Taw qhia: kev tsim khoom cov txheej txheem ntawm cov khoom lag luam yas tsuas yog muaj plaub qhov tseem ceeb: pwm kev kho, luam ntawv, luam ntawv, thiab kev sib dhos. Kev kho deg yog qhov tsis tseem ceeb, thiab cov txheej txheem pretricate yog qhov tseem ceeb los txhim kho cov nplaum ntawm cov nplaum thiab muab cov khoom ua haujlwm zoo underlayer rau plating. Kab lus no qhia luv luv piav txog cov txheej txheem tshwm sim saum npoo av rau cov khoom siv yas.
Nto pretreatment ntawm cov khoom siv yas feem ntau yog suav nrog txheej thiab plating kev kho mob. Feem ntau, plastics muaj siab crystallinity, qis lossis tsis muaj polarity, thiab qis lub zog qis, uas cuam tshuam cov nplaum ntawm cov txheej txheem.
Txij li cov plastics tsis yog -}}}}} Tsis tuaj yeem siv ncaj qha rau lawv cov chaw siv cov txheej txheem electroplating cov txheej txheem. Yog li no, tsim nyog pretriceators yuav tsum tau ua ua ntej kev kho kom zoo los txhim kho cov txheej nplaum kom zoo nkauj thiab muab cov underlayer nrog txoj kev ua kom zoo.
Pretricatment suav nrog cov roj yas me me, ntxuav cov roj, thiab kev kho kom zoo nkauj, lub hom phiaj yog los txhim kho cov nplaum nplaum.
01 degrees
Degreasing ntawm cov khoom yas. Zoo ib yam li Degretze cov khoom lag luam, cov khoom lag luam yas tuaj yeem yog kev siv cov tshuaj lom organic lossis alkaline cov kev daws teeb meem uas muaj surfactants. Organic cov kuab tshuaj yog qhov haum rau kev ntxuav cov paraffin ciab, beeswax, roj, thiab lwm yam organic av los ntawm cov yas. Cov kuab organic siv yuav tsum tsis txhob yaj, swell, lossis tawg cov yas; Nws yuav tsum muaj qhov cub npau npau tsawg, ua qhov tsis muaj zog, tsis - ua kom muaj kuab lom, thiab tsis {4 4}} pob.
Alkaline cov kev daws teeb meem yog qhov tsim nyog rau degreasing alkali - tiv taus plastics. Cov tshuaj no muaj caustic dej qab zib, cov ntsev ua kua qaub, thiab ntau yam surfactants. Qhov feem ntau siv surfactant yog Op series, piv txwv li, alkylphenol polyoxen ether, uas tsis tawm npaus thiab tsis tawm ntawm cov npoo av.
02 ua kom lub hom phiaj ua haujlwm rau kev ua haujlwm no txhawm rau txhim kho cov khoom siv kom ntub dej lossis ua kom muaj cov txheej txheem yas, ua cov pleev xim kom ntub thiab adsorb mus rau saum npoo ntawm ib feem. Muaj ntau txoj hauv kev ua kom muaj kev kho mob saum npoo av, nplaim taws oxidation, fine oxidation, daws vapor etching, thiab corona ou oxidation. Txoj kev siv siv tshuaj lom neeg feem ntau yog tshuaj lom neeg siv lead ua kev kho, uas nquag siv cov chromic acid tov. Cov qauv tsim yog 4.5% poov tshuaj Dichromate, 8.0% dej, thiab 87.5% concentrated sulfuric acid (96% lossis siab dua).
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 siab - Cov teeb ua zoo, kev kho tshuaj oxidation yog qee zaum siv. Piv txwv li, tom qab degreasing, AB ABS yas tuaj yeem etched nrog lub diluted chromic acid solligh. Ib txoj kev tsim yog 420 g / u chromic acid thiab 200 ml / l sulfuric acid (tshwj xeeb lub ntiajteb txawj nqus lub 1.83). Ib txoj kev kho mob ib txwm yog 65℃-70℃rau 5-10 feeb, ua raws li los ntawm yaug nrog dej thiab ziab. Qhov zoo ntawm Chromic acid etching yog tias nws tuaj yeem kho cov khoom siv cov roj hmab ntawm ntau yam duab tusyees. Nws qhov tsis zoo yog tias txoj haujlwm yog qhov txaus ntshai thiab muaj cov kuab paug.
Lub hom phiaj ntawm pretreatic ua ntej txheej yog txhawm rau txhim kho cov nplaum ntawm txheej thiab cov yas nto thiab ua kom muaj cov hlau nplaum hauv qab ntawm cov yas. Txheej txheem pretreatment feem ntau suav nrog: kev siv tshuab, tshuaj lom neeg siv tshuaj, kev ua kom zoo, kho kom zoo nkauj, thiab plev hluav taws xob plating. Thawj peb kauj ruam yog txhawm rau txhim kho cov nplaum ntawm txheej, thaum plaub kis tom kawg yog tsim cov qauv piav qhia ntawm cov hlau nplaum underlayer.
01 Mechanical thiab Tshuaj Lom Zem
Neeg kho tshuab thiab tshuaj lom neeg cov kev kho mob siv cov qauv tshuaj thiab siv tshuaj lom neeg, yog li nce thaj chaw sib cuag ntawm cov txheej thiab substrate. Nws yog feem ntau ntseeg hais tias kev sib raug zoo lub zog ua tiav los ntawm kev ntxhib txhua yam tsuas yog kwv yees li 10% ntawm qhov ua tiav los ntawm kev siv tshuaj lom neeg.
02 Tshuaj Txhuam degree
Cov txheej txheem qeeb rau cov txheej txheem yas ua ntej txheej yog tib yam li uas rau pretreatic ua ntej txheej.
03 sensitization
Qhov tsis zoo yuav cuam tshuam nrog adsorbing cov tshuaj ntsuab yooj yim, xws li tin dichloride thiab titanium trichhloride, mus rau saum npoo av, uas muaj qee yam muaj peev xwm adsorption. Cov adsorbed, yooj yim oxidized tshuaj yog oxidized thaum lub zog ua haujlwm, thaum tus activator yog txo rau catalytic nuclei, ntxiv rau ntawm cov khoom. Lub ntsej muag puas tau ua rau lub hauv paus rau cov roj electroless hlau plating.
04 ua kom muaj zog
Kev ua kom muaj zog koom nrog kev kho cov rhiab nrog kev daws teeb meem ntawm catalyticically cov hlau sib txuas. Qhov tseem ceeb, cov khoom muaj cov adsorbed txo tus neeg sawv cev yog raus hauv cov tshuaj aqueous ntawm cov oxidant muaj cov ntsev ntau. Cov hlau loj heev ions, ua yeeb yam li oxidants, yog txo los ntawm S²⁺n, thiab cov tsis muaj noble hlau hais txog cov khoom sib xyaw nrog cov kev ua kom muaj zog catalytic. Thaum cov nplaim hluav taws no tso rau hauv electroless plating tov, cov lus no ua catalalytic Chaw Chaw Nruab Nrab, nrawm nrawm ntawm electroless plating cov nyom.
05 Txo Kev Kho Mob
Ua ntej Electroless plating, cov khoom siv tau zoo yog muab tso rau hauv cov neeg siv hluav taws xob uas muaj roj hluav taws xob rau tshem tawm cov khoom seem uas tseem tshuav. Qhov no yog hu ua kev kho kom txo qis. Rau tooj liab electroless plating, formaldehyde tov yog siv rau kev kho kom txo qis; Rau Nickel Electroless plating, Sodium Hypophosphaphite daws tau cov khoom siv yas, tsim kom muaj cov khoom siv yas, tsim kom muaj cov khoom siv hlau sib xyaw ua ke, tsim kom muaj cov khoom siv hlau ua plating hlau yog tsim cov khoom siv hlau ua plating hlau Yog li, tshuaj txhuam plating yog cov kauj ruam tseem ceeb hauv yas electroplating.
