Vim yog qhov tshwj xeeb ntawm lawv cov kev siv, kev tiv thaiv corrosion yog ib qho tseem ceeb ntawm lub plhaub - thiab - tube heat exchanger tu. Kev xaiv tsim nyog ntawm kev tiv thaiv corrosion yog qhov tseem ceeb rau kev ua tiav cov khoom siv uas xav tau. Cov txheej txheem tiv thaiv corrosion hauv qab no yog npaj rau cov xwm txheej cuam tshuam: corrosion inhibitors thiab electrochemical tiv thaiv. Yuav ua li cas lub plhaub - thiab - raj kub exchangers yuav tsum tau khaws cia thiab tiv thaiv corrosion nyob rau hauv daim ntawv thov niaj hnub? Cov ntsiab lus hauv qab no tau sau tseg:
1. Corrosion Inhibitors: Corrosion inhibitors nrog chromate yog cov khoom tseem ceeb uas feem ntau siv hauv cov dej txias. Chromate ions yog ib qho anodic (process) inhibitor. Thaum ua ke nrog ib qho tsim nyog cathodic inhibitor, lawv tuaj yeem ua tiav kev tiv thaiv corrosion thiab kev lag luam.
(1) Chromate-Zinc-Polyphosphate: Polyphosphate yog siv vim nws ntxuav cov hlau thiab muaj corrosion-inhibiting peev xwm. Polyphosphate tuaj yeem hloov pauv mus rau orthophosphate, thiab lawv tuaj yeem cuam tshuam nrog calcium los tsim cov colloidal cations loj, inhibiting cov txheej txheem cathodic. (2) Chromate-Zinc-Phosphonate: Zoo ib yam li txoj kev dhau los, txoj kev no siv sodium phosphonate es tsis yog polyphosphate. Aminomethylimide phosphate kuj tseem siv tau rau hauv cov xwm txheej uas tus nqi pH siab dua li qhov tau teev tseg rau polyphosphate. Aminomethylimide phosphonates tuaj yeem tiv thaiv kev tsim cov nplai thiab tswj cov calcium ntsev los nag txawm nyob ntawm pH 9.
(3) Chromate-Zinc-Hydrolyzed Polyacrylamide: Vim muaj cov nyhuv dispersing ntawm hydrolyzed polyacrylamide, cationic copolymer, scale tsim tuaj yeem tiv thaiv lossis inhibited.
2. Electrochemical tiv thaiv siv cathodic tiv thaiv thiab anodic tiv thaiv. Kev tiv thaiv Cathodic siv lub zog DC sab nraud los ua kom cov hlau nto cathode rau kev tiv thaiv; txoj kev no siv hluav taws xob ntau thiab kim heev. Kev tiv thaiv Anodic txuas lub plhaub - thiab - raj kub exchanger mus rau lub anode ntawm ib tug sab nraud fais fab mov, ua rau ib tug passivation zaj duab xis rau ntawm hlau nto, yog li muab kev tiv thaiv.