Dacromet Flange Bolts-Technical Overview 

1. Nhanganyaya

Dacromet flange bolts ndeyepamusoro-simba fasteners inobatanidza kugadzirwa kwemusoro weflanged nepamusoro zinc-aluminium flake coating inozivikanwa seDacromet (inonziwo zinc-chromium coating). Iyo yakabatanidzwa flange pasi pemusoro inogovera clamping mutoro zvakanyanya zvakaenzana, inowedzera inotakura nzvimbo, inovandudza kuramba kune vibration-induced kusunungura, uye kazhinji inobvisa kudiwa kwewasher yakasiyana.

Yakagadzirwa mu1970s seyepamusoro-inoshanda imwe nzira kune yakajairwa electroplating uye cadmium coatings, Dacromet tekinoroji yave yakasarudzika kurapa pamusoro peGrade 8.8, 10.9 uye 12.9 mabhaudhi. Aya mafasteners anoshandiswa zvakanyanya mumotokari chassis uye powertrain magungano, mhepo-turbine zvimiro, zvekurima uye zvekuvaka michina, makemikari ekugadzira michina, kuisirwa mugungwa uye kunze kwesimbi masisitimu uko kwakakosha kushomeka kwekugara kwenguva refu.

Mufananidzo A. Mumiririri anomiririra Dacromet-yakavharwa hex flange mabhoti (metallic sirivha-grey kupera).

2. Chii chinonzi Dacromet Coating?

Dacromet isiri-electrolytic, mvura-based inorganic coating inosanganisira zinc flakes, aluminium flakes uye chromium compounds (kana yemazuva ano chromium-isina binders) akaparadzirwa mune imwe nyanzvi matrix. Iyo yekupfekedza inoiswa ne dip-spin, spray kana dip-drain nzira uye ipapo inorapwa ne thermally pa 300-320 °C. Munguva yekurapa dense, yakawanda-layered lamellar chimiro inoumbwa iyo panguva imwe chete inopa chipingamupinyi chekudzivirira uye chibayiro (cathodic) kudzivirira kwesimbi substrate.

Yakajairika yakaoma-firimu ukobvu kubva pa5 kusvika ku12 μm. Pasinei nekutetepa kwayo, iyo yekuputira inogara ichiendesa ≥1,000 maawa (kazhinji 1,200-2,000 maawa eakagadziridzwa masisitimu) yekudzivirira mukusarerekera munyu-spray kuyedzwa (ASTM B117 / ISO 9227) isati yaonekwa tsvuku ngura-inenge 7 kusvika 10 nguva yekushanda kweyakajairwa yemagetsi ukobvu.

3. Makomborero Anokosha

• Exceptional Corrosion Resistance: ≥1,000–1,500 h munyu pfapfaidzo chaiwo; misiyano yepamusoro-soro inodarika 2,000 h.
• Zero Hydrogen Embrittlement Ngozi: Iyo nzira haishandisi kunhonga asidhi kana electrolysis, zvichiita kuti ive yakachengeteka kune yakakwirira-simba mabhaudhi (Grade 10.9+).
• High-Temperature Kugona: Kushanda kwekudzivirira kunochengetwa kusvika pa300 ° C.
• Yakanakisa Dimensional Kudzora: Firimu yakaonda yunifomu inochengetedza shinda geometry; hapana kudiwa kwenzungu dzakakura.
• Flange Design Benefits: Kunyangwe kugoverwa kwemutoro, kuderedzwa kwepasi kudzvanywa uye kunatsiridza vibration kuramba.
• Yakanakira Environmental Profile: Mvura-yakavakirwa chemistry ine yakavharwa-loop application uye yakaderedzwa marara hova.

4. Performance Kuenzanisa neTraditional Coatings

5. Manufacturing & Coating Process

Iyo yakajairika nzira yekutevedzana inosanganisira: alkaline kuchenesa uye degreasing; mechanical descaling kana abrasive blasting (asidhi pickling inodziviswa nemaune); kushandiswa kwezinc-flake slurry ne dip-spin kana spray; kupisa kupisa pa 300-320 ° C; kushandiswa kwechisarudzo chejasi rakakodzwa kana rekudzivirira; uye kutonhora kwekupedzisira pamwe nekuongorora. Maviri anoteedzana basecoat application anowanzo shandiswa kusvika kune inodiwa ukobvu uye nhanho yekuita. Kudzora kwakakosha kunosanganisira kuchena kwepasi, slurry viscosity, spin paramita, tembiricha yechoto kufanana uye yekupedzisira yekubikira-huremu verification.

6. Typical Applications

• Motokari & Zvekufambisa: Chassis, kumiswa, injini uye mabhureki-system fasteners akaoneswa mumugwagwa munyu, humidity uye kupisa bhasikoro.
• Mhepo Simba: Shongwe nenheyo mabhoti emahombekombe uye ekumahombekombe egungwa anofanirwa kushingirira kuratidzwa kwemakore mazhinji kumhepo yesaline nekugadzirisa kushoma.
• Michina yekurima nekuvaka: Zvishandiso zvinoshanda munzvimbo dzine hunyoro, mafetireza, kuputika kwevhu uye kunze kwekunze.
• Kemikari & Maitiro Indasitiri: Flange yekubatanidza uye zvimisikidzo zvekumisikidza muzvirimwa zvinobata zvinopisa mvura kana mhepo.
• Infrastructure & Marine: Mabhiriji, shongwe dzekutumira, zvivakwa zvemahombekombe, midziyo yechiteshi uye mapuratifomu ekumahombekombe.

Mufananidzo 4. Kusimba kwekuita kwehukama hwehukuru hweDacromet hunhu.

7. Zviyero, Magiredhi & Sarudzo Yekutungamira

Dimensional mwero anowanzo kutaurwa anosanganisira DIN 6921 uye ISO 4162 (hexagon flange mabhaudhi) pamwe chete neakaenzana nyika mwero seGB/T 5787. Mechanical property makirasi anowanzo kupihwa neDacromet coating i8.8, 10.9 uye 12.9 maererano ne ISO 898-1. Kuita kwekupfekedza kunowanzo kutsanangurwa kungave nekupfeka huremu (Giredhi A ≈ 24 g/m², Giredhi B ≈ 36 g/m²) kana nenhamba shoma yemaawa ekupfapfaidza munyu. Mazhinji emota dzeOEM uye zvimiro zvakatemwa zvinonyanya kuda zinc-flake masisitimu emabhaudhi akasimba chaizvo nekuti anobvisa njodzi yehydrogen-embrittlement.

Mazano anoshanda ekusarudza:

1. Sarudza kirasi yekuita yekubatisa zvinoenderana neyakatarisirwa nharaunda corrosivity chikamu (ISO 9223 C3-C5 kana kupfuura).
2. YeGiredhi 10.9 uye pamusoro, tsanangura Dacromet kana yakaenzana zinc-flake coating pane yakajairika electroplating.
3. Kana kurongeka kwetorque kana kuita kwakawanda-kusimbisa kwakakosha, kumbira inodzorwa-kukwesha topcoat (yakajairika coefficient yefriction 0.10-0.18).
4. Bata uye isa mabhaudhi nekungwarira kudzivirira kukuvadzwa kwemuchina kune yakapfava yekuputira firimu.

8. Mhedziso

Dacromet flange bolts inopa yakanakisa chiyero chepamusoro mechani simba, yenguva refu yekudzivirira ngura, dimensional kurongeka uye kuchengetedzwa kwekushanda. Nekubvisa njodzi yehydrogen embrittlement uye kuendesa makore mazhinji ehupenyu hwesevhisi kunyangwe munzvimbo dzine hutsinye, ivo vanodzikisa mutengo wekugadzirisa uye vanowedzera kuvimbika kwechimiro munzvimbo dzese dzemotokari, kuvandudzwa-simba, maindasitiri uye zvivakwa. Yakajeka kutsanangurwa kweinodiwa giredhi remuchina, dimensional standard, coating performance class uye chero topcoat inodiwa inovimbisa kuti ma fasteners achaita sezvakarongwa muhupenyu hwavo hwesevhisi.