Anti-corrosion epoxy hmoov txheej ua si tiv thaiv kev ua haujlwm

Kev sib koom ua ke ntawm kev tiv thaiv cathodic thiab kev tiv thaiv corrosion txheej, tso cai rau hauv av los yog underwater hlau qauv kom tau txais kev tiv thaiv zoo tshaj plaws thiab zoo. Feem ntau coated nrog cov txheej tiv thaiv ua ntej siv, rau cov hlau thiab dielectric ib puag ncig hluav taws xob rwb thaiv tsev cais, cov txheej txheem zoo tuaj yeem tiv thaiv ntau dua 99% ntawm cov qauv txheej txheej los ntawm corrosion. Cov yeeb nkab txheej hauv kev tsim khoom, tsheb thauj mus los thiab ua kom muaj kev puas tsuaj, sau cov txheej txheem ntom ntom, thiab lwm yam), nws tsis yog qhov ua tau rau pipeline corrosion ib puag ncig yog cais tawm kiag li. Tab sis kuj rau anti-corrosion rwb thaiv tsev txheej ntawm ntau yam ntaub ntawv, nyob rau hauv txawv degrees, absorbent thiab breathable, thiab yuav maj mam faus absorbent. Txhawm rau kom muaj txiaj ntsig zoo los tiv thaiv corrosion, nws yog ib qho tsim nyog yuav tsum tau siv cov kev tiv thaiv cathodic uas yog, kev tiv thaiv kev sib koom ua ke. Cov txheej txheej tuab (thickness> 1mm), cov kav dej sib txuas yuav tsum tau xaiv kev tiv thaiv muaj peev xwm ntawm -1.10 rau-1.15V (CSE), cov txheej nyias nyias (thickness ≤ 1mm) coj qhov kev tiv thaiv muaj peev xwm ntawm -1.05 rau-1.10V (CSE), Noj rau hauv cov av muaj pes tsawg leeg, av noo, kub, hom txheej, txheej zoo, nrog rau cov kab mob, kev kho kom haum rau kev tiv thaiv muaj peev xwm, ob qho tib si los tiv thaiv cov kav dej tsis muaj kev puas tsuaj los tiv thaiv corrosion. Qhov corrosion ntawm polarization tam sim no kev soj ntsuam ib puag ncig zoo dua. "Kev Tiv Thaiv" yog lub ntsiab lus tseem ceeb ntawm no, uas tiv thaiv corrosion epoxy hmoov txheej nyob rau hauv qhov chaw, "kev tiv thaiv"?

Lub coated cathode stripping ntawm txheej, kev puas tsuaj, qhov tseeb faus steel pipeline los khiav qhov kev tiv thaiv zoo tshaj plaws xaiv cathodic tiv thaiv txheej (3PE txheej, hauv qab fusion bonded epoxy hmoov) tawm ntawm cov laj thawj tsim nyog tshawb nrhiav. Hais txog kev tiv thaiv zoo tshaj plaws. Tam sim no-muaj peev xwm nkhaus hauv cov kws tshawb fawb txawv teb chaws kawm txog kev tiv thaiv corrosion thiab cathodic tiv thaiv, khaus hydrogen desorption cov tshuaj tiv thaiv muaj peev xwm ntawm-1.15V. Raws li kev tshawb nrhiav Malaysia, Lloyd's Register, Plhaub muab kev tiv thaiv ntau tshaj plaws ntawm-1.1V txwv coj-1.15V; German tus qauv DIN30676-19853.1 nyeem raws li hauv qab no: nyob rau hauv lub nyias txheej (<1 hli) tuab yog siv rau corrosion tiv thaiv rooj plaub, vim lub polarization yuav muaj kev cuam tshuam qhov opposite xws li hlwv tsim, thiaj li yuav txo qhov kev cuam tshuam, yuav tsum txwv qhov Scope ntawm kev tiv thaiv muaj peev xwm raws li kev ua haujlwm ntawm txheej txheej, xws li kev tiv thaiv siab tshaj plaws ntawm -1.00 ~~-1.20V (tus txheeb ze CSE). Txawv teb chaws, tshwj xeeb tshaj yog hais txog lub peev xwm ua rau tsis ua hauj lwm ntawm txheej txheej los ntawm ntau yam, nrog rau cov av muaj pes tsawg leeg, av noo, kub, hom txheej, txheej txheej zoo thiab microbial, kev lag luam gene.rally txiav txim siab kom tsis txhob muaj peev xwm hluav taws xob poob -1.05 ~ - 1.10V (CSE) (Ceeb toom: kev siv dav dav ntawm fusion bonded epoxy hmoov txheej). Cathodic tiv thaiv txhuas txheej (3PE txheej hauv qab ntawm lub tshuab ntawm fusion bonded epoxy hmoov txheej).

Txheej hom, av noo, qhov kub thiab txias txiav txim siab txheej txheej ntawm dej nqus, tiv thaiv kev nkag mus rau hauv kev ua haujlwm ntawm txheej txheej thickness thiab txheej txheej nyob rau hauv tib yam kev mob. Kev tshawb fawb tau pom tias cross-linked epoxy resin yuav tsim ib qho ntawm cov pore thiab pore raws rau cov dej molecules rau hauv epoxy resin. Kev daws ncav cuag cov txheej txheem / hlau interface, los ntawm qhov nkag mus rau hauv cov khoom siv corrosion ntawm cov yeeb yaj kiab hauv kev sib tshuam nrog cov tshuaj tiv thaiv hlau, txheej txheej ntawm cov khoom siv corrosion los tiv thaiv cov tshuaj tiv thaiv ntawm cov hlau thiab cov tshuaj, cov txheej txheem kuj txo qis. Nrog ntau thiab ntau corrosive ions ncav cuag lub interface, txheej txheej ntawm corrosion khoom zaj duab xis yog puas, corrosion intensified, thiab thaum kawg ua rau lub epoxy txheej stripped los ntawm lub nruas. Fusion bonded epoxy hmoov coatings kho yog tseem nplua nuj nyob rau hauv ether thiab hydroxyl pawg, cov active pab pawg neeg thiab cov yeeb nkab nto ruaj khov ua ke los ntawm cov tshuaj bonds los tsim anti-corrosion txheej. Sau lub qhov ncauj ntawm txheej, ntom, pinhole yog vim li cas, txheej txheej yog qhov sib txawv ntawm cov dej nqus thiab permeability, yog tias kev tiv thaiv cathodic ntau dhau, ua rau cathodic hydrogen evolution, nrog rau cov nquag hydrogen atoms ntawm cov khoom sau, rau ib qho twg. , hydrogen yuav ether thiab hydroxyl cov tshuaj tiv thaiv, yog li undermining lub zog ntawm daim ntawv cog lus ntawm txheej thiab steel yeeb nkab, uas ua rau lub ploj ntawm daim ntawv cog lus lub zog. Qhov tshwm sim yog tias txheej txheej tawm ntawm cov yeeb nkab steel.