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Ityhubhu echanekileyo: ukwazisa ngokufutshane kwetyhubhu echanekileyo

Ukuba umbhobho wensimbi oqhelekileyo ukhethiweyo, kuya kuba nephutha elikhulu phakathi kombhobho wensimbi omiselweyo kunye nombhobho wensimbi ofunyenweyo.Kwakwiindawo ezahlukeneyo zombhobho wensimbi, ububanzi bangaphakathi okanye ubuninzi bodonga buya kuhluka kakhulu.Kodwa iityhubhu ezichanekileyo zahlukile.Olu hlobo lombhobho wensimbi luneemfuno ezingqongqo kakhulu kuyo nayiphi na inxalenye yombhobho.Nangona kungenakwenzeka ukusebenzisa umbhobho ochanekileyo, yonke imilinganiselo yepayipi yensimbi ihlangabezana ngokupheleleyo nomgangatho.Nangona kunjalo, ityhubhu echanekileyo inokulawula impazamo kuluhlu oluncinci kakhulu.Ngokuqhelekileyo, le mpazamo ayiyi kudlula iiyunithi ezimbini eziqhelekileyo, ezaneleyo kumashishini amaninzi.

Njengoko sonke siyazi, ukuba umbhobho wensimbi ubekwe kwindawo evulekileyo ixesha elide okanye kukho nayiphi na ingxabano, i-oxide layer phezu komhlaba wensimbi engenasici iya konakaliswa, kwaye emva koko iya kuba yi-oxidized kwaye igruthwe emoyeni omanzi. .Ngoko ke, umbhobho wensimbi kufuneka ubekwe kwindawo evaliweyo kangangoko kunokwenzeka.Nangona kunjalo, ityhubhu echanekileyo ineenzuzo ezizodwa, kuba umphezulu wayo akulula ukuba i-oxidized, ehambelana ngokusondeleyo nezinto eziluhlaza zetyhubhu echanekileyo.

Ityhubhu echanekileyo ixhomekeke kwifilimu enqabileyo kakhulu, eqinileyo, eshinyeneyo kwaye ezinzileyo yechromium ecebileyo ye-oxide (ifilimu ekhuselayo) eyenziwe phezu komhlaba ukukhusela iiathomu ze-oksijini ukuba zingene kwaye zifake i-oxidizing ngokuqhubekayo, ukuze kufumaneke amandla okulwa nokubola.Ityhubhu yentsimbi echanekileyo ibonisa ukuba ukuxhathisa kwe-corrosion yefilimu yenguqu buthathaka ngenxa yokusabela okuzithandayo, okuya kwenza i-pitting corrosion reaction, ivelise i-pores, yenze ulwelo oluqinileyo lwe-corrosion kunye ne-ion ye-chloride ekufutshane, kunye nokukhawulezisa izinga lokutya. .Ukongeza, i-intergranular corrosion cracks kwintsimbi engenasici iya kutshabalalisa ifilimu yenguqu kumphezulu weplate yensimbi engenasici.Ngoko ke, iqondo elithile lokucoca kunye nokugcinwa kufuneka liqhutywe phezu kombhobho wensimbi ngokuchanekileyo ukwandisa ngcono ubomi benkonzo yombhobho ochanekileyo.


Ixesha lokuposa: Jan-15-2021