1.Yog yog cov av noo ambient cuam tshuam rau corrosion tsis kam ntawm Q355b?
Mechanism ntawm kev ua: noo noo nyob rau hauv cov cua ua ib "dej zaj duab xis" nyob rau saum npoo ntawm Q355b. Cov yeeb yaj kiab no tsis yog ua rau cov cab kuj mus rau oxygen clearution tab sis kuj yog cov khoom siv hluav taws xob "nrog cov av thiab ntsev), ua kom nrawm nrawm electrochemical corrosion. (Cov tuab thiab ntev dua cov dej zaj duab xis, cov nrawm dua rau corrosion.)
Kev cuam tshuam sib txawv:
Hauv cov chaw qhuav nrog cov av noo<60% (such as indoors in arid inland areas): A stable water film is difficult to form on the surface of Q355B, resulting in an extremely slow corrosion rate (rust depth <0.01mm per year).
Nyob rau hauv high - Cov av noo ib puag ncig ntawm 80% (xws li pas dej hiav txwv, ua rau cov neeg ua luam dej sab qab teb Ungalvanized Q355B tuaj yeem tsim kho cov xeb uas pom tau li ntawm 3-6 lub hlis.
2.Qhov qhov sib txawv thiab qhov sib txawv cuam tshuam rau cov corrosion tsis kam ntawm Q355b?
Mechanism ntawm kev ua: nce siab kub ntsuas hluav taws xob cov tshuaj tiv thaiv cov tshuaj. Rau ib qho, controchemical corrosion tus nqi ntawm cov hlau nce los ntawm kev kwv yees rau txhua 10℃nce hauv qhov kub. Tsis tas li ntawd, thaum qhov kub hloov pauv nruab hnub thiab hmo ntuj, dej zaj duab xis nyob rau saum npoo Q355b undergoes rov ua kom hws thiab evaporation. Qhov no, ua ke nrog qhov sib txawv ntawm cov coeffan uas muaj kev ntxhov siab thiab pleev xim rau sab hauv kev tawg thiab ua kom paub cov qauv corrosive.
Cov xwm txheej raug:
High - kub thiab high- Lub caij ntuj sov ntawm Ungalvanized Q355B cov neeg muaj 20-30 zaug ntawm qhov kub thiab txias, ib puag ncig qhuav.
Hloov chaw txias thiab dej sov (piv txwv li, lub caij nplooj ntoo hlav nyob rau sab qaum teb, txheej thaum nruab hnub thiab {[} Chloride ions (piv txwv li, residual de-icing ntsev) tuaj yeem nkag mus los ntawm cov kab nrib pleb, nrawm corrosion ntawm substrate.
3.Yog ua lub teeb thiab nag lossis daus cuam tshuam rau cov corrosion tsis kam ntawm Q355b?
Lub teeb (tshwj xeeb yog UV): Qhov no feem ntau cuam tshuam rau Q355b cov teeb meem tiv thaiv Q355b cov teeb meem tiv thaiv (xws li anti {1} pa corrosion pleev xim thiab tshuaj tsuag Yas Txau). UV Deating txheej txheej txheej txheej, ua rau nws rau hnub nyoog, hmoov, thiab tev, ua rau nws cov nyhuv tiv thaiv ntawm substrate thiab ua rau Q355b rau kev xeb. (Qhov no muaj tsawg dua kev cuam tshuam rau uncoated tsis muaj nuj nqis lossis galvanized steel.)
Nag lossis nag lossis nag, acid los nag):
Los nag dog dig (pH ≈ 5.6) ntxuav plua plav thiab xeb ntawm cov hlau saum npoo av, tab sis nws tseem muab cov khoom txuas ntxiv ntawm noo noo, nrawm corrosion, nrawm nrawm.
Acid los nag (pH <5.6, muaj cov sulfuric thiab nitric acid) ncaj qha rau cov hlau lossis cov hlau galvanized. Rau cov hlau liab qab, kua qaub los nag nrawm nrawm ntawm cov hlau. Rau galvanized txheej, acid los nag ceev cov txheej zinc txheej (zinc reacts (zinc reacts (zinc reacts (zinc reacts (zinc reacts (zinc reacts (zinc reacts
4.How cov kua qaub cuam tshuam rau corrosion tsis kam ntawm Q355b?
Qhov chaw: Sulphur dioxide (so₂) tau tawm los ntawm thermal fais fab nroj tsuag, hlau mills, thiab nroj tsuag tshuaj lom neeg; nitrogen dioxide (NOT₂) tawm los ntawm kev tso pa tawm.
Mechanism ntawm Kev Ua: Cov roj av no sib xyaw ua ke nrog cov dej hauv huab cua los ua cov tshuaj "acidic aqueous" (xws li sulfucous acid thiab nitric acid). Qhov no ncaj qha corrodes liab qab q355B hlau (FE + H⁺ → Fe²⁺ + H₂↑). Tsis tas li ntawd, nws nrawm qhov kev zam ntawm cov txheej zinc txheej (zn + h →₂₃ → zso₃ + h₂↑). Lub resulting corrosion khoom (xws li zinc sulfate) yog soluble nyob rau hauv dej thiab tsis muaj peev xwm ua daim duab tiv thaiv muaj xeb, ua rau kom txuas ntxiv corrosion. (Piv txwv li, Q355B cov qauv steel nyob rau hauv cov chaw muaj anti- kev kho corrosion tau tsim muaj xeb ntau yam tsis pub dhau lub hlis.)
5.Yog ua rau cov neeg kho tshuab hnav thiab cuam tshuam rau kev tiv thaiv txheej ntawm Q355B?
Hnav: Cov txheej tiv thaiv saum npoo ntawm Q355B hlau yog qhov raug hnav thaum muaj kev thauj mus los (piv txwv li, kev sib txhuam thaum lub sij hawm ntsia hlau), thiab siv (piv txwv li, txheeb ze txav ntawm cov neeg kho tshuab). Piv txwv li, yog tias lub galvanized Q35b tus neeg tiv thaiv yog raug rau ntev- ib txheej sib txhuam los ntawm cov neeg taug kev thiab cov khoom siv zom zaws thiab ua rau muaj kev mob corrosion.
Feem ntau cov kev sib tsoo me nrog cov tsheb lossis cov khoom hnyav uas tau tsoo cov qauv hlau tuaj yeem khawb, tev tawm hauv zinc txheej (tshwj xeeb tshaj yog cov txheej). Corrosive Media (dej, chloride ions) tuaj yeem nkag mus los ntawm thaj chaw uas tsis zoo, ua ntej muaj xeb ua ntej ntawm thaj chaw puas thiab mam li kis mus rau thaj chaw uas nyob ib puag ncig).