Cov electroplated qhov chaw ntawm hluav taws xob cua sov raj yuav tsum tau txo qis kev kho mob tom qab kho nrog ib tug ionic activation tov.

Cov electroplated qhov chaw ntawm hluav taws xob cua sov raj yuav tsum tau txo qis kev kho mob tom qab kho nrog ib tug ionic activation tov.

Txoj kev npaj ntawm kev daws yog:

Ua ntej, yaj cov chromic anhydride hauv dej, do thiab ncuav nyob rau hauv sulfuric acid, thiab thaum kawg ntxiv dej rau lub ntim yuav tsum tau. Chromic anhydride yuav tsum tsis txhob muab ntxiv rau sulfuric acid kom tiv thaiv kev tawg tsis tiav.

Ntxiv nrog rau qhov yuav tsum tau ua kom lub ntsej muag kom ntub dej tag nrho, kev tshuaj xyuas ntawm roughening zoo kuj tuaj yeem txiav txim los ntawm cov tsos, raws li qhia hauv cov lus hauv qab no:

Deg nta ntawm coarsening degree

Tsis txaus coarsening, du thiab glossy nto, zoo xav txog ntawm lub teeb muaj zog

Coarsening yog tsim rau qhov chaw uas tsaus me ntsis, du, tab sis tsis muaj kev cuam tshuam

Me ntsis dhau roughened, nto visibly darkened, tab sis tseem du

Ntau coarsening nrog ib tug dawb fluffy nto

Loj coarsening, ntau nto tawg, thiab looseness

Ntxiv cov tin tuav lossis cov khoom rau cov tshuaj tuaj yeem ncua sijhawm oxidation ntawm divalent tin. Tsis tas li ntawd, divalent tin kuj nquag tsim Sn (OH) Cl precipitates. Thaum dawb precipitates tsim nyob rau hauv cov tshuaj, hydrochloric acid tuaj yeem ntxiv. Yog tias nws tseem tsis tuaj yeem paub meej, nws yuav tsum tau lim.

Thaum npaj cov tshuaj, nws yog ib qhov tsim nyog yuav tau siv cov dej deionized thiab reagents los npaj cov tshuaj. Txoj kev yog kom yaj stannous chloride hauv hydrochloric acid aqueous kua. Nws tsis raug tso cai rau yaj stannous chloride hauv dej ua ntej ntxiv rau hydrochloric acid, txwv tsis pub stannous chloride yuav hydrolyze.

7) Kev ua haujlwm:

Kev kho kom ua kom muaj zog yog tsim cov catalytic active hlau txheej rau saum npoo ntawm ib feem, ua kom cov tshuaj plating tshwm sim spontaneously.

Silver nitrate (AgNO2) 1-32-530-90

Potassium chloride palladium (PaCl2) 0 2-0.50 25-1.50 3-0.5

Chloroauric acid (HAuCl4 · 4H2O) 0 5-1

Ammonia dej (NH3 · H2O) 25 feem pua ​​7-10ml/L6-8ml/L20-100ml/L

Ammonium chloride (NHCl) 0 2-0.5

Hydrochloric acid HCl37 feem pua ​​3-10ml/L0 25-1.0ml/L10ml/L

Boric acid (H3BO3) 20

Tus neeg saib xyuas kev sib tw (HD-1) 3-5

Temperature degree Chav tsev kub qhov kub thiab txias 20-4020-4020-4020-40

Sijhawm (min) 3-55-100 5-51-50 5-52-52-51-5

Lub palladium chloride activation tov nyob rau hauv cov lus saum toj no muaj catalytic kev ua si ntawm npib tsib xee plating, tooj liab plating, thiab lwm yam., thiab cov tshuaj no kuj ruaj khov, yog li nws yog dav siv. Thaum siv, cov tshuaj yuav maj mam ua qias neeg thiab dub, thiab tseem tuaj yeem siv tom qab pom. Thaum cov ntsiab lus palladium ion txo qis, nws yuav tsum tau muab ntxiv raws sijhawm. Ua kom qhov kub thiab txias tuaj yeem txhim kho qhov ua kom muaj zog.

8) Tom qab kho nrog cov tshuaj ionic activation, cov khoom yuav tsum tau txo qis kev kho mob txhawm rau txhim kho cov kev ua haujlwm catalytic ntawm qhov chaw thiab ua kom cov nyiaj tso tawm ntawm cov tshuaj plating. Nyob rau tib lub sijhawm, nws tseem tuaj yeem tshem tawm cov kev ua kom seem ntawm qhov chaw ntawm qhov chaw, tiv thaiv nws los ntawm kev nkag mus rau hauv cov tshuaj plating thiab ua rau cov tshuaj decomposition.

Kev txo qis kev kho ntawm palladium chloride activation yog ua nyob rau hauv ib qho kev daws ntawm 10-30g/L sodium hypophosphate ntawm chav tsev kub rau 10-30S. Rau kev ua kom cov tshuaj formula 6, ib qho kev daws ntawm 2 feem pua ​​-5 feem pua ​​(ntim) hydrazine hydrate yog siv los so ntawm 10-40 degree rau 3-5 feeb.

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