Dacromet-Coated Hex Bolts

2026-10-27

1. Mawu Oyamba

Mgwirizano uliwonse wa bolt ndi nkhondo yolimbana ndi dzimbiri. Boliti ya hex (hexagon head cap screw) ikhoza kukhala chomangira chofala kwambiri padziko lonse lapansi, koma ikayikidwa mu mlatho, nsanja yotumizira, kapena chomera chamankhwala, imawukiridwa nthawi yomweyo ndi chinyezi, oxygen, ayoni a chloride, ndi sulfure dioxide. Dzimbiri - choyamba dzimbiri loyera (zinc oxidation mankhwala), ndiye dzimbiri lofiira (iron oxide) - imadutsa pamtunda, imalowa mu ulusi, ndipo pamapeto pake imagwira mtedza, imafooketsa katunduyo, ndikuwononga mgwirizanowo.

Dacromet yokutira (yomwe imatchedwanso DACROMET, zokutira za zinc-flake, kapena zokutira zopanda electrolytic zinc-aluminium flake) zidapangidwa ndendende kuti apambane nkhondoyi. Imapatsa ma hex bolts, ma studs, ndi ma hex mtedza wofananira ndi zida zochapira zida zoonda, zofananira, zopanda haidrojeni zomwe zimatha kupitilira maola 700 pakuyezetsa mchere wosalowerera ndale (NSS) - kangapo kukana kwa dzimbiri kwa electro-galvanizing pa makulidwe omwewo.

2. Zoyambira Zomangamanga: The Hex Bolt mu Joint Bolted

Bawuti ya hex imagwira ntchito ndi nati (kapena bowo) kuti imangirire magawo awiri kapena kuposerapo palimodzi. Kukhulupirika kwa olowa kumatengera kutsitsa (clamp load) yomwe imayambitsidwa panthawi yolimbitsa, yomwe imayendetsedwa ndi kugwiritsidwa ntchito torque, phula la ulusi, ndi kukangana kokwana (μ) pakati pa malo okhala ndi ulusi. Pamsonkhano woyendetsedwa ndi torque, mainjiniya amasintha zomwe chandamaleyo ikufuna kukhala mtengo wa torque pogwiritsa ntchito nut factor (K ≈ 0.12–0.16 zomangira zomata za zinki-flake).

Zigawo zofananira zokweretsa pagulu la bolt ndi:

Zomangira za hex / hex cap cap- ulusi wonse (DIN 933 / ISO 4017) kapena ulusi wochepa (DIN 931 / ISO 4014), kalasi ya katundu 8.8, 10.9, kapena 12.9;
Hex mtedza- ISO 4032 mtedza wamba kapena ISO 4033 mtedza wopyapyala / kupanikizana, kalasi yofananira ndi bawuti;
Makina ochapira athyathyathya(DIN 125) ndi ochapira masika (DIN 127) - kugawa katundu wonyamula ndikuwonjezera kukana kugwedezeka;
Zolemba ndi ulusi ndodo- zolumikizana ndi ma flanged ndi misonkhano yolumikizidwa;
Mtedza wa flange ndi ma flange bolts- okhala ndi ma flanges ophatikizika a magawo ofewa.

Chilichonse mwa zigawozi chiyenera kugawana njira yotetezera dzimbiri; bawuti ya Dacromet yophatikizidwa ndi nati wamba wa zinc imapanga a banja la galvanic amene amapereka nsembe nati poyamba.

3. Kutsutsa kwa Corrosion: Dacromet vs. Other Bolt Finishes

Kupirira kwa kupopera kwa mchere (ISO 9227 / ASTM B117, maola mpaka dzimbiri lofiira) ndiye chizindikiro chamakampani choteteza dzimbiri.

Kumaliza / kupaka system	Makulidwe	Maola mpaka dzimbiri lofiira (NSS)	White dzimbiri (NSS)	Kuchuluka kwa haidrojeni	Zolemba
Choyera (chodzikongoletsa, chopaka mafuta)	—	<24h	—	Palibe	Kugwiritsa ntchito m'nyumba kokha
Zinc plating, blue chromate (Zn3)	5 mbm	≈ 48h	12-24 h	Wapamwamba	Mtengo wotsika, katundu wogula
Zinc plating, passivate wandiweyani (Zn12)	12 mm	≈ 192 h	96-168 h	Wapamwamba	Osati a kalasi ≥ 10.9
Mechanical galvanizing	20-50 mamilimita	300-800 h	200-400 h	Zotsika kwambiri	Zabwino kwa zigawo zazikulu
Hot-dip galvanizing (HDG)	45-85 m	500-1,500 h	200-500 h	Zochepa	Ulusi umafunika kudulidwanso
Dacromet Class 2	8 mm	≈ 720 h	300-500 h	Palibe	Monga-kudula ulusi molondola
Dacromet Kalasi 3 / wakuda	10-12 m	≈ 1,000 h	500-720 h	Palibe	Magalimoto OEM benchmark

Dacromet imaposanso zinc plating mu Kesternich mayeso (SO₂ corrosion, ISO 6988 - mlengalenga wa mafakitale ndi mvula ya asidi), mu kuyesa kwa cyclic corrosion (CCT: kuphatikiza mchere kutsitsi / chinyezi / kuyanika), mu kuyanjana kwa galvanic ndi magawo a aluminiyamu (chifukwa cha aluminium flake), mu kutentha njinga (filimu yachilengedwe imapirira ntchito ya 120-300 ° C, pomwe zokutira zokhala ndi matuza), komanso kukana mankhwala ku mchere wamsewu ndi mankhwala ochotsera icing.

4. Mapeto

Kwa ma hex bolts ndi zida zawo zokwerera, zokutira za Dacromet zimapereka chitetezo chabwino kwambiri cha dzimbiri, kulondola kwamakina, ndi kudalirika kwa msonkhano komwe kulipo masiku ano: kupirira kwa mchere mpaka maola 1,000, kutetezedwa kwa hydrogen embrittlement, ulusi wosungidwa wa geometry, ndi mikangano yokhazikika pamisonkhano yoyendetsedwa ndi torque. Kulikonse komwe cholumikizira cha bawudi chiyenera kukhala ndi mvula, mchere, ndi nthawi, zomwe muyenera kukumbukira ndi izi: bawuti yamphamvu kwambiri ya hex, zinc-flake (Dacromet) yokutidwa, ISO 10683 / ASTM F1136 yogwirizana.

Palibe. Kenako.

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