Ukumelana nokugqwala okuhle kakhulu kwensimbi engagqwali kubangelwa ukwakheka kwefilimu ye-oxide engabonakali ebusweni bensimbi, okwenza kube yinto engenzi lutho.Le filimu yokwenziwa yakhiwa ngenxa yensimbi ephendulana nomoya-mpilo lapho ichayeke emkhathini, noma ngenxa yokuxhumana nezinye izindawo eziqukethe umoya-mpilo.Uma ifilimu ye-passivation ibhujiswa, insimbi engagqwali izoqhubeka nokugqwala.Ezimweni eziningi, ifilimu ye-passivation ibhujiswa kuphela endaweni yensimbi nasezindaweni zasendaweni, futhi umphumela wokugqwala uwukwenza izimbobo ezincane noma imigodi, okuholela ekugqwaleni okusatshalaliswa ngokungavamile okufana nomgodi ebusweni bento.
Ukwenzeka kokugqwala kwe-pitting kungenzeka kungenxa yokuba khona kwama-ion e-chloride ahlanganiswe nama-depolarizer.Ukugqwala komgodi wezinsimbi ezingenzi lutho njengensimbi engagqwali kuvame ukubangelwa ukulimala kwendawo kwama-anion athile anolaka kufilimu ye- passive, ukuvikela isimo sokungenzi lutho esinokumelana nokugqwala okuphezulu.Ngokuvamile kudingeka indawo ene-oxidizing, kodwa lesi yisona simo lapho ukugqwala kwe-pitting kwenzeka ngaphansi kwaso.Indawo yokugqwala kwe-pitting ukuba khona kwama-ion ensimbi esindayo afana ne-FE3+, Cu2+, Hg2+ ku-C1-, Br-, I-, Cl04-solutions noma izixazululo ze-chloride ze-Na+, Ca2+ alkali nama-ion ensimbi yomhlaba ane-alkali aqukethe i-H2O2, O2, njll.
Izinga le-pitting liyakhuphuka ngokukhuphuka kwezinga lokushisa.Isibonelo, kwisisombululo esine-concentration ye-4% -10% ye-sodium chloride, ukulahlekelwa kwesisindo esiphezulu ngenxa yokugqwala kwe-pitting kufinyelelwa ku-90 ° C;ukuze uthole isixazululo esincibilikisiwe, ubukhulu buvela ekushiseni okuphezulu.
Isikhathi sokuthumela: Feb-24-2023