Amaphethini okugqwala ezinsimbi ngokuvamile angahlukaniswa abe izigaba ezimbili: ukugqwala okuphelele kanye nokugqwala kwendawo.Futhi ukugqwala kwasendaweni kungahlukaniswa kube: ukugqwala komgodi, ukugqwala kokuqhekeka, ukugqwala kokuhlangana kwe-galvanic, ukugqwala kwe-intergranular, ukugqwala okukhethekile, ukugqwala kwengcindezi, ukugqwala kokukhathala nokugqwala.
Ukugqwala okuphelele kubonakala ngokugqwala kuhlukaniswe ngokulinganayo ebusweni bensimbi, ukuze insimbi ibe ncane kakhulu.Ukugqwala okuphelele kwenzeka ngaphansi kwesimo sokuthi indawo edlayo ingafinyelela kuzo zonke izingxenye zensimbi ngokulinganayo, futhi ukwakheka nokuhleleka kwensimbi kufana ngokuqhathaniswa.
I-Pitting corrosion, eyaziwa nangokuthi imbobo encane, iwuhlobo lokugqwala olugxiliswe endaweni encane kakhulu yensimbi futhi lujule kuphethini yensimbi yangaphakathi efana nokugqwala.
Izimo zokugqwala kwe-pitting ngokuvamile zihlangabezana nezimo ezibonakalayo, eziphakathi nendawo kanye nezimo ze-electrochemical:
1, ukubhoboza ngokuvamile kwenzeka lapho kudlula kalula indawo yensimbi (njengensimbi engagqwali, i-aluminium) noma ngaphezulu kwensimbi ene-cathodic plating.
2, ukugoba kwenzeka phambi kwama-ion akhethekile, njengama-halogen ions phakathi nendawo.
3, ukugqwala kwe-pitting kwenzeka kumandla athile abalulekile ngenhla, abizwa ngokuthi amandla omgodi noma amandla okuqhekeka.
I-Intergranular corrosion iyinto yensimbi endaweni ethile eyenza ukugqwala eduze kwemingcele yezinto ezisanhlamvu noma imingcele yokusanhlamvu eduze nokugqwala, ukuze ulahlekelwe yisibopho phakathi kwezinhlamvu zesenzakalo sokugqwala.
Ukugqwala okukhethiwe kubhekisela ezingxenyeni ezisebenza kakhulu kuma-alloys amaningi ancibilike ngokukhethayo, le nqubo ibangelwa umehluko we-electrochemical ezingxenyeni ze-alloy.
I-Crevice corrosion ubukhona be-electrolyte phakathi kwensimbi nensimbi kanye nensimbi futhi okungezona ezensimbi kwakha igebe elincane, ukufuduka kwendawo ephakathi kuyavinjwa lapho isimo sokugqwala sendawo.
Ukwakhiwa kokugqwala kwe-crevice:
1, ukuxhumana phakathi kwezingxenye ezihlukene zesakhiwo.
2, endaweni yensimbi yamadiphozithi, okunamathiselwe, okokunamathela neminye imikhiqizo yokugqwala kukhona.
Isikhathi sokuthumela: Mar-15-2024