DACROMET HEX NUTS-Kenyelletso e Felletseng ea Li-Fasteners tse hanyetsanang le Corrosion 

1. Selelekela

Linate tsa hexagonal, tse tsejoang ka hore ke hex nuts, ke tse ling tsa li-fasteners tse sebelisoang haholo ho boenjineri ba mochini, kaho, likoloi le lits'ebetso tsa indasteri. Ha li kopantsoe le mekhoa ea phekolo e tsoetseng pele e kang ho roala ha Dacromet, likarolo tsena li finyella khanyetso e ikhethang ea kutu, e leng se etsang hore e tšoanelehe bakeng sa libaka tse thata tse kenyeletsang leoatleng, likoloi tse ka tlas'a lefatše, le mekhoa ea ka ntle ea meralo.

Sengoliloeng sena se fana ka kenyelletso ea maikutlo a mabeli: pele ho hlahloba moralo oa mantlha le litekanyetso tsa linate tsa hex, 'me ea bobeli ho hlahloba theknoloji ea ho roala ea Dacromet (zinc-aluminium flake) e ntlafatsang haholo ho tšoarella le ts'ebetso ea bona.

1.1 Hex Nuts ke Eng?

Hex nut ke mofuta oa fastening o nang le lesoba le khoele le sebopeho sa ka ntle sa hexagonal. Geometry e nang le mahlakoreng a tšeletseng e lumella ho sebelisoa ha torque ka mokhoa o nepahetseng ho sebelisa li-wrenches kapa li-sockets tse tloaelehileng, ho fana ka phihlelo e ntle libakeng tse koaletsoeng ha u ntse u hanela ho pota-pota tlas'a meroalo e phahameng. Hex nuts e batla e sebelisoa hangata mmoho le boutu ea mating kapa stud ho kopanya likarolo tse peli kapa ho feta hammoho.

Litšobotsi tsa bohlokoa li kenyelletsa:

• Khoele e ka hare (metric kapa imperial) e ts'oanang le bolt
• Bophara ho pholletsa le lifolete (boholo ba wrench) le botenya bo hlalosoang ke maemo
• E fumaneha ka limaraka tse fapaneng tsa matla (mohlala, Sehlopha sa 8, 10, Kereiti ea 5, 8)
• Lisebelisoa tse tloaelehileng: tšepe ea carbon, tšepe ea alloy, tšepe e sa hloekang

1.2 Karolo ea Seaparo sa Dacromet

Dacromet ke proprietary zinc-aluminium flake coating system (e qapiloeng ke Metal Coatings International) e sebelisoang e le filimi e tšesaane, e seng ea motlakase. E fana ka tšireletso e phahameng ea kutu ha e bapisoa le electroplating e tloaelehileng ea zinc kapa hot-dip galvanizing, haholo-holo bakeng sa li-fasteners tse matla haholo moo ho tlameha ho qojoa ho kenngoa ha haedrojene. Ho roala ka tloaelo ho bonahala ka tšepe ea silevera-grey 'me e lekanya feela 5-12 μm ka botenya, e boloka khoele e lekana le ho nepahala ha sebopeho.

2. Hex Nuts: Moralo, Maemo & Litekanyo

2.1 Mefuta ea Hex Nuts

Ho na le mefuta e mengata e fapaneng ea ho sebetsana le litlhoko tse fapaneng tsa ts'ebetso:

• Standard (E felile) Hex Nut - Kakaretso-morero, foromo e tloaelehileng haholo (ISO 4032 / DIN 934 / ASME B18.2.2).
• Heavy Hex Nut - Bophara bo boholo ho feta lifolete le botenya bo boholo bakeng sa lits'ebetso tsa meralo (mohlala, ASTM A563).
• Jam (Thin) Nut - Botenya bo fokotsehileng bakeng sa ho notlela kapa tšebeliso ea sebaka.
• Nylon-Insert Lock Nut (Nylock) - Ntho e ntseng e tsoela pele ea ho notlela torque.
• Flange Nut - Sefahleho se kopantsoeng sa washer bakeng sa phepelo e ntlafalitsoeng ea mojaro.

2.2 Metric Hex Nut Dimensions (ISO 4032 / DIN 934)

Tafole e latelang e akaretsa litekanyo tsa bohlokoa bakeng sa saese e tloaelehileng ea metric ea linate tse tloaelehileng tsa hex:

Letlapa la 1: Litekanyo tse khethiloeng tsa metric hex nut (litekanyetso tse hakanyetsoang li thehiloe ho ISO 4032 / DIN 934).

2.3 Matla Kereiti & Thepa

Hex nuts li hlophisoa ho latela maemo a thepa ea mochini. Lihlopha tse tloaelehileng tsa metric li kenyelletsa Sehlopha sa 6, sa 8, le sa 10 (ISO 898-2). Lihlopha tse phahameng li lumellana le mojaro o phahameng oa bopaki le boima. Bakeng sa ts'ebeliso ea meralo, ho khethoa linate tse boima tsa hex tse lumellanang le litekanyetso tsa ASTM A563 kapa EN. Tšepe ea carbon ke thepa ea motheo e tloaelehileng ka ho fetisisa; tšepe e sa hloekang (A2 / A4) e sebelisoa ha ho hlokahala khanyetso ea tlhaho ea kutu, le hoja Dacromet-coated carbon steel hangata e fana ka mokhoa o mong o sebetsang ka mokhoa o phahameng oa ts'ebetso e phahameng.

3. Dacromet Coating Technology

3.1 Sebopeho le Sebopeho

Dacromet ke lesela le thehiloeng metsing, le se nang electrolytic le entsoeng haholo-holo ka zinki le li-flakes tsa aluminium tse qhalakantsoeng ka har'a sekontiri sa chromium-oxide binder. Filimi e hlahisoang e tšesaane (hangata 5-12 μm), silevera ea tšepe ka ponahalo, 'me e fana ka tšireletso ea mekhahlelo e mengata:

• Tšireletso ea lithibelo - Likarolo tsa Flake li arola substrate ho tsoa ho media e senyang.
• Tšireletso ea Galvanic (sehlabelo) - Zinc e sebetsa e le anode, ka ho khetheha e senya.
• Passivation - Metal oxides e liehisa karabelo ea kutu.
• Ho itokisa - Zinc oxides le carbonates li fallela libakeng tse senyehileng.

3.2 Ts'ebetso ea kopo

Tatelano e tloaelehileng ea ts'ebetso e qoba ho khetha asiti, ka hona e felisa kotsi ea hydrogen embrittlement:

1. Ho lokisoa ha bokaholimo: Ho tlosoa ha alkaline + ho theoha ha mochini (ho phatloha ho hoholo).
2. Tšebeliso ea ho roala: Dip-spin (e tloaelehileng haholo bakeng sa li-fasteners), spray, kapa dip-drain.
3. Ho omisa / ho omisa pele mochesong o leka-lekaneng ho tlosa metsi.
4. Pheko e futhumatsang hoo e ka bang 280–320 °C ho theha matrix a inorganic.

3.3 Ts'ebetso ea Corrosion

Ts'ebetso e atisa ho hlahlojoa ka tlhahlobo e sa nkeng lehlakore ea ho fafatsa letsoai (ISO 9227 / ASTM B117). Liphetho tse tloaelehileng tsa sistimi ea Dacromet 320/500 li bonts'itsoe ka tlase:

Letlapa la 2: Ts'ebetso e tloaelehileng ea kutu ea liaparo tsa Dacromet (liphello li itšetlehile ka substrate, geometry le ts'ebetso).

Melemo e meng e kenyelletsa ho hanyetsa mocheso hoo e ka bang 300 ° C, ho penta hantle, coefficient e laoloang ea khohlano (haholo-holo ka topcoat e tlositsoeng joalo ka PLUS kapa DACROLUB), le ho lumellana le aluminium (kotsi e fokotsehileng ea ho bola ha galvanic).

4. Likopo, Papiso & Qetello

4.1 Likopo tse Tloaelehileng tsa Dacromet Hex Nuts

Ka lebaka la motsoako oa tsona oa matla a phahameng, jiometry e nepahetseng, le ho hanyetsa ha kutu ntle le kotsi ea hydrogen-embrittlement, linate tsa hex tse koahetsoeng ke Dacromet li hlalositsoe haholo ho:

• Likoloi: chassis, underbody, enjene le li-fasteners tsa phetisetso (hangata Kereiti ea 10.9 / Sehlopha sa 10).
• Lisebelisoa tsa leoatleng le lebopong la leoatle: litereilara, li-winch, lisebelisoa tsa meralo.
• Kaho le meralo ea motheo: meaho ea tšepe ea kantle, marokho, lithako.
• Matla a moya le metjhini e boima: manonyeletso a matla a phahameng a pepesehetseng boemo ba lehodimo.
• Lisebelisoa tsa terene le tsa temo tse hlokang bophelo bo bolelele ba ts'ebeletso libakeng tse senyang.

4.2 Papiso le Mela e Meng

Letlapa la 3: Kakaretso ea papiso ea li-fasteners tse tloaelehileng.

4.3 Qetello

Dacromet hex nuts e emela tharollo e holileng, e sebetsang hantle haholo e kopanyang ts'epahalo ea mochini oa li-fasteners tse tloaelehileng tsa hexagonal tse nang le ts'ireletso e tsoetseng pele ea zinc-aluminium flake corrosion. Moaparo oa bona o mosesaane, o ts'oanang o boloka li-geometry tse nepahetseng 'me o felisa matšoenyeho a hydrogen-embrittlement a amanang le mekhoa ea electrolytic, e leng se etsang hore e tšoanelehe ka ho khetheha bakeng sa limaraka tse phahameng tse sebelisoang ts'ebetsong ea ts'ireletso kapa ea nako e telele ea ka ntle.

Ha ba khetha li-fasteners, lienjineri li lokela ho nahana ka tikoloho e itseng ea kutu, mocheso o hlokahalang oa ts'ebeletso, litlhoko tsa torque / khohlano, le litefiso tsa theko. Mererong e mengata ea likoloi, tsa metsing le tsa meaho, linate tsa hex tse koahetsoeng ka Dacromet li fana ka tekanyo e ntle ea ts'ebetso, ts'epo, le boleng ba bophelo bohle.

Ha melaoana ea tikoloho e ntse e tsoela pele ho rata mefuta e meng e fokolitsoeng ea chromium kapa e se nang chromium (mohlala, litsamaiso tsa Geomet®), lelapa le pharaletseng la li-zinc-flake e ntse e le theknoloji e ratoang bakeng sa tharollo ea sejoale-joale e thibelang kutu.