tsim nyog sau! Puas yog cov hlau tsis muaj hlau lead tiag tiag tsis muaj txhuas? Kawm qhov sib txawv ntawm cov hlau lead-dawb tooj liab rods thiab txhuas tooj dag rods nyob rau hauv ib tsab xov xwm
Raws li peb txhua tus paub, tooj dag yog cov khoom siv tooj liab ntau heev. Ntawm lawv, tooj dag txhuas yog hom siv dav tshaj plaws. Lead tooj dag feem ntau yog ua los ntawm tooj liab-zinc alloy nrog me me ntawm cov hlau lead thiab tsawg dua cov ntsiab lus. Cov ntsiab lus txhuas feem ntau yog nruab nrab ntawm 2% thiab 4%.
Muaj ntau ntau yam ntawm cov hlau lead, raws li qhia hauv cov lus hauv qab no:
| GB | ISO | ASTM | JIS | DIN | BS | NF |
| HPb89-2 | 一 | C31400 | 一 | 一 | 一 | 一 |
| HPb66-0.5 | 一 | C33000 | 一 | --- | 一 | 一 |
| HPb63-3 | 一 | C35600 | C3560 | CuZn36 Pb 3 | 一 | 一 |
| HPb63-0.1 | ---- | 一 | ---- | CuZn37Pb0.5 | 一 | 一 |
| HPb62-0.8 | CuZn37pb1 | C35000 | C3710 | CuZn36Pb1.5 | CZ123 | --- |
| HPb62-3 | CuZn36 Pb 3 | C36000 | C3601 | CuZn36 Pb 3 | CZ124 | CuZn36 Pb 3 |
| HPb62-2 | CuZn37 Pb 2 | C35300 | 一 | CuZn38Pb1.5 | CZ131 | CuZn35 Pb 2 |
| HPb61-1 | CuZn39pb1 | C37100 | C3710 | CuZn39Pb0.5 | CZ129 | CuZn40 Pb |
| HFb60-2 | CuZn38 Pb 2 | C37700 | C3771 | CuZn39pb 2 | CZ128 | CuZn38 Pb 2 |
| HPb59-3 | CuZn39pb3 | C38500 | C3561 | CuZn39pb3 | CZ120 | CuZn40pb 3 |
| HPb59-1 | CuZn39pb1 | C37710 | C3713 | CuZn40 Pb 2 | CZ129 | CuZn39Pb1.7 |
Common lead brass qib
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 kev lag luam, thiab saib kev lag luam yog peb lub lag luam tseem ceeb. Cov hmoov txhuas txhuas yog tus nqi qis, nws cov alloy muaj peev xwm muaj ntau yam ntawm cov ntsiab lus alloy, 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 muaj qee yam toxicity ntawm cov hlau lead, kev ua tau zoo ntawm cov hlau lead hauv cov ntsiab lus ntawm kev tiv thaiv ib puag ncig thiab kev noj qab haus huv yog nyob rau qee qhov kev txwv.
Lead-dawb ib puag ncig tus phooj ywg tooj liab tsis yog txhuas-dawb kiag li, tab sis txhais tau hais tias cov ntsiab lus txhuas tsis tshua muaj. Raws li kev tiv thaiv thoob ntiaj teb kev tiv thaiv ib puag ncig, cov hlau tsis muaj hlau lead yog maj mam hloov cov tooj liab uas muaj cov hmoov txhuas nrog kev ua haujlwm zoo dua thiab kev ua haujlwm txiav.
Cov hlau lead-dawb ib puag ncig tus phooj ywg tooj liab yog dav siv hauv electronics, nws pib qhov chaw, huv si, li qub, watches, khoom siv hluav taws xob, xauv, khoom siv kho mob, menyuam yaus cov khoom ua si 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 cov khoom siv pib: Cov hlau lead Pb cov ntsiab lus ntawm tooj liab alloy yog tsawg dua 0.4%;
2. Cov khoom siv huv huv thiab ntau yam li qub: cov hlau lead Pb cov ntsiab lus ntawm tooj liab alloy yog tsawg dua 0.25%;
3. American Copper Industry Association: Cov hmoov lead Pb cov ntsiab lus ntawm tooj liab alloys tsawg dua 0.09%;
4. US electronics kev lag luam: Cov hlau lead Pb cov ntsiab lus ntawm tooj liab alloy yog tsawg dua 0.01%;
Yuav kom xaus, dab tsi yog qhov sib txawv ntawm cov hlau lead-dawb tooj dag thiab txhuas txhuas?
1. Qhov sib txawv ntawm cov khoom xyaw:
Cov tooj dag tsis muaj txhuas feem ntau suav nrog tooj liab, zinc, npib tsib xee, tin thiab lwm yam khoom, nrog rau cov khoom sib txawv thiab cov khoom sib txawv. Cov ntsiab lus txhuas feem ntau tsawg dua 0.5%.
Lead tooj dag yog ib qho alloy tov nrog tooj liab thiab ib feem ntawm zinc thiab txhuas. Cov ntsiab lus txhuas feem ntau yog nruab nrab ntawm 2% thiab 4%.
2. Qhov sib txawv ntawm kev tiv thaiv ib puag ncig
Cov ntsiab lus txhuas yuav ua rau muaj kev phom sij rau ib puag ncig thiab tib neeg kev noj qab haus huv, tab sis cov hlau lead-dawb tooj dag tsis muaj qhov teeb meem no, yog li nws muaj kev ua tau zoo dua ntawm kev tiv thaiv ib puag ncig thiab kev noj qab haus huv.
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 cov chaw uas muaj dej tsis zoo, nws yuav tsim nyog siv cov kav dej tsis muaj hlau lead, li qub thiab lwm yam.
4. Qhov sib txawv ntawm kev ua haujlwm
Cov txhuas txhuas muaj cov khoom ua haujlwm zoo heev, yooj yim rau cam khwb cia, thiab tuaj yeem tsim los ntawm extrusion, stamping, thiab lwm yam. Txawm hais tias tsis muaj cov hlau lead-dawb tooj dag muaj zog dua thiab hardness, nws cov nqi tsim khoom feem ntau yog siab dua cov hlau lead.
5. Daim ntawv thov teb
Cov tooj dag tsis muaj txhuas yog siv dav hauv cov haujlwm uas muaj qee yam kev tiv thaiv ib puag ncig, xws li cov kav dej haus, dej kub, khoom siv cua txias, cov khoom ua si menyuam yaus, thiab lwm yam.
Lead tooj dag feem ntau siv rau hauv cov xauv, xov tooj cua, khoom siv hluav taws xob thiab kev tsim tsheb. Nrog rau kev paub txog kev tiv thaiv ib puag ncig, ntau lub tebchaws tau txwv tsis pub siv cov tooj dag txhuas hauv kev tsim cov dej haus, tshuab dej kub, thiab lwm yam.
Raws li qhov tshwm sim, muaj qee qhov sib txawv ntawm cov hlau tsis muaj hlau lead thiab cov hlau lead 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 nyob rau hauv cov nqe lus ntawm kev tiv thaiv ib puag ncig, thaum txhuas txhuas muaj kev ua tau zoo dua. Thaum xaiv cov khoom siv tooj dag, koj yuav tsum xaiv raws li kev siv ib puag ncig thiab xav tau cov yam ntxwv ua haujlwm.
