Insimbi engagqwali ayikona ukugqwala, kodwa akulula ukugqwala. Ngaphansi kwezinye izimo, insimbi engagqwali nayo izogqwala. Ingaphezulu lensimbi engagqwali inefilimu encane kakhulu, ezacile futhi ezinzile ye-chromium ecebile ye-oxide, ukugqwala kwensimbi engagqwali, ngale filimu ye-oxide ukuvimbela ukungena kwama-athomu omoya-mpilo ukusabela kwe-oxidation nokugqwala. Eqinisweni, ezinye izinsimbi ezingenasici zinakho kokubili ukumelana nokugqwala kanye nokumelana ne-asidi (ukumelana nokugqwala). Ukumelana nokugqwala nokugqwala kwensimbi engagqwali kungenxa yokwakheka kwefilimu ye-oxide ecebile nge-chromium (ifilimu ye-passivation) ebusweni bayo, ehlukanisa insimbi endaweni yangaphandle, ivimbela insimbi ukuthi ingagqwali futhi, futhi inamandla zilungise. Uma ilimele, i-chromium esensimbi izophinda ikhiqize ifilimu ye-passivation enomoya-mpilo ophakathi nendawo futhi iqhubeke idlala indima yokuvikela. Lapho ifilimu ye-oxide ilimele, igqwala kalula.
1) Imvelo yensimbi engagqwali inomswakama, esimweni samanzi nomoya-mpilo, ukwakheka kwe-asidi ephilayo kanye nokulimala kokuguguleka ebusweni bensimbi engagqwali.
2) Imikhiqizo yensimbi engagqwali yonakaliswa ngokuzenzakalelayo ngamathuluzi okufaka bese ilimaza ifilimu yokuvikela engaphezulu. Isibonelo, uma amabhawodi ensimbi engenasici efakwa kunjiniyela odongeni lwamakhethini wangaphandle, isikrufu sidala ukulimala komshini endaweni lapho ikhanda lebhawudi lihlangana khona. Ngemuva kokugeza imvula, ikhanda lamabhawodi ensimbi lizovela ukugqwala okuncane okuntantayo.
3) Kukhona ukungcola kothuli noma izinhlayiya zensimbi ebusweni bensimbi engagqwali, okulula ukusabela nge-electrochemical ngensimbi engagqwali emoyeni oswakeme ukusheshisa ukugqwala kwensimbi engagqwali.
4) Indawo yensimbi engagqwali echayeke ku-asidi, i-alkali, usawoti kanye nezinye izinto ijwayele ukugqwala ukusabela kwamakhemikhali. Isibonelo, izibophelelo zokuxhuma odongeni lwamakhethini emadolobheni asogwini ngokuvamile zikhethelwa imikhiqizo yensimbi engagqwali engu-316 (imelana nokugqwala kakhulu kunensimbi engagqwali engu-304), ngoba okuqukethwe kukasawoti omningi emoyeni emadolobheni asogwini kulula ukubangela ukugqwala kunsimbi engagqwali.
Ngakho-ke, ukuze wenze imikhiqizo yensimbi engagqwali ihlale ikhanya futhi ingagqwali, kuyadingeka ukukhetha impahla efanele yemikhiqizo yensimbi engagqwali, okulandelwa ukuhlanza nokugcina imikhiqizo yensimbi engagqwali, ukususa ukungcola okungaphezulu ukuze kugwenywe ukusabela nokugqwala.
Isikhathi sokuthumela: Aug-19-2022