Mhedzisiro yepickling uye passivation panguva yekugadzira, welding, kuyedza, uye kupisa kurapwa kuchaita kuti iron oxide, welding slag, girisi, uye imwe tsvina iungane pamusoro pepombi (kabhoni simbi pombi, kabhoni copper pombi, simbi isina tsvina pombi) , iyo inoderedza kusagadzikana kwekuora kwepombi yesimbi. Variety. Pickling ikemikari yekubvisa ngura nzira: dilute acid inobvisa ngura inonyanya kubvisa okisidhi yesimbi pamusoro pepombi dzesimbi isina mweya ine oxygen. Kune simbi dzine simbi, inonyanya kureva iron oxide, iyo kemikari inopindirana neaya simbi oxides uye inoanyungudutsa muasidhi kuti iite chinangwa chekubvisa ngura. Usati watora uye kubvisa ngura, girisi pamadziro epombi yesimbi isina tsvina inofanira kutanga yabviswa, nokuti kuvapo kwegirisi kunodzivirira mvura yepickling kuti isasangana nemadziro epombi yesimbi. Inokanganisa maitiro ekubvisa ngura. Mapaipi asina oiri (akadai semapaipi esimbi isina okisijeni) anofanira kutanga abviswa mafuta. Pickling inoreva kushandisa pickling mhinduro senge sulfuric acid kushambidza oxide layer uye guruva pane workpiece. Phosphating inzira yekurapa yekuchenesa pamusoro.