Dacromet Flange Bolts-Technical Overview 

1. Selelekela

Dacromet flange bolts ke li-fasteners tse matla a phahameng tse kopanyang moqapi oa hlooho ea flanged le seaparo se tsoetseng pele sa zinc-aluminium flake se tsejoang e le Dacromet (eo hape e bitsoang zinc-chromium coating). Flange e kopantsoeng ka tlas'a hlooho e abela moroalo oa clamping ka mokhoa o ts'oanang, o eketsa sebaka sa ho jara, o ntlafatsa ho hanyetsa ho thothomela ho bakoang ke ho thothomela, 'me hangata o felisa tlhokahalo ea washer e arohaneng.

E thehiloe lilemong tsa bo-1970 e le mokhoa o mong oa ts'ebetso e phahameng ho feta liphahlo tse tloaelehileng tsa electroplating le cadmium, theknoloji ea Dacromet e fetohile phekolo e ratoang ea holim'a Grade 8.8, 10.9 le 12.9 bolts. Li-fasteners tsena li sebelisoa haholo likopanong tsa chassis ea likoloi le li-powertrain, meaho ea turbine ea moea, mechini ea temo le ea kaho, lisebelisoa tsa ts'ebetso ea lik'hemik'hale, lisebelisoa tsa maoatleng le lisebelisoa tsa tšepe tsa kantle moo ho hanyetsanang le kutu nako e telele ho leng bohlokoa.

Setšoantšo sa A. Ponahalo ea moemeli oa Dacromet-coated hex flange bolts (metallic silver-gray finish).

2. Dacromet Coating ke eng?

Dacromet ke seaparo se se nang motlakase, se thehiloeng metsing se entsoeng ka li-zinc flakes, li-flakes tsa aluminium le metsoako ea chromium (kapa li-binders tsa morao-rao tse se nang chromium) tse qhalakantsoeng ka matrix a khethehileng. Ho roala ho sebelisoa ka mekhoa ea dip-spin, spray kapa dip-drain, ebe e phekoleha ka mocheso o ka bang 300-320 ° C. Nakong ea ho phekola mohaho o teteaneng, o nang le li-lamellar tse ngata o thehoa ka nako e le 'ngoe o fana ka tšireletso ea mokoallo le tšireletso ea sehlabelo (cathodic) ea substrate ea tšepe.

Botenya bo tloaelehileng ba filimi e omileng bo tloha ho 5 ho isa ho 12 μm. Leha e le tšesaane, ho roala ka tloaelo ho fana ka lihora tse ≥1,000 (hangata lihora tse 1,200-2,000 bakeng sa lits'ebetso tse ntlafalitsoeng) tsa ts'ireletso litekong tse sa nke lehlakore tsa letsoai-spray (ASTM B117 / ISO 9227) pele ho hlaha mafome a khubelu - hoo e ka bang makhetlo a 7 ho isa ho a 10 ho feta ts'ebetso ea botenya bo tloaelehileng ba motlakase.

3. Melemo ea Bohlokoa

• E Ikhethang ho Hanela Corrosion: ≥1,000–1,500 h setlolo sa letsoai se tloaelehileng; mefuta e fapaneng ea ts'ebetso e phahameng e feta 2,000 h.
• Kotsi ea ho Ebrittlement ea Zero Hydrogen: Mokhoa ona ha o sebelise ho khetha acid kapa electrolysis, ho etsa hore e bolokehe bakeng sa liboutu tse matla haholo (Kereiti ea 10.9+).
• Bokhoni ba Mocheso o Phahameng: Ts'ebetso ea ts'ireletso e bolokiloe hoo e ka bang 300 ° C.
• Taolo e Ntle ea Dimensional: Filimi e mosesaane e ts'oanang e boloka thupa ea geometry; ha ho hlokahale linate tse kholo.
• Melemo ea Design ea Flange: Esita le kabo ea mojaro, khatello e fokotsehileng holim'a metsi le ho ntlafatsa ho hanyetsa ho sisinyeha.
• Boemo ba Tikoloho bo Ratehang: Khemistri e thehiloeng metsing e nang le ts'ebeliso e koetsoeng le melapo e fokolitsoeng ea litšila.

4. Papiso ea Ts'ebetso le Liaparo tsa Setso

5. Mokhoa oa ho Etsa & Coating

Mokhoa o tloaelehileng oa ho latellana o kenyelletsa: ho hloekisa alkaline le ho tlosa mafura; ho senyeha ha mechine kapa ho phatloha ho matla (ho qojoa ha asiti ho qojoa ka boomo); tšebeliso ea slurry ea zinc-flake ka dip-spin kapa spray; pheko ea mocheso ho 300-320 ° C; kopo ea khetho ea topcoat e tlotsitsoeng kapa e sireletsang; le tsidifatso ya ho qetela mmoho le tlhahlobo. Lisebelisoa tse peli tse latellanang tsa basecoat hangata li sebelisoa ho fihlela botenya bo hlokahalang le boemo ba ts'ebetso. Litaolo tsa bohlokoa li kenyelletsa bohloeki ba holim'a metsi, slurry viscosity, spin parameters, ho tšoana ha mocheso oa sebōpi le ho netefatsa boima ba ho qetela.

6. Likopo tse Tloaelehileng

• Likoloi le Lipalangoang: Chassis, suspension, enjene le li-brake-system fasteners tse pepesehileng letsoai tseleng, mongobo le libaesekele tse futhumetseng.
• Matla a Moea: Liboutu tsa tora le tsa motheo bakeng sa li-turbine tsa lebopong le kantle ho naha tse tlamehang ho mamella ho pepesehela maemo a leholimo a letsoai ka lilemo tse ngata ka tlhokomelo e fokolang.
• Mechini ea Temo le Kaho: Lisebelisoa tse sebetsang libakeng tse nang le mongobo, manyolo, mobu oa mobu le boemo ba leholimo bo ka ntle.
• Indasteri ea Lik'hemik'hale le Ts'ebetso: Likhokahano tsa flange le lintho tse tiisang sebopeho limeleng tse sebetsanang le maro a senyang kapa sepakapaka.
• Meralo ea motheo le tsa Metsing: Marokho, litora tsa phetiso, meaho e lebopong la leoatle, lisebelisoa tsa boema-kepe le sethala sa kantle ho naha.

Setšoantšo sa 4. Matla a amanang le ts'ebetso ea litšobotsi tse ka sehloohong tsa Dacromet.

7. Maemo, Kereiti & Tataiso ea Khetho

Litekanyetso tsa dimensional tse atisang ho boleloa li kenyelletsa DIN 6921 le ISO 4162 (hexagon flange bolts) hammoho le litekanyetso tsa naha tse lekanang le GB/T 5787. Lihlopha tsa thepa ea mechine tse atisang ho fanoa ka ho roala ha Dacromet ke 8.8, 10.9 le 12.9 ho latela ISO 898-1. Ts'ebetso ea ho koahela hangata e hlalosoa ka boima ba ho penta (Kereiti A ≈ 24 g/m², Kereiti ea B ≈ 36 g/m²) kapa ka bonyane ba lihora tsa ho fafatsa letsoai. Li-OEM tse ngata tsa likoloi le litlhaloso tsa sebopeho li khetha ka ho hlaka litsamaiso tsa zinc-flake bakeng sa liboutu tse matla haholo hobane li felisa kotsi ea hydrogen-embrittlement.

Litlhahiso tse sebetsang tsa ho khetha:

1. Khetha sehlopha sa ts'ebetso ea ho roala ho latela sehlopha se lebelletsoeng sa ho bola ha tikoloho (ISO 9223 C3-C5 kapa ho feta).
2. Bakeng sa Kereiti ea 10.9 ho ea holimo, hlakisa Dacromet kapa seaparo se lekanang sa zinc-flake ho e-na le electroplating e tloaelehileng.
3. Ha ho nepahala ha torque ea kopano kapa ts'ebetso ea ho tiisa ka bongata e le ea bohlokoa, kopa topcoat e laoloang ea khohlano (coefficient e tloaelehileng ea likhohlano 0.10–0.18).
4. Tšoara 'me u kenye liboutu ka hloko ho qoba tšenyo ea mochine ho filimi e batlang e le bonolo.

8. Qetello

Li-bolts tsa Dacromet flange li fana ka tekanyo e babatsehang ea matla a phahameng a mochine, tšireletso ea nako e telele ea ho senya, ho nepahala ha dimensional le polokeho ea ts'ebetso. Ka ho tlosa kotsi ea hydrogen embrittlement le ho fana ka bophelo ba tšebeletso ea lilemo tse ngata esita le libakeng tse mabifi, ba fokotsa litšenyehelo tsa tlhokomelo le ho eketsa ts'epo ea sebopeho ho pholletsa le likoloi, matla a tsosolositsoeng, indasteri le mehaho ea motheo. Litlhaloso tse hlakileng tsa kereiti e hlokahalang ea mochini, maemo a sebopeho, sehlopha sa ts'ebetso ea ho roala le litlhoko life kapa life tsa topcoat li netefatsa hore li-fasteners li tla sebetsa joalo ka ha li reriloe bophelo bohle ba bona ba ts'ebeletso.