Nyob rau hauv lub cheeb tsam ntawm kev kho deg rau hlau, passivation stands raws li ib tug tseem ceeb txheej txheem uas ua raws li ib tug tsis pom kev ntaub thaiv npog, tiv thaiv hlau tiv thaiv sab nraud corrosion thiab ncua lawv lifespan ho. Tshwj xeeb tshaj yog rau cov titanium alloys, cov txheej txheem no tuav qhov tseem ceeb tshaj plaws vim lawv lub teeb yuag, siab zog, thiab corrosion-resistant zog, ua rau lawv zoo tshaj hauv aerospace, kev kho mob, tshuaj, thiab ntau yam hauj lwm. Passivation ntawm titanium alloys ua ib qho kev lees paub tseem ceeb rau lawv qhov kev ua tau zoo tshwj xeeb.
Electrochemical Passivation
Electrochemical passivation entails inducing tsim ib tug ntom thiab ruaj khov oxide zaj duab xis nyob rau saum npoo ntawm titanium alloys los ntawm daim ntawv thov ntawm hluav taws xob tam sim no. Ntawm ntau txoj kev, cov txheej txheem anodizing garners tseem ceeb heev. Los ntawm muab cov titanium alloys ua anodes hauv cov tshuaj electrolytic thiab siv cov khoom siv hluav taws xob tsim nyog, yuav luag pob tshab oxide zaj duab xis maj mam ua rau ntawm qhov chaw. Cov yeeb yaj kiab no tsis yog tsuas yog cais cov neeg ua haujlwm corrosive nkaus xwb tab sis kuj tseem nthuav tawm cov xim zoo nkauj los ntawm kev cuam tshuam ntawm lub teeb, xws li los ntawm kev hloov maj mam silvery hues mus rau sib sib zog nqus xiav thiab ntshav, txhua qhov ntxoov ntxoo sawv cev rau kev sib txuas ntawm kev tshawb fawb thiab kev zoo nkauj.
Cov ntsiab lus tseem ceeb ntawm Anodizing
Kev Xaiv Electrolyte: Feem ntau, cov khoom sib xyaw uas muaj phosphoric acid, sulfuric acid, thiab lwm yam khoom siv yog siv, ua kom muaj kev loj hlob zoo ntawm oxide zaj duab xis.
Voltage thiab Sijhawm Tswjhwm: Voltage ncaj qha cuam tshuam lub thickness thiab xim ntawm oxide zaj duab xis, thaum lub sij hawm txiav txim siab qhov twg ntawm cov tshuaj tiv thaiv oxidation. Kev siv hluav taws xob ntau dhau los yog lub sijhawm ntev tuaj yeem ua rau cov txheej tuab dhau los lossis ua rau tawg ntawm zaj duab xis.
Tom qab Kev Kho Mob: Tom qab oxidation, kev tu kom huv thiab kev sib khi yog tsim nyog los xyuas kom meej qhov ruaj khov thiab ruaj khov ntawm oxide zaj duab xis.
Thermal Passivation
Cov ntsiab lus tseem ceeb
Temperature Control: Kub ua hauj lwm raws li ib tug tseem ceeb parameter nyob rau hauv thermal passivation; Thaum tshav kub kub ntau dhau yuav ua rau cov khaubncaws sab nraud povtseg los yog tev tau oxide, thaum tshav kub tsis txaus yuav ua tsis tau zoo oxide txheej.
Soaking Sijhawm: Lub sijhawm ntawm kev ntub dej txiav txim siab lub thickness thiab uniformity ntawm oxide txheej.
Cov Txheej Txheem Kev Ua Kom Zoo Tshaj Plaws: Qhov ceev ntawm cov cua txias ncaj qha cuam tshuam rau cov qauv thiab kev ua haujlwm ntawm oxide txheej.
Tshuaj Passivation
Chemical passivation muaj ob kauj ruam tseem ceeb: kua qaub ntxuav thiab tshuaj passivation. Acid tu pab tshem tawm cov roj, oxides, thiab lwm yam impurities los ntawm qhov chaw ntawm titanium alloys, tsim lub hauv paus pristine rau cov tshuaj passivation tom ntej. Chemical passivation entails cov tshuaj tiv thaiv tshwj xeeb nrog cov titanium alloy nto los tsim cov yeeb yaj kiab oxide tuab.
Cov ntsiab lus ntawm Acid Cleaning Passivation
Kev Kho Mob Ua Ntej: Kev tu txhua yam, degreasing, thiab tshem tawm cov roj yog cov kauj ruam tseem ceeb uas yuav tsum tau ua kom huv si.
Acid Bath Selection and Dilution: Nitric acid daws yog nyiam vim lawv cov khoom muaj zog oxidizing thiab compatibility nrog titanium alloys. Qhov tseeb dilution yog qhov tseem ceeb los tiv thaiv cov cim ntawm "daj pa taws."
Lub Sijhawm Txoj Cai: Kev tswj xyuas meej ntawm lub sijhawm ntxuav cov kua qaub yog qhov tseem ceeb; Lub sijhawm ntev dhau los yuav qhia txog cov ntsiab lus hydrogen ntau dhau, cuam tshuam rau kev ua haujlwm ntawm cov hlau, thaum lub sijhawm luv luv yuav tsis ua tiav cov txiaj ntsig zoo tu.
Tom qab Kev Kho Mob: Kev yaug kom huv si thiab ziab yog cov kauj ruam tseem ceeb los xyuas kom meej qhov ua tau zoo ntawm cov kua qaub. Kev ywg dej yuav tsum tau muab tshem tawm cov kua qaub uas seem, thaum ziab yuav tsum tiv thaiv cov dej ntawm qhov chaw.
