IHalogens kwi-bipheny ene-polychlorinated

Ukuba ubuza uninzi lwabayili kuyilo lwezinto ze halogen kwifayile ye- PCB zifunyenwe, akuthandabuzeki ukuba bangakuxelela. IiHalogen zihlala zifumaneka kwi-brominated flame retardants (BFR), izinyibilikisi ezineklorin kunye ne-polyvinyl chloride (PVC). I-Halogen ngokucacileyo ayinabungozi ngandlela zonke, kwaye akukho ngxaki zempilo ngokubamba imibhobho ye-PVC okanye amanzi okusela empompo. Ukuba ubunokuyitshisa loo tyhubhu kwaye ungenise irhasi yeklorini ekhutshwe xa kuphuka iplastiki, inokuba libali elahlukileyo. Le yeyona ngxaki iphambili kwii-halojeni kwi-elektroniki. Zingapapashwa ekupheleni komjikelo wobomi bePCB. Ke, uzifumana phi ngqo ii-halogens kwibhodi yesekethe?

Njengoko usazi, i-PVC ayisebenzisi kuphela ukubhobhoza, kodwa ikwacoca nocingo, kwaye ke kunokuba sisiseko se halogen. Isinyibilikisi esineklorin singasetyenziselwa ukucoca ii-PCBS ngexesha lokuvelisa. I-BFR isetyenziselwa ii-PCB laminates ukunciphisa umngcipheko webhodi yomlilo. Ngoku ekubeni sivavanye owona mthombo uphambili wee halogen kwisekethe, kufuneka senze ntoni ngayo?

IHalogen i-PCB yasimahla

Njengeemfuno ezisimahla zeRoHS, imigangatho yasimahla ye-halogen ifuna ukuba i-CM isebenzise izinto ezintsha kunye neendlela zokwenza. Njengawo nawuphi na umgangatho osemgangathweni “ongenayo i-halogen” obekwe yimibutho eyahlukeneyo. Inkcazo ye-IEC yee-halogen ayiqulathanga i-chlorine kunye ne-bromine engaphantsi kwe-900 PPM kunye ne-halogen iyonke engaphantsi kwe-1500 PPM, ngelixa i-RoHS inezithintelo zayo.

Ngoku kutheni ucaphula “ngaphandle kwe-halogen”? Kungenxa yokuba ukuhlangabezana nemigangatho akuthethi ukuba ibhodi yakho ayinasimahla. Umzekelo, i-IPC imisela iimvavanyo zokufumanisa ii-halogen kwi-PCBS, ezifumana ii-halogen ezi-bonded ionic. Nangona kunjalo, uninzi lwee halogen ezifumaneka kwi-flux ziboshwe ngokudibeneyo, ngoko ke uvavanyo alunakubafumana. Oku kuthetha ukuba ukwenza iphepha elingenalo i-halogen, kufuneka uhambe ngaphaya kweemfuno eziqhelekileyo.

Ukuba ujonga umthombo othile wee halogen, enye yi-TBBPA, eyi-BFR esetyenziswa rhoqo kwi-laminates. Ukuphelisa le ndawo yokuqala, kuya kufuneka uchaze ii-laminates ezingenazo i-halogen, ezinje ngee-laminates ezisisiseko se-phosphorus. I-flux kunye ne-solder yakho inokuzisa ii-halojeni kwi-PCB, ke kuya kufuneka uxoxe ne-CM ukuba zeziphi ezinye iindlela ezinokubakho apho. Kunokuba buhlungu ukusebenzisa izinto ezintsha kunye neetekhnoloji kwiibhodi, kodwa iisekethe ezingenasasazo zinezibonelelo ezithile. Ii-PCBS ze-Halogen ezingenasiseko ngokubanzi zinokuthenjwa okusasaza ubushushu, okuthetha ukuba zilunge ngakumbi kwiinkqubo ezinobushushu obuphezulu ezifunekayo kwiisekethi ezingenazikhokelo. Bahlala benemvume esezantsi ukuba ufuna ukugcina ukuthembeka kwesiginali.

Uyilo lwebhodi engenaHalogen

Izibonelelo zebhodi engena-halogen yeza ngexabiso lokunyuka kobunzima hayi kuphela kwinkqubo yokuvelisa kodwa nakwiyilo. Umzekelo olungileyo yi-halogen-free solders and fluxes. Iindidi ezingenaHalogen ngamanye amaxesha zinokutshintsha i-solder iye kwi-flux ratio kwaye zibangele ukukrwela. Kulapho i-solder idityaniswa khona kwibhola enkulu kunokusasazwa ngokudibeneyo. Enye indlela yokusombulula le ngxaki kukuchaza bhetele iphedi enefilimu ethintelayo. Oku kuya kugcina i-solder paste kwaye kunciphise iziphene.

Izinto ezininzi ezintsha zineempawu zazo zoyilo, kwaye unokufuna ukunxibelelana nomenzi okanye wenze uphando ngaphambi kokuzisebenzisa. Iibhodi ezingenaHalogen ziyanda, kodwa akunjalo kwindalo iphela. Kuya kufuneka uthethe ne-CM yakho ukubona ukuba banakho na ukwenza i-PCBS kwizixhobo zasimahla ze-halogen.

Njengoko ixesha lihamba, kubonakala ngathi izinto ezininzi esizisebenzisayo mihla le zinobungozi kuthi. Kungenxa yoko le nto imibutho efana ne-IEC iphuhlisa imigangatho yebhodi engena-halogen. Khumbula apho zihlala khona ii-halogen (i-BFR, isinyibilikisi, kunye nokugquma), ke ukuba ufuna i-halogen-free, uyazi ukuba zeziphi ii-halogen ezizokutshintsha. Imigangatho eyahlukeneyo ivumela amaxabiso ahlukeneyo e-halogen, kwaye iintlobo ezithile ze-halogen zinokufunyanwa okanye zingafunyanwa. Kuya kufuneka wenze uphando kwangaphambili ukuze uqonde indawo ekuyo ingxaki kwindawo ekuyo i-PCB. Nje ukuba wazi ukuba yeyiphi na into oza kuyisebenzisa, kungcono ujonge umenzi kunye ne-CM ukubona eyona ndlela ifanelekileyo yokuya phambili. Kuya kufuneka uhlengahlengise uyilo okanye usebenze kunye ne-CM kumanyathelo athile okuvelisa ukuqinisekisa ukuba ibhodi yakho igqityiwe ngempumelelo.