Yam Ntxim Saib Ntxim Ua Li Cas Xav Kom Xa
Ib qho txhuas tivthaiv tawm hauv lub tshuab dov nrog ib txwm ua haujlwm oxide zaj duab xis tsuas yog ob peb nanometers tuab. Nws tiv thaiv cov hlau ntev txaus rau kev thauj mus los, tab sis nws yog qhov nyias nyias thiab muag heev rau qhov chaw pabcuam cuam tshuam nrog kev puas tsuaj, ntsev, tshuaj, rov ua dua los yog kev sib txuas ntawm cov qauv. Surface engineering hloov cov zaj duab xis ntuj nrog rau txheej txheej txheej txheej, lossis nrog txheej txheej uas siv rau saum nws.
Lub hom phiaj ua haujlwm yog ib txwm ua ke ntawm plaub qhov kev xav tau: kev tiv thaiv corrosion, hnav tsis kam, zoo li, thiab adhesion rau cov xim tom qab los yog nplaum sib koom ua ke. Vim tias cov kev xav tau no feem ntau tsis sib haum, cov txheej txheem raug xaiv los ua ib ntus tsis yog ua haujlwm ib zaug - tu, pretreatment, txheej loj hlob, xim qhov xav tau, thiab sealing lossis kho.
Anodizing: Loj hlob Oxide Hloov Kho Nws
Anodizing yog cov txheej txheem hloov hluav taws xob hluav taws xob: aluminium nto nws tus kheej tau noj thiab rov tsim kho dua li cov ntxeem tau anodic oxide. Cov pores yog dab tsi ua rau cov txheej txheem ntau yam, vim tias lawv tuaj yeem txais cov dyes thiab sealants.
| Txheej txheem | Hom txheej thickness | Hom kev siv | Sau ntawv |
|---|---|---|---|
| Sulfuric acid anodizing (Tim II) | 5-25 µm | Architectural thiab hniav Cheebtsam, cov neeg siv khoom vaj tse | Porous, dyeable, kaw nyob rau hauv boiling dej los yog nrog ib tug hlau ntsev foob |
| Hard anodizing (Hom III) | 50-100 µm | Hnav qhov chaw, lub tog raj kheej, zawv zawg qhov chaw | Khiav hauv chilled electrolyte kom tsis txhob hlawv; denser thiab nyuaj |
| Phosphoric acid anodizing | Nyias, tswj | Adhesive bonding npaj | Ua ib tug zoo, bondable qauv es ib tug hnav txheej |
Xim yog tau los ntawm absorbing dye rau hauv qhov qhib pores ua ntej sealing, los yog los ntawm electrolytic colouring, qhov twg hlau ntsev yog tso rau hauv lub pore qauv muab bronze thiab dub tones uas tiv fading zoo dua organic dyes. Sealing hydrates cov oxide thiab kaw qhov pores; nws yog cov kauj ruam uas txiav txim siab seb qhov kev ua tau zoo corrosion puas muaj sia nyob ntau xyoo ntawm kev raug sab nraum zoov.
Rau kev ua haujlwm vaj tsev ua tiav cov yeeb yaj kiab anodic raug soj ntsuam los ntawm kev ua haujlwm ntawm AAMA 611, thiab kev kuaj corrosion ua raws li ASTM B117 lossis ISO 9227 nruab nrab ntsev tsuag. Txheej thickness thiab sealing zoo raug txheeb xyuas ua ntej cov khoom tawm ntawm txoj kab, vim tias ob qho tib si zoo irreversible thaum cov khoom sib dhos.
Powder Coating: Uniform Coverage on Complex Geometry
Cov hmoov txheej yog siv electrostatically, yog li them cov khoom qhwv ib ncig ntawm cov npoo, qhov chaw so thiab sab hauv cov ces kaum uas rab phom tsuag yuav nco. Cov txheej txheej yog tom qab ntawd kho rau hauv qhov cub, qhov twg cov hmoov melts, ntws thiab hla - txuas mus rau hauv cov yeeb yaj kiab polymer txuas ntxiv.
Kho qhov rais.Thermoset hmoov feem ntau kho tau ntawm 180-200℃, thiab lub sij hawm- qhov kub thiab txias ua ke txiav txim siab qhov kawg ntawm qhov sib txuas ceev.
Sab nrauv durability.UV- cov xim ruaj khov thiab cov tshuab khi ua kom xim thiab ci ntsa iab sab nraum zoov; fluoropolymer formulations txuas tshuaj lom neeg thiab huab cua tsis kam rau kev lag luam ib puag ncig.
Qhov tshwm sim ntau yam.Kev ua tiav ua tiav los ntawm du siab gloss mus rau qhov zoo nkauj zoo nkauj thiab wrinkle cuam tshuam rau tactile thiab tiv thaiv - glare nto.
Txheej txheem kev lag luam.Overspray tuaj yeem rov qab tau thiab rov qab siv dua, uas khaws cov khoom siv siab piv nrog cov kua pleev xim, thiab emissions ntawm volatile organic tebchaw yog tsawg.
Kev hloov pauv txheej thiab lawv tsis yog -Chromate Hloov
Conversion coatings yog nyias chemical films tsim los ntawm reacting lub huv txhuas nto nrog ib tug kho da dej. Lawv ntxiv yuav luag tsis muaj qhov hloov pauv, uas ua rau lawv zoo tagnrho rau kev sib ze - qhov chaw kam rau ua thiab npaj qhov chaw rau xim lossis nplaum.
Chromate conversion txheejtsim cov yeeb yaj kiab daj rau ntsuab nrog tus kheej -kev coj tus cwj pwm zoo thiab tau hais dav dav rau aerospace aluminium alloys. Lawv qhov kev ua tau zoo yog tswj hwm los ntawm MIL-DTL-5541, nrog cov txheej txheem tswj cov txheej txheem hnyav ntawm ib cheeb tsam.
Trivalent chromiumcov txheej txheem xa cov tsos zoo sib xws thiab kev tiv thaiv corrosion tsis muaj hexavalent chromium, uas yooj yim rau kev kho cov khib nyiab thiab kev tiv thaiv cov neeg ua haujlwm.
Titanium{0}}zirconium systemsmuab chromium-cov yeeb yaj kiab dawb tsim nyog rau kev tsim vaj tsev thiab kev lag luam dav dav, thiab sib xws nrog cov hmoov txheej txheej.
Phosphoric acid raws li kev kho mobtsim cov qauv zoo oxide uas txhim kho cov nplaum nplaum hauv kev sib dhos hauv tsheb.
Mechanical Surface Treatments
Tsis yog txhua qhov kev xav tau saum npoo yog daws los ntawm chemistry. Mechanical kev kho mob hloov lub topography thiab cov residual kev nyuaj siab lub xeev ntawm nto txheej.
| Kev kho mob | Cov nyhuv ntawm qhov chaw | Yam khoom |
|---|---|---|
| Tua peening | Qhia txog compressive residual stress | Nkees nkees-caj npab tseem ceeb thiab forgings |
| Electropolishing | Tshem tawm micro- impurities thiab theem micro- roughness | Ntxuav- cov khoom siv kho mob tseem ceeb |
| Txhuam xov | Tsim cov kev taw qhia zoo nkauj zoo nkauj | Architectural panels thiab trims |
| Laser ablation | Tsim cov tswj micro-craters | Roj- tuav lub tog raj kheej bores |
| Vibratory polishing | Deburrs thiab blends internal channels | Kub exchangers thiab manifolds |
Kev txhaj tshuaj peening yog ib qho txheej txheem hauv pab pawg no uas ua rau hauv qab ntawm qhov chaw: qhov induced compressive txheej retards qaug zog tawg pib, uas yog vim li cas nws yog teev nyob rau hauv cyclically loaded txhuas qhov chaw es tsis yog tsuas yog rau cov tsos.
Advanced thiab Functional Coatings
Thaum cov pa anodizing lossis pleev xim tsis txaus, plasma electrolytic oxidation converts nto rau hauv cov ceramic tuab -zoo li oxide txheej nrog siab thermal thiab hnav tsis kam. Lub cev vapor deposition siv cov yeeb yaj kiab nitride nyuaj xws li txhuas titanium nitride rau cov cuab yeej txiav thiab hnav cov khoom. Sol-gel chemistry muab cov pob tshab los tiv thaiv- ntiv tes thiab yooj yim- cov txheej huv huv rau cov ntaub thaiv npog, thaum cov xim nanocomposite txhawb kev khawb hauv cov ntaub ntawv ntshiab. Conductive finishes yog siv qhov twg electromagnetic shielding yuav tsum tau nyob ib ncig ntawm rhiab electronics.
Kev xaiv ntawm cov kev no ua raws li hom tsis ua haujlwm tseem ceeb. Ib feem uas ua tsis tau los ntawm kev hnav yuav tsum muaj txheej tawv; ib feem uas ua tsis tau los ntawm corrosion xav tau ib qho kev thaiv lossis tus kheej -kho zaj duab xis; ib feem uas ua tsis tau los ntawm kev qaug zog yuav tsum muaj kev nyuaj siab; ib feem uas ua tsis tau los ntawm cov xim tsis xav tau adhesion nce qib ntawm lub interface.
Cov lus nug nquag
Q: Yuav ua li cas anodizing tiv thaiv aluminium nto?
Electrochemical txoj kev loj hlob hloov cov hlau saum npoo mus rau hauv cov txheej txheem aluminium oxide ntxeem tau. Sulfuric acid anodizing produces dense films of roughly 5-25 µm for architectural parts, hard anodizing in chilled electrolyte creates 50-100 µm wear layers, dye absorption adds colour before sealing, and sealing in boiling water hydrates the oxide to close the pores.
Q: Dab tsi yog qhov zoo ntawm cov hmoov txheej?
Electrostatic daim ntawv thov muab kev tiv thaiv zoo ib yam ntawm cov duab geometry, kho ntawm 180-200℃ua tus ntoo khaub lig- txuas polymer network, UV-resistant pigments khaws cov xim sab nrauv kom ruaj khov, textured finishes muaj rau cov teebmeem tactile, thiab fluoropolymer qib ntxiv tshuaj tiv thaiv rau kev lag luam.
Q: Yuav ua li cas hloov cov coatings ua haujlwm?
Lawv tsim ib daim nyias nyias, tus kheej - kho cov tshuaj yeeb yaj kiab los ntawm cov tshuaj tiv thaiv rau saum npoo. Chromate systems yog siv nyob rau hauv aerospace alloys, trivalent chromium thiab titanium-zirconium systems yog chromium-dawb lwm txoj kev, thiab phosphoric acid kev kho mob txhim kho adhesion bonding nyob rau hauv tsheb sib dhos.
Q: Cov kev kho kho tshuab twg txhim kho lub neej qaug zog?
Tua peening, vim nws induces ib tug compressive residual kev nyuaj siab txheej uas retards qaug zog tawg pib. Electropolishing, txhuam xov, laser ablation thiab vibratory polishing hloov roughness, tsos los yog khib nyiab ntau dua li lub xeev kev ntxhov siab.
Q: Puas yog chromium-cov tshuaj kho dawb zoo li chromate hloov dua siab tshiab?
Rau ntau qhov chaw tsim vaj tsev thiab kev lag luam, titanium-zirconium films phim chromate systems hauv xim adhesion thiab corrosion. Rau siab -xav tau aerospace alloys lwm cov txheej txheem yog tsim nyog tiv thaiv tib txheej txheej hnyav thiab ntsev tsuag cov txheej txheem lees txais ua ntej tso cai.
