DACROMET BOLTS

2026-11-07

1. Intshayelelo

Kubunjineli banamhlanje, amajoyinti abotshiweyo kufuneka axhathise yomibini imithwalo yomatshini kunye nokubola kokusingqongileyo. I-electro-galvanizing yemveli kunye ne-hot-dip galvanizing ibonelela ngokhuseleko lokuchasa umhlwa kodwa ikhathazwa yi-hydrogen embrittlement kwiibholiti zamandla aphezulu kunye nokuphazamiseka kwe-dimensional kwimicu echanekileyo. I-Dacromet coating, inkqubo ye-zinc-aluminium flake eyenziwe ngo-1970, iyoyisa le mida. Inika ukuxhathisa okugqwesileyo kokuhlwa, iphelisa umngcipheko wokuhombisa i-hydrogen, igcina imilinganiselo yomsonto, kwaye inika uzinzo lobushushu obuphezulu ukuya kuthi ga kwi-300 °C. Iibholiti zeDacromet ngoku zichazwe ngokubanzi kwiimoto, ulwakhiwo, amandla omoya, uloliwe, kunye namashishini aselwandle.

2. Yintoni i-Dacromet Coating?

I-Dacromet i-non-electrolytic, i-coating ye-zinc-flake yamanzi esekelwe emanzini equka i-micron-scale zinc kunye ne-aluminium flakes kwi-binder ye-inorganic. Emva kokufaka isicelo kunye nokunyanga, iiflake ezinqamlekileyo zenza umqobo obuninzi obuninzi onika umqobo wokukhuselwa kunye nokukhuselwa kwedini le-cathodic kwi-substrate yensimbi.

Iimpawu eziphambili:

Ubukhulu befilimu: ngokwesiqhelo yi-5–12 μm (ibhityile kakhulu kune-galvanizing yediphu eshushu)
Imbonakalo: iyunifomu yesilivere-ngwevu ukugqitywa kwesinyithi
Akukho mngcipheko we-hydrogen embrittlement (akukho kucholwa kweasidi okanye i-electrolysis)
Ukuchasana nokubola: rhoqo >1,000 iiyure zokutshiza ngetyuwa ukuya kumhlwa obomvu (ASTM B117)
Ukumelana nobushushu obuphezulu ukuya kuthi ga kwi-300 °C ngenkonzo eqhubekayo

Ukwaleka kusetyenziswa idip-spin (eqhelekileyo kwizibophelelo ezininzi), isitshizi, okanye idip-drain, emva koko inyangelwe ngokushushu ku- ~300 °C. Iidyasi ezingaphezulu ezizikhethelayo zongeza ngakumbi ukuxhathisa ukubola kunye nokulawula umlinganiso wokukhuhlana kokusebenza okungaguqukiyo kwetorque-tension.

3. Isishwankathelo seNkqubo yeCoating

Inkqubo eqhelekileyo yeebholithi inezigaba ezine eziphambili:

1.Ukulungiswa komphezulu: Ukukhutshwa kwealkaline kulandelwa kukucoca ngoomatshini xa kukho imfuneko. Ukunyuswa kweasidi kuyaphetshwa ukuthintela ukufunxwa kwehydrogen.

2.Ukusetyenziswa koKugquma: Amacandelo afakwe kwi-aqueous zinc-aluminium flake slurry (dip-spin kwi-bolts encinci) okanye i-sprayed; ukugqithisa kususwa yi-centrifugation yobukhulu obufanayo.

3. Ukunyanga: Ukubhaka malunga ne-300-320 °C kuguqula isibophelelo kwaye sidibanise iiflakes zesinyithi zibe yityabeka ebotshwe ngokuqinisiweyo.

4.Idyasi yoKhenketho / Isitywini: Isitywini esibhityileyo siphucula ukuthambisa, ukumelana neekhemikhali, kwaye sandise ngakumbi ukusebenza kwetyuwa-kutshiza.

Ngenxa yokuba inkqubo ayinayo i-electrolytic kwaye ayinayo i-asidi pickling, i-bolts-high-power bolts (iBakala 8.8, 10.9, 12.9 kunye ne-ASTM A490) inokufakwa ngaphandle komngcipheko we-hydrogen embrittlement yangaphakathi-inzuzo ebalulekileyo yokhuseleko kwi-electroplating yendabuko.

4. Izinto eziluncedo eziphambili zeDacromet Bolts

4.1 I-Corrosion ephezulu kunye nokusebenza okuchasene neRust

Ifilimu yeDacromet encinci (i-6-10 μm) ihlala imelana neeyure ze-1,000-2,000 zokuvavanywa kwetyuwa engathathi hlangothi ngaphambi kokuba kuvele umhlwa obomvu-amaxesha angama-7-10 angcono kune-electro-galvanizing eqhelekileyo. Isakhiwo se-flake esine-multi-layer sibonelela ngokhuseleko lomqobo ngelixa ii-zinc flakes zihambisa ukhuseleko lwe-cathodic lombingelelo. I-chromate passivation iphinda icothise ukubola kwaye inikeze ukuzinyanga okulinganiselweyo kwimikrwelo emincinci.

4.2 Akukho UkuGqibezwa kweHydrojeni

Iibholiti zamandla aphezulu zichaphazeleka kakhulu kwi-hydrogen embrittlement ukusuka kwi-asidi pickling kunye ne-electroplating, enokubangela ukulibaziseka kwe-brittle fracture. I-Dacromet iphelisa lo mngcipheko ngokupheleleyo. Ke ngoko ikhethwa kwizibophelelo ezibukhali ezinokuqina okuphezulu kwiinjini zeemoto, i-chassis, intsimbi yolwakhiwo, kunye neendibano ezinxulumene nokhuseleko.

4.3 Ukuchaneka kweDimensional & Thread Fit

Ngobunzima be-coating ye-5-12 μm kuphela, i-Dacromet ayitshintshi kakhulu ijometri yentambo. Amantongomane asemgangathweni angasetyenziswa ngaphandle kokucofa ngaphezulu. Ngokwahlukileyo, i-galvanizing eshushu-dip (40-80 μm) ihlala ifuna amantongomane akhethekileyo. Olu tyalo lubhityileyo lulungele ukuchaneka kweebholithi kunye neziqhoboshi ezicolekileyo.

4.4 Ukumelana nobushushu obuphezulu kunye nokuHlubana okuLawulweyo

I-Dacromet ihlala izinzile ukuya kwi-300 °C yenkonzo eqhubekayo, ingaphezulu kakhulu kwimida ye-electroplating (~ 120 °C) okanye i-galvanizing ye-hot-dip (~ 200 ° C). Ngeengubo eziphezulu ezifanelekileyo i-coefficient ye-friction inokulawulwa (ngokuqhelekileyo μ = 0.10-0.18), ukuqinisekisa ukunyanzeliswa kwe-clamp engaguqukiyo kunye nokuziphatha okuthembekileyo kokuqiniswa okuninzi.

5. Uthelekiso lweNtsebenzo

Itheyibhile engezantsi ishwankathela iiyantlukwano eziphambili phakathi kweDacromet kunye nonyango oluqhelekileyo lomphezulu lweebholiti:

Umgangatho wokuSebenza	Dacromet	Electro-Galvanizing	Hot-Dip Galvanizing
Ubutyebe obuqhelekileyo	5–12 μm	5–15 μm	40–80+ μm
Isitshizi setyuwa (ukuya kumhlwa obomvu)	1,000–2,000+ h	100–300 h	500–1,000 h
H₂ Embrittlement Risk	Akukho nanye	Phezulu (idinga ukubhaka)	Phakathi
Ubuninzi beTemp eqhubekayo.	≈ 300 °C	≈ 100–120 °C	≈ 200 °C
Ukuphazamiseka kwemisonto	Ubuncinci / Akukho	Phantsi	Kubalulekile
Iibholiti zokuqina okuphezulu	Kugqwesileyo (8.8–12.9)	Unyino / Umngcipheko	Ilinganiselwe
Imbonakalo	Iyunifomu yesilivere-ngwevu	I-zinc eqaqambileyo okanye eluhlaza okwesibhakabhaka	Irhabaxa, ingwevu

Itheyibhile 1: Ukusebenza okuthelekisayo kunyango oluqhelekileyo lomphezulu webholithi

I-Dacromet inikeza indibaniselwano ebalaseleyo yefilimu ebhityileyo, ukumelana nokugqwesa okugqithisileyo, umngcipheko we-hydrogen embrittlement ye-zero, kunye nekhono lobushushu obuphezulu-ukwenza ukuba kukhethwe kwizicelo ezininzi ezifuna i-fastener.

6. Usetyenziso oluqhelekileyo

Iibholiti ezigqunywe yi-Dacromet zisetyenziswa kakhulu apho ukhuseleko lomhlwa, ukhuseleko, kunye nokuchaneka komda kubalulekile:

Iimoto & nezoThutho: I-injini, i-chassis, i-suspension kunye ne-fasteners yomzimba (ingakumbi iBanga le-10.9 / 12.9).
Amandla omoya & Amandla: I-Tower, i-nacelle kunye neebholiti zesiseko kunxweme okanye kwi-industrial atmospheres.
Uloliwe kunye neziseko zoncedo: Iifasteners zokulandela umkhondo, iibhulorho kunye noqhagamshelo lwesakhiwo olufuna ubomi obude benkonzo.
Ulwakhiwo kunye noLwakhiwo lweNsimbi: Iibholiti zesakhiwo eziphakamileyo apho ukugalela intsimbi kungafunekiyo.
Ezaselwandle kunye ne-Offshore: Izinto ezivezwe kwisitshizi setyuwa kunye nokufuma okuphezulu (kaninzi kunye ne-topcoat ephuculweyo).
EzoLimo kunye neZixhobo eziManzi: Oomatshini abasebenza kumhlaba odlayo okanye kwiindawo ezingaphandle.

7. Imigangatho efanelekileyo kunye neziKhokelo zokuKhetha

I-Dacromet kunye neengubo ezifanayo ze-zinc-flake zigutyungelwe yimigangatho yamazwe ngamazwe kuquka i-ISO 10683 (I-Fasteners - i-non-electrolytically applied zinc flake coatings), EN 13858, ASTM F1136 / F1136M, kunye neendlela zokutshiza ityuwa ASTM B117 / ISO 9227. Iimfuno ezininzi zemoto ze-OEMic nazo zigcina iimvavanyo ezithile ze-automotic OEMs.

Xa ukhankanya iibholiti zeDacromet, iinjineli kufuneka ziqwalasele:

Ibanga lamandla: Ilungele i-8.8 nangaphezulu; rhoqo kunyanzelekile ukuba 10.9/12.9 iindawo ezikhuselekileyo zokhuseleko.
IKlasi yoMhlwa: Khetha ubunzima bokugquma, inani leedyasi kunye ne-topcoat ngokwendlela efunekayo yokutshiza ngetyuwa okanye umjikelo wovavanyo.
I-friction Coefficient: Cacisa idyasi ye-lubricity elawulwayo ukuba umthwalo obambekayo ohambelanayo ubalulekile.
Okusingqongileyo: Igqwesileyo kumashishini, iimoto kunye neendawo ezininzi zangaphandle; ukuvavanya iinkqubo ezityebileyo zokuvezwa okugqithisileyo elwandle.
Iindleko vs. Umjikelo woBomi: Ixabiso leyunithi ephezulu kunesiseko se-zinc plating sidla ngokulungiswa ubomi obude benkonzo kunye nokugcinwa okuphantsi.

8. Isiphelo

I-Dacromet bolts imele isisombululo esivuthiweyo, esiphezulu sokukhusela i-corrosion of fasteners. Isigqubuthelo seflake se-zinc-aluminium esibhityileyo sinikezela ukuxhathisa kwesitshizi setyuwa ukodlula lee electro-galvanizing yesiqhelo, kuphelisa ubungozi be-hydrogen embrittlement esongela iibholithi zokuqina, igcina imilinganiselo yentambo echanekileyo, kwaye imelana nobushushu obuphezulu ukuya kuma-300 °C.

Iinjineli kunye nabathengi abafuna ukusebenza okuthembekileyo kokuchasana nokugqwala kunye nokuchasana nokubola kwimoto, kwisakhiwo, amandla kunye nezicelo zemizi-mveliso, iibholithi ezigqunywe ngeDacromet zibonelela ngolungelelwaniso oluqinisekisiweyo lokuqina, ukhuseleko kunye nokuthembeka komda. Xa kucaciswe ngokuchanekileyo-ukulinganisa ibakala lokugubungela, i-topcoat kunye neempawu ze-friction kwindawo yenkonzo-zinegalelo kubomi becandelo elide, ukunciphisa ukugcinwa kunye nokuphucula ukuthembeka kwenkqubo yonke. Njengoko iimfuno zamandla aphezulu, izibophelelo ezihlala ixesha elide ziqhubeka zikhula, iingubo ze-zinc-flake ezifana ne-Dacromet zihlala zisisiseko sobunjineli bomphezulu wanamhlanje.

Ngaphambili. Okulandelayo.

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