Raws li cov khoom tseem ceeb hauv kev sib txuas thiab kho cov rooj sib txoos, kev kho deg ntawmboltstsis tsuas yog cuam tshuam rau lawv cov tsos, tab sis kuj tseem ua lub luag haujlwm tseem ceeb hauv lawv lub neej kev pabcuam thiab kev ua haujlwm tag nrho. Kev siv cov txheej txheem kho kom zoo tuaj yeem txhim kho bolts 'kev tiv thaiv corrosion, hnav tsis kam, thiab qaug zog lub zog, yog li txuas lawv lub neej kev pab cuam thiab ua kom ruaj khov thiab txhim khu kev lag luam ntawm cov khoom siv. Tom ntej no, peb yuav tshawb xyuas ntau txoj kev kho saum npoo av rau bolts, txheeb xyuas lawv qhov sib txawv, thiab txheeb xyuas cov txheej txheem twg muaj qhov zoo tshaj plaws tiv thaiv xeb.
1. Galvanizing
1.1 Kev Taw Qhia
Galvanizing yog ib qho kev kho deg feem ntau siv rau bolts. Nws lub hauv paus ntsiab lus yog tsim cov zinc tiv thaiv txheej rau ntawm qhov ntsia liaj qhov rooj los txhim kho corrosion kuj thiab zoo li. Galvanizing feem ntau muab faib ua ob pawg: kub-dip galvanizing thiab txias galvanizing (electrogalvanizing).
Kub-dip galvanizing: Bolts yog immersed nyob rau hauv zinc molten, tsim ib tug tuab zinc txheej (feem ntau 10-}60 microns) nrog ib tug uniformly ntxhib nto. Nws muaj zog tiv thaiv kev ua tau zoo thiab tsim nyog rau sab nraum zoov, cov av noo ib puag ncig thiab lub sijhawm xav tau kev pab lub neej ntev.
Electrogalvanizing: Ib txheej zinc nyias (feem ntau 5-15 microns) yog tso rau ntawm lub ntsia liaj qhov rooj los ntawm electrolysis. Nws nta tus nqi qis thiab cov tsos zoo, ua rau nws tsim nyog rau sab hauv tsev qhuav qhov chaw thiab kev tiv thaiv lub teeb pom kev zoo nrog cov kev xav tau corrosion tsawg.
1.2 Kev txwv kev siv
Hydrogen embrittlement yuav tshwm sim yog tias kev kho hydrogen nyem tsis tiav thaum lub sij hawm electrogalvanizing. Cov me me - qhov loj me (M2.5 thiab qis dua) muaj kev pheej hmoo siab dua ntawm pob txha. Electrogalvanized bolts yam tsis muaj hydrogen nyem zoo tuaj yeem ua tsis tau raws li cov qauv ntawm Qib 10.9 thiab siab dua, yog li lawv yuav tsum tau siv ceev faj nyob rau hauv siab - lub zog sib txuas scenarios.
1.3 Txheej txheem
Cov txheej txheem tshwj xeeb ntws yog: Degreasing - Ntxuav - Tsis muaj zog acid ua kom - Electrogalvanizing - Ntxuav - Passivation - Ntxuav - Qhuav.
1.4 Corrosion Resistance
Electrogalvanized bolts muaj nyob rau hauv cov xim xws li dawb zinc, xiav -zinc dawb, xim zinc, thiab dub zinc. Cov xim sib txawv tshwm sim los ntawm cov txheej txheem passivation sib txawv tom qab galvanizing; sib txawv passivation daws teeb meem passivation films ntawm txawv xim. Cov qib corrosion kuj yog: Dub zinc> Xim zinc> Xiav - dawb zinc> Dawb zinc.
2. Nickel plating
2.1 Kev Taw Qhia
Nickel plating yog txheej txheem uas tso cov nickel txheej ntawm cov hlau nto los ntawm cov thev naus laus zis tshwj xeeb los txhim kho bolts kev ua tau zoo, suav nrog kev tiv thaiv corrosion, hardness, thiab tsos. Nws tau muab faib ua ob pawg: electrolytic nickel plating thiab electroless npib tsib xee plating.
Electrolytic npib tsib xee plating: Nickel ions tau muab tso rau ntawm lub ntsia liaj qhov rooj los tsim ib txheej npib tsib xee los ntawm kev ua haujlwm ntawm electrochemical.
Electroless npib tsib xee plating (tseem hu ua autocatalytic npib tsib xee plating): Nyob rau hauv tej yam kev mob, npib tsib xee ions nyob rau hauv lub aqueous tov yog txo los ntawm ib tug txo tus neeg saib xyuas thiab tso rau ntawm lub ntsia liaj qhov rooj nto los ua ib tug txheej.
2.2 Txheej yam ntxwv
Electroless npib tsib xee plating: Nws muaj cov txheej txheem tuab tuab zoo sib xws, zam qhov sib txawv ntawm qhov sib txawv ntawm electrolytic nickel plating tshwm sim los ntawm qhov tsis sib xws tam sim no. Nws yog qhov tsim nyog rau kev kho cov bolts nrog cov duab sib sib zog nqus, qhov tob tob, lossis qhov yuav tsum tau ua.
Electrolytic nickel plating: Nws muaj cov qauv zoo crystalline thiab kev ua haujlwm zoo polishing. Tom qab polishing, nws tuaj yeem nthuav qhia daim iav- zoo li luster, ua rau nws siv ntau zaus hauv cov xwm txheej uas xav tau kev zoo nkauj zoo nkauj.
2.3 Cov yam ntxwv ntawm ib puag ncig thiab tus nqi
Electroless npib tsib xee plating: Nws siv cov tshuaj tshwj xeeb additives, ua tsis muaj teeb meem tshuaj lom neeg thiab muab cov phooj ywg zoo ib puag ncig. Txawm li cas los xij, tus nqi saib xyuas ntawm cov tshuaj plating yog qhov siab, ua rau nws tsim nyog rau me me -batch ntau lawm lossis workpieces nrog cov qauv nyuaj.
Electrolytic npib tsib xee plating: Nws muaj cov cuab yeej yooj yim teeb tsa, cov txheej txheem paub tab, thiab kev ua haujlwm siab, tsim nyog rau kev ua haujlwm loj. Txawm li cas los xij, cov txheej txheem electroplating tsim cov dej khib nyiab uas muaj cov hlau hnyav, yuav tsum tau txhawb nqa cov khoom siv kho ib puag ncig.
3. Kev Kho Mob Dub Oxide
Kev kho mob oxide dub (tseem hu ua bluing lossis oxidation kho) yog siv dav vim nws cov nqi qis thiab kev ua haujlwm yooj yim. Nws yog cov txheej txheem uas tsim cov yeeb yaj kiab oxide dub (tsuas yog tsim los ntawm hlau oxide, Fe₃O₄) ntawm cov hlau nto los ntawm cov tshuaj tiv thaiv. Cov hom muaj xws li:
3.1 Siab -Tub kub Alkaline Dub Oxide (Tsev Txheej Txheem Cai)
Lub hauv paus ntsiab lus: Hlau reacts nrog oxidants nyob rau hauv ib tug alkaline tov (tsuas yog tsim ntawm sodium hydroxide thiab sodium nitrite) ntawm 135℃mus rau 150℃los tsim ib tug tuab oxide zaj duab xis.
Qhov zoo: Cov cuab yeej siv yooj yim, tus nqi qis, thiab kev ua haujlwm siab.
Qhov tsis zoo: Cov tshuaj kho mob muaj cov khoom tsis zoo xws li sodium nitrite, ua rau muaj kev kub ntxhov rau ib puag ncig. Tom qab kev kho mob oxide dub, tom qab- kev kho mob xws li saponification thiab roj immersion yuav tsum tau ua kom muaj peev xwm tiv thaiv xeb.
3.2 Chav -Tsub Chemical Dub Oxide
Lub hauv paus ntsiab lus: Ib zaj duab xis dub yog tsim rau ntawm lub ntsia liaj qhov rooj los ntawm cov tshuaj tiv thaiv redox siv chav -kub blackening agent uas muaj tooj liab, selenium, sulfur, thiab lwm yam khoom.
Cov yam ntxwv: Kev kho cua kub qis thiab ceev ceev, haum rau cov xwm txheej uas yuav tsum tau ua sai. Txawm li cas los xij, txheej txheej zaj duab xis yog nyias (feem ntau yog 0.5-1.5 microns), thiab nws txoj kev tiv thaiv xeb yog txwv thaum siv ib leeg, yuav tsum tau siv cov roj sib xyaw ua ke.
4. Kev Kho Dacromet
Dacromet kev kho mob muaj xws li txheej txheej ntsia liaj qhov rooj nrog ib txheej uas yog tsim los ntawm zinc hmoov, txhuas hmoov, chromate (ib puag ncig tus phooj ywg qauv yog chromium{0}}dawb), thiab deionized dej los ntawm dipping los yog tshuaj tsuag, ua raws li los ntawm ci ntawm 180 -250℃los tsim ib tug tuab zinc zaj duab xis{4}. Cov txheej txheem no tsis tas yuav tsum tau pickling, yog li zam kom tsis txhob muaj hydrogen embrittlement, thiab tshwj xeeb tshaj yog haum rau siab - lub zog bolts. Cov tsos mob feem ntau yog nyiaj - grey lossis silvery-dawb.
Cov yam ntxwv tseem ceeb
Superb corrosion kuj: Txawm hais tias txheej thickness tsuas yog 4-8 microns, nws muaj peev xwm tiv thaiv xeb yog 7-10 npaug ntawm cov tsoos electrogalvanizing. Qhov nruab nrab ntsev tshuaj tsuag tuaj yeem ncav cuag 1200 teev yam tsis muaj xeb liab.
High-kub tsis kam: Nws tuaj yeem tiv taus siab- qhov kub thiab txias ib puag ncig hauv qab 300 degree, ua rau nws haum rau cov ntsia hlau siv hauv siab - qhov kub thiab txias xws li cov cav thiab cov kav dej.
Environmental friendliness: Ib puag ncig tus phooj ywg Dacromet yog dawb ntawm hexavalent chromium thiab tsis tso cov dej khib nyiab los yog roj pov tseg, ua raws li cov qauv ib puag ncig.
Cov khoom siv tshuab: Cov txheej txheej muaj qhov nyuaj siab (HV 300-500), hnav tsis kam zoo dua li cov txheej txheej electroplated, thiab muaj zog adhesion, uas tuaj yeem nkag mus rau hauv cov txheej txheem nyuaj xws li qhov tob thiab qhov khoob.
Tsis muaj kev pheej hmoo hydrogen embrittlement: Nws tsis tas yuav muaj cov txheej txheem pickling lossis electrolysis, tshem tawm hydrogen embrittlement. Nws yog qhov tshwj xeeb tshaj yog tsim rau cov khoom muaj zog xws li cov springs thiab siab - lub zog bolts.
Cov ntsiab lus ntawm kev tiv thaiv xeb muaj peev xwm, qhov zoo, thiab qhov tsis zoo ntawm cov txheej txheem kho saum npoo
Kev Tiv Thaiv Kev Ruaj Ntseg Ruaj Ntseg (raws li Neutral Salt Spray Test)
Dacromet > electrophoretic dub > Galvanizing (kub-dip galvanizing > electrogalvanizing) > Nickel plating > Dub oxide / Phosphating
Lus Cim: Lub peev xwm tiv thaiv xeb ntawm stainless hlau stems los ntawm nws cov khoom nws tus kheej (muaj cov ntsiab lus xws li chromium thiab npib tsib xee) es tsis yog txheej txheem kho saum npoo, yog li nws tsis suav nrog hauv qeb duas. Yog tias cov hlau tsis muaj hlau ua ke nrog kev kho deg (xws li passivation), nws cov peev xwm tiv thaiv xeb yuav raug txhim kho ntxiv.
Cov ntsiab lus tseem ceeb sib piv
Dacromet: Kev tiv thaiv xeb zoo tshaj plaws, tsis muaj hydrogen embrittlement, siab -kub tsis kam, tab sis tus nqi siab thiab ib qho xim zoo nkauj.
Galvanizing: Tus nqi nruab nrab, ntau hom kev xaiv. Kub-dip galvanizing muaj kev tiv thaiv xeb zoo dua li electrogalvanizing, tab sis electrogalvanizing muaj kev pheej hmoo ntawm hydrogen embrittlement.
Nickel plating: zoo zoo nkauj nyhuv thiab siab hardness, haum rau precision los yog hniav bolts, nrog nruab nrab xeb tiv thaiv muaj peev xwm.
Dub oxide: Tus nqi qis tshaj plaws thiab kev ua haujlwm yooj yim, tab sis muaj peev xwm tiv thaiv xeb tsis muaj zog, xav tau tom qab- kev kho mob, tsim nyog rau cov nqi qis thiab luv luv - cov xwm txheej tiv thaiv.
Koj puas xav kom kuv txheeb aCov lus sib piv ntawm cov txheej txheem bolt nto kho, npog cov cim tseem ceeb xws li kev tiv thaiv corrosion, nqi, cov xwm txheej, thiab kev ceev faj, rau kev siv ceev thiab xaiv?
