Dacromet-Coated Hex Bolts

2026-10-27

1. Mawu Oyamba

Mabowuti a Hex (mabowuti amutu wa hexagon) ndi ena mwa zomangira zomwe zimagwiritsidwa ntchito kwambiri pomanga, makina, kuphatikiza magalimoto, ndi zomangamanga. M'malo owononga - zomanga za m'mphepete mwa nyanja, zomera za mankhwala, misewu yayikulu, milatho, ndi nsanja zakunja zazitsulo - moyo wautumiki wa mgwirizano wotsekedwa nthawi zambiri umatsimikiziridwa osati ndi mphamvu ya chitsulo, koma ndi kulimba kwa zokutira zake zoteteza.

Chophimba cha Dacromet (chomwe chimadziwikanso kuti DACROMET, Dacromet zinc-flake coating, kapena zinc-aluminium flake coating) ndi madzi otsekemera otembenuza ndi otchinga omwe amagwiritsidwa ntchito ndi dip-spin kapena kupopera ndi kuchiritsidwa pa kutentha kochepa. Chiyambireni ku United States m'zaka za m'ma 1970 komanso kutukuka kwa mafakitale ku Japan ndi ku Ulaya, Dacromet yakhala njira yothetsera dzimbiri yoteteza ma bolts amphamvu kwambiri, makamaka m'magiredi 8.8 ndi kupitilira apo, pomwe zokometsera zachikhalidwe zotentha zimanyamula zoopsa za haidrojeni komanso zovuta zazikulu.

2. Kodi Dacromet-Coated Hex Bolt ndi Chiyani?

Dacromet-coated hex bolt ndi bawuti wamba wa hexagon (pa ISO 4014 / ISO 4017 / DIN 931 / DIN 933 kapena ASME B18.2.1) yomwe pamwamba pake idatetezedwa ndi zokutira za zinc-flake zomwe zimagwiritsidwa ntchito kuchokera ku slurry yokhala ndi madzi:

Zinc flakes ndi aluminium flakes- yogwira dzimbiri-chitetezo chotchinga (chiŵerengero wamba padziko 75% Zn / 25% Al ndi olimba okhutira);
Mankhwala a chromium kapena ma passivators opanda chromium- perekani kudzichiritsa nokha pazigawo zoyamba;
Zomangira ma inorganic binders ndi cellulose thickeners- amangiriza ma flakes kukhala wandiweyani, wotsatira filimu;
Deionized madzi- chonyamulira sing'anga, kupanga njira VOC wopanda ndi chilengedwe wochezeka.

Chophimbacho chimagwiritsidwa ntchito ndi kuviika (kapena kupopera) ndikutsatiridwa ndi centrifugal spinning kuchotsa slurry ochulukirapo, kenako amachiritsidwa pafupifupi 280-330 ° C kwa mphindi 20-40. Kuzungulira kozungulira kangapo (kawirikawiri) kumamanga makulidwe a 6-10 μm; olemera makalasi kufika 12-15 μm.

Makhalidwe Ofunikira a Njira ya Dacromet

Mbali	Kufotokozera
Kuchiritsa kutentha	280-330 ° C (kutsika kwa kutentha kwa kalasi 10.9 / 12.9 bolts)
Kupaka makulidwe	6-15 μm (yodalira m'kalasi), yowonda kwambiri kuposa galvanizing yotentha (45-85 μm)
Kuchuluka kwa haidrojeni	Palibe pickling asidi, palibe electroplating - pafupifupi palibe hydrogen embrittlement chiopsezo
Kukwanira kwa mutu wa Hex	Kupaka kopyapyala kofananako kumateteza ulusi wa geometry - mabawuti ogwirizana ndi matepi wamba ndi mtedza
Mbiri ya chilengedwe	Madzi, opanda mpweya wa VOC; Zosiyanasiyana zopanda chromium (Cr³⁺/Cr⁶⁺-zopanda) zilipo
Magetsi conductivity	Filimu yochititsa chidwi, yoyenera kuyika maziko ofunikira

Table 1. Makhalidwe ofunika kwambiri a Dacromet yokutira ndondomeko.

3. Njira Yotetezera Kuwonongeka

Dacromet imateteza gawo lapansi lachitsulo kudzera munjira zitatu zowonjezera:

1.Barrier zotsatira- zinc ndi aluminiyamu flakes kupanga filimu laminated ndi tortuous njira kuti kwambiri kubweza malowedwe a madzi, mpweya, ndi chloride ayoni.

2.Chitetezo cha nsembe- nthaka ndi yocheperapo kuposa chitsulo; Pang'onopang'ono kapena m'mphepete mwake, zinki zimawononga mwadala komanso zimateteza chitsulo chowonekera.

3.Kuchita chidwi/kudzichiritsa- ma passivators amapanga mafilimu a insoluble oxide pa malo owonongeka, "kuchiritsa" zilonda zazing'ono ndikuchedwetsa dzimbiri loyera ndi kupanga dzimbiri lofiira.

Kuphatikizika kwa njira zitatuzi kumafotokoza chifukwa chake zokutira za Dacromet nthawi zonse zimapereka maola 500-1,000 ku dzimbiri lofiyira pakuyezetsa kutsitsi kwa mchere wosalowerera ndale (pa ISO 9227 / ASTM B117) pa makulidwe a 6-10 μm - kangapo magwiridwe antchito ofanana ndi makulidwe a electro-galvanizing.

4. Mapeto

Maboti a hex okhala ndi Dacromet amaphatikiza mphamvu zamakina zamakalasi amtundu wa 8.8-12.9 okhala ndi mawonekedwe opyapyala, ofananirako, otetezedwa ndi haidrojeni, komanso chitetezo choteteza zachilengedwe. Ndi ntchito yopopera mchere kangapo kuposa kupangira magetsi pamagetsi pang'ono a makulidwe a dip-dip galvanizing, Dacromet yakhala njira yosasinthika ya zomangira zamphamvu kwambiri pamapangidwe ofunikira, mphamvu, ndi mayendedwe.

Kwa ogula ndi mainjiniya, zigamulo zazikuluzikulu ndi kalasi yakuphimba (kukhuthala ndi maola a NSS), mtundu wa chromate (Cr³⁺ vs Cr-free), kuwongolera kokwanira, komanso kutsatira ISO 10683 / ASTM F1136. Dacromet hex bolt yodziwika bwino imapereka kukhulupirika kwanthawi yayitali - ngakhale m'malo ovuta kwambiri.

Palibe. Kenako.

Nkhani zaposachedwa