Iintsimbi ezininzi ziya kwenza ifilimu ye-oxide phezu komhlaba ngexesha lenkqubo yokusabela nge-oxygen emoyeni.Kodwa ngelishwa, iikhompawundi ezenziwe kwi-carbon steel eqhelekileyo iya kuqhubeka i-oxidize, ibangela ukuba umhlwa wande ngokuhamba kwexesha, kwaye ekugqibeleni wenze imingxuma.Ukunqanda le meko, ngokuqhelekileyo sisebenzisa ipeyinti okanye iintsimbi ezikwaziyo ukumelana ne-oxidation (ezifana ne-zinc, nickel, kunye ne-chromium) ukwenza i-electroplating kumphezulu we-carbon steel.
Olu hlobo lokhuselo luyifilimu yeplastiki nje.Ukuba uluhlu olukhuselayo lutshabalaliswa, intsimbi engaphantsi iya kuqala ukugqwala.Apho kukho imfuneko, kukho isisombululo, kwaye ukusetyenziswa kwensimbi engenasici kunokusombulula ngokugqibeleleyo le ngxaki.
Ukuxhatshazwa kwe-corrosion yensimbi engenasici kuxhomekeke kwinto ethi "chromium" ekubunjweni kwayo, kuba i-chromium yenye yamacandelo ensimbi, ngoko ke iindlela zokukhusela azifani.Xa umxholo we-chromium ufikelela kwi-10.5%, ukuxhathisa kwe-atmospheric corrosion of steel kwanda kakhulu, kodwa xa umxholo we-chromium uphezulu, nangona ukuxhatshazwa kwe-corrosion kusenokuphuculwa, umphumo awubonakali.
Isizathu kukuba xa i-chromium isetyenziselwa ukomeleza unyango lwentsimbi, uhlobo lwe-oxide yangaphandle lutshintshwa lube yi-oxide yomhlaba efana naleyo yenziwe kwintsimbi ecocekileyo yechromium.Le oxide yentsimbi ibambene ngokuqinileyo nechromium ikhusela umphezulu kwioksidi engakumbi yomoya.Olu hlobo lomaleko we-oxide lubhityile kakhulu, kwaye ukukhazimla kwendalo kumphandle wentsimbi kunokubonwa ngalo, okwenza intsimbi engenasici ibe nomphezulu wesinyithi okhethekileyo.
Ngaphezu koko, ukuba i-surface layer iyonakala, indawo evezwayo yobuso iya kuzilungisa ngokwayo kunye ne-atmospheric reaction kwaye iphinde yenze le "filimu ye-passive" ukuqhubeka nokudlala indima yokukhusela.Ngoko ke, zonke iintsimbi ezingenasici zinempawu eziqhelekileyo, oko kukuthi, umxholo we-chromium ungaphezu kwe-10.5%.
Ixesha lokuposa: Dec-19-2022