1.Vim li cas ho tsis pom zoo?
Ua kom puas lub hauv paus ntawm kev tiv thaiv corrosion: Sandblasting ncaj qha hnav tam sim ntawd thiab tshem tawm cov zinc txheej tseem ceeb no, depleting nws qhov qub ntev - tiv thaiv corrosion.
Tsis tsim nyog tus nqi: Galvanizing nws tus kheej yog tus nqi. Sandblasting nws tam sim no tsis tsuas yog nkim tus nqi ntawm cov galvanizing, tab sis kuj poob nws cov kev tiv thaiv corrosion tshwj tsis yog tias muaj zog tiv thaiv kev ntsuas tau ua raws li (saib hauv qab).
Cov kev nyuaj ntawm kev kho deg: Sandblasted nto sawv cev rau lub tshiab, activated steel substrate, uas yog heev raug rau rusting sai nyob rau hauv lub xub ntiag ntawm huab cua thiab yuav tsum tau tam sim ntawd tom qab kev kho mob (xws li painting).
2.Thaum twg koj xav txog sandblasting galvanized coils?
Npaj rau tha xim tom ntej (feem ntau scenario):
Scenario: Thaum ua ntawv thov siab - cov xim pleev xim los yog hmoov txheej rau cov khoom siv galvanized, ib qho chaw uas muaj qee qhov kev ntxhib los mos yog qhov yuav tsum tau ua kom pom cov txheej txheem adhesion. Cov galvanized du nto muaj adhesion tsis zoo.
Lub hom phiaj: Abrasive blasting tsis yog los "ntxhiab" tab sis theej rau "roughen" steel nto, tsim kom muaj qhov huv si nrog rau cov pob zeb tshwj xeeb (roughness).
Tshem tawm cov galvanizing loj heev los yog cov kab mob:
Scenario: Qhov chaw galvanized muaj cov kab mob tawv ncauj uas nyuaj rau tshem tawm los ntawm lwm txoj kev, hnyav zinc slag, lossis qhov chaw tsis sib xws.
Lub hom phiaj: Abrasive blasting yog siv los ua kom tiav ib qho zoo, huv si substrate nto.
Kho qub galvanized qhov chaw:
Scenario: Cov qub galvanized ib feem tau localized zinc puas thiab xeb.
Lub Hom Phiaj: Ua kom tiav tag nrho cov xeb thiab cov coatings qub hauv kev npaj rau repainting lossis regalvanizing.
3.Yog tias tsim nyog sandblasting, yuav tsum muaj txheej txheem tshwj xeeb dab tsi?
Xaiv qhov zoo abrasive (cov kauj ruam tseem ceeb tshaj plaws):
Tsis txhob zam kiag li: Hlau abrasives (xws li steel grit thiab steel txhaj) thiab siab - cov zaub mov hardness (xws li xim av corundum). Cov no tuaj yeem tshem tawm cov zinc txheej tam sim ntawd thiab ua rau cov hlau substrate puas.
Pom zoo: Flexible, low-hardness non-metallic abrasives.
Nroj tsuag- cov ntaub ntawv raws li: Walnut plhaub, pob kws cobs, thiab lwm yam. Cov ntaub ntawv no muaj lub zog nruab nrab thiab tuaj yeem tshem tawm cov kab mob tsis zoo yam tsis ua rau cov zinc txheej ntom ntom.
Yas-cov ntaub ntawv raws li: Cov hlaws yas thiab cov xuab zeb yas. Cov no yog qhov zoo tagnrho rau kev ua cov hlau mos (xws li txhuas thiab zinc), muab kev tu kom zoo thaum txo cov substrate puas.
Cov zaub mov mos: Dolomite, calcium carbonate, thiab lwm yam.
Kev tswj cov txheej txheem nruj me ntsis:
Cua siab: Siv cua siab tsawg.
Lub kaum sab xis thiab qhov deb: Tsis txhob txau ntawm lub kaum sab xis 90-degree; siv lub kaum sab xis ntau dua thiab ntev dua.
Kev txawj ua haujlwm: Cov neeg ua haujlwm tau paub dhau los yuav tsum tau txiav txim siab txog qib kev kho mob uas yuav tsum tau ua kom tiav qhov huv si yam tsis tas yuav tshem tawm cov zinc txheej ntau dhau.
Tam sim ntawd ua raws li-kev kho mob:
Sandblasting nthuav tawm cov hlau substrate, yuav tsum tau pleev xim rau tom ntej los yog rov- kev tiv thaiv kev kho mob hauv 4 teev (lossis tsawg dua nyob ntawm cov av noo ib puag ncig). Txwv tsis pub, xeb yuav tshwm sim sai.
4.Dab tsi yog qhov kev xaiv zoo dua?
Lub teeb blasting: Qhov no yog kev kho lub teeb heev uas siv cov mos abrasives uas tau hais los saum toj no, npaj tsuas yog ua kom lub ntsej muag roughness.
Kev kho tshuaj hloov pauv tshuaj (xws li, phosphating, passivation): Qhov kev kho no tsis ua rau cov zinc txheej tab sis hloov ua cov yeeb yaj kiab hloov dua siab tshiab uas txhim kho cov xim adhesion.
Mechanical sib tsoo / txhuam hniav: Qhov kev npaj saum npoo no, siv cov ntawv xuab zeb, txhuam hlau, lossis cov cuab yeej tshwj xeeb " txhuam hniav", yooj yim rau kev tswj dua li blasting.
Siv "galvanized primer": Ntau cov txheej txheem tam sim no tau tsim tshwj xeeb rau kev thov ncaj qha rau qhov chaw du galvanized. Lawv muab cov adhesion zoo heev thiab tuaj yeem tshem tawm qhov xav tau rau kev npaj ua haujlwm nyuaj.
5.Dab tsi yog qhov txaus ntshai ntawm sandblasting?
Nws rhuav tshem cov zinc tiv thaiv- txheej txheej corrosion, ua rau cov khoom siv hauv paus xeb yooj yim thiab cov nqi pov tseg.