1. Dab tsi yog thawj lub cev corrosion cuam tshuam rau txhuas ntawv ci?
Aluminium Ntawv Nyiaj Corrosion tshwm sim los ntawm peb txoj hauv kev loj:
Pitting corrosion: Cov ntaub ntawv 0. {{{{Leth} nkauj inch pits hauv chloride ib puag ncig (piv txwv li thaj chaw ntug dej hiav txwv)
Galvanic corrosion: Accelerates thaum hu rau tooj liab ({0. 5v) lossis steel
Intergranular corrosion: {3000- series alloys ntawm grain ciam teb
Txoj kev tiv thaiv xws li:
99.5% ntshiab txhuas (en aw -1050}) qhia 5x zoo dua tsis kam tshaj 3003 alloy
Chromate conversion coatings provide 500+ hours salt spray resistance
Anodizing (10-25 μm thickness) nce kev tiv thaiv los ntawm 300%
2. Yuav ua li cas tagnrho muaj kev sib xyaw ua ke cuam tshuam corrosion tsis kam?
Qhov tseem ceeb sib piv:
Alloycu contotmn cov ntsiab lus tseemcorrosion (hli \/ xyoo}}}} {}}}}. {}}}}}}
Kev Qhia Txog:
Txhua 0. 1% tooj liab nce corrosion tus nqi los ntawm 15%
Magnesium additions (>1%) Txhim Kho Seasater Kuj
Cov ntsiab lus hlau yuav tsum yog<0.7% for food-grade applications
3. Dab tsi cov kev kho cov khoom sib npaug
Niaj hnub no kho technologies:
Tshuaj Hla:
Chromate-Kev Kho Mob Dawb Ua tau tiav 168H nruab nrab ntsev txau tiv thaiv
Cov kab mob taub hau txo qis corrosion tam sim no los ntawm 9 {1}}}% (0.1μs \/ cm²)
Ntshav hluav taws xob elecma electrolytic oxidation:
Tsim 10-30 μm Tej hub txheej
Withstand 1000h ASTM B117 kuaj
Polymer laminates:
12μm tsiaj txheej muab 10-} xyoo kev tiv thaiv sab nraum zoov
FDA-Ua Raws Epoxy Primers rau cov khoom noj
4. Yuav ua li cas ib puag ncig qhov ntsuas nrawm dua?
Qhov ntsuas tseem ceeb:
Kev vaum: >60% siv ob npaug rau fab
Qho so: Txhua 10 degree nce cov kev sib tw ceev ceev
pH qhov tseem ceeb: <4 or >9 ua rau cov teeb meem sai sai
Tus kab chlorides: >50PPPM yuav tsum muaj cov tshuaj pleev xim tiv thaiv
Kev Lag Luam Kev Lag Luam: Cov Ntawv Nyiaj Ua Lag Luam ntawm 25μm Thickness kav:
5+} xyoo nyob rau hauv kev tswj hwm sab hauv tsev ib puag ncig
<2 years in tropical coastal climates
5. Dab tsi cov qauv kev ntsuas ntsuas ntsuas cov khoom ci corrosion?
Qauv kev tshuaj xyuas cov txheej txheem:
ASTM G85: Hloov Ntsev Tsuag Ntsuas Cov Tshuaj Tsuag
ISO 9227: Nruab nrab ntsev tshuaj txau (500-2000 h xeem)
ASTM B117: Txheem 5% nacl tshuaj tsuag
Electrochemical kev ntsuam xyuas:
Potentiodynamic Polarization (Ntsuas ECRR)
EIS (impedance >10⁶ ω ω ω 3nk qhia txog kev tiv thaiv zoo)
Cov txuj ci kub:
SKP (scanning Kelvin kev sojntsuam) kuaj xyuas thaum ntxov-theem corrosion
AFM-IR pom tias muaj kev hloov cov tshuaj lom neeg
