Soldering hlau solder los tiv thaiv kev lom lom!
Nyob rau hauv qhov tseeb, lead yog ib yam tshuaj lom. Lead (Pb), ib tug grey-dawb hlau, muaj ib tug atomic luj ntawm 207.20, ib tug tshwj xeeb lub ntiajteb txawj nqus ntawm 11.34, ib tug melting point ntawm 327.5 degree, thiab lub boiling point ntawm 1620 degree. Thaum rhuab mus rau 400 degree -500 degree, ib tug loj npaum li cas ntawm txhuas vapor yuav khiav. Thiab sai sai oxidized rau hauv cov hlau lead oxide nyob rau hauv cov huab cua, thiab condensed mus rau hauv hmoov txhuas. Raws li qhov kub ntawm cov hlau lead molten nce, nws tuaj yeem raug oxidized ntxiv rau hauv cov hlau lead oxide, dilead trioxide, thiab trilead tetroxide, tab sis lawv tag nrho tsis ruaj khov, thiab thaum kawg dissociate rau cov hlau lead oxide thiab oxygen. Kev nqus dej ntau dhau los ntawm tib neeg lub cev tuaj yeem ua rau muaj kab mob lead lom. Kev noj cov tshuaj tsawg tsawg yuav cuam tshuam rau tib neeg kev txawj ntse, lub paj hlwb thiab kev ua me nyuam, uas yog, kev ua haujlwm lead lom lom, uas feem ntau yog mob ntev. l, cov ntshav txhuas ntau tshaj 50 ug / t, keeb kwm kev ua haujlwm thiab cov tsos mob ntawm kev kho mob yog lub hauv paus rau kev kuaj mob.
Kev ua haujlwm lead lom lom muaj cov tsos mob ntawm lub paj hlwb, digestive, ntshav thiab lwm yam kab mob:
1. Cov hlab ntsha
Cov tsos mob tseem ceeb yog neurasthenia, polyneuropathy thiab encephalopathy.
Neurasthenia yog ib qho ntawm cov tsos mob tshwm sim thaum ntxov thiab tshwm sim ntawm kev ua xua, tshwm sim raws li kiv taub hau, mob taub hau, qaug zog, nco tsis tau, pw tsaug zog, npau suav, thiab lwm yam. cov tsos mob ua haujlwm. Tseem muaj ntau tus neeg mob uas muaj cov kab mob lead lom thaum ntxov, thiab cov tsos mob saum toj no tsis pom tseeb.
2. digestive system
Cov mob me me tshwm sim raws li cov tsos mob ntawm plab hnyuv, thaum mob hnyav tshwm sim nrog mob plab. Cov tsos mob ntawm plab hnyuv muaj xws li cov xim hlau nyob rau hauv lub qhov ncauj, tsis qab los noj mov, epigastric mob thiab tsis xis nyob, mob plab thiab cem quav, cov quav qhuav nyob rau hauv cov duab ntawm abacus hlaws dai, thiab intractable cem quav feem ntau yog ib tug precursor ua ntej pib colic. Lub plab colic yog ib qho kev tawm tsam tam sim ntawd, feem ntau nyob ib puag ncig ntawm txoj hlab ntaws, thiab yog qhov mob tsis tu ncua, uas hnyav dua thaum lub sij hawm paroxysms, thiab txhua qhov kev tawm tsam yuav kav ntev li ob peb feeb mus rau ob peb teev. Vim tias qhov mob hnyav heev thiab tsis tuaj yeem tiv taus, nws feem ntau khoov nws lub duav thiab lub hauv caug, toss thiab tig tsis xis nyob, thiab nias nws lub plab nrog nws txhais tes kom txo qhov mob. Nyob rau tib lub sijhawm, nws daim tawv nqaij daj ntseg, tag nrho nws lub cev tawm hws txias, thiab nws yuav ntuav.
3. Ntshav system
Qhov laj thawj tseem ceeb yog cov hlau lead cuam tshuam nrog cov txheej txheem hemoglobin synthesis thiab ua rau muaj kev hloov pauv hauv nws cov metabolites, xws li txo cov ntshav δ-ALAD kev ua, nce zis δ-ALA, nce zis CP, nce ntshav FEP, ZPP, thiab lwm yam, thiab thaum kawg ua rau. rau anemia, feem ntau hypochromic ib txwm ntshav liab hom ntshav liab.
4. Lwm cov tshuab
Kev puas tsuaj rau ob lub raum yog tshwm sim ntau dua nyob rau hauv mob, subacute lead lom lom los yog mob hnyav, amino acid proteinuria, qe ntshav liab, qe ntshav dawb thiab casts thiab lub raum tsis ua haujlwm, qhia txog tshuaj lom nephropathy, nrog rau cov ntshav siab. Cov poj niam cov neeg ua haujlwm muaj kev nkag siab ntau dua rau cov hlau lead, tshwj xeeb tshaj yog thaum cev xeeb tub thiab pub niam mis, uas tuaj yeem ua rau muaj menyuam tsis taus, nchuav menyuam, yug ntxov ntxov, tseem yug menyuam thiab ua rau muaj kab mob lead hauv cov menyuam mos. Cov txiv neej ua haujlwm tuaj yeem ua rau cov phev suav tsawg, txo qis kev ua haujlwm thiab hloov pauv morphological. Tsis tas li ntawd, nws tseem tuaj yeem ua rau hypothyroidism.
Lead-free solder wire yog ib puag ncig tus phooj ywg, tab sis cov hlau lead-dawb solder hlau kuj ua rau tib neeg lub cev. Cov ntsiab lus tsis tshua muaj hlau lead-dawb solder hlau tsis muaj txhuas. Piv nrog cov hlau lead uas muaj cov hlau lead, cov hlau tsis muaj hlau lead yog qhov teeb meem rau ib puag ncig thiab tib neeg lub cev. Kev ua qias tuaj tsawg dua li coj. Cov roj uas tsim thaum lub sij hawm soldering tseem yog tshuaj lom, thiab tseem muaj cov pa roj xws li roj rosin thiab zinc chloride.
Ceev faj
1. Thaum soldering Cheebtsam nrog hluav taws xob soldering hlau, siv ROHS tin hlau los txo cov tshuaj lom los ntawm cov hauv paus hniav.
2. Ua tib zoo saib xyuas qhov cua thaum lub sijhawm ua haujlwm kom txo tau qhov nqus ntawm cov vapor.
3. Txhim khu kev tiv thaiv tus kheej. Cov cuab yeej tiv thaiv tus kheej suav nrog cov cuab yeej tiv thaiv ua pa (qhov ncauj qhov ntswg, daim npog ntsej muag tiv thaiv plua plav thiab tshuaj lom).
4. Koj yuav tsum ntxuav koj txhais tes tom qab siv lub solder, ua haujlwm zoo hauv kev tu tus kheej thiab ua kom muaj kev nyiam huv zoo, thiab tsis txhob haus luam yeeb lossis noj mov hauv chav ua haujlwm.
5. Noj zaub mov zoo. Txhawm rau txhim kho lub cev tiv thaiv kab mob, qee cov khoom noj khoom haus tshwj xeeb yuav tsum tau ua kom zoo ntxiv raws li qhov xwm txheej thiab cov yam ntxwv ntawm cov teeb meem cuam tshuam rau kev ua haujlwm ntawm cov hlau lead. Muaj ntau yam khoom siv hauv cov khoom noj, uas muaj cov nyhuv chelates thiab tiv thaiv cov hlau lead puas.
