{{0 {}} Dab tsi yog ib qho corrosion-resistant alloy?
Tsim cov tuab, tus kheej kho oxide txheej (e . g}!
Ntim cov khoom siv aloying (e {. g}!
Tso tawm cov kev cuam tshuam qis nrog cov xov xwm tshwj xeeb (acids, ntsev, cov kuab tshuaj) .
Stainless hlau (316L, 2205 Duplex), titanium alloys, nickel-based alloys (astello alloys (5xxx series) {5} {5}
{{02. Qhov twg alloy muaj qhov siab tshaj plaws corrosion?
Nickel-molybdenum alloys (e {. g. hastelloy c}-276):
Tsis tawm muaj cov muaj zog acids (HCL, hso₄), chlorides, thiab high-kub corrosion. lub tshuab dej hiav txwv {2}
Titanium alloys (e {{. g. {-4 v):
Zoo heev nyob rau hauv seawater, chlorinated ib puag ncig, thiab feem ntau acids ib puag ncig, thiab feem ntau} siv nyob rau hauv aerospace, kev siv tshuaj kho mob, thiab marine.
Zirconium alloys (e {{{0} g .}}}, zirconium 702):
Resistions concentrated acids thiab qhov siab-kub dej {{1} Siv nyob rau hauv nuclear reactors thiab tshuaj tso tsheb hlau luam .
Noble Hlau Alloys (E {. g .}, Kub, Platinum Alloys):
Zoo siv inert, tab sis kim heev .}} siv hauv cov khoom siv hluav taws xob thiab cov hniav nyiaj hniav kub.
{{0 {}} Dab tsi hom txhuas tsis xeb?
Ntshiab txhuas (99.0-99.9% al):
Cov ntaub ntawv ua cov yeeb yaj kiab al₂o₃, zoo tagnrho rau cov qauv tsis (E ., cov thawv tshuaj).
5xxx series (al-mg alloys):
5052, 50456: Ua cov ntsev, cov ntsev, thiab cov cuab yeej siv hluav taws xob, thiab cov ntug hiav txwv architecture.
6xxx series (al-mg-si alloys):
6061, 6063: corrosion-resistant nrog zoo formability.}} Cov qauv vaj tse anodized thiab sab nraum zoov cov qauv.
Txhuas nrog cov kev kho kom ncaj:
Anodized Aluminium (25+ μide txheej), pleev xim almes (e {}} al}}
4. dab tsi tua corrosion ntawm txhuas?
Mechanical / Tshuaj Tu: Tshem cov khoom corrosion (dawb al₂o₃ hmoov) nrog:
Me me abrasives (ci dej qab zib paste + mos txhuam) .
Acidic tshuaj ntxuav (phosphoric lossis citric acid daws, pH 3-5), ua raws los ntawm yaug .
Alkaline cov tshuaj huv (ammonia-raws li, ph 9-11) rau cov nyiaj tso tseg hnyav, tab sis tsis txhob hu lub sijhawm ntev {}}
Cov Khaub Ncaws Tiv Thaiv: Thov:
Anodizing (ua ib txheej oxide tshiab) .
Epoxy, Polyurethane, lossis Hmoov Txheej Txheem .
Corrosion inhibitors (e {{.}}}}}}}}}}}}}}}}}}}} {.
Kev hloov kho ib puag ncig:
Txo cov dej noo / ntsev raug (e {{{0} g .}, cov xov xwm rau sab nraum zoov pob qij txha).
Siv DesicCants hauv cov chaw uas muaj .
Cais tawm los ntawm cov koom tes galvanic (e {{{0} g}}, yas}, yas g gaskets ntawm al thiab hlau) {2}.
Cathodic Kev Tiv Thaiv:
Siv cov anodes rapodes (zinc lossis magnesium) kom thim corrosion tam sim no .
5. Yuav ua li cas yog Corrosion ntsuas ntawm txhuas?
Atmospheric corrosion:
Sab Nraud Sab Nraud: Cov hnoos qeev muab tso rau hauv nyob hauv nroog, Nroog, Tubrog nkoj, lossis chaw muaj ntau lub hlis / xyoo .
Kev ntsuas ntsev (ASTM B117): Kev kuaj tshuaj xyuas nrawm hauv 5% hauv 5%} g}, 1000 teev rau marine alloys).
Pitting corrosion:
Nacl + acid daws (astm g48): Kev tshuaj ntsuam tsis kam rau chloride-ntxias kom pitting hauv 6% fecl₃ tov {}}
Galvanic corrosion:
Coupled electrodes (ASTM G71): Kev ntsuas tam sim no ntws ntawm al thiab lwm cov hlau hauv nruab nrab ntawm nruab nrab.
Intergranular corrosion (IGC):
Exfoliation kev kuaj (ASTM G34): Txheeb xyuas txheej txheej-los ntawm-txheej corrosion raws cov ciaj ciam nplej, ntau hauv 2xxx / 7xx series.
Kev kub-kub corrosion:
Kev ntsuam xyuas Oxidation: Cov qauv rhuab hauv huab cua los ntsuas qhov hnyav nce ntawm ol oxide tsim .
