Dacromet Hexagonal Bolts-Iyo Yakakwana Sumo kune Yakakwira-Kuita Corrosion-Resistant Fasteners 

2. Chii chinonzi Dacromet Coating?

Dacromet is an inorganic coating system inoumbwa ne-ultra-fine zinc flakes, aluminium poda, uye chromium-based (kana chromium-isina) binder. Inoshandiswa semvura-based dispersion uye inorapwa paanenge 300 ° C, inoumba amorphous binder iyo inopindirana inopindirana simbi flakes kuita compact inodzivirira firimu. Ukobvu hwekufukidzira hungori 4–8 μm—hutetepa zvikuru kupfuura kupisa-dip galvanizing (50–80 μm)—asi hunopa kudzivirira kwepamusoro-soro. Nzvimbo yakapedzwa ine yunifomu yesirivha-grey metallic kutaridzika.

Core composition: zinc flakes (60-80%) yekudzivirira kwechibairo, aluminium poda (5-15%) yekusimudzira zvipingamupinyi zvivakwa, inorganic binder inopfuudza pamusoro, uye yakasvibiswa mvura semutakuri wepakati.

3. Mabhenefiti Akakosha eDacromet Hexagonal Bolts

3.1 Yakasarudzika Corrosion Resistance

A 4-8 μm Dacromet coating inowanzomira kupfuura maawa 1,000-1,200 ekusarerekera munyu kupfapfaidza kuyerwa (ASTM B117) isina tsvuku ngura-inenge 7 kusvika 10 nguva yekuita kwe electro-galvanizing (100-300 maawa). Magiredhi epamusoro-soro anogona kudarika maawa e2,000. Iyo yakawanda-layered flake chimiro inoshanda sesese chipingamupinyi chemuviri uye chibayiro anode, ichipa kuchengetedzwa kwenguva refu munzvimbo dzemahombekombe, maindasitiri, uye mugwagwa-munyu.

3.2 Rusununguko kubva kuHydrogen Embrittlement

Traditional electroplating inosanganisira kunhonga asidhi uye electrolysis, izvo zvinogona kupinza haidrojeni musimbi yakasimba-yakasimba uye kukonzera kunonoke kutsemuka kutsemuka-kunyanya kunetsa kweGrade 10.9 uye 12.9 mabhaudhi. Iyo Dacromet process inoshandisa chete mechanic yekuchenesa uye isiri-electrolytic application, ichibvisa zvachose hydrogen embrittlement njodzi. Izvi zvinoita kuti ive iyo yakasarudzika jaketi yekuchengetedza-yakakosha yakakwira-tensile hexagonal mabhaudhi.

3.3 Yakanyanya Kupisa Kupokana

Dacromet coatings inoramba yakagadzikana uye inodzivirira pakudziya kunoramba kuripo kusvika ku300 ° C. Mabatirwo emazingi echinyakare anotanga kudzikira pamusoro pe70–100°C uye anogona kusvuuka pa200–300°C. Uku kugadzikana kwekupisa kunoita kuti Dacromet hexagonal mabhaudhi yakanakira injini makamuri, exhaust masisitimu, uye maindasitiri epamusoro-tembiricha nharaunda.

3.4 Dimensional Kugadzikana uye Thread Kuenderana

Iyo yakanyanya-yakatetepa, yakabatikana coating hainyanyi kushandura zviyero zveshinda kana pitch dhayamita. Nzungu dzinoungana zvakanaka pasina kuwandisa kudzvanya kazhinji kunodiwa mushure mekupisa-dip galvanizing. Iyo yekupfekedza inopindawo maburi akadzika, maburi, uye mukati memukati izvo electroplating haigone kuchengetedza zvakavimbika. Mukuwedzera, iyo firimu inosungirirana zvakasimba kune substrate uye inogamuchira inotevera organic coatings kana pendi ine yakanakisa adhesion.

4. Manufacturing and Coating Process

Hexagonal mabhaudhi anowanzo kugadzirwa kubva pakati-kabhoni kana alloy simbi neinotonhora musoro kana inopisa kuforoma, inoteverwa neshinda kukungurutswa uye kupisa kurapwa kuti uwane inodiwa pfuma kirasi (kazhinji 8.8, 10.9, kana 12.9). Mushure mekuchenesa zvakakwana, iyo Dacromet coating inoshandiswa sezvinotevera:

1.Kugadzirira kwepamusoro: Alkaline degreasing uye mechanical abrasive kuchenesa (hapana asidi pickling).

2.Coating application: Dip-spin kunyudzwa kwemafasteners akawanda kana kupfapfaidza zvikamu zvakakura; yakawandisa coating inobviswa ne centrifugation.

3.Curing: Kubika paanenge 300-320 ° C kwema 15-30 maminetsi kuti agadzire chimiro chekudzivirira flake.

4. Optional topcoat: Sealer kana mafuta ekuzora anogona kuiswa kuti awedzere kusaita ngura uye kudzora iyo coefficient yekukwesha.

5. Typical Applications

Dacromet hexagonal bolts inotsanangurwa zvakanyanya uko kuvimbika kwenguva refu pasi pekuora kana kutonhora kwakanyanya kwakakosha:

Motokari: Chassis, kumiswa, mabhureki masisitimu, injini yemidziyo yemidziyo, uye zvikamu zvepasi zvakafumurwa munyu wemugwagwa.

Mhepo simba & kutapurirana kwemagetsi: Shongwe mabhoti uye zvigadziriso zvekusimbisa pamahombekombe uye pamahombekombe emhepo turbines.

Marine & offshore: Deck hardware uye zvivakwa zvepuratifomu zvakafumurwa kune inoenderera yemvura yemunyu spray.

Kuvaka & zvivakwa: Simbi furemu yekubatanidza, zvikamu zvebhiriji, uye majoini ekunze ezvimiro.

Railway, inorema muchina, aerospace & kudzivirira: Yepamusoro-simba yekusimbisa mapoinzi pasi pekuzununguka, mamiriro ekunze, uye kushushikana kwemagetsi.

6. Kuenzanisa neTraditional Coatings

Misiyano yakakosha yekuita inosimbisa kuti sei Dacromet inofarirwa kune yakakwirira-inoshanda hexagonal mabhaudhi:

Coating ukobvu: Dacromet 4–8 μm  |  Electro-galvanizing 5–15 μm  |  Kupisa-dip galvanizing 50–80 μm

Salt spray resistance (hapana tsvuku tsvuku): Dacromet ≥1,200 h  |  Electro-galvanizing 100–300 h  |  Kupisa-dip 500-800 h

Hydrogen embrittlement njodzi: Dacromet - Hapana  |  Electro-galvanizing – High  |  Kupisa-kunyura – Pakati

High-temperature resistance: Dacromet kusvika 300°C  |  Electro-galvanizing ≤100°C  |  Kupisa-kunyura ≤200°C

Thread fit: Dacromet inochengetedza kushivirira kwakanyatso; hot-dip galvanizing kazhinji inoda muripo weshinda.

7. Zviyero, Magiredhi, uye Zvinotsanangurwa

Dacromet hexagonal bolts inogadzirwa kune dzimwe nyika zviyero zvinosanganisira ISO 4014/4017, DIN 931/933, ANSI/ASME B18.2.1, uye GB/T 5782/5783. Makirasi ezvivakwa zvakajairika 4.8, 8.8, 10.9, uye 12.9 (metric) kana Giredhi 5 uye Giredhi 8 (inch). Zvishandiso zvinosanganisira kabhoni simbi uye alloy masimbi akadai 35CrMo, 40Cr, uye 42CrMo. Yakajairika saizi renji iM5 kusvika M36 (masaizi akakura anowanikwa kune akakosha maapplication), mune yakazara-shinda kana chidimbu-tambo magadzirirwo. Mazhinji emota maOEM anonyora Dacromet kana akaenzana zinc-flake coatings seyakatenderwa kupera kune yakakwirira-simba zvisungo.

8. Mafungiro Ezvakatipoteredza

Maumbirwo echinyakare eDacromet ane hexavalent chromium mubhainda. Nepo iyo yakarapwa coating yakagadzikana uye maitiro achigadzira mvura shoma shoma pane electroplating, mitemo yezvemamiriro ekunze yakafambisa kuvandudzwa kwechromium-isina dzimwe nzira dzakadai seGeomet® uye mamwe mazuvano zinc-flake masisitimu. Izvi zvinochengeta zvakakosha zvekuita zvakanaka zveDacromet uku uchisangana neRoHS yakasimba uye REACH zvinodiwa.

Pakazere, iyo Dacromet process inoonekwa seyakanyanya kushamwaridzana pane yakajairwa electro-galvanizing nekuti inobvisa mabhati easidhi, cyanide mhinduro, uye yakawanda tsvina yemvura. Iyo mvura-yakavakirwa chemistry inokonzeresa yakaderera volatile organic compound (VOC) emissions.

9. Mhedziso

Dacromet hexagonal bolts inopa yakakwira-inoshanda mhinduro yezvikumbiro inoda kuvimbika kwemakanika uye kuchengetedzwa kwenguva refu kwekuora. Kusanganiswa kwavo kweyekupedzisira-yakatetepa asi inoshanda zvakanyanya, rusununguko rwakakwana kubva kune hydrogen embrittlement, yakanakisa kupisa kupisa, uye chaiyo dimensional kudzora kunoita kuti zvinyanye kukosha kune yakakwirira-simba zvisungo mumotokari, simba, mugungwa, uye zvimiro zveinjiniya zvikamu.

Sezvo mitemo yezvakatipoteredza ichishanduka, chromium-isina zinc-flake coatings inotorwa kubva kune yekutanga Dacromet tekinoroji inoramba ichiwedzera huwandu hwesarudzo dzinoenderana. Ingave yakatsanangurwa seyechinyakare yeDacromet kana yemazuva ano yakaenzana, aya akavharidzirwa ane hexagonal mabhaudhi anoburitsa kusimba kwakasimbiswa iyo inowedzera zvakanyanya hupenyu hwesevhisi uye inoderedza mari yekugadzirisa munzvimbo dzinoora uye dzepamusoro-tembiricha. Kune majoini akakosha uko kutadza kusiri sarudzo, Dacromet hexagonal mabhaudhi inoramba iri imwe yeakanyanya kuvimbika uye tekinoroji yekumisikidza mhinduro iripo nhasi.