Umahluko phakathi kwe-phosphating kunye nonyango lwe-passivation kwisinyithi ulele kwiinjongo zabo kunye neendlela.

I-Phosphating yindlela ebalulekileyo yokuthintela ukubola kwizinto zetsimbi.Iinjongo zayo ziquka ukubonelela ngokukhuselwa kwe-corrosion kwisiseko sesinyithi, ukukhonza njenge-primer ngaphambi kokupenda, ukuphucula ukunamathela kunye nokuxhatshazwa kwe-corrosion ye-coating layers, kunye nokusebenza njenge-lubricant kwi-processing metal.I-Phosphating ingahlelwa kwiintlobo ezintathu ngokusekelwe kwizicelo zayo: 1) i-coating phosphating, i-2) i-extrusion lubrication lubrication phosphating ebandayo, kunye ne-3) i-phosphating yokuhlobisa.Isenokwahlulwa ngokodidi lwephosphate esetyenziswayo, efana ne-zinc phosphate, i-zinc-calcium phosphate, i-iron phosphate, i-zinc-manganese phosphate, kunye ne-manganese phosphate.Ukongeza, i-phosphating inokuhlelwa ngobushushu: ubushushu obuphezulu (ngaphezulu kwe-80 ℃) i-phosphating, ubushushu obuphakathi (50-70 ℃) i-phosphating, ubushushu obuphantsi (malunga ne-40 ℃) i-phosphating, kunye nobushushu begumbi (10-30 ℃) iphosphating.

Kwelinye icala, i-passivation yenzeke njani kwisinyithi, kwaye yintoni indlela yayo?Kubalulekile ukuba uqaphele ukuba i-passivation yinto ebangelwa ukusebenzisana phakathi kwesigaba sesinyithi kunye nesigaba sesisombululo okanye nge-interfacial phenomena.Uphando lubonise impembelelo yokukrala koomatshini kwiintsimbi kwimeko egqithisiweyo.Iimvavanyo zibonisa ukuba i-abrasion eqhubekayo ye-metal surface ibangela utshintsho olubi kakhulu kwi-metal potential, isebenze isinyithi kwisimo sokudlula.Oku kubonisa ukuba i-passivation yinto edibanisa ubuso eyenzeka xa isinyithi sidibana nento ephakathi phantsi kweemeko ezithile.I-Electrochemical passivation iyenzeka ngexesha le-anodic polarization, ekhokelela ekutshintsheni kwisakhono setsimbi kunye nokwakhiwa kwee-oxide zetsimbi okanye iityuwa kumphezulu we-electrode, ukudala ifilimu ye-passive kunye nokubangela i-metal passivation.I-Chemical passivation, kwelinye icala, ibandakanya isenzo esithe ngqo se-oxidizing agents ezifana ne-HNO3 egxininiswe kwintsimbi, ukwenza ifilimu ye-oxide phezu komhlaba, okanye ukongezwa kweentsimbi ezidlulayo ngokulula ezifana ne-Cr kunye ne-Ni.Kwi-chemical passivation, i-concentration ye-agent e-oxidizing eyongezelelweyo akufanele iwele ngaphantsi kwexabiso elibalulekileyo;ngaphandle koko, ayinakubangela i-passivation kwaye inokukhokelela ekunyibilikeni kwesinyithi ngokukhawuleza.