Cov cua kub sib txawv tau siv dav hauv kev lag luam roj av refining, thiab lawv qhov tseem ceeb yog tus kheej - pom tseeb. Kev siv hluav taws xob ntawm cov khoom siv hluav taws xob sib pauv ncaj qha cuam tshuam rau tag nrho cov txiaj ntsig ntawm cov txheej txheem refining nrog rau cov nqi ua haujlwm. Cov ntaub ntawv txheeb xyuas qhia tias cov khoom siv hluav taws xob sib pauv rau kwv yees li ib - tsib feem pua ntawm tag nrho cov peev txheej hauv cov phiaj xwm cog tshuaj. Yog li ntawd, kev siv kev ua tau zoo thiab kev pabcuam lub neej ntawm cov khoom siv hluav taws xob sib txawv yog cov ntsiab lus tseem ceeb uas tsim nyog hauv - kev tshawb nrhiav tob. Kev soj ntsuam ntawm qhov ua rau ntawm cov cua kub exchanger tsis ua hauj lwm qhia tau hais tias corrosion yog thawj culprit; Tseeb tiag, corrosion nyob rau hauv tshav kub exchangers yog ib tug dav thiab pervasive teeb meem. Kev daws qhov teeb meem zoo ntawm corrosion yog, yog li ntawd, tantamount los hais txog cov hauv paus ntsiab lus ntawm kev siv hluav taws xob tsis ua haujlwm.
Corrosion Inhibitors: Corrosion inhibitors raws li cov chromates feem ntau yog ua haujlwm hauv cov dej txias. Lub chromate ion ua raws li anodic (txheej txheem) inhibitor; Thaum ua ke nrog cov cathodic inhibitors tsim nyog, nws ua rau muaj kev tiv thaiv corrosion uas yog ob qho tib si txaus siab thiab muaj txiaj ntsig zoo.
Chromate-Zinc-Polyphosphate: Polyphosphates yog siv rau lawv lub peev xwm los ntxuav cov hlau nto thiab rau lawv qhov muaj zog corrosion-inhibiting zog. Polyphosphates tuaj yeem dhau los ua ib feem ntawm hydrolysis los tsim orthophosphates, uas, dhau los, tuaj yeem cuam tshuam nrog calcium ions los tsim cov colloidal cations loj, yog li inhibiting cov txheej txheem cathodic.
Chromate-Zinc-Phosphonate: Txoj kev no zoo ib yam li cov lus hais saum toj no, tshwj tsis yog tias sodium phosphonate hloov pauv rau polyphosphate. Aminomethylene phosphonates tshwj xeeb tshaj yog haum rau cov ntawv thov uas muaj pH qib siab dua li cov feem ntau tau sau rau polyphosphate-raws li systems. Aminomethylene phosphonates zoo tiv thaiv kev tsim cov nplai thiab tuaj yeem tswj cov nag lossis daus ntawm calcium ntsev, txawm tias pH qib siab txog 9.
Chromate-Zinc-Hydrolyzed Polyacrylamide: Qhov system no siv cov kev ua haujlwm ntawm hydrolyzed polyacrylamide-a cationic copolymer- los tiv thaiv lossis inhibit qhov tsim ntawm nplai thiab fouling deposits.
Kev Tiv Thaiv Electrochemical: Txoj hauv kev no suav nrog kev siv ob qho tib si kev tiv thaiv cathodic thiab anodic tiv thaiv cov txheej txheem. Kev tiv thaiv Cathodic entails siv lub zog DC sab nraud los ua cov hlau nto ntawm cov khoom siv cathode, yog li ua tiav kev tiv thaiv. Txawm li cas los xij, txoj kev no yog tus cwj pwm los ntawm kev siv hluav taws xob siab thiab cov nqi ua haujlwm tseem ceeb. Kev tiv thaiv Anodic, hloov pauv, koom nrog kev sib txuas ntawm cov khoom siv hluav taws xob uas xav tau kev tiv thaiv rau lub anode ntawm ib qho hluav taws xob sab nraud; Cov txheej txheem no induces tsim ib tug passive zaj duab xis ntawm hlau nto, yog li muab kev tiv thaiv corrosion.
