Muaj cov txheej txheem siv tshuab, tshuaj, thiab electrochemical los tshem tawm cov oxide nplai ntawm cov kav dej tsis huv stainless hlau.

Vim yog qhov nyuaj ntawm oxide nplai muaj pes tsawg leeg ntawm cov kav dej tsis huv stainless hlau, nws tsis yooj yim rau tshem tawm cov nplai oxide rau ntawm qhov chaw, tab sis kuj ua rau qhov chaw siab mus rau qib siab ntawm kev huv thiab du.Kev tshem tawm ntawm oxide nplai ntawm cov kav dej huv stainless hlau feem ntau siv ob kauj ruam, ib qho yog pretreatment, thiab theem ob yog tshem cov tshauv thiab slag.

Lub oxide scale pretreatment ntawm huv stainless hlau yeeb nkab ua rau oxide nplai poob, thiab ces nws yog ib qho yooj yim mus tshem tawm los ntawm pickling.Pretreatment tuaj yeem muab faib ua cov hauv qab no: alkaline nitrate melting txoj kev kho.Alkaline yaj muaj 87% hydroxide thiab 13% nitrate.Qhov piv ntawm ob qho tib si hauv cov ntsev molten yuav tsum tau ua tib zoo tswj kom cov ntsev molten muaj lub zog oxidizing zoo tshaj plaws, melting point, thiab yam tsawg kawg nkaus viscosity.Hauv kev tsim khoom, tsuas yog cov ntsiab lus sodium nitrate tsis tsawg dua 8% (wt).Kev kho mob yog nqa tawm nyob rau hauv ib lub qhov cub ntsev da dej, qhov kub ntawm 450 ~ 470℃, thiab lub sijhawm yog 5 feeb rau ferritic stainless hlau thiab 30 feeb rau austenitic stainless hlau.Ib yam li ntawd, hlau oxides thiab spinels tseem tuaj yeem oxidized los ntawm nitrates thiab poob trivalent hlau oxides, uas yooj yim tshem tawm los ntawm pickling.Vim muaj qhov kub thiab txias, cov oxides uas tshwm sim yog ib feem tev tawm thiab tso rau hauv da dej hauv daim ntawv sludge.Hauv qab ntawm lub qhov cub.

Alkaline nitrate melting pretreatment txheej txheem: chav degreasing→preheating (150 ~ 250℃20 ~ 30 feeb)→molten ntsev kho→dej quenching→ntxuav dej kub.Molten ntsev kev kho mob tsis haum rau cov rooj sib txoos nrog cov khoob khoob khoob los yog crimping.Thaum cov khoom raug tshem tawm ntawm lub qhov cub ntsev ntsev thiab dej quenched, pungent alkali thiab ntsev pos huab yuav raug txaws, yog li qhov sib sib zog nqus don hom yuav tsum tau saws rau dej quenching.Splash-proof dej quenching tank.Thaum dej quenching, ua ntej nqa cov khoom pob tawb rau hauv lub tank, nres saum toj ntawm kab rov tav, kaw lub tank npog, thiab tom qab ntawd txo qis cov pob tawb rau hauv dej kom txog thaum nws nkag mus.

Alkaline potassium permanganate pretreatment: cov kev kho mob muaj sodium hydroxide 100→125g / L, sodium carbonate 100→125g / L, poov tshuaj permanganate 50g / L, tov kub 95 ~ 105℃, kev kho lub sijhawm 2 ~ 4 teev.Txawm hais tias kev kho alkaline potassium permanganate tsis zoo li kev kho ntsev ntsev, nws qhov zoo dua yog tias nws tsim nyog rau cov rooj sib txoos nrog welded seams lossis crimping.

Txhawm rau loosen cov nplai oxide, cov kua qaub hauv qab no tau ncaj qha rau kev kho los ntawm txoj kev dipping.

Txhawm rau tiv thaiv cov kua qaub los ntawm kev ua kom lub hauv paus hlau, lub sij hawm immersion thiab acid kub yuav tsum tau ua tib zoo tswj.