Dezincification yog dab tsi?
Dezincification yog ib hom kev txhim kho corrosion. Nws cuam tshuam rau tooj dag, uas yog ib qho alloy ntawm tooj liab thiab zinc. Cov txheej txheem xaiv tshem cov zinc ntawm cov hlau. Qhov no tawm tom qab tsis muaj zog, ntxeem tau, spongy loj ntawm tooj liab. Cov khoom poob nws lub zog thiab tuaj yeem ua tsis tiav.
Electrochemical Mechanism piav qhia
Los ntawm kev pom kev tshawb fawb, nws yog qhov cuam tshuam corrosion mechanism. Nws yog ib daim ntawv ntawm galvanic corrosion ntawm zinc thiab tooj liab hauv tooj dag. Cov zinc, ua ntau dua reactive, yog nyiam yaj. Dab tsi tseem tshuav yog nkig, tooj liab - nplua nuj qauv feem ntau nrog lub ntsej muag pinkish .
Qhov Siab -Zinc Risk Threshold
Cov ntsiab lus zinc yog qhov tseem ceeb. Tus qauv tooj dag haum feem ntau muaj cov ntsiab lus zinc ntawm kwv yees li 30-40%. Kev tshawb fawb pom tau tias qhov kev pheej hmoo ntawm dezincification pib ntawm 15% zinc. Nws yuav hnyav heev thaum cov ntsiab lus zinc nce mus txog 35% lossis siab dua. Standard "daj tooj dag" poob rau hauv pawg no muaj kev pheej hmoo siab.
Plug Type vs. Layer Type
Muaj ob yam tseem ceeb ntawm no corrosion. "Plug hom" tsim qhov sib sib zog nqus, thaj chaw "spongy" thaj chaw. Nws nkag mus sai sai thiab tshwm sim hauv cov dej nruab nrab lossis alkaline nrog cov ntsiab lus ntsev thiab kub siab. "Txheej hom" kis ib txheej nyias, ntxeem tau thoob plaws saum npoo. Qhov no tshwm sim hauv cov dej me ntsis acidic nrog cov tshuaj chloride siab.
Qhov "Copper Sponge" Failure
Qhov tshwm sim ntawm cov txheej txheem no yog kev puas tsuaj. Kev hloov pauv ntawm cov khoom siv hlau mus rau "cov khoom tsis muaj zog thiab spongy tooj liab". Nws tsis tuaj yeem tiv taus dej siab ntxiv lawm. Daim ntawv tshaj tawm forensic tau piav qhia tias nws yog zinc "ua tiav leached ... tawm hauv qhov ntxeem tau los ntawm tag nrho cov phab ntsa tuab". Qhov no yog ib qho ua rau muaj qhov tshwm sim tam sim ntawd.
Tshuaj Accelerators: Chlorine thiab Chloramines
Cov tshuaj nyob rau hauv cov dej hauv nroog ceev cov tshuaj tiv thaiv. Cov tshuaj chlorine yog ib qho kev paub txog cov tshuaj chlorine thiab chloramines. Nws ua qhov nrawm nrawm ntawm qhov uas zinc leaches tawm ntawm cov hlau. Cov cheeb tsam uas muaj dej kho hnyav heev yog corrosion- thaj chaw muaj kev pheej hmoo rau tus qauv tooj dag.
Qhov kub thiab txias Factor
Thaum tshav kub kub yog ib qho tseem ceeb catalyst. Cov txheej txheem dezincification tau yooj yim heev los ntawm kev kub siab dua. Qhov kub ntawm cov dej ntau dua, zinc leaches sai dua. Qhov no yog vim li cas standardtooj dag fittingsnyob rau hauv cov dej kub kab tsis nrawm dua li cov kab dej txias.
Environmental Risk Factors
Cov xwm txheej tshwj xeeb ua rau muaj kev tawm tsam. Cov no muaj xws li nyob twj ywm lossis qis - dej ntws, tsis zoo aeration, thiab me ntsis acidic lossis alkaline pH qib. Permeable deposits los yog scale ntawm haum nto ntxiab corrosive tiv thaiv cov hlau. Qhov no accelerates qhov kev puas tsuaj loj.
Detection: Paj yeeb Hawj thiab Cracks
Kev tshawb pom ntxov yog qhov nyuaj tab sis ua tau. Visually, nrhiav ib tug reddish los yog liab discoloration ntawm qhov chaw. Qhov no qhia tau tias tooj liab raug tom qab zinc tau leached lawm. Kev poob ntawm cov luster lossis cov kab nrib pleb saum npoo kuj yog cov cim ceeb toom. Txawm li cas los xij, kev puas tsuaj sab hauv tuaj yeem loj heev yam tsis pom kev hloov pauv sab nraud.
Kev Tiv Thaiv Tus Qauv: DZR Brass
Txoj kev daws teeb meem no yog DZR tooj dag. DZR sawv cev rau Dezincification Resistant. Cov hlau no muaj me me ntawm arsenic (0.1%), tin, lossis phosphorus. Cov additives stabilize lub microstructure thiab nquag tiv thaiv zinc los ntawm leaching tawm.
CW602N / CZ132 Specifications
Qhov feem ntau DZR specification yog CW602N (tseem hu ua CZ132). Nws cov nominal muaj pes tsawg leeg yog kwv yees li 62% Copper, 36% Zinc, 2% Lead, thiab 0.1% Arsenic. Qhov sib ntxiv ntawm qhov me me 0.1% ntawm arsenic yog dab tsi tiv thaiv lwm 36% ntawm zinc los ntawm kev yaj los ntawm dej kub.
Cov kev coj ua zoo tshaj plaws rau cov kav dej
Rau txhua qhov dej kub lossis dej nruj, kev xaiv phau ntawv yog qhov tseem ceeb. Koj yuav tsum qhia meej DZR tooj dag fittings rau cov kav dej kub. Tsis txhob cia siab rau tus qauv "daj tooj dag" rau cov cheeb tsam no. Saib rau "DZR" lossis "CW602N" cov cim ntawm cov khoom. Ntau lub tsev lis dej num tam sim no xav tau DZR tooj dag rau kev siv dej haus.
Xaus ntawm Dezincification
Dezincification yog kev puas tsuaj ntawm tooj dag los ntawm sab hauv. Nws tawm ib qho tsis yooj yim "dawb daim txhuam cev" uas muaj ib zaug muaj zog hlau. Nws yog tsav los ntawm cov ntsiab lus zinc siab, dej kub, thiab cov tshuaj phem xws li chlorine. Nws tuaj yeem tiv thaiv tau los ntawm kev siv DZR (CW602N)tooj dag fittings. Qhov kev hloov kho me me no ua kom ntseeg tau tias koj cov kav dej yuav kav ntev li kaum xyoo es tsis ua tiav ntxov.
