Umehluko phakathi kokwelashwa kwe-phosphating kanye ne-passivation ezinsimbi usezinjongo zazo kanye nezindlela.

I-Phosphating iyindlela ebalulekile yokuvimbela ukugqwala ezintweni zensimbi.Izinjongo zayo zihlanganisa ukuhlinzeka ngokuvikela ukugqwala kwesisekelo sensimbi, ukusebenza njengesiqalo ngaphambi kokudweba, ukuthuthukisa ukunamathela nokugqwala kokumelana nezingqimba zokumboza, nokusebenza njengento yokugcoba ekucutshungulweni kwensimbi.I-Phosphating ingahlukaniswa ngezinhlobo ezintathu ngokusekelwe ekusetshenzisweni kwayo: 1) i-coating phosphating, 2) i-cold extrusion lubrication phosphating, kanye 3) ne-phosphating yokuhlobisa.Ingase futhi ihlukaniswe ngohlobo lwe-phosphate esetshenziswayo, njenge-zinc phosphate, i-zinc-calcium phosphate, i-iron phosphate, i-zinc-manganese phosphate, ne-manganese phosphate.Ukwengeza, i-phosphating ingahlukaniswa ngokwezinga lokushisa: izinga lokushisa eliphezulu (ngaphezulu kuka-80 ℃) iphosphating, izinga lokushisa eliphakathi nendawo (50–70 ℃) phosphating, izinga lokushisa eliphansi (cishe 40 ℃) phosphating, kanye nezinga lokushisa legumbi (10–30 ℃) i-phosphating.

Ngakolunye uhlangothi, i-passivation ivela kanjani ezinsimbi, futhi iyiphi indlela yayo?Kubalulekile ukuqaphela ukuthi i-passivation yinto ebangelwa ukusebenzisana phakathi kwesigaba sensimbi nesigaba sesixazululo noma izenzakalo ezihlangene.Ucwaningo lubonise umthelela wokuhuzuka komshini ezinsimbi esimweni esingashintshiwe.Ukuhlola kubonisa ukuthi ukuhuzuka okuqhubekayo kwendawo yensimbi kubangela ushintsho olubi oluphawulekayo emandleni ensimbi, lwenza insimbi isebenze esimweni esingashintshiwe.Lokhu kubonisa ukuthi i-passivation yinto ehlangene yobuso eyenzeka lapho izinsimbi zihlangana nento ephakathi ngaphansi kwezimo ezithile.I-Electrochemical passivation kwenzeka ngesikhathi se-anodic polarization, okuholela ekushintsheni kwamandla ensimbi kanye nokwakheka kwama-oxide ensimbi noma usawoti endaweni ye-electrode, okwenza ifilimu ye-passive futhi ibangele i-metal passivation.I-Chemical passivation, ngakolunye uhlangothi, ihilela isenzo esiqondile sama-oxidizing agents afana ne-HNO3 egxilile ensimbi, ukwakha ifilimu ye-oxide ebusweni, noma ukufakwa kwezinsimbi ezidlula kalula ezifana ne-Cr ne-Ni.Ekwenzeni amakhemikhali, ukugxila kwe-ejenti eyengeziwe ye-oxidizing akufanele kwehle ngaphansi kwenani elibalulekile;ngaphandle kwalokho, kungase kungenzi i-passivation futhi kungaholela ekuhlakazweni kwensimbi ngokushesha.