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Nheyo yechizvarwa chekupisa-dip galvanized coating
Kupisa dip galvanizing inzira ye metallurgical chemical reaction. Kubva pakuona kwemicroscopic, maitiro ekupisa-dip galvanizing anosanganisira maviri ane simba akaenzana: thermal equilibrium uye zinc iron exchange equilibrium. Kana zvikamu zvesimbi zvakanyudzwa muzinc yakanyungudutswa inosvika 450 ℃, zvikamu zvesimbi patembiricha yekamuri zvinotora kupisa kwemvura yezingi. Kana tembiricha yadarika 200 ℃, kudyidzana pakati pezinc nesimbi zvishoma nezvishoma kunova pachena, uye zinc inopinda nepamusoro pechikamu chesimbi simbi.

Sezvo tembiricha yesimbi inosvika zvishoma nezvishoma tembiricha ye zinc fluid, alloy layers ane akasiyana zinc iron ratios anoumbwa pamusoro pedenga resimbi, achigadzira dhizaini yezvinc coating. Nekufamba kwenguva, akasiyana alloy layers mucoating anoratidza mazinga akasiyana ekukura. Kubva pamaonero makuru, maitiro ari pamusoro anoratidza sezvikamu zvesimbi zviri kunyudzwa mumvura ye zinc, zvichikonzera kufashaira kwemvura ye zinc. Sezvo zinc iron reaction ichiita zvishoma nezvishoma yakaenzana, iyo zinc liquid surface inodzikama zvishoma nezvishoma.
Kana chidimbu chesimbi chinosimudzwa kusvika kune zinc fluid level, uye tembiricha yesimbi inodzikira zvishoma nezvishoma kusvika pazasi 200 ℃, iyo zinc iron kemikari inomira inomira, uye inopisa-dip galvanized coating inoumbwa, nehupamhi hwakatemwa.
Iko kukobvu kunodiwa kune inopisa-dip galvanized coatings
Zvinhu zvikuru zvinokanganisa kukora kwe zinc coating zvinosanganisira: substrate simbi kuumbwa, kushata kwesimbi, zvirimo uye kugoverwa kwezvinhu zvinoshanda nesilicon uye phosphorus musimbi, kushushikana kwemukati kwesimbi, geometric dimensions yezvikamu zvesimbi, uye inopisa-dip galvanizing process.
Iyo yazvino yepasirese uye yeChinese inopisa-dip galvanizing zviyero zvakakamurwa kuita zvikamu zvichienderana nekukora kwesimbi. Ukobvu hwepasirese uye hwepanzvimbo hweiyo zinc coating hunofanirwa kusvika pahukobvu hunoenderana kuti utarise kushora kwekudzivirira kwe zinc coating. Nguva inodiwa kuti uwane thermal equilibrium uye yakagadzikana zinc iron exchange equilibrium inosiyana kune zvikamu zvesimbi zvine ukobvu hwakasiyana, zvichikonzera kukora kwakasiyana. Avhareji yekuputira ukobvu muyero yakavakirwa pane yeindasitiri yekugadzira ruzivo kukosha kweiyo inopisa-dip galvanizing musimboti wataurwa pamusoro, uye ukobvu hwenzvimbo ndiyo kukosha kwechiitiko kunodiwa kufunga kusaenzana kugoverwa kwe zinc coating ukobvu uye zvinodiwa zvekupotera corrosion kuramba. .

Naizvozvo, ISO zviyero, American ASTM zviyero, Japanese JIS zviyero, uye Chinese zviyero zvine zvishoma zvakasiyana zvinodiwa kune zinc coating ukobvu, uye mutsauko hauna kukosha.
Mhedzisiro uye pesvedzero yekupisa-dip galvanized coating ukobvu
Ukobvu hwekupisa-dip galvanized coating hunotaridza kushora kwezvikamu zvakaputirwa. Kuti uwane kukurukurwa kwakadzama, ndapota tarisa kune yakakodzera data yakapihwa neAmerican Hot Dip Galvanization Association mune yakanamatira. Vatengi vanogona zvakare kusarudza zinc coating ukobvu iyo yakakwira kana yakaderera pane yakajairwa.
Zvakaoma kuwana jira rakakora mukugadzirwa kwemaindasitiri kune mahwendefa esimbi matete ane yakatsetseka pamusoro pe3mm kana pasi. Uye zvakare, iyo zinc yekuputira ukobvu isina kuenzana nehupamhi hwesimbi inogona kukanganisa kunamatira pakati pekuputira uye substrate, pamwe nekuonekwa kwemhando yekupfeka. Iyo yakakora yakawandisa yakakora inogona kuita kuti chitarisiko chejasi chive chakakasharara, chinoda kusvuura, uye zvikamu zvakapfava hazvigone kumira kudhumhana panguva yekufambisa nekuisa.
Kana paine akawanda anoshanda zvinhu zvakaita sesilicon uye phosphorus musimbi, zvakare zvakanyanya kuoma kuwana matete machira mukugadzirwa kwemaindasitiri. Izvi zvinodaro nekuti iyo silicon yemukati musimbi inokanganisa nzira yekukura yezinc iron alloy layer, izvo zvinozoita kuti zeta phase zinc iron alloy layer ikure nekukurumidza uye kusundira zeta chikamu chakanangana nepamusoro pedenga rejasi, zvichikonzera hutsinye uye dull surface layer yejasi, ichiita grey yakasviba coating nekunamira kwakashata.
Nokudaro, sezvakakurukurwa pamusoro apa, pane kusava nechokwadi mukukura kwekupisa-dip galvanized coatings. Muchokwadi, kazhinji zvinonetsa kuwana imwe mhando yehukobvu hwekufukidzira mukugadzirwa, sekutsanangurwa kweiyo inopisa-dip galvanized zviyero.
Ukobvu chinhu cheempirical chinogadzirwa mushure mehuwandu hukuru hwekuyedza, tichifunga zvakasiyana siyana uye zvinodiwa, uye zvine hungwaru uye zvine musoro.