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Dacromet-Coated Flange Bolts le Flange Nuts
2026-10-29
1. Selelekela
Lenonyeletso le leng le le leng le nang le bolt le matla joalo ka molekane oa lona ea fokolang. Bolt e matla e phahameng e kopantsoeng le nate e tloaelehileng ea hex e sa sireletsoeng e theha banyalani ba galvanic, leraba la kutu, le ho hlōleha ha tšimo nakong e tlang. Sengoliloeng sena se hlahisa para e tšoanang - Liboutu tsa flange tse koahetsoeng ka Dacromet (liboutu tsa hex tse nang le flange ea bohlokoa tlasa hlooho) le Linate tsa flange tse koahetsoeng ka Dacromet (li-hex nuts tse nang le molala o potolohang oa flange) - mme o hlalosa hore na ke hobane'ng ha litho tse peli tsa lenonyeletso li lokela ho jara seaparo se tšoanang sa zinc-aluminium flake.
Ho roala ha Dacromet - ts'ebetso ea zinc-flake e seng electrolytic e hlalosoang ke ISO 10683 le ASTM F1136 - e fana ka lihora tse 700 ho isa ho tse 1,000 tsa ho hanyetsa ha letsoai (ASTM B117 neutral letsoai spray, NSS) ho ea pele mafome a makgubedu, ka filimi e tšesaane ea 8-12 μm, e nang le no ho ruruha ha haedrojene kotsi. E sebelisoa khafetsa ho bolt le nut, e sireletsa tsamaiso eohle ea khoele ea khoele: libaka tse jereng, lifahleho tsa flange, le likhoele tse jarang moroalo ka hare le kantle.
2. Likaroloana tse peli
2.1 Liboutu tsa Hex flange
Bolt ea hex flange ke bolt ea hlooho ea hexagon e nang le letlapa le chitja le kopaneng (sefahleho sa washer se hahelletsoeng ka hare) karolong e ka tlase ea hlooho, e lekantsoeng ISO 4162 / DIN 6921 le GB/T 5789 / GB/T 16674. Likhetho tsa moralo li kenyelletsa:
- Letoto la li-flange tse nyane- bophara ba compact bearing bakeng sa libaka tse koaletsoeng tsa bolt;
- Letoto la li-flange tse kholo (tse pharaletseng).- e nang le bophara ba hoo e ka bang 1.5 × d, e theolang khatello ea holim'a hlooho le ho fokotsa ho kenngoa ka har'a lisebelisoa tse bonolo tse kang li-castings tsa aluminium;
- Srated flange- meno a marang-rang a ka tlas'a flange a lomang ka holim'a metsi a koaletsoeng, a eketsa ho hanyetsa ho itšehla thajana ka lebaka la ho sisinyeha ntle le washer ea senotlolo e arohaneng.
3. Ke Hobane'ng ha Tsamaiso ea Matched e le Taba ea Taolo ea Corrosion
Bolt e koahetsoeng ka zinc-flake e kenang ka har'a nate e se nang letho kapa e entsoeng ka electro-plated e banyalani ba galvanic: libaka tse peli tse sa tšoaneng tse kopanang le electrolyte (pula, condensation, letsoai la litsela). Sebaka se seng se setle haholo se senya ka mokhoa o ikhethileng, se hlahisang mafome a masoeu (lihlahisoa tsa zinc oxidation) mme qetellong mafome a makgubedu (base-steel corrosion) sebakeng sa bohlokoa ka ho fetisisa - likhoele tse jarang pele. Ho roala bolt le linate ka mokhoa o tšoanang oa Dacromet ho lekana le bokhoni ba ho senya le ho tlosa matla a ho khanna bakeng sa tlhaselo ea galvanic.
Ts'ebetso ea Dacromet ha e kenyelle ho khethoa ha acid ebile ha ho na motlakase oa motlakase, kahoo ha ho na hydrogen ea athomo e kenngoa ka tšepe. Sena se etsa hore e be khetho e tloaelehileng bakeng sa li-bolts tsa flange tse matla le linate tsa flange tsa sehlopha sa thepa ea 10.9 le 12.9, moo ho hlōleha ha hydrogen embrittlement (HE) ea li-fasteners tsa electro-plated ke kotsi e ngotsoeng.
4. Coating Performance Papiso
| Sistimi ea ho roala (bolt + nut, sehlopha sa 8.8) | Botenya bo tloaelehileng | Ho fafatsa letsoai ho mafome a masoeu | Ho fafatsa letsoai ho isa ho rust e khubelu (NSS) | Ho tlosoa ha hydrogen |
| Elektro-galvanized Zn5 | 5 μm | ≈ 24 h | ≈ 72–96 h | Kotsi e phahameng |
| Motlakase-galvanized Zn12 | 12 μm | ≈ 72 h | ≈ 192 h | Kotsi e phahameng |
| Mechanical galvanizing | 25-40 μm | ≈ 96 h | ≈ 400-500 h | Tlase |
| Ho qoela ka masenke | 45–85 μm | — | ≈ 720 h | Tlase; likhoele li hloka ho tlatsoa hape, linate li feteletse |
| Dacromet DAC 320 (Sehlopha sa 2) | 8mm | ≈ 240 h | ≈ 720 h | Ha e le hantle ha ho letho |
| Dacromet DAC 500 / e ntšo | 10–12 μm | ≈ 480 h | ≈ 1,000 h | Ha e le hantle ha ho letho |
Molemo o mong oa kopano: linate tse chesang tse nang le galvanized nuts li tlameha ho fetisoa ho feta boholo, e leng ho fokotsang sebaka se sebetsang sa ho kuta, athe linate tse koahetsoeng ke Dacromet li boloka maemo a tloaelehileng. 6H khoele mamello le matla a feletseng - filimi e tšesaane, e thata e boloka khoele e lekana, kahoo liboutu le linate li bokana ka bolokolohi ka likhohlano tse sa fetoheng 'me ha ho joalo. ho hlatsa ya bokahodimo bo koahetsoeng.
5. Qetello
Li-bolts tse koahetsoeng ka dacromet le linate tsa flange li theha tsamaiso e entsoeng ka boenjiniere: geometry ea flange e fana ka thepa ea li-clamp, e thibela ho sisinyeha ho lokoloha, 'me e tlosa li-washer tse arohaneng, ha li-flake tsa zinc-aluminium tse kopantsoeng ho litho ka bobeli li thibela banyalani, ho tiisa libaka tsa marang-rang, ho hanela mafome a masoeu, le ho hanela mafome a masoeu. e boloka tšepe e matla haholo e se na hydrogen embrittlement. Molao o le mong oa bohlokoa ka ho fetisisa o sala: laela liboutu le linate joalo ka sistimi e ts'ireletsoang ke kutu.
