Maboti a Flange opangidwa ndi Dacromet 

2. Kumvetsetsa Dacromet Coating Technology

Dacromet ndi madzi, osagwiritsa ntchito electrolytic zinc-aluminium flake coating system yopangidwira makamaka zomangira, kuphatikiza ma bolt amphamvu kwambiri. Mosiyana ndi njira zachikhalidwe zopangira ma electroplating zomwe zimayika ayoni zitsulo kudzera mumagetsi, njira ya Dacromet imagwiritsa ntchito slurry yopangidwa mwaluso yokhala ndi zinc flakes, aluminium flakes, ndi ma inorganic binder pamwamba pa bawuti. Mukathira pogwiritsa ntchito dip-spin kapena kupopera mbewu mankhwalawa, ma bolts okutidwa amachiritsidwa ndi kutentha kwambiri (nthawi zambiri pafupifupi 300 ° C), zomwe zimayika ma flakes kukhala filimu yoteteza yomangika, yokhala ndi zigawo zambiri.

Chophimba cha Dacromet chimakhala chochepa kwambiri - nthawi zambiri chimakhala pakati pa 6 ndi 12 micrometer - komabe chimapereka kukana kwa dzimbiri. Zinc ndi aluminiyamu zomwe zimaphatikizika zimapanga chotchinga cha labyrinthine chomwe chimachepetsa kwambiri kulowa kwa chinyezi, mpweya, ndi ma ion owononga. Panthawi imodzimodziyo, zinki imapereka chitetezo chansembe (cathodic) ku gawo lapansi lachitsulo cha bawuti, pomwe zida za aluminiyamu ndi chromate zimathandizira kukhazikika komanso kulimba kwa dzimbiri. Dongosolo lodzitchinjiriza lamakina ambiri ndi chimodzi mwazifukwa zazikulu zomwe Dacromet imaposa plating wamba wa zinki komanso ngakhale kuviika kotentha pamayeso ambiri othamanga.

Chofunika kwambiri, chifukwa njira ya Dacromet imaphatikizapo kusakaniza kwa asidi komanso kusayika kwa electrolytic, sikumalowetsa haidrojeni muzitsulo zachitsulo za bawuti. Mchitidwe wofunikirawu umapangitsa kuti Dacromet yokutira kwathunthu haidrojeni ikhale yaulere - mwayi wodziwikiratu pakuyika mabawuti olimba kwambiri a giredi 10.9, 12.9, kapena ASTM A490.

3. Ubwino waukulu wa Dacromet Flange Bolts

3.1 Kulimbana ndi Dzimbiri Kwapadera ndi Kuchita Zotsutsana ndi Dzimbiri

Maboti a Dacromet okhala ndi flange nthawi zonse amakwanitsa maola opitilira 1,000 osalowererapo kutsitsi mchere (ASTM B117 / ISO 9227) popanda kuoneka kwa dzimbiri lofiira. M'makalasi ambiri azamalonda, dzimbiri loyera limachedwanso kupitirira maola 240. Mlingo wa anti- dzimbiri uwu umaposa kwambiri zokutira wamba za electroplated zinki, zomwe nthawi zambiri zimawonetsa dzimbiri lofiira mkati mwa maola 72 mpaka 200 pansi pamiyeso yofanana. Kulimbana kwakukulu kwa dzimbiri kwa Dacromet kumachokera ku mawonekedwe ake apadera a flake ndi machitidwe a synergistic a chitetezo chotchinga, chitetezo cha zinc nsembe, komanso kuphatikizika kwa mankhwala.

M'malo adziko lapansi - m'mphepete mwa nyanja, mafakitale opanga mankhwala, magalimoto apansi panthaka, ndi nsanja zam'mphepete mwa nyanja - ma bolts a Dacromet flange amasunga kukhulupirika kwawo nthawi yayitali kuposa zomangira zomata. Chophimbacho chimalepheretsa kuti dzimbiri yunifolomu komanso kupindika komwe kumakhala komweko, kuwonetsetsa kuti bawutiyo ikupitiliza kupereka mphamvu yolimba yolimba pa moyo wake wonse. Kutha kwa dzimbiri kumeneku kumatanthawuza kuchepetsedwa kwa ndalama zokonzetsera, kutsika kocheperako kosakonzekera, komanso chitetezo chokhazikika.

3.2 Kwaulere Kwa Hydrogen Embrittlement Kwaulere

Ubwino umodzi wofunikira kwambiri wa zokutira za Dacromet pamabawuti a flange ndikuti mwachilengedwe mulibe hydrogen embrittlement. Zitsulo zachitsulo zamphamvu kwambiri zimakhala zovuta kwambiri ku hydrogen embrittlement, chodabwitsa chomwe atomiki haidrojeni imafalikira mu microstructure yachitsulo, imachepetsa ductility, ndipo ingayambitse mwadzidzidzi, kuchedwa kusweka pansi pa kupsinjika maganizo. Njira zachikhalidwe zopangira ma electroplating zimapanga haidrojeni pa cathode panthawi yoyika zitsulo, ndipo ngakhale kuphika mozama pambuyo poyatsa sikungatsimikizire kuchotsedwa kwathunthu kwa haidrojeni.

Chifukwa Dacromet ndi zokutira zopanda electrolytic zogwiritsidwa ntchito popanda pretreatment asidi, palibe haidrojeni yomwe imalowetsedwa mu bolt panthawi yomaliza. Kuchiritsa kotsatira kwa kutentha kwakukulu kumatsimikiziranso kuti chinyezi chilichonse chotsalira chimachotsedwa. Kuyesa kwakukulu kwa ziyeneretso-kuphatikiza maphunziro ochirikiza kuvomereza kwa Dacromet kwa ASTM A490 ma bolts okhazikika - kwatsimikizira kuti Dacromet yokutidwa ndi mabawuti olimba kwambiri amasungabe mphamvu zawo zonse zosweka ngakhale atakumana ndi malo owononga. Chikhalidwe chaulere cha hydrogen ichi chimapangitsa Dacromet kukhala chotchingira chosankha cholumikizira ma flange ofunikira mumagetsi opangira mphepo, milatho, zida zokakamiza, komanso kugwiritsa ntchito chassis yamagalimoto.

3.3 Wopyapyala, Wovala Wofanana Ndi Kuphimba Kwabwino Kwambiri

Mosiyana ndi galvanizing yotentha, yomwe imapangitsa kuti zinki ikhale yokhuthala komanso nthawi zina yosagwirizana, Dacromet imapanga zokutira zopyapyala, zofanana kwambiri zomwe zimatsatira geometry yeniyeni ya ulusi wa bawuti, utali wapansi pamutu, ndi nkhope ya flange. Kufanana uku kumateteza kulumikizidwa kwa ulusi wopangidwa komanso kumathandizira kulumikizana kolondola kwa torque-tension panthawi yolumikizana. Njira yogwiritsira ntchito dip-spin imawonetsetsa kuti ngakhale ma geometri ovuta, madera okhazikika, ndi malo amkati a ma flange bolt amalandira chitetezo chokwanira cha dzimbiri, kuchotsa malo ofooka omwe nthawi zambiri amalumikizidwa ndi zokutira zamagetsi.

3.4 Kukhazikika Kwambiri Kutentha ndi Kukhazikika Kwamakina

Kupaka kwa Dacromet kumakhalabe kokhazikika pakutentha kosalekeza kwautumiki mpaka 300 ° C, kupitilira malire azomwe zimagwiritsidwa ntchito popanga zinki (zomwe zimayamba kutsika mozungulira 100-120 ° C). Kukana kutentha kumeneku kumakhala kofunikira kwambiri pamaboti a flange omwe amagwiritsidwa ntchito m'zipinda zama injini, makina otulutsa mpweya, ng'anjo zamakampani, ndi zida zopangira mphamvu. Kuonjezera apo, filimu yochiritsidwa ya Dacromet imasonyeza kukana kwabwino kwa kuwonongeka kwa makina panthawi yogwiritsira ntchito ndi kuyika, kutetezeranso kuwonongeka kwa nthawi yaitali ndi anti- dzimbiri ntchito ya bolt.