Dacromet Hexagonal Bolts-Kenyelletso e Felletseng ea Li-Fasteners tse Hanyetsang ho Corrosion tse Phahameng ka ho Fetisisa 

2. Dacromet Coating ke Eng?

Dacromet ke mokhoa o sa tloaelehang oa ho roala o entsoeng ka li-flakes tse ntle haholo tsa zinki, phofo ea aluminium, le binder e thehiloeng ho chromium (kapa e se nang chromium). E sebelisoa e le phepelo e thehiloeng metsing 'me e phekotsoe hoo e ka bang 300 ° C, e etsa binder ea amorphous e kopanyang li-flakes tsa tšepe tse fetang ka har'a filimi e sireletsang. Botenya bo tloaelehileng ba ho roala ke 4-8 μm feela - bo tšesaane haholo ho feta hot-dip galvanizing (50-80 μm) - leha ho le joalo bo fana ka tšireletso e phahameng ea kutu. Sebaka se phethiloeng se na le ponahalo e tšoanang ea tšepe ea silevera-grey.

Moetso oa mantlha: zinki flakes (60-80%) bakeng sa tšireletso ea sehlabelo, phofo ea aluminium (5-15%) bakeng sa thepa e ntlafetseng ea litšitiso, binder ea inorganic e fetang holim'a metsi, le metsi a hloekisitsoeng e le mochine o tsamaisang thepa.

3. Melemo ea Bohlokoa ea Dacromet Hexagonal Bolts

3.1 Khanyetso e Ikhethang ea Corrosion

Ho roala ka 4-8 μm Dacromet ka tloaelo ho mamella lihora tse fetang 1,000-1,200 tsa tlhahlobo ea letsoai e sa nke lehlakore (ASTM B117) ntle le mafome a khubelu-hoo e ka bang makhetlo a 7 ho isa ho a 10 ts'ebetsong ea electro-galvanizing (lihora tse 100-300). Limaraka tse sebetsang hantle haholo li ka feta lihora tse 2,000. Sebopeho sa flake se nang le mefuta e mengata se sebetsa e le tšitiso ea 'mele le anode ea sehlabelo, e fana ka tšireletso ea nako e telele libakeng tse lebōpong la leoatle, indasteri le litsela tsa letsoai.

3.2 Tokoloho ho Embrittlement ea Haedrojene

Electroplating ea setso e kenyelletsa ho khetha acid le electrolysis, e ka kenyang haedrojene ka har'a tšepe e matla haholo 'me ea baka ho robeha ha brittle ho lieha haholo-haholo-holo ho bohlokoa bakeng sa liboutu tsa 10.9 le 12.9. Ts'ebetso ea Dacromet e sebelisa feela ho hloekisa mochini le ts'ebeliso e seng ea motlakase, e felisang ka botlalo kotsi ea hydrogen embrittlement. Sena se e etsa hore e be eona e ratoang bakeng sa liboutu tsa hexagonal tse bohlokoa haholo ka polokeho.

3.3 Ho hanyetsana ha Mocheso ho Hlollang

Liaparo tsa Dacromet li lula li tsitsitse ebile li sireletsa mocheso o tsoelang pele ho fihlela ho 300 ° C. Liaparo tse tloaelehileng tsa zinki li qala ho senyeha ka holimo ho 70-100 ° C 'me li ka' na tsa ebola ho 200-300 ° C. Botsitso bona ba mocheso bo etsa hore liboutu tsa Dacromet tse hexagonal li be tse loketseng bakeng sa likarolo tsa enjene, lits'ebetso tsa ho tima le maemo a mocheso o phahameng oa indasteri.

3.4 Botsitso ba Dimensional le Khokahano ea Khoele

Lesela le tšesaane haholo, le lumellanang hantle ha le fetole boholo ba likhoele kapa bophara ba sekontiri sa metsi. Linate li bokana ka thelelo ntle le ho tlanya ho feteletseng hangata ho hlokahalang ka mor'a ho kolobisoa ho chesang. Ho roala ho boetse ho phunyeletsa likoti tse tebileng, li-recesses le libaka tse ka hare tseo electroplating e ke keng ea li sireletsa ka botšepehi. Ho phaella moo, filimi e tlama ka tieo ho substrate 'me e amohela liphahlo tse latelang tsa manyolo kapa lipente tse nang le li-adhesion tse babatsehang.

4. Mokhoa oa ho Etsa le ho Koahela

Liboutu tsa hexagonal hangata li hlahisoa ka tšepe ea k'habone e mahareng kapa ea alloy ka sehlooho se batang kapa ho forging e chesang, e lateloe ke ho roala likhoele le kalafo ea mocheso ho fihlela sehlopha sa thepa se hlokahalang (hangata 8.8, 10.9, kapa 12.9). Kamora ho hloekisoa ka botlalo, ho roala ha Dacromet ho sebelisoa ka tsela e latelang:

1.Ho lokisa holim'a metsi: Alkaline degreasing le mechanical abrasive cleaning (ha ho pickling acid).

2. Tšebeliso ea ho roala: Dip-spin qoelisoa bakeng sa li-fasteners tse ngata kapa ho fafatsa bakeng sa likarolo tse kholoanyane; ho tlotsoa ho feteletseng ho tlositsoe ke centrifugation.

3. Ho folisa: Ho baka hoo e ka bang 300-320 ° C bakeng sa metsotso e 15-30 ho theha mohaho o sireletsang oa flake.

4.Seaparo sa ka holimo sa boikhethelo: Seshibi kapa setlolo se ka sebelisoa ho matlafatsa khanyetso ea kutu le ho laola khohlano.

5. Likopo tse Tloaelehileng

Dacromet hexagonal bolts e hlalositsoe haholo moo ho ts'epahalang nako e telele tlasa maemo a senyang kapa a mocheso o phahameng ho bohlokoa:

Likoloi: Chassis, suspension, brake system, hardware compartment hardware, le likarolo tse ka tlas'a 'mele tse pepesehileng letsoai tseleng.

Phetiso ea matla a moea le matla: Li-bolts le li-fasteners tsa sebopeho lebōpong la leoatle le li-turbine tsa moea tse lebōpong la leoatle.

Marine & offshore: Mehaho ea li-deck le sethala tse pepesehileng ho fafatsa metsi a letsoai a sa khaotseng.

Kaho le meralo: Lihokelo tsa foreimi ea tšepe, likarolo tsa borokho, le manonyeletso a kantle a sebopeho.

Terene, mechini e boima, sefofane le ts'ireletso: Lintlha tsa ho tiisa tse matla haholo li ipapisitse le ho thothomela, boemo ba leholimo le khatello ea mochini.

6. Papiso le Liaparo tsa Setso

Phapang ea bohlokoa ea ts'ebetso e totobatsa hore na ke hobaneng ha Dacromet e ratoa bakeng sa liboutu tse sebetsang hantle tsa hexagonal:

Botenya ba ho roala: Dacromet 4–8 μm  |  Electro-galvanizing 5–15 μm  |  Mocheso oa ho qoela ka galvanizing 50-80 μm

Ho hanyetsa ho fafatsa letsoai (ha ho na mafome a khubelu): Dacromet ≥1,200 h  |  Electro-galvanizing 100–300 h  |  Hot-dip 500-800 h

Kotsi ea hydrogen embrittlement: Dacromet – Ha ho letho |  Electro-galvanizing – Holimo  |  Ho qoelisoa ho chesang – Ho mahareng

Ho hanyetsa mocheso o phahameng: Dacromet ho fihlela ho 300°C  |  Electro-galvanizing ≤100°C  |  Ho qoelisoa ho chesang ≤200°C

Khoele e lekana: Dacromet e boloka mamello e nepahetseng; hot-dip galvanizing hangata e hloka matšeliso a khoele.

7. Maemo, Kereiti, le Litlhaloso

Dacromet hexagonal bolts e etsoa ho latela maemo a machaba ho kenyeletsa ISO 4014/4017, DIN 931/933, ANSI/ASME B18.2.1, le GB/T 5782/5783. Lihlopha tse tloaelehileng tsa thepa ke 4.8, 8.8, 10.9, le 12.9 (metric) kapa Kereiti ea 5 le Kereiti ea 8 (inch). Lisebelisoa li kenyelletsa tšepe ea carbon le alloy steels tse kang 35CrMo, 40Cr, le 42CrMo. Mefuta e tloaelehileng ea boholo ba M5 ho M36 (boholo bo boholo bo fumaneha bakeng sa lisebelisoa tse khethehileng), ka litlhophiso tse feletseng kapa tse sa fellang. Li-OEM tse ngata tsa likoloi li thathamisa Dacromet kapa li-zinc-flake tse lekanang le tsona e le liphetho tse lumelletsoeng bakeng sa li-fasteners tse matla haholo.

8. Litlhokomelo tsa Tikoloho

Meetso ea setso ea Dacromet e na le chromium e hexavalent ka har'a setlamo. Le hoja seaparo se phekotsoeng se tsitsitse 'me mokhoa ona o hlahisa metsi a litšila a fokolang haholo ho feta electroplating, melao ea tikoloho e tsamaisitse nts'etsopele ea mefuta e meng e se nang chromium e kang Geomet® le lisebelisoa tse ling tsa sejoale-joale tsa zinc-flake. Tsena li boloka melemo ea mantlha ea ts'ebetso ea Dacromet ha li ntse li kopana le litlhoko tse thata tsa RoHS le REACH.

Ka kakaretso, ts'ebetso ea Dacromet e nkoa e le ea botsoalle ho feta e tloaelehileng ea electro-galvanizing hobane e felisa libaka tsa ho hlapa tse nang le acid, litharollo tsa cyanide, le phekolo e pharaletseng ea metsi a litšila. Khemistri e thehiloeng metsing e boetse e fella ka tlhahiso e tlase ea "volatile organic compound" (VOC).

9. Qetello

Dacromet hexagonal bolts e fana ka tharollo ea ts'ebetso e phahameng bakeng sa lits'ebetso tse hlokang ho ts'epahala ha mochini le ts'ireletso ea nako e telele ea kutu. Motsoako oa bona oa lesela le tšesaane haholo empa le sebetsa haholo, ho lokoloha ka botlalo ho tsoa ho hydrogen embrittlement, ho hanyetsa mocheso o matla, le taolo e nepahetseng ea likarolo li etsa hore e be tsa bohlokoa haholo bakeng sa li-fasteners tse matla haholo makaleng a makoloi, a matla, a leoatleng le a boenjiniere ba meralo.

Ha melao ea tikoloho e ntse e fetoha, liphahlo tsa zinc-flake tse se nang chromium tse nkiloeng ho thekenoloji ea pele ea Dacromet li ntse li tsoela pele ho atolosa mefuta e mengata ea likhetho tse lumellanang. Ebang li hlalositsoe e le Dacromet ea khale kapa e tšoanang le ea sejoale-joale, liboutu tsena tse koahetsoeng ka mahlakore a mabeli li fana ka nako e tšoarellang e lelefatsang bophelo ba ts'ebeletso haholo le ho fokotsa litšenyehelo tsa tlhokomelo libakeng tse senyang le tse phahameng haholo. Bakeng sa manonyeletso a bohlokoa moo ho hloleha e seng khetho, liboutu tsa Dacromet tse hexagonal e lula e le e 'ngoe ea litharollo tse tšepahalang ka ho fetesisa tse tsoetseng pele tse fumanehang kajeno.