Txhawm rau txhim kho kev txhim kho kev kub ntxhov thiab cov khoom zoo nkauj ntawm cov ywj pheej ntawm lub cev (lub caij nplooj ntoo caij nplooj ntoos hlav, conical washers, ntxhuav zeb, ntxhuav tshuab, thiab lwm yam), cov kev kho mob xws li blackening, phosphating, electroplating, thiab cov zoo li feem ntau yuav tsum tau. Electrolytic galvanization thiab passivation yog siv ntau dua.
Tsis tas li ntawd, lub zog ntawm tus tuav lub nplais yog feem ntau ntawm 42-50HRc. Vim yog cov khoom thiab cov kev kho deg, nws tseem nkag siab txog hydrogen. Tom qab lub tshuab electroplating, kev tshem tawm kev haus dej hiav tsis ua tiav lub hom phiaj ntawm kev tsav tsheb hydrogen, thiab cov residual hydrogen ua rau elasticity. Ncua lub tog raj tsoo.
Tam sim no, lub rupture ntawm elastic fasteners los ntawm kev ncua lub rupture ntawm hydrogen embrittlement yog ib qho teeb meem loj teeb meem. Cov neeg muaj peev xwm txais yuav ntau hom kev kawm los txo thiab tiv thaiv kom tsis txhob muaj teeb meem ntawm cov xaim hluav taws xob ntawm cov dej khov.
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1. Cov nyom ntawm cov khoom siv tsis raug
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Qhov dej cawv los ntawm qhov teeb meem ntawm qhov teeb meem ntawm cov khoom siv khawm ntawm electrogalvanizing tsis tuaj yeem tsis lees paub. Piv txwv li, me ntsis cov kab nrig ntawm cov nplaim hlau, khawb, cov khib nyiab, thiab cov kab uas muaj ntau tshaj qhov uas qhov tob yuav ua rau muaj teeb meem loj heev rau ntawm lub vaub voos sab nraud. Kev cuam tshuam, khawb ntawm qhov chaw ua los ntawm txoj kev tsis zoo thiab kev sib sau, kev nyuab siab hauv zos yuav muaj teebmeem tshwm sim.
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2. Nyhuv ntawm txheej txheem kho kub
Cov txheej txheem kev kub txheej kub muaj kev cuam tshuam rau cov kab mob hydrogen tom qab electrogalvanizing ntawm cov voj voos hluavtaws. Yog hais tias qhov hardness ncav 45HRc (carbon steel), nws yuav induce los yog ua rau cov ywj phuam ntawm cov tog hniav nrawm.
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Nyob rau hauv qhov chaw ntawm kev ua kom tsis muaj qhov tsis zoo ntawm kev kho cua sov, xaiv lub ntsuas cua kub kom tsim nyog, lub sij hawm cua sov tsim nyog, thiab siab npau taws. Thiaj li ua kom tshem tawm cov nqaij nyuab siab thiab thermal kev nyuaj siab thiab tsis txhob muaj teebmeem tshwm sim. Cov dej khov thiab cov cua sov yuav tsum tau tiv thaiv kom tsis txhob oxidation thiab decarburization, mesh siv cov cua sov muaj peev xwm tswj tau ntawm 0.60% -0.70%, ntsev da dej rau lub qhov cub yuav tsum yog kev ua kom dexidation slag, kev soj ntsuam tawv nruj, nruj xim rau txheej txheej los ntawm kev nyuaj ntawm kev dag cuav , yog li ntawd lub hardness xeem nqi distortion. Feem ntau yuav tsum tau tswj ntawm 42-44HRc zoo, tsis pub tshaj 45HRc.
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3. Nyhuv ntawm cov txheej txheem electroplating
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Vim yog qhov ua kom tsis txhob muaj roj, feem ntau ntawm cov leeg ntim tho hnyuv tau ua rau lub pob txha tawg thiab ua rau muaj kev piam sij. Hydrogen evolution Hydrogen seepage yog tsis muaj kev tiv thaiv nyob rau hauv tag nrho electrolytic galvanization, thiab cov dej hydrogen tau nkag mus rau hauv cov txheej txheej thiab tseem txeem rau hauv cov qauv hlau. Qhov dej tsis haum ntawm zinc yog li 0.001% -0.100%, thaum uas cov hlau carbon alloy yog li ntawm 0.1%. Hydrogen distorts lub siv lead ua ntxig hauv cov hlau thiab ua rau lub hauv paus sab nrauv loj, ua rau nws txo qis dua nws cov khoom siv dag zog. Cov evolution of hydrogen tsis tsuas yog cuam tshuam rau cov khoom ntawm lub txheej, xws li cov xws li pinholes, cov qhov dej, thiab cov npuas, tab sis kuj nkag mus rau hauv lub hauv paus hlau. Lub toughness ntawm cov hlau yog zoo heev txo, resulting glittle tawg ntawm ib feem. Yog vim li cas rau cov evolution hydrogen tsis yog nyob rau hauv kev kho cua kub tab sis kuj nyob rau hauv cov cua sov siab dua. Hydrogen tau yooj yim infiltrate cheeb tsam kev nyuab siab concentration ntawm qhov chaw. Hydrogen evolution tshwm sim hauv ob qho tib si pickling thiab electroplating.The
4. Kev tiv thaiv ntawm hydrogen embrittlement
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Ua ntej qhov electroplating ntawm zinc, nws yog qhov yuav tsum tau tswj kom ncaj qha tswj cov electrolysis ntawm cov cathode. Kev siv lub tshuab hluav taws xob (tshwj xeeb yog lub thickness ntawm 1mm), nws tsis haum rau siv lub cathodic electrolysis kom tshem tawm cov roj, tab sis siv anode electrolysis kom tshem tawm cov roj, tshuaj degreasing los yog ultrasonic degreasing, thiab cov tshuaj ntxuav hlau yuav siv tau los tshem tawm cov roj (zoo dua cov nyhuv).
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Rau cov vag tshuab, nws tsis haum siv cov kua qaub zog kom corrode. Xwb, xuab zeb blasting los yog xuas peening yog siv los ua kom lub hom phiaj ntawm purifying thiab activating lub ntsej muag. Thaum pickling thiab activating kho mob yuav tsum tau ua, hydrochloric acid yog zoo dua sulfuric acid. Them nyiaj kom paub lub sij hawm deev tsis pub ntev heev (txhua txoj kev tswj 30-60s), nrog ntau lub sij hawm luv luv ntev dua cov txiaj ntsim ntev ntev.
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Cov xim electrolyte uas muaj cov hlwv me me yuav tsum raug xaiv. Feem ntau, cov zinc electrolyte galvanized zis tsis muaj tus txheeb ze hydrogen evolution thiab tsawg dua ntawm hydrogen embrittlement, thaum cyanide galvanized electrolyte muaj ntau dua hydrogen evolution thiab hydrogen permeability. Lub caij nyoog ntawm cov roj ntsha hnyav tau ntau dua.
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Kev siv dej hiav txwv zoo tuaj yeem siv los cuam tshuam rau hydrogen infiltration thiab txo qhov kev nyuaj siab rau hydrogen. Dej hydrogen dej nyab feem ntau yog 190-230 ° C thiab lub caij dej nyab hydrogen yog 6-8h. Nws yuav tsum tau nqa tawm hauv 2 xuab moos ua ntej pib hla tawm tom qab electro-galvanizing. Lub sij hawm luv luv qhov chaw nyob, zoo dua.