Qhov xav tau rau pickling stainless hlau tshwm sim thaum nws tsim nyog los tiv thaiv nto ntawm txheej txheem corrosion. Raws li cov txheej txheem etching, cov hlau tsis muaj zog thiab cov nplai raug tshem tawm tau los ntawm cov hlau saum npoo thiab chromium oxide zaj duab xis yog tsim. Kev xaiv kom zoo yuav ua rau lub neej ntev ntawm koj cov khoom lag luam steel hlau.
Txoj kev pheej hmoo ntawm kev txhim kho corrosion ntawm stainless hlau feem ntau tshwm sim tom qab vuam los yog tom qab kev siv tshuab ntawm cov ntu (cov cuab yeej emery, sandblasting, thiab lwm yam). Lub ntsiab lus ntawm kev puas tsuaj tau txais los ntawm cov hlau nyob hauv kev ua txhaum ntawm chromium oxide txheej, vim tias cov hlau ua rau "raug" thiab ua rau tsis muaj kev tiv thaiv. Yog li ntawd, txhua qhov kev cuam tshuam ntawm cov xeb hlau yuav tsum yog "nruab nrab" los ntawm passivation, tshuaj etching.
Acid pickling
Kev siv cov tshuaj uas muaj zog ntau txhais tau hais tias kev ua haujlwm yog nqa tawm hauv chav tshwj xeeb. Nyob rau thawj theem, cov txheej txheem ntawm kev yaig ntawm nplai yog txhim tsa hauv cov txheej txheem da dej nrog sulfuric (7-8% ntawm qhov ntim) thiab hydrochloric (3-4%) acid. Cov txheej txheem yuav tsum tau nqa tawm ntawm qhov kub ntawm + 60-80 C rau 30-40 feeb. Thaum lub sij hawm ua ntej, nws yog ib qho tsim nyog los saib xyuas qhov tsis sib haum ntawm qhov kub. Tom qab ntawd cov khoom yog ntxuav kom huv nrog dej.
Ntawm theem ob, cov khoom ntxuav tau muab raus rau hauv kev sib xyaw ntawm hydrofluoric acid (1-2% los ntawm qhov hnyav) thiab nitric (15-20% kuj los ntawm qhov hnyav). Thaum kawg, yaug nrog dej yog qhov yuav tsum tau. Cov txheej txheem tag nrho yog nrog los ntawm kev tso tawm ntau vapors, uas qhia tau tias yuav tsum siv cov khoom tiv thaiv rau cov tawv nqaij thiab cov pa ua pa. Acid etching tuaj yeem nrog cov xaim xoos xaim hluav taws xob, uas ua rau kom muaj txiaj ntsig ntawm cov txheej txheem. Hauv qhov no, hluav taws xob hluav taws xob dhau los ntawm kev sib xyaw ntawm cov kua qaub rau hauv da dej, nrog cov hlau tau raug kho ua si lub luag haujlwm ntawm lub anode lossis cathode.
Etching nrog kua qaub npaj-ua
Tsis yog txhua lub chaw tsim khoom muaj lub siab xav ua kua qaub acid pickling thaj tsam. Yog li, ntau tus neeg siv cov ntawv ua kua nyeem npaj, tshuaj txau, muab tshuaj ntsuab, mloog zoo, uas tuaj yeem muaj txog 4 hom kua qaub. Txhawm rau siv rau saum npoo, cov kua qaub tiv thaiv cov tshuaj txhuam thiab cov tshuaj tsuag tshwj xeeb yog siv. Yog tias nws yuav tsum ua cov txheej txheem rau welded seams, tom qab ntawd nws yog qhov zoo tshaj plaws los siv cov tshuaj txhuam nrog lub tuab tuab - nws qhov kev ua haujlwm pickling twb tau tshaj tawm ntawm qhov kub ntawm + 10 ° C.
Ua ntej pib kev kho, cov khoom yog ntxuav ntawm xeb, roj, av. Txhawm rau ua qhov no, cov tshuaj ntxuav tshwj xeeb tuaj yeem siv rau saum npoo, uas yuav tsum ceev cia 30 feeb. Yog tias cov gels, pastes siv, tom qab ntawd lawv yuav tsum tau siv rau cov nqaws nrog cov tuav ntawm 20 cm ntawm ob sab. Lub sijhawm tiv thaiv muaj li 20-90 feeb (ua raws li cov lus qhia rau kev siv). Tom qab yaug, ib qho passivator tau thov rau cov khoom lag luam, uas ua rau thaj yeeb yaj kiab chromium oxide ruaj khov. Lub sij hawm tuav ntawm passivator yog 30-60 feeb.
