Xaiv qhov kev kho deg los ntawm Kev Ua Haujlwm Lub Hom Phiaj
Kev qhia txog kev kho saum npoo rau ib qho txhuas tivthaiv yog ib lo lus nug ntawm kev sib piv cov hom tsis ua haujlwm rau cov txheej txheem pheej yig tshaj uas swb nws. Corrosion, abrasion, xim tuav, huv si thiab nplaum nplaum lub zog txhua qhov taw qhia rau ib tsev neeg sib txawv ntawm kev kho mob, thiab nyob rau hauv feem ntau cov rooj sib txoos ob los yog peb ntawm lawv tau ua ke nyob rau hauv ib theem zuj zus.
Cov ntu hauv qab no sib piv cov kev uas feem ntau tau teev tseg rau kev tsim vaj tsev, kev thauj mus los thiab kev siv cov txheej txheem, nrog rau cov kev lees paub uas txiav txim siab seb cov txheej txheem puas raug tswj xyuas.
Anodizing Systems rau Architectural thiab Structure Cheebtsam
Anodic films yog zus los ntawm cov hlau nws tus kheej, yog li lawv tsis tuaj yeem nti lossis tev tawm ntawm lub substrate. Kev xaiv ntawm txheej txheem teev cov thickness, hardness thiab xim txoj kev.
| Qhov system | Zaj duab xis thickness | Xim txoj kev | Lub hom phiaj tsim |
|---|---|---|---|
| Sulfuric acid anodizing, Hom II | 5-25 µm | Organic dye absorption lossis electrolytic coloring | Sab hauv thiab lub teeb sab nraum zoov kev pabcuam, kho kom zoo nkauj tiav |
| Hardcoat anodizing, Hom III | 50 µm thiab siab dua | Feem ntau sab laug ntuj lossis dyed tsaus | Cov qauv, zawv zawg thiab hnav- qhov chaw raug |
| Electrolytic ob -pab xim xim | Ua rau hom II lossis hom III zaj duab xis | Hlau ntsev tso rau hauv qhov pores | Bronze thiab dub architectural tones nrog lub teeb nrawm nrawm |
Hom II thiab Hom III cov qauv tsim, ua ke nrog lawv cov chav kawm tuab, ua raws li MIL-A-8625 lub moj khaum, thiab cov khoom tsim vaj tsev raug soj ntsuam ntxiv rau AAMA 611 rau kev ua yeeb yaj kiab thiab xim ruaj khov. Sealing yog ua nyob rau hauv boiling dej deionised los yog nrog ib tug hlau ntsev foob; Lub foob zoo yog dab tsi hloov cov yeeb yaj kiab qhib rau hauv ib qho kev tiv thaiv ruaj khov.
Powder Coating Versus Liquid Painting
Kev sib piv kev lag luam thiab kev sib piv ntawm cov hmoov txheej thiab cov xim ua kua yog txiav txim siab los ntawm kev siv cov khoom siv, cov yeeb yaj kiab tsim thiab kev tswj hwm ib puag ncig.
| Parameter | Hmoov txheej | Cov xim ua kua |
|---|---|---|
| Kev siv cov khoom siv | Kwv yees li ntawm 95 feem pua, nrog kev rov qab los ntawm overspray | Kwv yees li 60 feem pua |
| Zaj duab xis tsim | Thermoset hmoov melted thiab hla-txuas rau hauv qhov cub | Cov kuab tshuaj los yog dej los ntawm cov resin qhuav thiab kho |
| Chip tsis kam | Thicker, tougher zaj duab xis rau tib tus lej ntawm kev hla | Lower film tsim ib lub tsho loj |
| Xim tswj | Matched tiv thaiv cov qauv xim siv raws li cov hmoov qhuav | Sib phim hauv daim ntawv ntub dej, nrog cov kuab tshuaj- ntsig txog ntxoov ntxoo drift |
| Cov pa tawm | Qhov tseem ceeb solvent dawb | Volatile organic tebchaw yuav tsum tau ntes los yog abated |
Ua ntej- kev kho mob yog tib yam rau ob txoj hauv kev: chromium- ntxuav dawb thiab hloov pauv cov kauj ruam ua ntej, yog li cov txheej txheem adhesion ntawm cov hlau sib txuas tsis yog qhov sib txawv. Cov kev txiav txim siab sib txawv feem ntau yog cov yeeb yaj kiab toughness, xim hloov tau yooj yim thiab tus nqi ntawm cov kuab tshuaj tuav thiab emission tswj.
Anti-Ntiv tes thiab yooj yim- Cov Txheej Txheem huv
Liab qab thiab anodized txhuas qhov chaw qhia txhua tus ntiv tes, thiab rov ua dua nrog cov tshuaj ntxuav kom nruj dulls cov hniav zoo nkauj dhau sijhawm. Hydrophobic nano-coatings raws li silane chemistry daws qhov no los ntawm kev txo qis lub zog kom cov roj thiab cov dej noo tuaj yeem hloov pauv.
Cov menyuam txheej siv cov txheej txheem tiv thaiv - ntiv tes thaum lub sijhawm zeb tiav, muab cov yeeb yaj kiab zoo ib yam ntawm cov khoom coil.
Cov khaubncaws sab nraud povtseg ncav cuag lub kaum sab xis saum toj 90 degrees, uas yog qhov tso cai rau cov khoom seem pov tseg nrog daim ntaub qhuav.
Abrasion kuj raug txheeb xyuas los ntawm kev kuaj kev puas tsuaj, feem ntau yog qhov yuav tsum tau muaj ntau tshaj 500 lub voj voog ua ntej cov nyhuv degrades.
Cov kev kho mob yog sib xws nrog anodizing, yog li ib tug tivthaiv muaj peev xwm nqa tau ib tug hniav anodic zaj duab xis nyob rau hauv ib tug yooj yim functional - huv si sab saum toj txheej.
Tsis yog -Chromate Conversion Coatings rau Aerospace Alloys
Chromate hloov dua siab tshiab txheej tseem yog cov txheej txheem siv rau aerospace txhuas vim tias cov yeeb yaj kiab yog tus kheej - kho thiab tiv thaiv cov npoo thiab cov qhov txuas. Lawv cov kev xav tau ntawm kev ua tau zoo yog txhais los ntawm MIL-DTL-5541, uas cais cov txheej txheem los ntawm chav kawm raws li qib kev tiv thaiv corrosion, thiab kev tswj cov txheej txheem yog raws li cov txheej txheem hnyav ntawm ib cheeb tsam, nrog rau Chav Kawm 3 cov yeeb yaj kiab nyob hauv thaj tsam li 10-40 mg / ft².
Vim hais tias hexavalent chromium nqa lub nra hnyav, lwm txoj kev chemistry tau qhia:
Trivalent chromium txheej txheem, uas ua rau tus kheej - kho tus cwj pwm thaum tshem tawm hexavalent chromium los ntawm da dej thiab dej yaug.
Zirconium-titanium raws li cov yeeb yaj kiab, uas muab chromium- tiv thaiv dawb thiab ua haujlwm zoo ua lub hauv paus rau kev pleev xim tom ntej.
Cov txheej txheem tswj raws li txheej hnyav dua li ntawm cov xim pom, vim cov yeeb yaj kiab tshiab yuav luag tsis muaj xim thiab tsis tuaj yeem txiav txim los ntawm qhov muag.
Cov txheej txheem hloov dua siab tshiab kuj tseem ua haujlwm raws li cov xim pleev xim: ntawm daim tawv nqaij tis thiab fuselage panels nws txhim kho adhesion thiab txwv galvanic nres qhov twg cov txhuas sib txuas sib txawv ntawm cov fasteners, uas yog lub ntsiab yog vim li cas cov kev kho mob yog khaws cia txawm qhov twg corrosion tiv thaiv ib leeg yuav tsis thov nws.
Ua ntej-kev kho mob rau cov qauv Adhesive Bonding
Adhesive pob qij txha nyob rau hauv cov qauv txhuas tsis nyob rau hauv lub interface deb ntau tshaj nyob rau hauv cov nplaum nws tus kheej, yog li cov txheej txheem pretreatment yog cov txheej txheem tseem ceeb.
Alkaline ntxuavtshem tawm cov roj dov, ntiv tes roj thiab tuav cov av.
Acid etchingdissolves lub ntuj tsis muaj zog oxide thiab tsim ib tug micro{0}} ntxhib nto rau mechanical interlock.
Sol-gel kev kho mobtawm ntawm silane coupling txheej uas reacts nrog ob qho tib si oxide thiab cov nplaum.
Kev ua kom ntshav ntshavtsa lub zog saum npoo kom cov nplaum ntub tag nrho saum npoo thiab nkag mus rau micro-roughness.
Daim ntawv cog lus zoo tau raug lees paub ntawm daim ntawv pov thawj pov thawj los ntawm kev xeem lap shear rau ASTM D1002, nrog rau kev lees paub qhov tseem ceeb rau cov qauv kev sib koom ua ke siab tshaj 20 MPa. Vim hais tias qhov chaw deg decays nyob rau hauv lub sij hawm ntawm pretreatment, lub sij hawm ntawm kev npaj thiab kev sib raug zoo yog nws tus kheej ib tug tswj parameter nyob rau hauv ntau lawm.
Cov lus nug nquag
Q: Cov txheej txheem anodizing twg yog siv rau corrosion -resistant architectural finishes?
Sulfuric acid anodizing, Hom II, tsim 5-25 µm oxide txheej rau sab hauv tsev thiab kho kom zoo nkauj, thaum hardcoat Hom III ncav cuag 50 µm thiab siab dua rau cov khoom siv. Xim los ntawm electrolytic deposition ntawm hlau ntsev mus rau hauv lub qhov hws, thiab sealing nyob rau hauv boiling dej los yog nrog ib tug npib tsib xee acetate foob ua kom tiav.
Q: Ua li cas hmoov txheej piv nrog cov kua pleev xim rau hauv tus nqi thiab kev ua haujlwm?
Hmoov txheej siv li ntawm 95 feem pua ntawm nws cov khoom tiv thaiv kwv yees li 60 feem pua rau cov xim ua kua, thiab cov yeeb yaj kiab kho tau zoo dua li cov xim ntub dej ntawm cov yeeb yaj kiab zoo sib xws. Xim hloov tau siab thiab hnyav emissions raug zam, thaum lub ntsej muag ua ntej - kev kho mob yog tib yam rau ob txoj kev.
Q: Yuav ua li cas tiv thaiv - ntiv tes coatings ua haujlwm?
Hydrophobic silane raws li nano{0}}coatings qis zog saum npoo kom cov roj thiab noo noo hlaws li tsis sib kis. Lawv tuaj yeem ua rau cov menyuam-coated thaum lub sijhawm zeb tiav, ncav cuag cov dej sib cuag saum toj 90 degrees, thiab ua kom lawv cov txiaj ntsig dhau 500 lub voj voog.
Q: Vim li cas cov txheej txheem hloov pauv tseem ceeb ntawm aerospace aluminium?
Lawv tsim ib tus kheej -kho zaj duab xis uas txwv galvanic corrosion thiab txhim kho xim adhesion ntawm daim tawv nqaij thiab panels. Cov kev cai ua tub rog tau txhais nyob rau hauv MIL-DTL-5541, txheej hnyav yog tswj ib cheeb tsam, thiab trivalent chromium los yog zirconium lwm txoj kev tau teev tseg ntau dua es tsis txhob hexavalent chromium.
Q: Yuav ua li cas ua ntej- kho kom zoo rau cov nplaum nplaum?
Los ntawm kev sib txuas cov alkaline tu, acid etching rau micro-roughness, sol-gel silane coupling txheej thiab plasma ua kom nce lub zog saum npoo, tom qab ntawd sib txuas hauv lub sijhawm tswj lub qhov rais. Lap shear xeem rau ASTM D1002 paub meej tias daim ntawv cog lus muaj zog tshaj 20 MPa.
Q: Cov kev kho deg sib txawv puas tuaj yeem ua ke ntawm ib feem?
Yog, thiab lawv feem ntau yog. Ib qho kev sib txuas ua ke ua ke ib qho kev ua tiav los yog txheej txheej anodic nrog cov hmoov coated los yog yooj yim -huv txheej saum toj kawg nkaus, muab cov kauj ruam nruab nrab yog sib xws nrog cov chemistry hauv qab no thiab cov kev xeem lees paub tau khiav ntawm lub rooj sib txoos ua tiav.
