Kev Taw Qhia: Cov txheej txheem tsim khoom ntawmcov khoom yasfeem ntau suav nrog plaub txoj hauv kev tseem ceeb: kev tsim pwm, kev kho qhov chaw, kev luam ntawv, thiab kev sib dhos. Kev kho qhov chaw yog ib qho tseem ceeb uas tsis tuaj yeem tsis tau. Txhawm rau txhim kho lub zog sib txuas ntawm cov txheej thiab muab lub hauv paus zoo rau kev plating, cov txheej txheem ua ntej kev kho yog qhov tseem ceeb.
Kev kho ua ntej ntawm cov khoom yas
Feem ntau suav nrog kev kho txheej thiab kev kho plating. Feem ntau, cov yas muaj ntau qib ntawm crystallinity, polarity me me lossis tsis muaj polarity, thiab lub zog nto qis, uas yuav cuam tshuam rau qhov lo rau ntawm txheej. Vim tias yas yog cov insulator tsis conductive, nws tsis tuaj yeem plated ncaj qha rau ntawm qhov chaw yas raws li cov txheej txheem electroplating dav dav. Yog li ntawd, ua ntej kev kho nto, yuav tsum tau ua ntej kev kho kom zoo dua qub kom txhim kho lub zog sib txuas ntawm txheej thiab muab cov txheej hauv qab conductive nrog lub zog sib txuas zoo rau plating.
Kev kho ua ntej ntawm txheej
Kev kho ua ntej suav nrog kev tshem cov roj ntawm qhov chaw yas, piv txwv li ntxuav cov roj thiab cov tshuaj tso tawm ntawm qhov chaw, thiab ua kom qhov chaw yas ua haujlwm, txhawm rau txhim kho qhov lo rau ntawm cov txheej.
1, Tshem roj
Kev tshem tawm roj ntawmcov khoom yasZoo ib yam li kev ntxuav cov khoom hlau, kev ntxuav cov khoom yas tuaj yeem ua tiav los ntawm kev ntxuav nrog cov kuab tshuaj organic lossis kev ntxuav nrog cov kua dej alkaline uas muaj surfactants. Kev ntxuav nrog cov kuab tshuaj organic yog qhov tsim nyog rau kev ntxuav paraffin, beeswax, rog thiab lwm yam av organic ntawm qhov chaw yas. Cov kuab tshuaj organic siv yuav tsum tsis txhob yaj, o lossis tawg cov yas, thiab nws muaj qhov kub qis, yog volatile, tsis muaj tshuaj lom thiab tsis kub hnyiab. Cov kua dej alkaline yog qhov tsim nyog rau kev ntxuav cov yas alkali-resistant. Cov kua muaj caustic soda, alkaline ntsev thiab ntau yam surfactants. Cov surfactant siv feem ntau yog OP series, piv txwv li alkylphenol polyoxyethylene ether, uas tsis tsim ua npuas ncauj thiab tsis nyob ntawm qhov chaw yas.
2, Kev ua kom nto
Qhov kev ua kom zoo no yog los txhim kho cov khoom ntawm cov yas, uas yog, los tsim qee pawg polar ntawm cov yas lossis kom nws ntxhib kom cov txheej txheej tuaj yeem yooj yim ntub thiab nqus tau ntawm qhov chaw ua haujlwm. Muaj ntau txoj hauv kev rau kev kho mob ua kom zoo ntawm qhov chaw, xws li kev ua kom tsis muaj zog, kev ua kom tsis muaj zog, kev ua kom tsis muaj zog thiab kev ua kom tsis muaj zog corona. Qhov siv dav tshaj plaws yog kev kho mob siv lead ua los ntawm cov tshuaj oxidation, uas feem ntau siv cov kua kho chromic acid, thiab nws cov mis ib txwm yog 4.5% potassium dichromate, 8.0% dej, thiab 87.5% concentrated sulfuric acid (ntau dua 96%).
Qee cov khoom yas, xws li polystyrene thiab ABS yas, tuaj yeem pleev xim ncaj qha yam tsis muaj kev kho oxidation tshuaj. Yuav kom tau txais cov txheej txheem zoo, kev kho oxidation tshuaj kuj tseem siv tau. Piv txwv li, tom qab degreasing, ABS yas tuaj yeem etched nrog cov kua kho chromic acid dilute. Nws cov mis kho mob ib txwm yog 420g / L chromic acid thiab 200ml / L sulfuric acid (qhov hnyav tshwj xeeb 1.83). Cov txheej txheem kho mob ib txwm yog 65 ℃ 70 ℃ / 5 feeb 10 feeb, ntxuav dej, thiab ziab. Qhov zoo ntawm etching nrog cov kua kho chromic acid yog tias txawm tias cov duab ntawm cov khoom yas nyuaj npaum li cas los xij, nws tuaj yeem kho tau sib npaug. Qhov tsis zoo yog tias kev ua haujlwm yog qhov txaus ntshai thiab muaj teeb meem ua qias tuaj.
Kev kho ua ntej ntawm cov txheej txheej
Lub hom phiaj ntawm kev kho ua ntej ntawm cov txheej txheej yog los txhim kho qhov kev sib txuas ntawm cov txheej rau ntawm qhov chaw yas thiab los tsim cov hlau conductive hauv qab ntawm qhov chaw yas. Cov txheej txheem ua ntej feem ntau suav nrog: kev siv tshuab roughening, tshuaj degreasing, tshuaj roughening, kev kho mob sensitization, kev kho mob activation, kev kho txo qis thiab tshuaj plating. Peb yam khoom thawj zaug yog los txhim kho qhov kev sib txuas ntawm cov txheej, thiab plaub yam khoom kawg yog los tsim cov hlau conductive hauv qab.
1 、 Kev ua kom ntxhib thiab kev ua kom ntxhib tshuaj lom neeg
Kev kho tshuab roughening thiab kev kho tshuaj roughening yog ua kom cov yas nto rougher los ntawm kev kho tshuab thiab kev kho tshuaj lom neeg, feem ntau kom nce thaj chaw sib cuag ntawm cov txheej thiab cov substrate. Feem ntau ntseeg tias lub zog sib txuas uas tuaj yeem ua tiav los ntawm kev kho tshuab roughening tsuas yog li 10% ntawm qhov ntawm kev kho tshuaj roughening.
2, Kev tshem tawm cov roj av
Txoj kev degreasing rau kev ua ntej ntawm cov yas txheej yog tib yam li txoj kev degreasing rau kev ua ntej ntawm cov txheej.
3、Kev Ua Rau Mob Siab
Kev ua kom rhiab heev yog kom nqus tau qee yam khoom yooj yim oxidized, xws li tin dichloride, titanium trichloride, thiab lwm yam, rau ntawm qhov chaw ntawm cov yas nrog qee qhov peev xwm adsorption. Cov khoom yooj yim oxidized no tau oxidized thaum lub sijhawm kho kom ua haujlwm, thiab tus activator raug txo kom ua cov catalytic crystal nuclei thiab tseem nyob ntawm qhov chaw ntawm cov khoom. Lub luag haujlwm ntawm kev ua kom rhiab heev yog los tso lub hauv paus rau cov txheej hlau plating tom ntej.
4, Kev Ua Kom Tiav
Kev ua kom muaj zog yog kho qhov chaw uas muaj kev cuam tshuam nrog kev pab los ntawm cov tshuaj uas muaj cov hlau sib xyaw ua haujlwm catalytic. Nws lub ntsiab lus yog muab cov khoom uas tau nqus nrog tus neeg sawv cev txo qis rau hauv cov kua dej uas muaj cov tshuaj oxidant ntawm cov ntsev hlau muaj nqis, kom cov hlau muaj nqis ions raug txo los ntawm S2 + n ua tus oxidant, thiab cov hlau muaj nqis txo qis raug tso rau ntawm qhov chaw ntawm cov khoom hauv daim ntawv ntawm cov khoom me me colloidal, uas muaj kev ua haujlwm catalytic muaj zog. Thaum qhov chaw no raug muab tso rau hauv cov tshuaj plating, cov khoom me me no dhau los ua chaw catalytic, uas ua rau cov tshuaj plating sai dua.
5, Kev kho mob txo qis
Ua ntej siv tshuaj plating, cov khoom uas tau qhib thiab ntxuav nrog dej huv raug muab tso rau hauv ib qho kev sib xyaw ntawm cov tshuaj txo cov tshuaj uas siv hauv tshuaj plating los txo thiab tshem tawm cov tshuaj tsis tau ntxuav. Qhov no hu ua kev kho kom txo qis. Thaum siv tshuaj tooj liab plating, cov tshuaj formaldehyde siv rau kev kho kom txo qis, thiab thaum siv tshuaj nickel plating, cov tshuaj sodium hypophosphite siv rau kev kho kom txo qis.
6, Tshuaj plating
Lub hom phiaj ntawm kev siv tshuaj plating yog los tsim cov zaj duab xis hlau conductive rau ntawm qhov chaw ntawm cov khoom yas los tsim cov xwm txheej rau electroplating cov txheej hlau ntawm cov khoom yas. Yog li ntawd, kev siv tshuaj plating yog ib kauj ruam tseem ceeb hauv kev siv tshuaj plating yas.
Lub sijhawm tshaj tawm: Lub Rau Hli-13-2024