(1) Yog hais tias tus "dawb xeb" pom dawb, ua ntej ntxuav nws tawm hauv dej, ces qhuav cov txheej zinc txheej nrog ib daim ntaub. Thov muab tshuaj txhuam ua los ntawm kev sib xyaw cov hmoov Tycum thiab sodium hydroxide nrog txhuam. (2) Yog hais tias tus "dawb xeb" tau muab ib lub greyish, siv ib qho acidic poov tshuaj totassium tartrate thiab ammonium carbonate daws cov cheeb tsam cuam tshuam. Tshem tawm cov corrosion nrog cov txhuam cev ntub dej calaked hauv calcium carbonate, tom qab ntawd thiab qhuav kom huv.
15.2. Cov hau kev kom tshem tawm cov xim dawb
Nov 19, 2025
Xa kev nug
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