Qhov zoo thiab kev phom sij ntawm ib txwm Hexavalent Chromium Passivation txheej txheem rau Electroplating Hluav taws xob cua sov Tubes

Qhov zoo thiab kev phom sij ntawm ib txwm Hexavalent Chromium Passivation txheej txheem rau Electroplating Hluav taws xob cua sov Tubes

Cov txheej txheem hexavalent chromium passivation muaj ntau yam zoo, xws li kev tiv thaiv corrosion siab, kev kho tus kheej muaj peev xwm ntawm nws tus kheej kho corrosion kuj, thiab muaj peev xwm ua kom yooj yim passivate nyiaj dawb, xiav dawb, ntau xim, tub rog ntsuab, dub thiab lwm yam xim. Cov khoom siv raw yog los ntawm ntau qhov chaw thiab muaj nqis. Txawm li cas los xij, hexavalent chromium yog cov kab mob carcinogen thiab muaj teeb meem loj rau ib puag ncig thiab tib neeg kev noj qab haus huv.

1.2 Ceev ceev ntawm trivalent chromium passivation

Cov European Union tau kos npe rau tsab cai lij choj hauv Brussels xyoo 2003, uas txwv tsis pub siv hexavalent chromium hauv cov khoom siv tsheb thiab cov khoom siv txij lub Ib Hlis 1, 2003. Raws li tsab cai lij choj, cov ntsiab lus ntawm hexavalent chromium ntawm txhua lub tsheb tsis pub dhau 2g [1]. Thaum Lub Yim Hli 14, 2004, EU's "Electronic Waste Treatment Law" tau tshaj tawm, thiab thaum Lub Yim Hli 13, 2005, txoj cai no yuav pib siv. Txoj cai lij choj no yog raws li ob tsab cai lij choj EU ntawm xyoo 2002. Ob qho lus qhia no yog "Cov Lus Qhia rau Cov Khoom Siv Hluav Taws Xob thiab Hluav Taws Xob" (WEEE) thiab "Cov Lus Qhia Txog Kev Txwv Tsis Pub Siv Cov Khoom Siv Hluav Taws Xob thiab Hluav Taws Xob" (ROHS), uas yuav tsum tau cov tswv cuab los xyuas kom meej tias cov khoom siv hluav taws xob thiab hluav taws xob tshiab tau muab tso rau hauv kev lag luam txij Lub Xya Hli 1, 2006 tsis muaj rau 6 yam tsis zoo, xws li txhuas, mercury, cadmium, hexavalent chromium, polybrominated diphenyl ether, thiab polybrominated biphenyl. Txoj cai lij choj kuj tau teev tseg tias txhua lub laptops, desktop computers, printers, CPUs, motherboards, nas, keyboards, mobile phones, thiab lwm yam uas tsim thiab muag hauv EU lag luam yuav tsum tsim kom muaj kev faib ua tiav, rov ua dua, rov ua dua, thiab rov ua dua ua ntej lub Yim Hli 13, Xyoo 2005, thiab ris lub luag haujlwm rau cov khoom siv rov ua dua tshiab. Tuam Tshoj cov tuam txhab tsim khoom lag luam yuav tsum tsis txhob siv cov txheej txheem hexavalent chromium passivation tom qab Lub Yim Hli 13, 2004.

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