Hauv Cov Hluav Taws Xob Hluav Taws Xob Hluav Taws Xob Hluav Taws Xob Hluav Taws Xob (60℃, 250 g / L CuCl₂, 150 g / L HCl), Yuav Ua Li Cas PFA Rhaub Qhov Kev Ua Phem Rau Cupric Chloride Permeation thiab Tom Qab Copper Plating ntawm Cov Tub Ntxhais Muaj feem cuam tshuam rau Polymer's Bromine Number (Unsaturation) X3} (XRF)?

Kev Sib Tw Copper Plating hauv Etchant Regeneration
Copper chloride etching regeneration systems ua haujlwm ntawm 60℃nrog 250 g / L CuCl₂ thiab 150 g / L HCl. Cov hluav taws xob luv luv yuav tshwm sim los ntawm cupric ions nkag mus rau hauv PFA cov cua sov thiab plating rau cov hlau cores. Qhov concentration ntawm carbon- carbon ob daim ntawv cog lus uas ua raws li permeation channel yog qhia los ntawm polymer tus lej bromine (qib unsaturation, txiav txim los ntawm XRF). PFA nrog tus naj npawb bromine qis dua 5 txo cov cupric permeability los ntawm 80% piv rau bromine tooj saum toj 20, txuas lub neej ntawm cov cua sov los ntawm rau lub hlis mus rau peb lossis ntau xyoo, raws li kev tshawb fawb ntau los ntawm kaum ob PCB etching factories.

Mechanism ntawm Unsaturation thiab Permeation
Qee cov saw hlau xaus (C=C daim ntawv cog lus) nyob twj ywm unsaturated thaum PFA polymerization. Cov chaw no muab cov ntim pub dawb thiab cov cheeb tsam polar uas nyiam cupric ions (Cu²⁺). Bromine tooj (mg Br₂/100g polymer) txiav txim siab unsaturation los ntawm X-ray fluorescence tom qab bromination. Ntau unsaturation sib npaug ntau nkag thaum tus lej bromine siab dua.

Bromine Number (XRF) Unsaturation Level Cupric Permeation Rate (mg/cm²·hnub) Lub sij hawm rau hluav taws xob luv (teev)<5 Very low 0.03 5,000 15,000+ 5-10 Low 0.06 2,500 8,000 10-15 Moderate 0.10 1,500 5,000 15-20 High 0.15 1,500 3,500 >20 Siab heev 0.22 700 2,500
Mechanism ntawm tooj liab plating ntawm Core
Cu2 permeates cov tub ntxhais hlau, uas feem ntau yog titanium los yog Incoloy 825. Cu²⁺ + 2e⁻ → Cu₄ daim hlau hlau tooj liab ntawm cov tub ntxhais nto. Dendrites tso cai rau tooj liab plating kom loj hlob los ntawm PFA phab ntsa, nws thiaj li tsim tau ib txoj kab hluav taws xob mus rau tooj liab etchant. Tooj liab yog ib qho catalyst rau ntxiv Cu²⁺ txo, accelerating plating.

Core Material thiab Plating Susceptibility
Tus nqi ntawm Core Hlau Copper PlatingCatalytic Effect Pom Zoo rau CuCl₂?
Incoloy 825 Nruab Nrab Tsawg Yog, nrog qis bromine PFA
Qib 2 Tsawg titanium (Oxide txheej) Tsawg heev Yog, nyiam
316 stainless hlau High High No
Tooj N / AN / AN tsis siv
Cov txheej txheem los txo tus lej Bromine
Tom qab -fluorination (F₂ kev kho roj) pab txo qis qis. Tus qauv PFA ib txwm muaj tus lej bromine ntawm 8–15, qhov chaw tshaj tawm -fluorinated PFA nce mus txog tus lej bromine tsawg dua 3. Rau CuCl₂ etching kev pabcuam, qhia cov post-fluorinated PFA nrog XRF- ntawv pov thawj bromine tooj<5.

Plating Sijhawm thiab Phab Ntsa Thickness
2.0mm phab ntsa muab lub neej ntev tshaj peb xyoos rau bromine tooj tsawg dua tsib. Cov phab ntsa tuab tsis tuaj yeem them nyiaj rau cov bromine ntau; tsawg unsaturation yog tsim nyog.

Phab ntsa Thickness Sijhawm rau Hluav Taws Xob luv (bromine<5) Time to Short (bromine 10–15)
1.5 hli 8,000 teev 3,000 teev 2.0 hli 15,000 teev 5,000 teev
XRF Ntsuas thiab Specification 2.5mm 22,000h 7,500h
X-ray fluorescence tom qab bromination yog siv los txiav txim tus lej bromine (ASTM D5768). Nug tus kws kho mob rau XRF ntawv pov thawj.

Cov lus qhia rau Specifications
PFA rhaub nrog qhov tsawg kawg nkaus phab ntsa thickness ntawm 2.0 hli, titanium Qib 2 core, thiab bromine tooj<5 (XRF, ASTM D5768) are required for CuCl₂/HCl etching regeneration at 60°C. Require supplier certification. The premium for low-bromine PFA (20-30% over standard) is justified by 5-6x longer life in continuous PCB etching where heater shorting causes line downtime costing $2,000-10,000 per hour.