Ntawm no, peb yuav tsis tham txog qhov ua rau plating qhov chaw vim yog pickling, hnyav, thiab ziab, tab sis tsuas yog tsom rau cov laj thawj rau plating qhov chaw thaum kub-dip galvanizing.
(1) Txhuas ntxiv rau zinc kua reacts nrog oxygen nyob rau hauv cov huab cua los ua txhuas oxide. Kev ntsuam xyuas tau pom tias zinc tshauv ntawm qhov nkag uas cov yeeb nkab steel nkag mus rau zinc kua muaj li ntawm 15.2% txhuas oxide. Nrog lub melting point ntawm 2050 degree thiab tsawg ntom ntawm tsuas yog 3. Qhov ceev ntawm 5.606 kg / L. Ntawm qhov kub ntawm kev khiav hauj lwm ntawm 480-510 degree, qhov ceev ntawm zinc kua yog 6.54-6.79 kg/L. Yog li ntawd, qhov qis-density aluminium oxide ib txwm nyob rau saum. Yog hais tias cov kuab tshuaj-coated steel yeeb nkab tsis qhuav los yog tau raug huab cua rau lub sij hawm ntev tom qab ziab, cov kuab tshuaj yuav damp dua. Thaum cov yeeb nkab steel nkag mus rau cov kua zinc, nws thawj zaug hu rau txhuas oxide thiab tom qab ntawd zinc oxide (zinc tshauv). Cov tshuaj no ua raws li qhov chaw ntawm cov yeeb nkab steel, hlawv tawm cov kuab tshuaj thiab ua rau tsis muaj plating.
(2) thaum pib pib thiab luam tawm, txhuas uas muaj ceev qis floats nyob rau saum npoo ntawm cov zinc kua vim li cas ntev. Thaum cov kuab tshuaj-coated steel yeeb nkab tiv tauj nws, cov tshuaj tiv thaiv hauv qab no tshwm sim tam sim ntawd:
2Al + 3ZnCl₂ → 2AlCl₃ + 3Zn
Raws li pom, cov reactive aluminium tam sim ntawd hloov zinc nyob rau hauv cov kuab tshuaj compound, tsim txhuas chloride (AlCl₃), uas sublimates ntawm 178 degree. Ib yam li ntawd, txhuas reacts nrog ammonium chloride nyob rau hauv cov kuab tshuaj los ua AlCl₃·NH₃, uas boils thiab evaporates ntawm ib ncig ntawm 400 degree. Cov tshuaj tiv thaiv no ua rau poob ntawm cov tshuaj chlorine, uas pab hauv galvanizing, ua rau plating qhov chaw.
(3) Zinc kua kub yog feem ntau siab dua thaum pib pib. Thaum cov kuab tshuaj tiv tauj cov kua zinc, nws tsis muaj sijhawm txaus los ua kom tiav nws cov txheej txheem tshuaj tiv thaiv ntawm lub cev adsorption thiab compounding, tsim degraded cov kuab tshuaj residue uas poob nws cov hauj lwm zoo, ua rau plating me ntsis.
(4) Thaum cov yeeb nkab uas hnyav-coated steel raug yuam mus rau hauv cov kua zinc siv cov clamps lossis turntables rau dipping, cov cuab yeej no tuaj yeem ua rau cov yeeb yaj kiab hnyav ntawm cov yeeb nkab steel rau ntau qhov sib txawv. Yog li ntawd, thaum nyob rau hauv kev sib cuag nrog zinc kua, qhov chaw no poob nws lub peev xwm galvanizing, ua rau plating me ntsis.
(5) Pib ntau lawm ua ntej mus txog qhov txheej txheem kub, nrog rau qis zinc kua kub, tsis ncua lub sij hawm zinc dipping, thiab ib tug loj concentration ntawm txhuas nyob rau saum npoo, cov tshuaj tiv thaiv ntawm hlau thiab zinc yog qeeb. Ib txheej hlau-zinc alloy tsis tuaj yeem tsim nyob rau lub sijhawm luv luv, yog li cov chaw tsis muaj coated tuaj yeem pom ntawm cov yeeb nkab steel tom qab dipping.
(6) Yog hais tias cov ntsiab lus txhuas nyob rau hauv lub lauj kaub galvanizing ntau dhau thiab cov zinc kua kub tsis ruaj tsis khov, ntau cov khoom ntawm Fe-Al-Zn compounds yuav raug tshem tawm hauv cov kua zinc. Thaum cov yeeb nkab steel hla dhau, cov khoom siv no ua raws li qhov chaw ntawm cov yeeb nkab steel, ua rau qhov chaw roughness defects.
Kev daws:
(1) Thaum pib, cov ntsiab lus txhuas hauv cov kua zinc yuav tsum qis dua thaum lub sijhawm tsim khoom. Maj mam nce nws mus rau theem txheej txheem raws li kev tsim khoom normalizes.
(2) Nquag txhuam cov zinc tshauv rau saum npoo ntawm cov kua zinc ntawm cov yeeb nkab steel nkag.
(3) Cov kuab tshuaj coated ntawm cov yeeb nkab steel yuav tsum qhuav thiab tsis ntub los yog tsis qhuav.
(4) Qhov kub ntawm cov kua zinc hauv lub lauj kaub galvanizing yuav tsum tsis txhob siab dhau lossis qis dhau.
(5) Tsis txhob khawb cov kuab tshuaj coated ntawm cov yeeb nkab steel thaum thauj.
(6) Cov yeeb nkab steel yuav tsum tau dipped rau hauv cov kua zinc ntawm lub kaum ntse ntse kom tsis txhob dov ntawm zinc kua nto.
