1. Lub cev thaiv kev: thaiv cov tshuaj corrosive
Tsawg porosity: Tsis zoo li xoob, xeb xeb ntawm cov pa roj carbon hlau, lub patina lub nruj nreem ntim cov qauv siv lead ua kom tsawg heev. Qhov no tiv thaiv cov dej noo ua kua (nag, lwg) thiab gaseous oxygen los ntawm kev ua kom ob qho tib si noo noo thiab oxygen los pib lub tshuab hluav taws xob (fe →+ 2 e⁻).
Polledant Kuj: Alloy Cov Ntsiab Lus xws li CR thiab CU hauv Patina muaj kev cuam tshuam los ua cov tebchaw ruaj khov (piv txwv li, cu₂o) uas ntxiv txo cov txheej txheej permeability. Cov tebchaw no xa tawm cov phom sij ions (piv txwv li, yog li cov ntug dej hiav txwv ntsev, yog li kev ua kom huv si los ntawm kev rhuav tshem cov oxides.
2. Tshuaj Kev Cai: inhibiting Electrochemical Corrosion
Kev Hloov Hluav Taws Xob Hluav Taws Xob: Peb Patina ua raws li cov hluav taws xob insulator. Nws ua rau cov hluav taws xob hluav taws xob ntawm lub tshuab hluav taws xob ntawm anodic (oxidizing) steel saum npoo av thiab cathodic) oxygen rau saum huab cua, ua rau muaj cov pa hluav taws xob uas tsav corrosion.
Stabilizing hlau ions: Patina cuab ntxiab feed (tsim los ntawm cov hlau oxidation) nyob rau hauv nws cov qauv, tiv thaiv cov lus no los ntawm kev ua kom noo thiab tsiv teb tsaws chaw. Instead, Fe²⁺ is oxidized to more stable Fe³⁺, which integrates into the patina's crystal lattice-strengthening the layer rather than causing further rusting.
3. Tus kheej -}} kho: kho kev puas tsuaj me
Thaum lub patina loj hlob me me tawg los yog khawb (piv txwv li, los ntawm kev cuam tshuam me), cov qauv tshiab tawm tsam sai nrog huab cua thiab ya raws.
Tus muaj xeb tshiab tsim ntawm lub vev xaib puas yog nplua nuj nyob hauv cov hlau cov ntsiab (CU, CR, P). Lub sijhawm dhau los, qhov kevcai tshiab no nrog cov nrib pleb, sau cov kab nrib pleb thiab rov ua kom muaj kev tiv thaiv.
Qhov no tus kheej -} hehoinging relies (40-60% rh): tsis txaus kom ntxuav tawm cov oxides tshiab ua ntej lawv muab tso ua ntej.
