Kurapa Kwepamusoro kweFasteners: A Comprehensive Technical Guide
Zvinenge zvese zvinosungirirwa zvekutengesa zvinogadzirwa kubva kabhoni simbi, alloy simbi, kana simbi isina tsvina. Kunyangwe kana zvinhu zvisingadzivirirwe necorrosion zvichishandiswa, kurapwa kwepamusoro kunoramba kwakakosha mukusimudzira kusimba kwemabhaudhi nenzungu munzvimbo dzine hutsinye. Ichi chinyorwa chinoongorora machira akajairwa uye mashandisiro azvo, zvichipa mainjiniya nevagadziri vane ruzivo rwunoita rwekuita kwakaringana fastener kuita.
1. Electroplated Zinc (Zinc Plating)
Electroplated zinc ndiyo inonyanya kushandiswa coating for commercial steel fasteners nekuda kwekudhura kwayo-kushanda uye aesthetic versatility (inowanikwa mutema kana olive drab). Nekudaro, inopa zvine mwero corrosion kuramba, inowanzogara maawa makumi manomwe nemaviri mukusarerekera munyu yekupfapfaidza bvunzo. Special sealants inogona kuwedzera izvi kusvika ku200+ maawa, asi pa5-8 nguva mutengo.
Muganho wakakosha ndeye hydrogen embrittlement, iyo ine njodzi yekunetesa mabhaudhi ane simba-akakwirira (magiredhi 10.9 uye pamusoro). Kubika kwepashure kunogona kudzikisira hydrogen diffusion, asi maitiro acho haawanzo kuitwa nekuda kwekuoma kwekushanda uye mutengo. Pamusoro pezvo, zinc-plated fasteners inoratidza zvisingaenderani torque-to-preload ratios, zvichiita kuti dzisakodzere majoini akakosha. Lubricant post-kurapwa kunogona kuvandudza kuenderana asi kuwedzera mutengo.
2. Phosphating
Phosphating inopa imwe inodhura-inoshanda kune zinc plating, kunyangwe iine yakaderera corrosion resistance. Kuita kwakanyanya kunoenderana nemhando yemafuta mushure mekurapwa: mafuta akajairwa anoburitsa 10-20 maawa emunyu wekupfapfaidza kuramba, nepo mafuta ekutanga anowedzera izvi kusvika maawa 72-96 pa2-3 nguva yemutengo.
Mhando mbiri dzinotungamira kushandiswa kwemaindasitiri:
• Zinc Phosphating: Inopa lubricity yepamusoro kuitira kuti gungano rive nyore.
• Manganese Phosphating: Excels in corrosion resistance, kusapfeka, uye kugadzikana kwekushisa (107-204 ° C / 225-400 ° F).
Phosphated fasteners inofarirwa kune yakavimbika torque-to-preload consistency, ichiita kuti ive yakanakira magungano akakosha senge zvinhu zveinjini (semuenzaniso, tsvimbo dzekubatanidza, cylinder head mabhaudhi) uye zvimiro zvesimbi. Zvikuru, phosphating inodzivirira hydrogen embrittlement, ichiita iyo yakasarudzika sarudzo yemabhaudhi akasimba (giredhi 10.9+).
3. Black oxide
Black oxide, yakasanganiswa nemafuta ekuputira, isarudzo-inoshamwaridzika bhajeti yezvigadziriso zveindasitiri. Ipo ichiyevedza kana ichinge yaiswa oiri, kushomeka kwayo kwekuora-kunogara kwemaawa matatu-5 chete mumunyu wekupfapfaidza bvunzo kana oiri yadzikira. Torque kusawirirana kwakashata, asi kushandisa girizi panguva yegungano kunogona kudzikisira izvi. Kunyanya kushandiswa kwayo kuri mune zvisiri-yakakosha, zvinodhura-zvikumbiro.
4. Cadmium Plating
Cadmium plating inopa yakasarudzika corrosion kuramba, kunyanya munzvimbo dzemugungwa. Zvisinei, huturu hwayo hwepamusoro uye mari yekuchenesa mvura yemarara inoita kuti 15-20 iwedzere kudhura kudarika zinc plating. Kushandiswa kunongogumira kuzvikamu zvehunyanzvi senge offshore oiri rigs uye nendege yegungwa, uko kuita kunopembedza mutengo.
5. Chromium Plating
Chromium plating inopa kushongedza kwekushongedza, kuomarara, uye kupisa kupisa (kusvika 650 ° C / 1200 ° F). Nekudaro, kutorwa kwayo kwemaindasitiri kunogumira nekuda kwekuenzana kwemutengo nesimbi isina tsvina uye njodzi dzinoramba dziripo dzehydrogen embrittlement. Pre-plating mhangura uye nickel layers zvakakosha pakudzivirira ngura.
6.Silver & Nickel Plating
• Silver Plating: Inoshanda semafuta akasimba uye inoshingirira tembiricha yakanyanyisa (kusvika 871 ° C / 1600 ° F), ichidzivirira galling mukupisa kwakanyanya (semuenzaniso, zvimisikidzo zvemuchadenga). Zvipingamupinyi zvinodhura zvinowanzogadzirisa kushandiswa kwayo kune nuts kana mabhoti maduku.
• Nickel Plating: Inobatanidza corrosion resistance nemagetsi conductivity, yakanakira zvikamu zvakadai semabhatiri terminals.
7. Kupisa-Dip Galvanizing
Kupisa-dip galvanizing kunosanganisira kunyudza zvisungo muzinc yakanyungudutswa, ichigadzira danda gobvu, risingaite ngura (15–100 μm). Zvisinei, kusaenzana kwekuputira ukobvu kunoomesa tambo yakakodzera, inoda post-galvanizing shinda reworking kana oversized nzungu-zvose izvo kukanganisa simba. Maitiro acho ane ngozi zvakare kwezvakatipoteredza nekuda kwemarara ezinc uye kubuda. Zvikuru, haina kukodzera giredhi 10.9+ fasteners nekuda kwekupisa kwekushushikana kwenjodzi.
8. DacrometCoating
Dacromet®, inopa yunifomu yekudzivirira kuburikidza ne zinc-aluminium matrix. Ivo vanobvisa hydrogen embrittlement uye vanopa yepamusoro torque kuwirirana, zvichiita kuti ive yakakodzera kune yakakwirira-simba, yakakwirira-kuora maapplication.
9.Vamwe
Specialized coatings seMagni (MAGNI), Ruspert (RUSPERT), uye Tiodize's aluminium/Teflon mahybrids anoenderana niche zvinodiwa, achipa yakawedzera kupfeka kuramba, lubrication, kana makemikari inertness.
Surface Kurapa kweStainless Steel Fasteners
• Degreasing: Zvakakosha pakubvisa mafuta ekugadzira anokanganisa kushanda uye aesthetics.
• Passivation: Inosimudzira kusaita ngura uye kupenya kwepasi kuburikidza nekunyudza fasteners mu nitric kana citric acid mhinduro.
• Electroplating: Optional nickel kana zinc coatings inovandudza chitarisiko kana conductivity, kunyange zvazvo stainless simbi inogarwa necorrosion resistance inowanzoita kuti izvi zvisave zvakakodzera.
Mhedziso
Kusarudza iyo yakakwana yekurapa kwepamusoro kunoda kuenzanisa corrosion resistance, mashandiro emuchina, mitemo yezvakatipoteredza, uye mutengo. Kubva pane electroplated zinc yemagungano ebhajeti kusvika kune inopisa diffusion coatings yemishini-yakakosha masisitimu, nzira yega yega inogadzirisa matambudziko chaiwo. Mainjiniya anofanirwa kukoshesa kuenderana nemamiriro ekushanda-kungave kurwisa kuratidzwa kwemvura yemunyu, tembiricha yakakwira, kana mitoro ine simba-kuti ive nechokwadi chekuvimbika uye kurarama kwenguva refu.
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