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I-Dacromet-Coated Flange Bolts kunye neFlange Nuts
2026-10-29
1. Intshayelelo
Lonke ilungu elibolithiweyo lomelele njengelona qabane lalo libuthathaka. Ibhawunti yeflange ephezulu yokuqina edityaniswe nenati ye-hex engakhuselekanga idala a isibini galvanic, i-corrosion trap, kunye nokusilela kwintsimi yexesha elizayo. Eli nqaku lazisa isibini esihambelanayo - Iibholiti zeflange ezifakwe kwiDacromet (iibholiti ze-hex ezine-flange edibeneyo phantsi kwentloko) kunye I-Dacromet-coated flange nuts (i-hex nuts enekhola ye-flange ejikelezayo) - kwaye ichaza ukuba kutheni amalungu omabini edibeneyo kufuneka aphathe i-zinc-aluminium flake coating efanayo.
I-Dacromet coating - inkqubo ye-zinc-flake engekho ye-electrolytic echazwe yi ISO 10683 kwaye I-ASTM F1136 - ihambisa i-700 kwiiyure ze-1,000 zokuxhathisa ityuwa yokutshiza (i-ASTM B117 engathathi hlangothi yokutshiza ityuwa, i-NSS) ukuya kuqala umhlwa obomvu, kwifilimu encinci ye-8-12 μm, kunye no i-hydrogen embrittlement ingozi. Ifakwe rhoqo kwibholiti kwaye i-nut, ikhusela yonke inkqubo yokuqinisa i-threaded: imiphezulu yokuthwala, ubuso be-flange, kunye nemicu ethwele umthwalo wangaphakathi nangaphandle.
2. Amacandelo amabini
2.1 Iibholithi zeHex flange
Ibhawudi ye-hex flange yibhawunti yentloko enehexagon eneflange edityanisiweyo esetyhula (ubuso obakhelwe-ngaphakathi bewasha) kwindawo ethwele intsimbi engaphantsi kwentloko, ekumgangatho ophakathi. ISO 4162 / DIN 6921 kwaye I-GB/T 5789 / GB/T 16674. Iinketho zoyilo ziquka:
- Uluhlu oluncinci lweflange- i-compact bearing diameter yeendawo ezivaliweyo zebhonti;
- Uchungechunge olukhulu (olubanzi) lweflange- ukuthwala ububanzi obumalunga ne-1.5 × d, ehlisa uxinzelelo lwangaphezulu phantsi kwentloko kunye nokunciphisa ukubethelwa kwizinto ezithambileyo ezifana ne-aluminium castings;
- I-Serrated flange- amazinyo e-radial kwi-flange engaphantsi kwe-flange eluma kwindawo edibeneyo, eyandisa ukuxhathisa ukuzikhulula okubangelwa yi-vibration ngaphandle kwewasha yesitshixo esahlukileyo.
3. Kutheni iNkqubo eMatanisiweyo ibalulekile kuLawulo lokuMhlwa
Ibholithi egqunywe ngeflake ye-zinc ebaleka ingena kwindongomane okanye i-electro-plated nut yenza a isibini galvanic: iindawo ezimbini ezingafaniyo ezidibana ne-electrolyte (imvula, i-condensation, ityuwa yendlela). Umphezulu ongabekekanga kangako udla ngokukhethayo, uvelisa umhlwa omhlophe (imveliso ye-zinc oxidation) kwaye ekugqibeleni umhlwa obomvu (i-base-steel corrosion) kanye kwindawo ebaluleke kakhulu - iintambo ezithwala ukulayisha kwangaphambili. Ukugquma zombini i-bolt kunye ne-nut kunye nenkqubo ye-Dacromet efanayo kulinganisa amandla okutshatyalaliswa kunye nokususa amandla okuqhuba ukuhlaselwa kwe-galvanic.
Inkqubo yeDacromet ayibandakanyi i-asidi pickling kwaye akukho electrolytic yangoku, ngoko akukho hydrogen ye-athomu efakwe kwintsimbi. Oku kwenza kube yinto ekhethiweyo yomgangatho ophezulu we-flange bolts kunye namantongomane e-flange yeklasi yepropathi ye-10.9 kunye ne-12.9, apho i-hydrogen embrittlement (HE) yokungaphumeleli kwe-fasteners ye-electro-plated iyingozi ebhaliweyo.
4. Uthelekiso lweNtsebenzo yokugquma
| Inkqubo yokwambathisa (ibholt + nut, iklasi 8.8) | Ubungqingqwa obuqhelekileyo | Ukutshiza ityuwa kumhlwa omhlophe | Isitshizi setyuwa ukuya kumhlwa obomvu (NSS) | I-hydrogen embrittlement |
| Electro-galvanized Zn5 | 5 μm | ≈ 24 h | ≈ 72–96 h | Umngcipheko ophezulu |
| Electro-galvanized Zn12 | 12 μm | ≈ 72 h | ≈ 192 h | Umngcipheko ophezulu |
| Ukugalela oomatshini | 25–40 μm | ≈ 96 h | ≈ 400-500 h | Phantsi |
| I-Hot-dip yenziwe ngegalvanized | 45–85 μm | — | ≈ 720 h | Phantsi; imisonto idinga ukucofa kwakhona, i-nut oversize |
| I-Dacromet DAC 320 (Iklasi yesi-2) | 8mm | ≈ 240 h | ≈ 720 h | Ngokwenyani akukho nanye |
| Dacromet DAC 500 / emnyama | 10–12 μm | ≈ 480 h | ≈ 1,000 h | Ngokwenyani akukho nanye |
Enye inzuzo yokudipha: amandongomane ashushu-diphu kufuneka acofazwe ngokugqithisileyo, nto leyo enciphisa indawo yokucheba esebenzayo, ngelixa i-Dacromet-coated flange nuts zigcina umgangatho. 6H ukunyamezela intambo kunye namandla apheleleyo - ifilimu ebhityileyo, enzima igcina intambo ifanelekile, ngoko ke iibholiti kunye namantongomane zihlangana ngokukhululekileyo kunye nokukhuhlana okuhambelanayo kwaye akukho ukucaphuka yeendawo ezigqunyiweyo.
5. Ukuqukumbela
Iibholiti ze-flange ezigqunywe nge-dacromet kunye namantongomane e-flange zenza inkqubo yokuqinisa enobunjineli: ijometri ye-flange isasaza umthwalo we-clamp, icinezela i-vibration ekhululayo, kwaye ishenxisa i-washers eyahlukileyo, ngelixa i-zinc-aluminium edibeneyo yokugquma i-flake kumalungu ikhusela izibini ze-galvanic, itywina imimandla ye-crevice, ixhathisa i-rust ebomvu kunye ne-rust000 iiyure ezibomvu kunye ne-rust. igcina intsimbi eyomelele kakhulu ngaphandle kwe-hydrogen embrittlement. Owona mgaqo ubalulekileyo wokucacisa usahleli: odola iibholiti kunye namantongomane njengenye ehambelanayo, inkqubo ekhuselweyo ekumdleni.
