Iibholiti ze-Hex ze-Dacromet-Coated

2026-10-27

1. Intshayelelo

Iibholiti zeHex ezigqunywe yiDacromet (1)

Lonke ilungu elibolithiweyo lidabi lokulwa nomhlwa. I-hex bolt (i-hexagon head cap screw) inokuba sesona sibophelelo sixhaphakileyo kwihlabathi, kodwa xa sele sifakwe kwibhulorho, kwinqaba yokuhambisa, okanye isityalo sekhemikhali, sihlaselwa ngokukhawuleza kukufuma, ioksijini, i-ion ye-chloride, kunye ne-sulfur dioxide. Umhlwa - kuqala umhlwa omhlophe (imveliso ye-zinc oxidation), ngoko umhlwa obomvu (i-iron oxide) - ihamba ngaphaya kwendawo yokuthwala, ingena kwiintambo, kwaye ekugqibeleni ibambe i-nut, yenza buthathaka umthwalo we-clamp, kwaye itshabalalise i-joint.

I-Dacromet coating (ekwabizwa ngokuba yi-DACROMET, i-zinc-flake coating, okanye i-non-electrolytic zinc-aluminium flake coating) yaphuhliswa ngokuchanekileyo ukuphumelela eli dabi. Inika iibholiti ze-hex, ii-studs, kunye ne-hex nuts kunye neewasha ezibhityileyo, iyunifomu, isikrweqe esingena-hydrogen esisinda ngaphezu kweeyure ezingama-700 zokuvavanywa kwetyuwa yesitshizi (NSS) - amaxesha amaninzi ukuxhathisa umhlwa kwe-electro-galvanizing kubukhulu obufanayo.

2. Iziseko ezingundoqo: I-Hex Bolt kwi-Bolted Joint

I-hex bolt isebenza nge nut (okanye umngxuma ocofiweyo) ukubopha iindawo ezimbini okanye ngaphezulu kunye. Ingqibelelo yomdibaniso ixhomekeke kwi ukulayisha kwangaphambili (i-clamp load) yaziswa ngexesha lokuqiniswa, elilawulwa ngokusetyenziswayo torque, intambo yokulinganisa, kunye ne i-friction coefficient (μ) phakathi kwemigangatho yokuthwala kunye nemisonto. Kwindibano elawulwa yitorque, iinjineli ziguqula ulayisho lwangaphambili lube lixabiso letorque kusetyenziswa nut factor (K ≈ 0.12–0.16 kwi-lubricated zinc-flake coated fasteners).

Amacandelo okukhwelana okuqhelekileyo kwindibano ebholithiweyo abandakanya:

Iibholiti ze-hex / izikrufu zehex cap- intambo epheleleyo (DIN 933 / ISO 4017) okanye intambo engaphelelanga (DIN 931 / ISO 4014), iklasi yepropathi 8.8, 10.9, okanye 12.9;
Hex nuts- I-ISO 4032 yamantongomane aqhelekileyo okanye i-ISO 4033 encinci / i-jam nuts, iklasi ehambelana nebholiti;
Iiwasha eziflethi(DIN 125) kunye iiwasha zasentwasahlobo (DIN 127) - ukusabalalisa umthwalo wokuthwala kunye nokongeza ukuxhathisa ukungcangcazela;
Imisonto kunye neentonga ezinemisonto- udibaniso lwe-flanged kunye neendibano ze-bolted;
Amantongomane eFlange kunye neebholiti zeflange- kunye neeflange zokuzala ezidibeneyo kwii-substrates ezithambileyo.

Ngalinye kula macandelo kufuneka labelane ngendlela efanayo yokukhusela umhlwa; ibholiti yeDacromet edityaniswe nendongomane ecacileyo ye-zinc idala a isibini galvanic oko kubingelela i-nut kuqala.

Iibholiti zeHex ezigqunywe yiDacromet (2)

3. Ukuchasana nokuTyalwa: I-Dacromet vs. Enye i-Bolt Finishes

Ukunyamezela kokutshizwa kwetyuwa (ISO 9227 / ASTM B117, iiyure ukuya kwirust ebomvu) luphawu loshishino lokhuseleko lokutya okukhawulezileyo.

Ukugqiba / inkqubo yokwaleka	Ukutyeba	Iiyure ukuya kwirust ebomvu (NSS)	Umhlwa omhlophe (NSS)	I-hydrogen embrittlement	Amanqaku
I-Plain (imibala yobuqu, i-oyile)	—	< 24 h	—	Akukho nanye	Ukusetyenziswa kwangaphakathi kuphela
Ukufakwa kweZinc, ichromate eluhlaza (Zn3)	5 μm	≈ 48 h	12–24 h	Phezulu	Iindleko eziphantsi, iimpahla zabathengi
Ukufakwa kweZinc, i-passivate engqindilili (Zn12)	12 μm	≈ 192 h	96–168 h	Phezulu	Hayi yeklasi ≥ 10.9
Ukugalela oomatshini	20–50 μm	300–800 h	200–400 h	Phantsi kakhulu	Ilungele iindawo ezinkulu
I-Hot-dip galvanizing (HDG)	45–85 μm	500–1,500 h	200–500 h	Phantsi	Imisonto ifuna ukucofa kwakhona
Iklasi yeDacromet 2	8mm	≈ 720 h	300–500 h	Akukho nanye	As-cut umsonto ukuchaneka
I-Dacromet Class 3 / emnyama	10–12 μm	≈ 1,000 h	500–720 h	Akukho nanye	Automotive OEM benchmark

I-Dacromet iphinda iphumelele i-zinc plating kwi Uvavanyo lweKesternich (i-SO₂ corrosion, ISO 6988 - i-atmospheres yezoshishino kunye nemvula ye-asidi), kwi uvavanyo lwe-cyclic corrosion (CCT: ityuwa edibeneyo yokutshiza / ukufuma / ukomisa), kwi ukuhambelana kwegalvanic kunye ne-aluminium substrates (enkosi kumxholo we-aluminium flake), kwi ukukhwela ibhayisekile lobushushu (ifilimu engaphiliyo imelana nenkonzo ye-120–300°C, apho amadyungudyungu atyatyekiweyo), kwaye ukumelana neekhemikhali kwiityuwa zendlela kunye neekhemikhali zokuqhawula i-icing.

4. Ukuqukumbela

Kwi-hex bolts kunye ne-hardware yabo yokukhwelana, i-Dacromet coating ihambisa ibhalansi engcono yokukhusela i-corrosion, ukuchaneka komatshini, kunye nokuthembeka kwendibano ekhoyo namhlanje: ukunyamezela kwetyuwa yokutshiza ukuya kwiiyure ze-1,000, ukungakhuseleki kwi-hydrogen embrittlement, i-geometry yentambo egciniweyo, kunye nokukhuhlana okuzinzileyo kwindibano elawulwa yitorque. Naphi na apho indawo edityanisiweyo kufuneka iphile emvuleni, ityuwa, kunye nexesha, ingcaciso ekufuneka uyikhumbule yile: i-hex bolt ephezulu, i-zinc-flake (i-Dacromet) igqunywe, i-ISO 10683 / ASTM F1136 iyahambelana.

Andinayo. Okulandelayo.

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