1 Accelerated Electrochemical Reaction Kinetics
Qhov kub thiab txias yog qhov tseem ceeb cuam tshuam rau electrochemical corrosion tus nqi. Raws li kinetic hauv paus ntsiab lus, txhua txhua 10℃nce nyob rau hauv qhov kub thiab txias kwv yees li ob npaug ntawm cov tshuaj tiv thaiv ntawm ntau cov txheej txheem corrosion.
Kev kub siab dua txhawb kev nthuav tawm sai ntawm cov tshuaj chloride ions, yaj cov pa oxygen, thiab lwm yam kev txhoj puab heev hauv dej hiav txwv, ua kom cov anodic dissolution thiab cathodic txo cov tshuaj tiv thaiv ntawm cov hlau nplaum.
Tag nrho cov niaj hnub corrosion tus nqi nce noticeably. Txawm hais tias Monel 400 tseem muaj kev tiv thaiv corrosion zoo dua li cov pa roj carbon steel thiab cov khoom siv tooj liab, nws qhov tsis muaj corrosion kuj nce nrog kub.
2 Destabilization thiab degradation ntawm Passive zaj duab xis
Cov zaj duab xis tiv thaiv passive ntawm Monel 400 yog thermally rhiab heev.
Qhov kub siab ua kom tsis muaj zog adhesion thiab kev ncaj ncees ntawm oxide zaj duab xis. Cov yeeb yaj kiab tuaj yeem dhau los ua ntxeem tau, tawg, lossis qee qhov sib cais, poob nws qhov cuam tshuam.
Chloride ions nyob rau hauv qhov kub thiab txias yog feem ntau yuav nkag mus rau qhov tsis xws luag passive zaj duab xis, ua rau lub zos corrosion xws li pitting thiab crevice corrosion. Nyob rau hauv qhov kub thiab txias seawater nrog crevices, deposits, los yog marine fouling, localized corrosion yuav hnyav dua.
Tsis zoo li qee cov alloys uas muaj corrosion-resistant zoo li titanium thiab high-alloy stainless hlau, Monel 400 tsis tsim ib txheej thermally ruaj khov heev, ua rau nws cov yeeb yaj kiab muaj kev cuam tshuam ntau dua ntawm qhov kub siab.
3 Muaj kev pheej hmoo ntawm Kev Nyuaj Siab Corrosion Cracking (SCC)
Monel 400 feem ntau resistant rau chloride kev nyuaj siab corrosion tawg nyob rau hauv chav tsev kub, tab sis qhov kev ua tau zoo tsis muaj zog heev nyob rau hauv high-temperature seawater.
Cov kub kub txhim khu kev ua haujlwm ntawm cov kev ntxhov siab uas seem los ntawm kev ua haujlwm txias, vuam, lossis kev sib dhos.
Ua ke nrog cov tshuaj chloride ions thiab kub siab, qhov tseem ceeb ntawm kev ntxhov siab rau SCC txo. Cheebtsam nrog residual tensile kev nyuaj siab yog feem ntau ua rau intergranular los yog transgranular cracking, tshwj xeeb tshaj yog nyob rau hauv welded pob qij txha, tshav kub-cuam tshuam cheeb tsam, thiab txias-ua hauj lwm qhov chaw.
4 Accelerated Erosion-Corrosion nyob rau hauv Flowing High-temperature Seawater
Nyob rau hauv dynamic high-temperature seawater, tshwj xeeb tshaj yog nrog cov xuab zeb, silt, los yog lwm yam khoom hais, qhov sib xyaw ua ke ntawm qhov kub thiab txias yog qhov muaj kev phom sij ntau dua.
Qhov kub thiab txias ua kom cov zaj duab xis soluble, thaum ntws thiab particle cuam tshuam tsis tu ncua strip lub tshiab tsim passive zaj duab xis.
Qhov sib xyaw ua ke ntawm kev yaig thiab corrosion ua rau cov khoom poob ntau dua li qhov kub thiab txias zoo li qub. Kev tiv thaiv corrosion ntawm Monel 400 degrades ntau pom tseeb nyob rau hauv high-ceev, high-temperature seawater kev pab cuam.
