Galvanizing yog hais txog cov txheej txheem kho saum npoo ntawm plating txheej zinc ntawm cov hlau, hlau lossis lwm yam khoom siv rau lub hom phiaj ntawm kev zoo nkauj thiab xeb tiv thaiv.Cov txheej txheem tseem ceeb yog kub dip galvanizing.
Zinc yog soluble nyob rau hauv acids thiab alkali, yog li nws yog hu ua amphoteric hlau.Zinc hloov me ntsis nyob rau hauv qhuav huab cua.Nyob rau hauv cov huab cua ntub, zinc nto yuav tsim ib tug ntom yooj yim zinc carbonate zaj duab xis. Muaj sulfur dioxide, hydrogen sulfide thiab Marine cua, zinc corrosion. kuj tsis zoo, tshwj xeeb tshaj yog nyob rau hauv kub thiab high humidity uas muaj cov organic acid cua, zinc txheej yog yooj yim rau corroded.Tus qauv electrode peev xwm ntawm zinc yog -0.76v.Rau cov hlau matrix, zinc txheej belongs rau anodic txheej, uas yog siv los tiv thaiv corrosion ntawm hlau.Nws cov kev tiv thaiv kev ua tau zoo muaj kev sib raug zoo nrog cov tuab ntawm txheej.Qhov kev tiv thaiv thiab cov khoom zoo nkauj ntawm zinc txheej tuaj yeem txhim kho tau zoo los ntawm passivation, staining lossis txheej nrog tus neeg sawv cev tiv thaiv.
Lub hauv paus ntsiab lus yog kom sai oxidize nto ntawm hlau thiab hlau cov khoom los tsim ib tug ntom oxide zaj duab xis tiv thaiv txheej.Nws muaj ob feem ntau siv txoj kev ntawm blackening: tsoos alkaline cua sov blackening thiab lig blackening nyob rau hauv chav tsev kub.Tab sis cov nyhuv ntawm chav tsev kub blackening txheej txheem. Ntawm cov pa roj carbon tsawg tsis zoo.Nws yog qhov zoo dua rau blacken A3 steel nrog alkali.Alkalescent blackening yog subdivided, muaj dua blackening thiab ob blackening distinction.Lub ntsiab Cheebtsam ntawm dub cawv yog sodium hydroxide thiab sodium nitrite.Qhov kub yuav tsum tau rau blackening yog dav, xws li ntawm 135 degrees Celsius mus rau 155 degrees Celsius, thiab koj tau txais ib tug zoo nto, tab sis nws yuav siv sij hawm ib co sij hawm.Nyob rau hauv lub tswv yim ua hauj lwm, mloog yuav tsum tau them rau qhov zoo ntawm xeb thiab roj tshem tawm ua ntej blackening ntawm lub workpiece, thiab lub passivation roj immersion tom qab blackening.Qhov zoo ntawm blackening feem ntau txawv nrog cov txheej txheem.Hlau "bluing" tshuaj kua kua txais alkaline oxidat.ion los yog acid oxidation.Cov txheej txheem ntawm kev tsim cov oxide zaj duab xis ntawm cov hlau nto los tiv thaiv corrosion yog hu ua "bluing".Cov oxide zaj duab xis tsim rau saum npoo ntawm cov hlau dub tom qab "bluing" kev kho mob, txheej txheej yog tsuas yog ferric oxide thiab cov txheej sab hauv yog ferrous oxide.
Siab - lub zog bolts feem ntau yog siv rau hauv cov pob qij txha tseem ceeb, raug kev nruj dua thiab shear.Cov kauj ruam kawg ntawm kev ua cov ntsia hlau yog kev kho cua sov, feem ntau hu ua quenching, kom lub zog ntawm bolts.Txawm li cas los xij, hydrogen embrittlement tshwm sim yooj yim hauv cov txheej txheem ntawm galvanizing bolts.Hydrogen embrittlement feem ntau yog tus cwj pwm los ntawm kev ncua kev puas tsuaj.Qhov no txo lub zog ntawm lub zog siab zog bolts.Yog li ntawd, cov nplaim dub uas ua los ntawm kev kho cua sov ntawm lub zog siab bolts yog ib qho ruaj khov oxidation zaj duab xis.Nws yuav tsis xeb thaum nws. tsis nyob rau hauv kev sib cuag nrog corrosive tshuaj.
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Post lub sij hawm: Sep-09-2019