1.Dab tsi yog qee yam ua rau substrate defects?
Kev nkag mus rau txawv teb chaws: Thaum lub sij hawm thauj los yog cia, txias- dov steel coils tuaj yeem khaws cov ntaub ntawv hlau, plua plav, roj, thiab lwm yam khoom me me ntawm lawv qhov chaw. Yog tias cov kab mob no tsis raug tshem tawm kom huv si ua ntej galvanizing, lawv yuav cuam tshuam qhov kev sib raug zoo ntawm cov zinc molten thiab steel substrate thaum lub sij hawm txheej txheem galvanizing, ua rau pitting tom qab detachment.
Ua ntej- muaj qhov tsis xws luag hauv substrate:
Xeb: Yog tias cov hlau coil khaws cia rau lub sijhawm ntev lossis nyob rau hauv qhov chaw ntub dej, xeb me ntsis (sov xeb) yuav tshwm sim ntawm qhov chaw. Cov kab xeb no nyuaj rau tshem tawm tag nrho hauv ntu tu, thiab yuav tsim pitting lossis dub me ntsis tom qab galvanizing.
Rolling defects: Cov qhov dej thiab cov hlau oxide indented generated thaum lub sij hawm txias dov yuav ncaj qha los ntawm galvanized nto.
2.Dab tsi yog vim li cas rau pretreatment ua ntej galvanizing?
Lub luag haujlwm ntawm kev tu vaj tse yog los muab qhov chaw huv huv thiab qhib qhov chaw rau galvanizing.
Kev tu alkaline tsis txaus: Tsis txaus degreasing kua concentration lossis kub, lossis tsis txaus txhuam cov menyuam siab, ua rau tsis muaj txiaj ntsig tshem tawm cov roj thiab cov hmoov hlau los ntawm steel strip nto. Cov residues carbonize nyob rau hauv lub qhov cub annealing, tsim tawv stains uas cuam tshuam rau galvanizing.
Tsis zoo electrolytic tu: Scale buildup ntawm daim hlau electrode, tsis zoo tam sim no ceev, thiab lwm yam., ua rau ib tug txo nyob rau hauv electrolytic degreasing zog.
Kev yaug tsis tiav: Alkaline lossis acidic daws (yog tias tau ua tiav) cov khoom seem ntawm cov hlau nplaum tuaj yeem ua rau kub hnyiab lossis oxide tsim thaum nkag mus rau zinc da dej, ua rau pitting.
3.Yuav ua li cas cuam tshuam qhov muaj pes tsawg leeg ntawm zinc tov?
Cov ntsiab lus txhuas ntau dhau: Hauv Galvalume (55% aluminium-zinc) lossis siab- aluminium coatings, txhuas tau nkag siab nrog cov pa oxygen hauv lub cub tawg los tsim cov khoom raug tshem tawm aluminium oxide (Al₂O₃) particles. Cov me me, cov khoom nyuaj no ua raws li cov hlau strip nto, ua kom zoo pitting.
Zinc Dross: Thaum zinc da dej yog saturated nrog hlau, nws reacts nrog zinc los tsim hlau -zinc intermetallic compounds (xws li FeZn₇), piv txwv li, zinc dross. Zinc dross hais raug tshem tawm hauv zinc da dej los yog nyob rau hauv qab, thiab yog nqa tawm los ntawm lub tsiv steel sawb, nias rau hauv lub txheej thiab sib sau pitting.
Hauv qab Dross: Coarse hais nyob rau hauv qab ntawm lub lauj kaub zinc.
Deg Dross: Oxides thiab slag particles floating rau saum npoo ntawm zinc da dej.
Suspended Dross: Cov khoom me me sib npaug sib npaug hauv cov zinc da dej vim qhov sib ntxiv ntawm txhuas lossis kub hloov pauv, ua rau muaj kev pheej hmoo loj tshaj plaws.
4.Dab tsi cuam tshuam cov txheej txheem parameter teeb meem?
Cov kub kub galvanizing ntau dhau: kub dhau heev ua rau cov tshuaj tiv thaiv ntawm hlau thiab zinc, ua rau ntau cov hlau yaj mus rau hauv zinc molten thiab tsim ntau zinc dross. Nws kuj accelerates aluminium oxidation.
Cov teeb meem ntawm cov riam phom: cua tsis zoo lub kaum sab xis lossis qhov deb, los yog lub qhov thaiv ntawm lub taub hau, ua rau lub tshuab tsis sib xws, uas tuaj yeem tshuab oxides los ntawm zinc nto mus rau txheej.
Cov kab ntau lawm tsis ruaj khov: Kev hloov pauv ceev cuam tshuam rau kev ruaj ntseg ntawm cov hlau sawb nyob rau hauv lub lauj kaub zinc thiab qhov ua tau zoo ntawm cov riam cua tshuab ua haujlwm.
5.Dab tsi yuav cuam tshuam cov khoom sib kis?
Rauv yob nodules: Tom qab ua haujlwm ntev nyob rau hauv lub qhov cub annealing, oxide txheej nyob rau saum npoo ntawm lub cub tawg yob sinters nrog hlau hmoov thiab lwm yam impurities ntawm cov hlau sawb, tsim cov nodules nyuaj. Cov nodules ib ntus nias tawm tsam steel strip nto, ua rau indentations los yog puas, uas manifests raws li periodic pitting los yog pob tom qab galvanizing.
Stabilizing yob / submerged yob cov kab mob: Zinc dross accumulates nyob rau saum npoo ntawm stabilizing yob thiab submerged yob hauv lub lauj kaub zinc. Yog hais tias cov dross hais detach, lawv yuav ncaj qha mus rau lub hlaws steel sawb.