1.Qhov laj thawj tseem ceeb yog vim li cas nws tsis siv tau?
Qhov chaw nyob hauv av ntawm cov mines yog qhov tshwj xeeb heev, muaj cov pa roj methane thiab cov hmoov av hmoov av, ob qho tib si yog cov nplaim taws thiab tawg. Yog li ntawd, txhua yam khoom siv uas muaj peev xwm tsim tau qhov hluav taws xob hluav taws xob raug txwv nruj heev.
Cov khoom siv tshuaj lom neeg ntawm zinc: Zinc yog cov hlau uas muaj zog uas tsis tshua muaj hardness thiab melting point. Thaum cov txheej txheej galvanized los rau hauv kev sib cuag nrog cov pob zeb tawv lossis lwm yam hlau los ntawm kev sib txhuam los yog kev cuam tshuam, nws tuaj yeem tsim cov pob zeb me me (hu ua kev sib txhuam).
Ignition Risk: Cov kev sim tau pom tias kev sib txhuam qhov hluav taws xob uas tsim los ntawm zinc alloys muaj lub zog txaus los cuam tshuam qee qhov concentration ntawm methane roj. Qhov no ua rau muaj kev pheej hmoo tuag taus rau cov mines.
2.Dab tsi yog cov kev ua haujlwm thiab ib puag ncig yuav tsum tau ua rau kev txhawb nqa hydraulic?
Cov kev xav tau kev siv tshuab nruj: Hydraulic txhawb nqa yuav tsum tiv taus kev tsim siab loj; Yog li ntawd, lawv cov khoom siv (sab saum toj beams, bases, shield beams, thiab lwm yam) feem ntau yog siv high -lub zog steel daim hlau, xws li Q460C, Q550D, Q690D, los yog ntau zog steels. Cov hlau no muaj lub zog siab, toughness, thiab weldability. Ordinary galvanized coils (xws li DX51D + Z) feem ntau siv coj mus muag -qib lossis stamping- qib substrates, uas nws lub zog tsis txaus rau cov kev xav tau ntawm kev txhawb nqa cov khoom siv.
Kev hnav hnyav thiab cuam tshuam: Lub ntsej muag ua haujlwm hauv av yog qhov hnyav, thiab cov kev txhawb nqa tas li rub thiab sib tsoo nrog cov hlua khi thiab gangue. Cov txheej galvanized yog nyias heev (feem ntau kaum ntawm micrometers), thiab nyob rau hauv xws li hnyav hnyav, nws tau hnav sai sai, poob nws txoj haujlwm tiv thaiv - corrosion, tom qab ntawd cov hlau substrate corrodes sai heev.
Welding Issues: Ib qho tseem ceeb ntawm kev ua haujlwm vuam yog koom nrog hauv kev tsim cov khoom siv hydraulic. Cov txheej galvanized evaporates ntawm qhov kub thiab txias ntawm vuam, ua rau cov zinc vapor (zinc oxide, uas yuav ua rau "hlau fume fever"), thiab tib lub sijhawm, nws yuav ua rau qhov zoo ntawm cov vuam, ua qhov tsis xws li porosity thiab tawg, cuam tshuam rau cov qauv kev ntseeg siab ntawm kev txhawb nqa.
3.Yuav ua li cas ua ntej pretreatment ua ke nrog siab -txheej txheej txheej rau kev tiv thaiv corrosion?
Sandblasting/shot blasting: Ua ntej, lub siab - lub zog steel phaj cov khoom ua haujlwm tau ua kom huv si huv si kom tshem tawm cov nplais oxide thiab xeb, ua tiav cov qauv kev huv thiab roughness (piv txwv li, qib Sa2.5).
Daim ntawv thov primer thiab topcoat: Tom qab ntawd, ib qho epoxy zinc- nplua nuj primer los yog inorganic zinc- nplua nuj primer yog txau, ua raws li los ntawm hnav- tiv taus thiab corrosion- tiv taus tuab- zaj duab xis topcoat (xws li, epoxy coal tar xim, hloov xim epoxy, lwm yam). Tag nrho cov txheej txheem txheej txheej yog tuab dua li zinc plating txheej, muab lub neej ntev tiv thaiv corrosion thiab tshem tawm cov kev pheej hmoo ntawm kev sib txhuam.
Qhov no tam sim no yog qhov tseem ceeb tshaj plaws thiab txhim khu kev qha los tiv thaiv- txheej txheem corrosion.
4.Dab tsi yog qhov tseeb kev tiv thaiv corrosion rau hydraulic kev txhawb nqa nyob rau hauv underground thee mines?
Dacromet/Zinc-Chromium Txheej
Qhov no yog electrolytically -cov txheej txheem dawb txheej nrog kev tiv thaiv xeb zoo heev thiab tsis muaj qhov tshwm sim los ntawm kev sib txhuam.
Nws yog feem ntau siv rau bolts thiab me me ntawm cov brackets. Txawm li cas los xij, rau cov khoom siv loj loj, tus nqi thiab cov txheej txheem nyuaj yog siab dua, ua rau nws tsis tshua siv ntau dua li cov tshuaj tsuag txheej.
Huab cua hlau
Hauv qee qhov kev mob corrosive tsawg, cov hlau uas muaj qee yam ntawm atmospheric corrosion kuj tuaj yeem raug xaiv ncaj qha, tab sis tus nqi siab dua.
5.Dab tsi yog vim li cas vim li cas galvanized coils tsis haum rau kev tsim cov khoom siv tseem ceeb ntawm kev txhawb nqa hydraulic hauv cov mines hauv av?
Lub hauv paus yog vim li cas: Cov txheej galvanized ua rau muaj kev nyab xeeb ntawm kev sib txhuam- ua rau muaj roj tawg, ua txhaum txoj cai kev nyab xeeb ntawm cov thee mine.
Qhov thib ob yog vim li cas: Lub substrate tsis muaj zog txhua yam txaus thiab muaj qhov tsis zoo weldability, ua tsis tau raws li cov neeg kho tshuab kev ua tau zoo thiab kev tsim cov txheej txheem ntawm kev txhawb nqa hydraulic.