Brass yog paub tias yog cov khoom siv tooj liab ntau heev. Leaded tooj dag yog ib qho ntawm feem ntau siv. Leaded tooj dag yog tsim los ntawm tooj liab-zinc alloys nrog me me ntawm cov hlau lead thiab tsawg dua cov ntsiab lus, thiab cov ntsiab lus txhuas feem ntau yog nruab nrab ntawm 2% thiab 4%.
Lead tooj dag muaj kev ua haujlwm zoo heev, hnav tsis kam thiab lub zog siab, thiab feem ntau yog siv nyob rau hauv ntau yam txuas, li qub thiab valve qia bearings hauv mechanical engineering. Ntawm lawv, kub forging valve blanks, xauv kev lag luam thiab moos kev lag luam yog peb lub lag luam tseem ceeb. Cov hmoov txhuas txhuas yog tus nqi qis, nws cov hlau alloy muaj peev xwm ua kom haum rau ntau yam ntawm cov khoom siv alloying, thiab cov ntsiab lus yuav tsum tau xoob, tso lub hauv paus rau kev siv cov khoom siv tooj liab alloy raw khoom. Txawm li cas los xij, vim tias cov hmoov txhuas muaj qee qhov kev toxicity, ua cov hlau lead hauv kev tiv thaiv ib puag ncig, kev noj qab haus huv tau raug txwv rau qee yam.
Thiab cov hlau lead-dawb ib puag ncig tiv thaiv tooj liab tsis yog txhuas-dawb, tab sis hais txog cov ntsiab lus ntawm cov hlau lead tsawg heev. Raws li kev tiv thaiv ib puag ncig thoob ntiaj teb, cov hlau tsis muaj hlau lead yog maj mam hloov cov tooj dag txhuas nrog kev ua haujlwm zoo dua thiab kev ua haujlwm txiav.
Cov tooj liab tsis muaj hlau lead yog siv dav hauv cov khoom siv hluav taws xob, khoom siv hluav taws xob, khoom siv huv huv, li qub, watches, khoom siv hluav taws xob, xauv, khoom siv kho mob, cov khoom ua si menyuam yaus thiab lwm yam lag luam.
Feem ntau hais lus, cov ntsiab lus txhuas ntawm tooj dag siv hauv ntau qhov chaw yuav tsum ua raws li cov qauv hauv qab no:
1, Cov khoom siv hluav taws xob thiab tsheb: cov hlau lead Pb cov ntsiab lus ntawm tooj liab yog tsawg dua 0.4%;
2, cov khoom siv tu cev thiab ntau yam li qub: tooj liab hlau lead Pb cov ntsiab lus tsawg dua 0.25%;
3, American Copper Industry Association: cov hlau lead Pb cov ntsiab lus ntawm tooj liab yog tsawg dua 0.09%;
4, Asmeskas kev lag luam hluav taws xob: tooj liab hlau lead Pb cov ntsiab lus tsawg dua 0.01%;
Yuav kom ua tiav, dab tsi yog qhov sib txawv ntawm cov hlau lead-dawb tooj dag thiab txhuas tooj dag?
1, kev sib xyaw ua ke:
Cov tooj liab tsis muaj txhuas feem ntau suav nrog tooj liab, zinc, npib tsib xee, tin thiab lwm yam khoom, nws qhov sib piv sib txawv, kev ua tau zoo sib txawv, cov ntsiab lus txhuas feem ntau tsawg dua 0.5%.
Leaded tooj dag, ntawm qhov tod tes, yog ib qho alloy ntawm tooj liab sib xyaw nrog qee qhov feem ntawm zinc thiab txhuas, thiab cov ntsiab lus txhuas feem ntau yog 2% thiab 4%.
2. Ib puag ncig sib txawv
Cov hmoov txhuas yuav ua rau muaj kev phom sij rau ib puag ncig thiab tib neeg kev noj qab haus huv, thiab cov hlau lead-dawb tooj dag tsis muaj qhov teeb meem no, yog li hauv kev tiv thaiv ib puag ncig, kev noj qab haus huv thiab lwm yam ntawm kev ua haujlwm zoo dua.
3. Qhov sib txawv ntawm corrosion kuj
Cov tooj dag tsis muaj txhuas muaj oxidation thiab corrosion kuj zoo dua li cov hlau lead. Hauv qee qhov chaw ua haujlwm tshwj xeeb, xws li dej tsis zoo, kev siv cov kav dej tsis muaj hlau lead, li qub thiab lwm yam yuav tsim nyog dua.
4. Kev ua haujlwm sib txawv
Kev ua tau zoo ntawm cov hlau lead yog zoo heev, yooj yim casting, tuaj yeem tsim los ntawm extrusion, stamping thiab lwm yam kev ua. Cov tooj dag tsis muaj txhuas muaj zog dua thiab hardness, tab sis nws cov nqi tsim khoom feem ntau yog siab dua li cov hlau lead.
5, Daim ntawv thov
Cov tooj dag tsis muaj txhuas yog siv dav hauv cov haujlwm muaj feem xyuam nrog qee qhov kev xav tau ntawm kev tiv thaiv ib puag ncig, xws li cov dej haus, dej kub, khoom siv cua txias, cov khoom ua si menyuam yaus thiab lwm yam.
Leaded tooj dag feem ntau yog siv rau hauv kev lag luam ntawm cov xauv, xov tooj cua, hluav taws xob fittings thiab kev tsim tsheb. Nrog rau kev txhim kho ntawm kev tiv thaiv ib puag ncig kev nco qab, txawm tias siv cov tooj dag txhuas rau kev tsim cov dej haus, cov dej kub thiab lwm yam tau raug txwv hauv ntau lub tebchaws.
Raws li qhov tshwm sim, muaj qee qhov sib txawv ntawm cov hlau tsis muaj hlau lead thiab cov hlau lead ua tooj dag nyob rau hauv cov ntsiab lus ntawm kev muaj pes tsawg leeg, kev tiv thaiv ib puag ncig, kev tiv thaiv corrosion thiab kev ua haujlwm. Lead-free tooj dag muaj kev ua tau zoo dua hauv kev tiv thaiv ib puag ncig thiab lwm yam, thaum cov tooj dag txhuas muaj kev ua haujlwm zoo dua. Thaum xaiv cov khoom siv tooj dag, kev xaiv yuav tsum yog raws li kev siv ntawm ib puag ncig thiab cov yam ntxwv ntawm kev ua haujlwm.
Txawm koj xav taucov kav dej tooj liab, tooj liab rods ,tooj liab daim hlau, peb muaj cov khoom thiab kev txawj ntse kom tau raws li koj xav tau.
