Qhov tseeb, hnub no tus Xiaobian yog ib txoj kev kho mob hauv cov khoom kho qhov muag. Nws yog qhov ncaj qha los tiv thaiv oxidation txheej kev kho mob hu ua "blackening". Koj tuaj yeem nyeem nqe lus no yog tias koj xav paub ntau ntxiv txog kev kho vajtse.
Blackening yog ib txoj kev rau kev kho cua sov ntawm cov hlau. Lub hauv paus ntsiab lus yog los tsim ib zaj duab xis oxide ntawm lub hlau ntaws kom tiv thaiv tau cov pa los ntawm kev siv lub hom phiaj ntawm xeb kev tiv thaiv. Yog hais tias qhov tsos tsis zoo yuav tsum tsis siab, kev siv blackening yuav siv tau, thiab qhov dub ntawm qhov chaw ntawm lub hlau yog tseem hu ua xiav.
Kev kho xiav yog ib qho tshuaj kho tshuaj lom neeg. Nws lub ntsiab muaj nuj nqi yog tsim ib cov yeeb yaj kiab oxide rau saum npoo ntawm lub workpiece los tiv thaiv kev txhuam ntawm lub workpiece, thiab nws kuj ua tau zoo coj los ua haujlwm ntawm lub chaw ua haujlwm. Nws tsuas yog ib qho kev kho mob saum npoo thiab yog li tsis tsim cov ntaub so ntswg. Cov nyhuv, nws tsis yog qhov txawv ntawm kev kho cua sov thiab kev quenching.
Cov txheej txheem niaj zaus ntawm blackening yog ib txwm alkaline sov thiab blackening, raws li tau zoo raws li cov tsos ntawm lig blackening nyob rau ntawm chav tsev kub. Txawm li cas los xij, Xiao Bian hais tias qhov txheej txheem blackening nyob ntawm chav tsev kub tsis zoo heev rau cov qis carbon tsawg. Lub alkaline blackening subdivided thiab muaj lwm qhov sib txawv ntawm blackening thiab blackening. Lub ntsiab ntawm cov kua dej yog cov sodium hydroxide thiab sodium nitrite. Ib qho chaw zoo tuaj yeem tau ntawm nruab nrab ntawm 135 thiab 155 degrees Celsius. Koj tsuas yog yuav tsum tau them nyiaj rau lub sijhawm ntev npaum li cas.
Blackening nyob rau hauv kev kho vajtse fasteners feem ntau tsuas yog kho raws li ib qho yooj yim anti-oxidation txheej. Cov nyhuv no tsuas yog siv ntawm cov kev tiv thaiv zoo tib yam thiab kev tiv thaiv cov khaubncaws sab nraud. Nws tsis raug siv raws li muaj tseeb tiv thaiv corrosion txheej, yog li qhov chaw blackened Nws yog qhov zoo tshaj plaws tsis txhob cia nyob rau hauv ib puag ncig qhuav rau ntau tshaj ob lub hlis.
Qhov thib ob, cov dub txheej plating tsis yog txheej txheej txheej txheej, thiab yog ib qho oxide zaj duab xis uas yog tshwm sim los ntawm qhov chaw oxidation ntawm cov hlau. Txij li thaum lub sij hawm tsaus ntuj yog luv luv, zaj duab xis thickness tsis tswj, thiab cov kev pab ntawm tag nrho cov chaw yog ib yam khoom tsim nyog.