Hmoov -} coated tais yog ntau ruaj dua li decrosive ib puag ncig lossis kev xeb ib puag ncig. This is due to the coating (usually epoxy resin, polyester powder, etc.) applied through an electrostatic spraying and high-temperature curing process. Cov txheej txheej no txuas ntxiv mus txuas ntxiv, hnav khaub ncaws, thiab pephole - Dawb zaj duab xis (feem ntau 60-120μm tuab). Lub cev no ua rau cov dej noo, oxygen, thiab corrosive ions los ntawm cov hlau nkag, tiv thaiv cov corrosion. Tsis tas li ntawd, ua tsaug rau nws cov tshuaj ruaj khov zoo heev, nws tiv taus cov kua qaub ua kom zoo, thiab ua kom pom cov xeb uas tsis muaj xeb thiab corrosion teeb meem uas tus txheej txheem stague plague.
Piv rau cov khoom siv hlau loj (tsis muaj cov tais diav yas hauv 1-2 xyoos, lub sijhawm yas txau loj tuaj yeem tiv thaiv 5-10 xyoo ntawm kev siv corrosion. Hauv kev txhim kho ib puag ncig, cov txheej txheem qub txheej tev thiab cov khoom siv puag ncig ua haujlwm tsis muaj kev tshem tawm lossis xeb tshem tawm cov nqi kho mob. Vim li no, yas txau cable feem ntau muaj lub neej pabcuam ntawm 15-20 xyoos, ua rau lawv muaj ntau lub sijhawm muaj cov tais diav nrog 3-5 xyoos, cov vaj tse nyob hauv av, ntug dej hiav txwv, thiab lwm yam xwm txheej.
