Kev ceev faj tseem ceeb rau cov txheej txheem yas electroplating ntawm hluav taws xob cua sov raj:

Kev ceev faj tseem ceeb rau cov txheej txheem yas electroplating ntawm hluav taws xob cua sov raj:

1. Nyob rau hauv ib txwm catalytic tov, txo cov palladium ions los ntawm stannous chloride cov ntaub ntawv colloidal palladium thiab stannic acid colloid. Lub sijhawm no, stannic acid colloid yog lub cev tiv thaiv ntawm palladium, ua rau cov tshuaj colloidal palladium ua kom ruaj khov. Nco ntsoov tuav ib qho dhau ntawm cov tin ions thiab txaus acidity.

2. Qhov siab dua acidity, qhov kev ua haujlwm zoo dua (HCl: 250ml/L-300ml/L). Thaum tus nqi pH siab tshaj 2, stannous chloride tau yooj yim hydrolyzed rau hauv tetravalent tin thiab tin hydroxide, ua rau cov tshuaj pos huab thiab dawb, thaum kawg ua rau cov tshuaj plating decompose.

3. Qhov ntsuas kub qis dua, qhov kev ua haujlwm zoo dua (zoo dua tswj tau ntawm thaj tsam 25 degree).

4. Cov ntsiab lus chromium tsis tuaj yeem tshaj 500PPM, vim tias nws yuav cuam tshuam rau qhov tso nyiaj ntawm palladium ions thiab tuaj yeem yooj yim ua rau cov tshuaj plating decompose yog tias nws siab dhau.

5. Kev ua haujlwm tsis zoo ntawm cov tshuaj ua kom muaj zog thiab kev tu ntau dhau tom qab ua kom muaj zog tuaj yeem ua rau txo qis hauv kev sib khi quab yuam.

4, Kev tswj tsis raug yuav ua rau muaj kev cuam tshuam tsis zoo thiab cuam tshuam:

1. Cov acidity tsawg dhau tuaj yeem ua rau muaj kev ua haujlwm tsawg, uas tuaj yeem ua rau "tsis plam" hauv electroplating tsis zoo. Nws kuj tuaj yeem ua rau hydrolysis ntawm stannous chloride rau hauv tetravalent tin, ua rau cov tshuaj maj mam poob thiab thaum kawg ua rau cov khoom seem.

2. Cov kua qaub ntau dhau tuaj yeem ua rau muaj qhov tsis zoo ntawm hydrochloric acid, cuam tshuam rau huab cua hauv kev cob qhia, thiab ua rau muaj kev pheej hmoo tsis zoo rau cov khoom siv electroplating.

3. Kev ntxuav tsis zoo ua ntej rhiab heev ( zais "dej daj") tuaj yeem ua rau plating to ntawm qhov chaw dai lossis qhov muag qhov muag. Nws kuj tseem yuav ua rau cov tsub zuj zuj ntawm hexavalent chromium, thiab rau qee qhov, nws tseem yuav ua rau cov tshuaj plating yuav tsum tau muab pov tseg.

4. Yog tias lub sij hawm rhiab heev luv luv, nws yuav ua rau tsis txaus adsorption ntawm colloidal palladium thiab ua rau plating plating.

5. Yog tias lub sij hawm rhiab heev ntev, nws yuav ua rau plating tsis kam lossis plating ntawm cov plating fixture, cuam tshuam rau cov plating zoo.

6. Ua tib zoo saib xyuas qhov cua hauv chav ua haujlwm kom tiv thaiv kev tsim "chromium pos huab" hauv huab cua. Yog tias muaj "chromium pos huab", yuav tsum muaj cov pob dub uas xau plating.

7. Sensitizing potions yuav tsum tau sim rau lawv cov dej num, txwv tsis pub cov dej palladium tuaj yeem ua tiav cov txiaj ntsig zoo electroplating.

5, Cov lus qhia tshwj xeeb:

1. Cov txheej txheem ntawm "neutralization" thiab "pre impregnation" tau raug tshem tawm ua ntej sensitization;

2. Lub hom phiaj tseem ceeb ntawm neutralization thiab pre leaching yog tshem tawm hexavalent chromium kom ntau li ntau tau thiab txo cov kev taw qhia ntawm hexavalent chromium.

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