Cov kauj ruam yooj yim rau blackening kev kho mob ntawm ib lub taub hau raj

Qhov yuav tsum tau ua ntej rau kev tuav cov blackening yog khaws rau saum npoo cua sov huv si thiab huv si. Yog hais tias muaj impurities ntawm nws cov tsos, nws yuav tsis conducive rau kev kho mob ntawm blackening.

Thawj qhov uas yuav tsum tau ua yog kom nkag siab txog cov organic teeb meem sab nraud, hu ua degreasing kev kho mob. Tsis txhob txhawj txog qhov no. Degreasing yog ib qho yooj yim ua. Tsuav muaj degreasing kua rau degreasing. Cov kua dej degreasing kuj yooj yim muaj nyob hauv khw. Qhov yuav tsum tau rau degreasing yog qhov yuav tsum tau rau pH ntawm cov kua. Nws yuav tsum tuav lub alkalinity siab heev, thiab tus nqi pH yuav tsum ruaj khov ntawm li 13. Lub sij hawm xav tau yog kwv yees li 30 feeb. Tom qab qhov no ua tiav, sab nrauv yuav tsum tau muab ntxuav kom tshem tawm cov impurities uas yog tsim los ntawm cov tshuaj tiv thaiv. Cov dej huv yuav tsum tau siv los ntxuav kom huv si kom huv si ntawm qhov chaw ntawm lub raj cua sov.