex ntsia liaj qhov rooj ua haujlwm nrog cov txiv ntoo (los yog lub qhov tapping) kom clamp ob lossis ntau qhov chaw ua ke. Kev sib koom ua ke ntawm kev ncaj ncees nyob ntawm qhov preload (clamp load) qhia thaum lub sij hawm nruj, uas yog tswj los ntawm kev thov lub zog, lub suab paj nruag, thiab cov kev sib txhuam coefficient (μ) nruab nrab ntawm cov kabmob thiab cov xov. Hauv kev sib dhos torque-tswj, engineers hloov lub hom phiaj preload rau hauv tus nqi torque siv lub txiv ntoo factor (K ≈ 0.12–0.16 rau lubricated zinc-flake coated fasteners).
Tej yam mating Cheebtsam nyob rau hauv ib tug bolted los ua ke muaj xws li:
- Hex bolts / hex cap screws- tag nrho xov (DIN 933 / ISO 4017) lossis ib nrab xov (DIN 931 / ISO 4014), khoom vaj khoom tsev 8.8, 10.9, lossis 12.9;
- Hex txiv ntseej- ISO 4032 tus qauv txiv ntoo lossis ISO 4033 nyias / jam txiv ntoo, chav kawm sib phim rau lub ntsia liaj qhov rooj;
- Cov tshuab ntxhua khaub ncaws(DIN 125) thiab caij nplooj ntoos hlav washers (DIN 127) - faib bearing load thiab ntxiv kev co kuj;
- Studs thiab threaded rods- rau flanged kev sib txuas thiab los ntawm-bolted los ua ke;
- Flange ceev thiab flange bolts- nrog ib qho kev coj tus kheej flanges rau mos substrates.
Txhua yam ntawm cov khoom no yuav tsum sib koom ua ke nrog kev tiv thaiv corrosion; ib tug Dacromet bolt ua ke nrog ib tug dawb zinc-plated txiv ntseej tsim ib tug galvanic ob peb uas txi txiv ua ntej.
3. Corrosion Resistance: Dacromet vs. Lwm Bolt Finishes
Ntsev tshuaj tiv thaiv (ISO 9227 / ASTM B117, teev rau liab xeb) yog kev lag luam tus qauv rau kev tiv thaiv kev tiv thaiv corrosion.
| Finish / txheej system | Thickness | Sijhawm rau xim liab (NSS) | Dawb xeb (NSS) | Hydrogen embrittlement | Sau ntawv |
| Plain (tus kheej xim, oiled) | — | <24 h | — | Tsis muaj | Kev siv sab hauv tsev nkaus xwb |
| Zinc plating, xiav chromate (Zn3) | 5m ua | ≈ 48 h | 12-24 hnub | Siab | Tus nqi qis, cov khoom siv |
| Zinc plating, tuab passivate (Zn12) | 12m ua | ≈ 192 h | 96–168 : kuv | Siab | Tsis yog rau chav kawm ≥ 10.9 |
| Mechanical galvanizing | 20-50 m | 300-800 hnub | 200-400 h | Tsawg heev | Zoo rau qhov loj |
| Kub-dip galvanizing (HDG) | 45-85 hli | 500-1,500 h | 200-500 h | Tsawg | Xov yuav tsum rov tapping |
| Dacromet Chav Kawm 2 | 8m ua | ≈ 720 h | 300-500 h | Tsis muaj | Raws li-txiav xov precision |
| Dacromet Class 3 / dub | 10-12 m | ≈ 1,000 h | 500 – 720 h | Tsis muaj | Automotive OEM qauv |
Dacromet kuj ua tau zoo tshaj zinc plating hauv Kesternik xeem TS EN ISO 6988 Kev lag luam cua thiab cov kua qaub nag - Ntu 1: Kev txhim kho corrosion cyclic corrosion kuaj (CCT: ua ke ntsev tsuag / av noo / ziab), hauv galvanic compatibility nrog aluminium substrates (ua tsaug rau cov ntsiab lus aluminium flake), hauv kub caij tsheb kauj vab (cov zaj duab xis inorganic withstands 120-300 ° C kev pab cuam, qhov twg organic coatings blister), thiab nyob rau hauv tshuaj tiv thaiv rau txoj kev ntsev thiab de-icing tshuaj.
4. Xaus
Rau hex bolts thiab lawv mating hardware, Dacromet txheej muab qhov zoo tshaj plaws sib npaug ntawm kev tiv thaiv corrosion, mechanical precision, thiab kev cia siab ntawm kev sib dhos muaj nyob rau niaj hnub no: ntsev tsuag endurance mus txog 1,000 teev, tiv thaiv hydrogen embrittlement, khaws cia xov geometry, thiab kev sib txhuam ruaj khov rau torque-tswj sib dhos. Txhua qhov chaw sib koom ua ke yuav tsum muaj sia nyob los nag, ntsev, thiab lub sijhawm, qhov tshwj xeeb yuav tsum nco ntsoov yog: High-strength hex ntsia liaj qhov rooj, zinc-flake (Dacromet) coated, ISO 10683 / ASTM F1136 raws.
