SS490 muaj qhov tsis zoo hauv qhov kev tiv thaiv corrosion thiab xav tau kev kho saum npoo rau feem ntau daim ntawv thov. Nws yog carbon-manganese structural steel uas tsis muaj alloying ntsiab (xws li Chromium los yog Nickel) los muab kev tiv thaiv corrosion.
1. Corrosion Resistance ntawm SS490
Hom Hlau:Nws yog ib qho yooj yim carbon steel, tsis yog stainless los yog weathering hlau.
Mechanism:Nyob rau hauv lub xub ntiag ntawm noo noo thiab oxygen, nws yuav tsim hlau oxide (xeb) sai heev. Cov txheej xeb yog ntxeem tau, tsis yog -adherent, thiab tsis tiv thaiv cov hlau hauv qab, tso cai rau kev txhim kho corrosion.
Corrosion Rate:Tus nqi nyob ntawm ib puag ncig:
Qhuav sab hauv:Tsawg heev corrosion.
Humid Sab Hauv Tsev / General Atmosphere:Nruab nrab, uniform corrosion.
Ntug hiav txwv / Marine:High corrosion vim chloride ions.
Industrial:High corrosion vim acidic pollutants (SO₂, NOₓ).
Ntsiab Lus:SS490 tsis muaj lub ntsiab lus "corrosion resistance" nyob rau hauv qhov chaw raug. Nws yog suav tias yog raug rau corrosion.
2. Kev Kho Hniav - Yuav tsum muaj tiag
Txhawm rau tiv thaiv kev xeb thiab ua kom cov qauv ruaj khov thiab kev nyab xeeb, SS490 yuav tsum tau tiv thaiv nrog kev kho saum npoo. Qhov kev xaiv nyob ntawm ib puag ncig thiab xav tau kev pab lub neej.
Common Surface Treatment Systems rau SS490:
| Txoj kev | Txheej txheem / piav qhia | Hom Siv Case | Pros & Cons |
|---|---|---|---|
| Xim Txheej | Primer + Intermediate + Topcoat txheej. | Feem ntau siv rau cov tsev, txuas hniav, cov qauv kev lag luam. | Pros:Ntau yam, xaiv xim dav, kho tau. Cons:Yuav tsum muaj kev saib xyuas, kev npaj nto yog qhov tseem ceeb. |
| Kub-Dip Galvanizing | Dipping steel hauv molten zinc (≈450 degree). | Sab nraum cov qauv, kis tau tus yees, guardrails, ductwork. | Pros:Zoo heev, ntev - tiv thaiv lub sij hawm (20-50+ xyoo), sacrificial anode nyhuv. Cons:Tus nqi pib siab dua, qhov loj me txwv los ntawm da dej, tuaj yeem cuam tshuam cov ntu tuab heev. |
| Metallization (Zinc / Txhuas Txau) | Txau molten zinc los yog txhuas rau grit-blasted nto. | Cov vaj tsev loj, kho, siab - qhov kub thiab txias. | Pros:Kev tiv thaiv zoo, tsis muaj qhov txwv loj. Cons:Yuav tsum tau siv cov txuj ci, txheej ntxeem tau feem ntau xav tau xim sealer. |
| Primer nkaus xwb (Khoom lub tsho tiv no) | Ib txheej ntawm anti-corrosive primer (piv txwv li, zinc-nplua nuj epoxy). | Rau kev tiv thaiv ib ntus ua ntej txheej txheej kawg ntawm -site, lossis rau cov tswvcuab zais / sab hauv. | Pros:Tus nqi qis, yooj yim. Cons:Tsis yog ib qho kev ua tiav rau lub sijhawm ntev - raug. |
3. Cov txheej txheem: Cov kauj ruam tseem ceeb ua ntej kev kho mob
Kev tiv thaiv zoo yog nyob ntawm kev npaj kom zoo, uas feem ntau tseem ceeb tshaj qhov txheej txheem nws tus kheej.
Kev Npaj Ntog (Cov kauj ruam tseem ceeb):
Degreasing:Tshem tawm cov roj thiab cov khoom paug.
Abrasive Blasting (piv txwv li, Sa 2½):Tus qauv kub. Tsim kom huv si, ntxhib thauj tog rau nkoj profile rau txheej adhesion.
Tes / Fais Fab Tshuab Ntxuav (St2, St3):Rau kev ua haujlwm tseem ceeb lossis kev saib xyuas tsawg dua.
Daim ntawv thov:Siv cov txheej txheem xaiv los ntawm kev tswj cov av noo thiab qhov kub thiab txias.
Kev tshuaj xyuas:Xyuas txheej thickness (xws li, nrog ib tug qhuav zaj duab xis thickness gauge) thiab adhesion.
4. Alternative: Siv Weathering Steel (Ib Corrosion-Resistant Option)
Yog hais tias lub sij hawm painting yog undesirable, xav txog huab cua steel raws li ib tug lwm yam khoom siv txij thaum pib.
Nws yog dab tsi:A steel alloyed nrog Cu, P, Cr, Ni (piv txwv li, JIS G 3114 SMA490AW).
Nws ua haujlwm li cas:Ua ib tug ntom, adherent xeb patina uas inhibits ntxiv corrosion. Nws yog "tus kheej- tiv thaiv" tom qab pib huab cua.
Lus Cim Tseem Ceeb:Nws tsis yog tu-dawb nyob rau hauv txhua qhov chaw (tsis pom zoo rau cov tshuaj chloride- nplua nuj los yog tsis tu ncua ntub / qhuav cyclic tej yam kev mob) thiab cov dej ntws pib tuaj yeem stains.
Summary & Teb
Corrosion Resistance:SS490 muaj qhov tsis zoo corrosion kuj. Nws yuav xeb sai yog tias tsis muaj kev tiv thaiv nyob rau hauv ib puag ncig uas muaj dej noo.
Yuav tsum tau kho deg?Yog, nws yog qhov yuav tsum tau ua rau txhua daim ntawv thov raug pom. Txoj kev kho mob yuav tsum raug xaiv raws li kev ua phem ntawm ib puag ncig thiab kev tsim lub neej ntawm cov qauv.
Txuj kev xyaum:Rau cov qauv hlau ruaj khov, ntau- txheej xim txheej txheej dhau ntawm qhov tawg- ntxuav qhov chaw los yog kub- dip galvanizing yog kev lag luam - qauv txheej txheem los tiv thaiv SS490.
Kev tsis saib xyuas kev tiv thaiv saum npoo ntawm SS490 yuav ua rau cov seem poob qis, txo cov load-cov kabmob muaj peev xwm, thiab thaum kawg, kev ua haujlwm tsis ua haujlwm. Ib txwm qhia ob qho tib si cov khoom (SS490) thiab nws cov kev tiv thaiv corrosion (xws li, "SS490, nto npaj rau Sa 2½ thiab pleev xim rau 75μm zinc-nplua nuj epoxy primer + 125μm polyurethane topcoat").