Ekubeni iindawo ezityebileyo zenziwa kumphezulu, amacandelo ashinyeneyo kwaye antsonkothileyo wesikali, ezo ndawo zicocayo zinobunzima. Ukususwa okunjalo kwe-oksidi ekhululekile isikali ngokwenyathelo lokukhetha lokususa uthuthu olujingayo olwenziweyo.

1, Isikali esixeliweyo:
I-2, i-Pickling operation: emva kwesikali esikhululekileyo, esihlala sidityaniswe kwiindawo zomgangatho we-gray ejingayo, uthuthu olujingayo emva kokususa i-oxide passivation.
I-3, Ukususwa kwenyathelo lokusebenza lokuxhoma uthuthu: Amacandelo emva kwenkqubo yokuchola i-pickling passivation yokunganyangeki emoyeni, njengokuba sesichengeni somoya, iindawo zomhlwa. Ukomeleza ukuxhathisa komhlwa kwamalungu, amalungu kufuneka avelise umphezulu oxineneyo, ukuxhathisa kokutya okufanelekileyo kwefilimu ye-passive, ukuze kufezekiswe injongo yokumelana nomhlwa. Ifilimu yePassivation ilungile okanye imbi iya kuchaphazela ngokuthe ngqo umgangatho wobomi kunye neenxalenye zembonakalo, izinto ezichaphazela umgangatho wokubunjwa kwefilimu ye-passivation kunye nomgangatho wezinto eziphambili zesisombululo se-passivation.