Txheej txheem khiav ntawm PCB multilayer board

1 Txheej txheem ntws

The printed circuit board with the prepared graphics → acid degreasing → scanning water washing → secondary countercurrent water washing → micro-etching → scanning water washing → secondary countercurrent water washing → copper plating predip → copper plating → scanning water washing → tin plating predip → Tin plating → secondary countercurrent washing → lower plate

2 cov txheej txheem ntxaws

2.1 Tin Plating Prepreg

2.1.1 Kev sib xyaw thiab kev ua haujlwm ntawm tin-plating ua ntej-dip

2.1.2 Txoj kev qhib lub tin prepreg tank 4

Ua ntej ntxiv ib nrab lub tog raj kheej ntawm cov dej distilled, ces maj mam raus thiab ntxiv 15L sulfuric acid nrog ib tug loj feem ntawm 98 feem pua, do thiab txias, ntxiv 1.5L Sulfotech Part A, do tusyees, ntxiv dej distilled rau 300L, do tusyees, thiab nws. yog npaj siv.

2.1.3 Kev tu thiab tswj cov tin-plating ua ntej-soak da dej

Ntxiv 1L sulfuric acid thiab 100mL Sulfotech Part A rau txhua 100m2 board. Hloov da dej txhua zaus da dej tau ua tiav 1500m2 ntawm daim phiaj.

2.2 Tin plating

2.2.1 Kev sib xyaw thiab kev ua haujlwm ntawm tin plating tov 5

2.2.2 Txoj kev qhib lub tinning tank 2

Ua ntej ntxiv ib nrab lub tog raj kheej ntawm cov dej distilled, ces maj mam ntxiv 98L sulfuric acid nrog ib feem ntawm 98 feem pua, tom qab nplawm thiab txias, ntxiv 40kg Tin Salt 235 kom txias rau 25 degree, ntxiv 76 L Sulfotech Part A, 15.2 L Solfotech Part. B, 30.4 LSTHAdditive Sulfolyt, Ntxiv dej distilled rau cov kua theem thiab circulate (electrolyze 2AH / L ntawm 1.5A / dm2).

2.2.3 Kho thiab tswj cov tin plating da dej kua

Tshawb xyuas cov tin thiab sulfuric acid ua ntej ua haujlwm. 11L sulfuric acid, 600 g Tin Salt 235, 600 mL Sulfotech Part A, 800 mL Sulfotech Part B, 750 mL STH Additive Sulfolyt yuav tsum tau ntxiv rau txhua 100m2 phaj. Tsis siv neeg ntxiv qhov system ntxiv 56mL ntawm Sulfotech Part A ntawm 200AH.

Qhov kev daws teeb meem yuav tsum raug kuaj xyuas Hull cell txhua lub lim tiam los soj ntsuam thiab kho Sulfotech Part A thiab Sulfotech Part B.

Yam khoom Scope Zoo tshaj tus nqi

Sn2 ntxiv 20-30 mL/L 24 mL/L

W (H2SO4) yog 98% 160-185mL/L 175mL/L

Sulfotech Part A (Sulfotech Part A) 30-60mL/L 40mL/L

STH (STH Additive Sulfolyt) 30-80mL/L 40mL/L

Sulfotech Part B 15-25mL/L 20mL/L

Ua haujlwm kub 18-25 ° C 22 ° C

Cathode tam sim no ceev 1.3-2.ASD 1.7ASD 2