I-Passivation ichazwa njengokwakheka komgangatho onqabileyo okhuselayo kumphezulu wezinto zetsimbi phantsi kweemeko ze-oxidizing, eziphunyezwe yi-anodic polarization enamandla, ukuvimbela ukubola.Ezinye iintsimbi okanye i-alloys ziphuhlisa umaleko olula wokuthintela kwi-activation potential okanye phantsi kwe-anodic polarization ebuthathaka, ngaloo ndlela inciphisa izinga lokubola.Ngokwenkcazo ye-passivation, le meko ayiweli phantsi kwe-passivation.
Ubume befilimu ye-passivation buncinci kakhulu, kunye nomlinganiselo wobunzima ukusuka kwi-1 ukuya kwi-nanometers ye-10.Ukufunyanwa kwe-hydrogen kwifilimu encinci ye-passivation ibonisa ukuba ifilimu ye-passivation ingaba yi-hydroxide okanye i-hydrate.I-Iron (Fe) kunzima ukwenza ifilimu ye-passivation phantsi kweemeko eziqhelekileyo zokubola;kwenzeka kuphela kwiindawo ezine-oxidizing kakhulu kwaye phantsi kwe-anodic polarization ukuya kwizinto eziphezulu.Ngokwahlukileyo, i-chromium (Cr) inokwenza ifilimu ezinzileyo, exineneyo, kunye nekhuselayo nakwindawo ene-oxidizing enobulali.Kwii-alloys ezisekelwe kwi-iron equkethe i-chromium, xa umxholo we-chromium udlula i-12%, ibizwa ngokuba yintsimbi engenasici.Intsimbi engatyiwayo inokugcina imo yokudlula kwizisombululo ezininzi ezinamanzi aqulethe umkhondo womoya.I-Nickel (Ni), xa ithelekiswa nentsimbi, ayinayo kuphela iipropathi ezingcono zoomatshini (kubandakanya amandla obushushu obuphezulu) kodwa ikwabonisa ukuxhathisa okugqwesileyo kokutya kuzo zombini ezingezizo i-oxidizing.
Ukwenziwa kweMetal Passivation kunye nokutyeba kweFilimu yePassivation
I-Passivation ichazwa njengokwakheka komgangatho onqabileyo okhuselayo kumphezulu wezinto zetsimbi phantsi kweemeko ze-oxidizing, eziphunyezwe yi-anodic polarization enamandla, ukuvimbela ukubola.Ezinye iintsimbi okanye i-alloys ziphuhlisa umaleko olula wokuthintela kwi-activation potential okanye phantsi kwe-anodic polarization ebuthathaka, ngaloo ndlela inciphisa izinga lokubola.Ngokwenkcazo ye-passivation, le meko ayiweli phantsi kwe-passivation.
Ubume befilimu ye-passivation buncinci kakhulu, kunye nomlinganiselo wobunzima ukusuka kwi-1 ukuya kwi-nanometers ye-10.Ukufunyanwa kwe-hydrogen kwifilimu encinci ye-passivation ibonisa ukuba ifilimu ye-passivation ingaba yi-hydroxide okanye i-hydrate.I-Iron (Fe) kunzima ukwenza ifilimu ye-passivation phantsi kweemeko eziqhelekileyo zokubola;kwenzeka kuphela kwiindawo ezine-oxidizing kakhulu kwaye phantsi kwe-anodic polarization ukuya kwizinto eziphezulu.Ngokwahlukileyo, i-chromium (Cr) inokwenza ifilimu ezinzileyo, exineneyo, kunye nekhuselayo nakwindawo ene-oxidizing enobulali.Kwii-alloys ezisekelwe kwi-iron equkethe i-chromium, xa umxholo we-chromium udlula i-12%, ibizwa ngokuba yintsimbi engenasici.Intsimbi engatyiwayo inokugcina imo yokudlula kwizisombululo ezininzi ezinamanzi aqulethe umkhondo womoya.I-Nickel (i-Ni), xa kuthelekiswa nentsimbi, ayinayo kuphela iipropati ezingcono zoomatshini (kubandakanya amandla obushushu obuphezulu) kodwa iphinda ibonise ukuxhathisa kwe-corrosion egqwesileyo kuzo zombini iindawo ezingenayo i-oxidizing kunye ne-oxidizing.Xa umxholo we-nickel kwi-iron udlula i-8%, uzinzisa i-cubic structure ye-austenite egxininiswe ebusweni, iphucula ngakumbi amandla okugqithisa kunye nokuphucula ukukhuselwa kwe-corrosion.Ke ngoko, i-chromium kunye ne-nickel zizinto ezibalulekileyo zokudibanisa kwi-steel. kunye ne-oxidizing bume.Xa umxholo we-nickel kwi-iron udlula i-8%, uzinzisa i-cubic structure ye-austenite egxininiswe ebusweni, iphucula ngakumbi amandla okugqithisa kunye nokuphucula ukukhuselwa kwe-corrosion.Ke ngoko, i-chromium kunye ne-nickel zizinto ezibalulekileyo zokudibanisa kwintsimbi.
Ixesha lokuposa: Jan-25-2024