Ekubeni iindawo ezityebileyo zenziwa kumphezulu, amacandelo ashinyeneyo kwaye antsonkothileyo kwisikali, ezo ndawo zicocayo zinobunzima.Ukususwa okunjalo kwe-oksidi yesikali ekhululekileyo ngokwenyathelo lokukhetha lokususa uthuthu olujingayo olwenziwe.

1, Isikali esixeliweyo:
I-2, i-Pickling operation: emva komlinganiselo okhululekileyo, uhlala uncanyathiselwe kwiindawo zomgangatho we-gray ejingayo, uthuthu olujingayo emva kokususa i-oxide passivation.
I-3, Ukususwa kwenyathelo lokusebenza lokuxhoma uthuthu: Amalungu emva kwenkqubo yokuchola i-pickling passivation engalunganga yokunganyangeki emoyeni, njengokuba sesichengeni somoya, iindawo zomhlwa.Ukomeleza ukuxhathisa komhlwa kwamalungu, amalungu kufuneka enze umphezulu oxineneyo, ukuxhathisa okuhle kokubola kwefilimu engenziyo, ukuze kuphunyezwe injongo yokuxhathisa umhlwa.Ifilimu ye-Passivation 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.