Pretreatment suav nrog cov txheej txheem yooj yim ntawm phau ntawv thiab cov txheej txheem pretreatment tsis siv neeg, qhov kawg ntxiv muab faib ua cov tshuaj tsuag tsis siv neeg thiab tsis siv neeg dip txau. Ua ntej hmoov txheej, workpieces yuav tsum tau kho saum npoo kom tshem tawm cov roj thiab xeb. Cov theem no siv ntau yam tshuaj, feem ntau yog xeb tshem tawm, degreasers, deg conditioners, thiab phosphating agents.
Hauv seem pretreatment los yog rhiav ntawm txheej txheej ntau lawm, thawj qhov tseem ceeb yog tsim cov txheej txheem tsim nyog rau kev yuav khoom, kev thauj mus los, kev cia, thiab kev siv cov kua qaub thiab alkalis muaj zog; muab cov khaub ncaws tiv thaiv tsim nyog rau cov neeg ua haujlwm; xyuas kom ruaj ntseg thiab txhim khu kev qha ntim, tuav, thiab khoom siv; thiab tsim cov kev ntsuas thaum muaj xwm ceev thiab cov txheej txheem cawm thaum muaj xwm txheej. Qhov thib ob, vim hais tias cov txheej txheem pretreatment ntawm cov txheej txheej txheej ua rau muaj qee cov roj pov tseg thiab cov kua dej pov tseg, kev tiv thaiv ib puag ncig yuav tsum suav nrog cov pa tawm, tso dej, thiab cov khoom siv pov tseg.
Qhov zoo ntawm pretreated workpieces yuav sib txawv vim qhov sib txawv ntawm pretreatment solutions thiab txheej txheej ntau lawm kab. Rau qhov zoo- kho workpieces nrog tag nrho cov saum npoo av thiab xeb tshem tawm, phosphating los yog passivation kev kho feem ntau yog ua ob peb zaug tom qab pretreatment los tiv thaiv xeb dua nyob rau hauv lub sij hawm luv luv. Ua ntej hmoov txheej, phosphate workpieces yuav tsum tau qhuav kom tshem tawm cov dej noo. Rau me me -batch, ib zaug - khoom tsim, huab cua qhuav, hnub ziab, lossis cua ziab feem ntau yog siv. Rau loj -batch, sib dhos kab ntau lawm, qis- kub kom qhuav yog feem ntau saws siv qhov cub los yog kom qhuav qhov.
