Phosphating yog ib txoj hauv kev tseem ceeb rau kev tiv thaiv corrosion hauv cov ntaub ntawv hlau.Nws lub hom phiaj muaj xws li muab kev tiv thaiv corrosion rau lub hauv paus hlau, ua cov primer ua ntej pleev xim, txhim kho cov adhesion thiab corrosion kuj ntawm txheej txheej, thiab ua raws li cov roj nplua nyeem hauv kev ua hlau.Phosphating tuaj yeem muab faib ua peb hom raws li nws daim ntawv thov: 1) txheej phosphating, 2) txias extrusion lubrication phosphating, thiab 3) hniav phosphating.Nws tuaj yeem raug cais los ntawm hom phosphate siv, xws li zinc phosphate, zinc-calcium phosphate, hlau phosphate, zinc-manganese phosphate, thiab manganese phosphate.Tsis tas li ntawd, phosphating tuaj yeem raug cais raws li qhov kub thiab txias: kub-kub (txog 80 ℃) phosphating, nruab nrab-kub (50-70 ℃) phosphating, qis-kub (ib ncig 40 ℃) phosphating, thiab chav tsev kub (10-30 ℃) phosphating.
Ntawm qhov tod tes, passivation tshwm sim hauv cov hlau li cas, thiab nws cov txheej txheem yog dab tsi?Nws yog ib qho tseem ceeb uas yuav tsum nco ntsoov tias passivation yog ib qho tshwm sim los ntawm kev sib cuam tshuam ntawm theem hlau thiab theem kev daws teeb meem lossis los ntawm qhov tshwm sim ntawm kev sib tshuam.Kev tshawb fawb tau qhia txog qhov cuam tshuam ntawm kev ua kom puas tsuaj rau cov hlau hauv lub xeev passivated.Cov kev sim qhia tau hais tias kev puas tsuaj tas mus li ntawm cov hlau nto ua rau muaj kev cuam tshuam tsis zoo hauv cov hlau muaj peev xwm, ua kom cov hlau ua rau lub xeev passivated.Qhov no qhia tau hais tias passivation yog qhov tshwm sim ntawm qhov sib cuam tshuam tshwm sim thaum cov hlau nkag mus rau hauv qhov nruab nrab hauv qee yam mob.Electrochemical passivation tshwm sim thaum lub sij hawm anodic polarization, ua rau kev hloov pauv ntawm cov hlau muaj peev xwm thiab tsim cov hlau oxides los yog ntsev rau ntawm electrode nto, tsim ib zaj duab xis passive thiab ua rau hlau passivation.Chemical passivation, ntawm qhov tod tes, koom nrog kev ua haujlwm ncaj qha ntawm cov neeg ua haujlwm oxidizing xws li concentrated HNO3 ntawm cov hlau, tsim cov oxide zaj duab xis rau saum npoo, lossis ntxiv cov hlau yooj yim passivatable xws li Cr thiab Ni.Nyob rau hauv chemical passivation, lub concentration ntawm ntxiv oxidizing tus neeg sawv cev yuav tsum tsis txhob poob qis dua tus nqi tseem ceeb;txwv tsis pub, nws yuav tsis induce passivation thiab yuav ua rau kom ceev hlau dissolution.
Post lub sij hawm: Jan-25-2024