Taw qhia: kev tsim khoom ntawmYas KhoomFeem ntau suav nrog plaub qhov tseem ceeb: pwm tsim, kev kho deg, luam ntawv, thiab kev sib dhos. SOF Kev Kho Mob yog qhov tseem ceeb tsis tseem ceeb. Txhawm rau txhawm rau txhim kho lub zog ntawm cov txheej thiab muab txoj hauv kev zoo rau cov plating, cov txheej txheem kev kho ua ntej yog qhov tseem ceeb.
Nto Pretreatment ntawm Cov Khoom Siv Yas
Feem ntau suav nrog kho cov kev kho mob thiab kho plating. Feem ntau, cov huab cua muaj qib loj ntawm crystallinity, me polarity lossis tsis muaj polarity, thiab tsis muaj zog saum npoo, uas yuav cuam tshuam cov nplaum ntawm txheej. Txij li cov yas yog cov tshuaj insulator uas tsis yog ua haujlwm, nws tsis tuaj yeem ua ncaj qha rau ntawm cov yas raws li cov txheej txheem hluav taws xob dav dav raws li cov txheej txheem tshwj xeeb. Yog li ntawd, ua ntej kev kho deg, tsim nyog pretreatment yuav tsum tau txhim kho cov txheej sib luag ntawm cov txheej thiab muab lub zog zoo rau lub zog ua plating.
Pretricatment ntawm Txheej
Pretricatment suav nrog cov roj thiab tso cov roj thiab tso cov yas nto, txhawm rau txhim kho cov nplaum ntawm txheej.
1, degreasing
Degreasing ntawmYas KhoomCov. Zoo ib yam li degreasing ntawm cov khoom hlau, degreasing ntawm cov khoom yas tuaj yeem ua tau los ntawm kev tu cov kuab tshuaj lossis cov kev daws teeb meem akaline muaj surfactants. Degreasing nrog cov kuab tshuaj organic yog qhov haum rau kev ntxuav cov paraffin, beeswax, rog thiab lwm yam av av los ntawm cov yas. Cov kuab tshuaj organic siv yuav tsum tsis yaj, swell lossis tawg cov yas, thiab nws muaj qhov tsis tshua muaj qhov tsis tshua muaj, yog qhov tsis tshua muaj kuab, tsis yog-lom thiab tsis muaj tshuaj tua kab. Alkaline autsous cov kev daws teeb meem yog tsim rau degreas-resistant plastics. Kev daws muaj caustic dej qab zib, alkaline salts thiab ntau yam surfactants. Qhov feem ntau siv surfactant yog qhov op series, piv txwv li alkylphenol polyoxen ether, uas tsis ua npuas thiab tsis nyob ntawm cov yas nto.
2, Nto Ua Kom
Qhov kev ua kom muaj zog no yog txhawm rau txhim kho cov teeb meem saum npoo av ntawm cov huab cua, uas yog cov txheej txheem yas lossis kom yooj yim dua li pov tseg thiab adsorbed nyob rau saum npoo ntawm workpiece. Muaj ntau txoj hauv kev los kho kev kho mob saum npoo av, nplaim taws oxidation, fasxes oxidation, hnyav vapor etching thiab corona ou oxidation. Kev kho cov tshuaj lom neeg siv tshuaj lom neeg siv tshuaj tua kab, thiab nws cov poov xab raug, thiab 87,5% concentrated sulfuric acid (ntau dua 96%).
Qee cov khoom yas yas, xws li polystyrene thiab Abs Plastics, tuaj yeem siv ncaj qha tsis muaj tshuaj oxidation kev kho mob. Txhawm rau kom tau txais cov txheej zoo zoo, tshuaj oxidation oxidation kuj tau siv. Piv txwv li, tom qab degreasing, abs yas tuaj yeem etched nrog dilute chromic acid kho ua kua. Nws cov kws kho mob raug yog 420g / l chromic acid thiab 200ml / l sulfuric acid (tshwj xeeb gridity (153). Cov txheej txheem kho mob yog 65 ℃ 70 ℃ / 5min10min, ntxuav ntxuav, thiab kom qhuav. Qhov zoo dua ntawm kev etching nrog chromic acid kho kua yog tias tsis muaj teeb meem li cas cov duab ntawm cov khoom lag luam yas yog, nws tuaj yeem kho tusyees. Qhov tsis zoo yog tias kev ua haujlwm yog qhov txaus ntshai thiab muaj cov teeb meem vibinging.
Pretreatment ntawm Txheej Txheej
Lub hom phiaj ntawm pretreatment ntawm txheej txheej yog txhawm rau txhim kho cov nplaum ntawm cov txheej yas thiab kom tsim cov hlau sib txuas hauv qab. Txheej txheem pretreatment feem ntau suav nrog: kev siv tshuab, tshuaj lom neeg siv tshuaj, kev kho mob, kev kho mob thiab tshuaj lom neeg plating. Thawj peb yam khoom yog txhawm rau txhim kho cov nplaum ntawm txheej, thiab plaub yam dhau los yog tsim cov khoom siv hlau hauv qab.
1, kev kho tshuab rougening thiab tshuaj lom neeg
Kev kho tshuab rougening thiab tshuaj lom rougening kev kho yog ua kom cov yas rougher los ntawm cov tshuab siv hluav taws xob los ntawm cov tshuab sib tiv toj ntawm cov txheej sib ze ntawm cov txheej thiab substrate. Nws yog feem ntau ntseeg hais tias kev sib raug zoo quab yuam uas tuaj yeem ua tiav los ntawm kev ntxhib txhua yam tsuas yog kwv yees li 10% ntawm cov tshuaj uas muaj tshuaj lom neeg.
2, tshuaj lom neeg degreasing
Cov txheej txheem degreasing rau pretreatment ntawm cov yas saum npoo av yog tib yam li cov txheej txheem degreasing rau pretreatment ntawm txheej.
3, sensitization
Cov tsis muaj teeb meem yog los Adsorb qee cov tshuaj uas yooj yim, xws li cov tichloride, thiab lwm yam. Cov qauv adsorbed yooj yim oxidized cov tshuaj yog oxidized thaum lub zog kho, thiab cov activator kom catalytic crystal nuclei thiab nyob rau ntawm cov khoom. Lub luag haujlwm ntawm lub luag haujlwm yog kom nteg lub hauv paus rau cov tshuaj tua tom qab plating txheej hlau hlau.
4, ua kom
Kev ua kom ua kom yog los kho cov rhiab heev nrog kev pab ntawm kev daws teeb meem ntawm catalyticically cov hlau sib txuas. Nws essence yog kom tshem cov khoom tawm nrog tus neeg sawv cev txo cov tshuaj axidant uas muaj cov neeg siv tshuaj aque, thiab cov qauv txo qis, thiab cov hlau txo qis nyob rau ntawm Nto ntawm cov khoom hauv daim ntawv ntawm colloidal hais, uas muaj qhov muaj zog catalytic kev ua. Thaum cov nplaim hluav taws no tso rau hauv cov tshuaj siv tshuaj lom neeg, cov khoom no ua cov chaw zov me nyuam catalalytic, uas ua kom nrawm dua cov tshuaj tiv thaiv kev plating.
5, Txo Kho Mob
Ua ntej kev plating Plating, cov khoom uas tau qhib thiab ntxuav nrog cov dej huv ntawm cov tshuaj tiv thaiv kom txo tau cov tshuaj tiv thaiv kom txo tau thiab tshem tawm cov actwashed. Qhov no yog hu ua kev kho kom txo qis. Thaum cov tshuaj tooj liab tau plated, formaldehyde tov yog siv rau kev txo qis, siv cov tshuaj nickel yog siv rau kev kho kom txo qis.
6, Tshuaj Plating
Lub hom phiaj ntawm kev ua yeeb yam ntawm kev ua yeeb yaj kiab yog tsim cov khoom siv hlau ua ke nyob rau ntawm cov khoom siv yas los tsim cov khoom siv hluav taws xob ntawm cov hlau txheej ntawm cov khoom siv yas. Yog li, tshuaj txhuam plating yog cov kauj ruam tseem ceeb hauv yas electroplating.
Lub sij hawm Post: Jun-13-2024