Corrosion tiv thaiv

Hlau khoom thaum lub sij hawm maj mam them nrog ib tug xeb patina. Siv cov kev faib puas lawm yuav luag muab rau hauv cov hmoov av. Kom tsis txhob zoo li no tsis muaj hmoo tau, koj yuav tsum paub dab tsi lub xeb hlau thiab yuav ua li cas los tiv thaiv tawm tsam nws. Hlau yog raug degradation vim raug lwm ib puag ncig, uas yog electrochemically los yog sib. Tshuaj xeb tshwm nyob rau hauv lub xov xwm tsis muaj peev xwm sawv ntawm txoj kev hluav taws xob tam sim no (roj, roj, alcohols). Nws twb raug kiag li tag nrho cov hlau. Electrochemical xeb tshwm sim vim tshwm sim ntawm electrolytic hlau zaj duab xis vim tej influences. Nyob rau hauv kev, tej yam-kev tsev neeg ntsev siv nyob rau hauv txoj kev nyob rau hauv lub caij ntuj no, thiab stray currents. Txoj kev thiab cov hau kev los ntawm cov uas yog tsim los ntawm xeb, muaj ntau ntau yam.

Cov feem nrov thiab ntau yog siv cov coatings. Lawv tuaj nyob rau hauv hlau thiab tsis-metallic mineral. Greater miv nyuas siv zug muab coatings raws li tsim dag hluavtaws polymers. Inorganic tsis-metallic txheej yog ib tug ntau ntau yam. Cov no muaj xws li xim tsev (roj, alkyd thiab txha hniav laus) thiab varnishes (ntoo ib, hluavtaws bitumen). Thaum ua ntawv thov xws li ib tug xeb tiv thaiv tsim ib tug nyias zaj duab xis yog muab tus hlau los ntawm dej thiab tej nyhuv. Xim tsev thiab varnishes yog heev yooj yim mus ua ntawv thov, pheej yig. Thaum pib ntawm kev ua hauj lwm nws yog tsim nyog los nruj me ntsis raws li cov technology ntawm lawv daim ntawv thov. Cover ntawm lub hlau nto yog tsim nyog nyob rau hauv ob peb txheej kom zoo dua tiv thaiv lug ntawm atmospheric cawv.

Nws yog xim hlau coatings inhibitors paub qhov txawv ob hom. Tus thawj sacrificial txheej muaj xws li cadmium, zinc, txhuas. Qhov thib ob - corrosion-resistant txheej ntawm tooj liab, silver, hmoov txhuas, npib tsib xee thiab chromium.

Nyob ntawm seb yuav ua li cas lub mechanism kev txiav txim tau xeb tiv thaiv, nws yog hu ua tus cathode los yog anode. Muaj hlau coatings, contact lenses nrog ntau dua electronegativity, thiab coatings muaj ib tug siab electropositive. Anode coatings yuav mus rau tus thawj hom, tus cathode - mus rau lub thib ob. Kev siv txhuas thiab zinc, raws li cathode li anode coatings - npib tsib xee, tooj liab, tooj dawb.

Ntau txoj kev tiv thaiv hlau tiv thaiv corrosion thiab koom nrog ob peb txheej embodiments. Piv txwv li, rau daim ntawv thov tshuaj inhibitors yog siv ib txoj kev rau txheej nws yog xim hlau lug lwm co: aluminium, zinc.

Yog hais tias cov hlau qauv tau corroded, ces pab qeeb txoj kev puas tsuaj ntawm passivating additives thiab inhibitors. Pab rau inhibition ntawm xeb dab nyob rau hauv alkaline thiab nruab nrab kev kawm xws muaj zog oxidants li alkaline lub ntiaj teb thiab alkali hlau. Yuav kom tiv thaiv lub cuab lub zog nyob rau hauv kev reinforced, siv calcium nitrate-nitrite.

Thaum koj xav tau kev tiv thaiv los ntawm xeb, tshwm sim nyob rau hauv tus ntawm cov sab nraud ib puag ncig thiab atmospheric nag lossis daus, siv volatile inhibitors, uas yog cov ntaub ntawv uas adsorb mus rau lub hlau nto los ntawm huab cua los yog condensed thereon tsim tau ib cov nyias txheej.