DACROMET LIKOLO

2026-11-07

1. Selelekela

Boenjiniere ba sejoale-joale, manonyeletso a bolt a tlameha ho hanela meroalo ea mochini le ho bola ha tikoloho. Mokhoa o tloaelehileng oa ho etsa motlakase oa motlakase le oa ho phunya o chesang o fana ka tšireletso e khahlanong le mafome empa o hlokofatsoa ke hydrogen embrittlement ka liboutu tse matla a phahameng le ho kena-kenana le li-dimensional holim'a likhoele tse nepahetseng. Ho roala ha Dacromet, tsamaiso ea zinc-aluminium flake e entsoeng lilemong tsa bo-1970, e hlōla mefokolo ena. E fana ka khanyetso e ikhethang ea kutu, e felisa kotsi ea ho emisoa ha hydrogen, e boloka boholo ba likhoele, 'me e fana ka botsitso ba mocheso o phahameng ho fihlela ho 300 ° C. Li-bolts tsa Dacromet li se li hlalositsoe haholo indastering ea likoloi, kaho, matla a moea, literene le liindasteri tsa leoatle.

2. Dacromet Coating ke eng?

Dacromet ke sekoaelo sa zinc-flake se se nang motlakase, se thehiloeng metsing se nang le zinki tse nyane tse nyane le li-flakes tsa aluminium ka har'a binder ea inorganic. Ka mor'a kopo le ho folisa, li-flakes tse pota-potileng li theha mokoallo o teteaneng oa mekhahlelo e mengata e fanang ka tšireletso ea mokoallo le tšireletso ea cathodic ea sehlabelo ho substrate ea tšepe.

Litšobotsi tsa bohlokoa:

Botenya ba filimi: hangata ke 5–12 μm (e tšesaane haholo ho feta galvanizing ea hot-dip)
Ponahalo: yunifomu ea silevera-gray metallic finish
Ha ho kotsi ea hydrogen embrittlement (ha ho na acid pickling kapa electrolysis)
Khanyetso ea kutu: hangata> lihora tse 1,000 tsa letsoai ho mafome a khubelu (ASTM B117)
Ho hanyetsa mocheso o phahameng ho fihlela ho 300 °C ts'ebeletso e tsoelang pele

Ho roala ho sebelisoa ke dip-spin (e tloaelehileng bakeng sa li-fasteners tse ngata), spray, kapa dip-drain, ebe e phekoloa ka mocheso ho ~ 300 ° C. Li-topcoat tseo u ka li khethang li eketsa ho hanyetsa kutu le ho laola khohlano bakeng sa ts'ebetso e tsitsitseng ea torque-tension.

3. Overview Coating Process

Mokhoa o tloaelehileng oa liboutu o na le mekhahlelo e mene e meholo:

1. Tokiso ea Sefahleho: Ho hloekisoa ha alkaline ho lateloe ke ho hloekisa ka mochini ha ho hlokahala. Ho qojoa ha asiti ho qoba ho monya haedrojene.

2. Kopo ea ho Koala: Likarolo li kenngoa ka har'a metsi a zinki-aluminium flake slurry (dip-spin bakeng sa liboutu tse nyane) kapa a fafalitsoe; ho feteletseng ho tlosoa ka centrifugation bakeng sa botenya bo tšoanang.

3. Ho folisa: Ho baka ka mocheso o ka bang 300–320 °C ho fetola sekopanyi le ho kopanya li-flakes tsa tšepe hore e be seaparo se tlamahaneng ka thata sa inorganic.

4.Topcoat ea boikhethelo / Sealer: Sehlahisoa se tšesaane se ntlafatsa matla, ho hanyetsa lik'hemik'hale, hape se eketsa ts'ebetso ea ho fafatsa letsoai.

Hobane ts'ebetso ena ha e na electrolytic ebile ha e na pickling ea asiti, liboutu tse matla haholo (Kereiti ea 8.8, 10.9, 12.9 le ASTM A490) li ka koaheloa ntle le kotsi ea ka hare ea hydrogen embrittlement-e leng molemo oa bohlokoa oa polokeho ho feta electroplating ea setso.

4. Melemo ea Bohlokoa ea Dacromet Bolts

4.1 Ts'ebetso e Phahameng ea Corrosion & Anti-Rust

Filimi e tšesaane ea Dacromet (6-10 μm) ka tloaelo e mamella lihora tse 1,000-2,000 tsa tlhahlobo ea setlolo ea letsoai e sa nke lehlakore pele ho hlaha mafome a khubelu-makhetlo a 7-10 ho feta a tloaelehileng a electro-galvanizing. Sebopeho sa li-multi-layer flake se fana ka tšireletso ea mokoallo ha li-zinc flakes li fana ka tšireletso ea cathodic ea sehlabelo. Chromate passivation e boetse e liehisa kutu 'me e fana ka pholiso e lekanyelitsoeng ho mengoapo e menyenyane.

4.2 Ha ho na Hydrogen Embrittlement

Liboutu tse matla a phahameng li ka hlaseloa habonolo ke hydrogen embrittlement ho tloha ho pickling ea acid le electroplating, e ka bakang ho lieha ho robeha ha brittle. Dacromet e felisa kotsi ena ka ho feletseng. Ka hona, e ratoa bakeng sa li-fasteners tse matla tse phahameng ka har'a enjine ea likoloi, chassis, tšepe ea sebopeho, le likopano tse amanang le polokeho.

4.3 Ho nepahala ha Dimensional & Thread Fit

Ka botenya ba ho roala ba 5-12 μm feela, Dacromet ha e fetole haholo geometry ea khoele. Linate tse tloaelehileng li ka sebelisoa ntle le ho tlanya ho feta tekano. Ka lehlakoreng le leng, hot-dip galvanizing (40-80 μm) hangata ho hloka linate tse khethehileng. Seaparo sena se tšesaane sa conformal se loketse liboutu tse nepahetseng le li-fasteners tse bopehileng hantle.

4.4 Khanyetso e Phahameng ea Mocheso le Khohlano e Laolehileng

Dacromet e lula e tsitsitse ho fihlela ho 300 ° C ts'ebeletso e tsoelang pele, e ka holimo ho meeli ea electroplating (~ 120 ° C) kapa hot-dip galvanizing (~ 200 ° C). Ka li-topcoats tse loketseng coefficient ea khohlano e ka laoloa (hangata μ = 0.10–0.18), ho netefatsa mojaro o tsitsitseng oa clamp le boitšoaro bo tšepahalang ba ho tiisa ka bongata.

5. Papiso ea Ts'ebetso

Tafole e ka tlase e akaretsa liphapang tsa bohlokoa lipakeng tsa Dacromet le kalafo e tloaelehileng ea setso bakeng sa liboutu:

Metric ea Ts'ebetso	Dacromet	Electro-Galvanizing	Hot-Dip Galvanizing
Botenya bo Tloaelehileng	5–12 μm	5–15 μm	40–80+ μm
Salt Spray (ho mafome a khubelu)	1,000–2,000+ h	100–300 h	500–1,000 h
H₂ Kotsi ea Embrittlement	Ha ho letho	E phahameng (e hloka ho baka)	Mahareng
Max Continuous Temp.	≈ 300 °C	≈ 100–120 °C	≈ 200 °C
Tšitiso ea Khoele	Nyenyane / Ha ho letho	Tlase	Bohlokoa
Liboutu tse Matla a Phahameng	E ntle haholo (8.8–12.9)	Monyetla / Kotsi	Moedi
Ponahalo	Uniform silver-gray	Zinc e khanyang kapa e putsoa	E mahlahahlaha, e boputsoa bo lerootho

Letlapa la 1: Ts'ebetso e bapisoang ea liphekolo tse tloaelehileng tsa bolt

Dacromet e fana ka motsoako o ikhethang oa filimi e tšesaane, khanyetso e feteletseng ea kutu, kotsi ea zero hydrogen embrittlement, le bokhoni ba mocheso o phahameng-ho etsa hore e khethehe bakeng sa likopo tse ngata tse hlokang ho itima lijo.

6. Likopo tse Tloaelehileng

Liboutu tse koahetsoeng ka Dacromet li sebelisoa haholo moo ts'ireletso ea kutu, tšireletseho le ho nepahala ha boholo li bohlokoa:

Likoloi le Lipalangoang: Enjene, chassis, suspension and body fasteners (haholo-holo Kereiti ea 10.9/12.9).
Matla a Moea le Matla: Tora, nacelle le liboutu tsa motheo libakeng tse lebopong la leoatle kapa tsa indasteri.
Terene le Mahlale a motheo: Latela li-fasteners, marokho le likhokahano tsa meralo tse hlokang bophelo bo bolelele ba ts'ebeletso.
Kaho le Mehaho ea Litšepe: Liboutu tse nang le matla a phahameng moo ho belisoa ho sa rateheng.
Marine & Offshore: Likarolo tse pepeselitsoeng ho fafatsa letsoai le mongobo o phahameng (hangata li na le li-topcoat tse ntlafalitsoeng).
Thepa ea Temo le Boima: Mechini e sebetsang mobung o senyang kapa libakeng tse kantle.

7. Maemo a Amanang le Tataiso ea Khetho

Dacromet le liaparo tse tšoanang tsa zinc-flake li koahetsoe ke litekanyetso tsa machaba tse kenyeletsang ISO 10683 (Fasteners - non-electrolytically applied zinc flake coatings), EN 13858, ASTM F1136 / F1136M, le mekhoa ea ho fafatsa letsoai ASTM B117 / ISO 9227. Litlhoko tse ngata tse khethehileng tsa likoloi li boetse li boloka li-OEMic tse khethehileng tsa likoloi.

Ha u hlakisa liboutu tsa Dacromet, baenjiniere ba lokela ho nahana ka:

Sehlopha sa Matla: E loketse bakeng sa 8.8 le ho feta; hangata e tlama bakeng sa likarolo tsa bohlokoa tsa polokeho ea 10.9 / 12.9.
Sehlopha sa Corrosion: Khetha boima ba ho roala, palo ea lijase le topcoat ho latela ts'ebetso e hlokahalang ea letsoai-spray kapa cyclic test.
Friction Coefficient: Hlalosa topcoat e laoloang ea lubricity haeba mojaro o tsitsitseng oa clamp o le bohlokoa.
Tikoloho: E ntle bakeng sa libaka tsa indasteri, tsa likoloi le tse ngata tsa kantle; lekola litsamaiso tse tenya bakeng sa ho pepeseha ho feteletseng ka metsing.
Litšenyehelo khahlano le Life-Cycle: Litsenyehelo tse phahameng ho feta tsa motheo tsa zinki hangata li fokotsoa ke bophelo bo bolelele ba ts'ebeletso le tlhokomelo e tlase.

8. Qetello

Li-bolts tsa Dacromet li emela tharollo e hōlileng ka ho fetisisa, e phahameng ea ts'ebetso bakeng sa tšireletso ea kutu ea li-fasteners. Thepa e tšesaane ea zinc-aluminium flake e fana ka khanyetso ea spray-spray ho feta e tloaelehileng ea electro-galvanizing, e felisa kotsi ea hydrogen embrittlement e sokelang liboutu tse matla, e boloka litekanyo tse nepahetseng tsa likhoele, 'me e mamella mocheso o phahameng ho fihlela ho 300 ° C.

Bakeng sa baenjiniere le bareki ba batlang ts'ebetso e ka tšeptjoang ea ho thibela mafome le ho thibela ho bola ha likoloi, libopeho, matla le lisebelisoa tsa indasteri, liboutu tse koahetsoeng ke Dacromet li fana ka tekanyo e tiisitsoeng ea ho tšoarella, polokeho le botšepehi ba mahlakore. Ha ho hlalositsoe ka nepo-ho bapisa boemo ba ho roala, topcoat le thepa ea likhohlano tikolohong ea ts'ebeletso-li kenya letsoho bophelong bo bolelele ba likarolo, tlhokomelo e fokotsehileng le ts'epo e ntlafalitsoeng ea sistimi ka kakaretso. Ha litlhoko tsa matla a phahameng, li-fasteners tse tšoarellang nako e telele li ntse li hōla, liaparo tsa zinc-flake tse kang Dacromet e ntse e le lejoe la sekhutlo la boenjiniere ba morao-rao ba sejoale-joale.

E fetileng E latelang.

Litaba tsa morao-rao