① Degreasing
1. Muaj nuj nqi: Tshem tawm cov roj roj stains thiab lwm cov organic av ntawm cov khoom siv kom tau txais cov nyhuv electroplating zoo thiab tiv thaiv kev ua qias tuaj rau cov txheej txheem tom ntej.
2. Kev tswj qhov kub thiab txias: 40 ~ 60 ℃
3. Mechanism ntawm kev ua:
Nrog kev pab ntawm saponification thiab emulsification ntawm kev daws, lub hom phiaj ntawm kev tshem cov roj stains tuaj yeem ua tiav.
Kev tshem tawm ntawm cov tsiaj thiab zaub roj yog ua raws li cov tshuaj tiv thaiv saponification.Lub npe hu ua saponification yog cov txheej txheem ntawm cov tshuaj tiv thaiv ntawm cov roj thiab cov alkali hauv cov kua degreasing los tsim cov xab npum.Cov roj uas yog Ameslikas insoluble hauv dej yog decomposed rau hauv xab npum thiab glycerin uas yog soluble hauv dej, thiab ces tshem tawm.
4. Cov teeb meem xav tau kev saib xyuas:
1) Ultrasonic oscillation tuaj yeem txhim kho cov nyhuv degreasing.
2) Thaum lub concentration ntawm degreasing hmoov tsis txaus, cov nyhuv degreasing tsis tuaj yeem ua tiav;thaum cov concentration siab dhau lawm, qhov poob yuav ntau dua thiab tus nqi yuav nce ntxiv, yog li nws yuav tsum tau tswj hwm hauv qhov tsim nyog.
3) Thaum qhov kub tsis txaus, cov nyhuv degreasing tsis zoo.Ua kom qhov kub thiab txias tuaj yeem txo qhov nro ntawm cov tshuaj thiab roj thiab ua kom cov nyhuv degreasing;Thaum qhov kub thiab txias siab dhau lawm, cov khoom yuav ua rau deformation.Qhov kub thiab txias yuav tsum tau tswj nruj me ntsis thaum ua haujlwm.
4) Tom qab cov txheej txheem degreasing, qhov saum npoo ntawm cov khoom yuav tsum tau wetted kiag li.Yog tias muaj kev pom tseeb ntawm cov dej ntws tawm thiab cov khoom siv sib cuam tshuam, nws txhais tau tias kev ua haujlwm tsis tau raws li qhov yuav tsum tau ua.Rov ua qhov kev ua haujlwm thiab kho qhov tsis raws sijhawm.
② o
Mechanism ntawm kev ua:
Tus neeg sawv cev o nthuav tawm cov khoom ua haujlwm kom ua tiav qhov micro-corrosion, thaum softening cov khoom nws tus kheej, tso cov kev ntxhov siab tsis sib xws los ntawm kev txhaj tshuaj molding lossis cov khoom siv, yog li cov txheej txheem roughening tom ntej tuaj yeem sib npaug thiab zoo corroded.
Cov txheej txheem ntawm kev txheeb xyuas qhov kev ntxhov siab sab hauv ntawm cov khoom siv electroplating yuav txawv rau cov khoom sib txawv.Rau ABS, txoj kev glacial acetic acid dipping feem ntau yog siv.
③ Coarsening
1. Kev tswj qhov kub thiab txias: 63 ~ 69 ℃
2. ABS yas yog terpolymer ntawm acrylonitrile (A), butadiene (B) thiab styrene (S).Thaum lub sij hawm roughening txheej txheem, cov yas hais muaj nyob rau hauv lub pits, ua rau lub nto hydrophobic rau hydrophilic, thiaj li hais tias lub plating txheej adheres rau cov yas ib feem thiab ruaj khov.
Cov kev ceev faj:
1) High chromium tov muaj ceev melting thiab coarsening ceev thiab zoo txheej adhesion;tab sis thaum tus nqi ntawm chromic acid thiab sulfuric acid ntau dua 800 g / L, cov tshuaj yuav ua kom dej nag, yog li nws yuav tsum tau ua kom cov roj sib tov.
2) Thaum cov concentration tsis txaus, cov nyhuv coarsening tsis zoo;thaum lub concentration siab dhau lawm, nws yog ib qho yooj yim rau over-coarse, puas cov khoom, thiab coj tawm loj poob thiab nce nqi.
3) Thaum qhov kub thiab txias tsis txaus, cov nyhuv roughening tsis zoo, thiab thaum kub siab dhau, cov khoom yuav ua rau deformation.
④Neutralization (lub ntsiab tivthaiv yog hydrochloric acid)
1. Kev ua haujlwm: Ntxuav cov hexavalent chromium uas tseem tshuav hauv cov micropores ntawm cov khoom tom qab roughening thiab corrosion los tiv thaiv cov pa phem rau cov txheej txheem tom ntej.
2. Mechanism ntawm kev txiav txim: Thaum lub sij hawm roughening txheej txheem, cov khoom siv roj hmab yog yaj mus, tsim cov pits, thiab yuav muaj roughening kua nyob rau hauv.Vim hais tias hexavalent chromium ion nyob rau hauv cov kua roughening muaj zog oxidizing zog, nws yuav ua paug rau cov txheej txheem tom ntej.Hydrochloric acid tuaj yeem txo nws mus rau trivalent chromium ions, yog li poob oxidizing zog.
3. Cov teeb meem xav tau kev saib xyuas:
1) Hydrochloric acid yog ib qho yooj yim rau volatilize, roj nplawm tuaj yeem txhim kho qhov nruab nrab thiab ntxuav cov nyhuv, tab sis cov cua ntws tsis yooj yim kom loj dhau, kom tsis txhob poob ntawm hydrochloric acid volatilization.
2) Thaum cov concentration tsis txaus, cov nyhuv tu tsis zoo;Thaum cov concentration siab dhau lawm, qhov kev nqa tawm poob ntau dua thiab tus nqi nce.
3) Qhov kub nce tuaj yeem txhim kho cov nyhuv tu.Thaum qhov kub thiab txias dhau lawm, qhov volatilization poob yuav loj, uas yuav ua rau kom tus nqi thiab ua paug rau huab cua.
4) Thaum siv, trivalent chromium ions yuav sau thiab nce.Thaum cov kua yog tsaus ntsuab, nws txhais tau hais tias muaj ntau ntau trivalent chromium ions thiab yuav tsum tau hloov tsis tu ncua.
⑤ Ua kom (catalysis)
1. Muaj nuj nqi: Tso ib txheej ntawm colloidal palladium nrog catalytic kev ua si rau saum npoo ntawm cov khoom.
2. Mechanism ntawm kev txiav txim: cov polymers uas muaj cov pab pawg neeg nquag tuaj yeem tsim cov complexes nrog cov hlau ions muaj nuj nqis.
3. Ceev faj:
1) Tsis txhob do cov kua activating, txwv tsis pub nws yuav ua rau cov activator decompose.
2) Qhov kub thiab txias tuaj yeem ua rau cov nyhuv ntawm palladium sinking.Thaum kub siab dhau lawm, tus activator yuav decompose.
3) Thaum cov concentration ntawm cov activator tsis txaus, cov nyhuv palladium nag lossis daus tsis txaus;Thaum cov concentration siab dhau lawm, qhov kev nqa tawm poob yog loj thiab tus nqi nce.
⑥ Tshuaj nickel
1. Kev tswj qhov kub thiab txias: 25 ~ 40 ℃
2. Kev ua haujlwm: Muab cov txheej txheem hlau tsis sib xws rau ntawm qhov chaw ntawm cov khoom, kom cov khoom hloov ntawm cov khoom tsis yog tus neeg xyuas pib mus rau tus neeg xyuas pib.
3. Cov teeb meem xav tau kev saib xyuas:
1) Hypophosphorous acid yog ib qho kev txo qis rau nickel.Thaum cov ntsiab lus siab, lub deposition ceev yuav nce thiab lub plating txheej yuav tsaus, tab sis lub stability ntawm plating tov yuav tsis zoo, thiab yuav ua rau kom lub tiam tus nqi ntawm hypophosphite radicals, thiab cov plating tov yuav yooj yim rau decompose.
2) Raws li qhov kub thiab txias, qhov tso nyiaj ntawm cov tshuaj plating nce.Thaum qhov kub thiab txias siab dhau lawm, vim tias qhov tso nyiaj ntau dhau nrawm, cov tshuaj plating yog qhov ua rau nws tus kheej decomposition thiab cov tshuaj lub neej luv luv.
3) Tus nqi pH qis, cov tshuaj sedimentation ceev qeeb, thiab cov sedimentation ceev nce thaum pH nce.Thaum tus nqi PH siab dhau lawm, cov txheej txheej yog tso tawm sai heev thiab tsis ntom txaus, thiab cov khoom yuav raug tsim tawm.
Post lub sij hawm: Mar-27-2023