Chii chinonzi hot-dip coatings?
Kune akawanda marudzi ekupisa-dip coatings esimbi mahwendefa uye mitsetse. Mitemo yekuisa muzvikamu zvakakura-kusanganisira America, Japan, European, uye Chinese yenyika zviyero zvakafanana. Isu tichaongorora tichishandisa European standard EN 10346: 2015 semuenzaniso.
Mainstream hot-dip coatings inowira muzvikamu zvitanhatu zvikuru:
- Kupisa-dip pure zinc (Z)
- Hot-dip zinc-iron alloy (ZF)
- Kupisa-dip zinc-aluminium (ZA)
- Kupisa-dip aluminium-zinc (AZ)
- Kupisa-dip aluminium-silicon (AS)
- Kupisa-dip zinc-magnesium (ZM)
Tsanangudzo uye maitiro emhando dzakasiyana-siyana dzinopisa-dip coatings
Matare esimbi asati agadzirwa anonyudzwa mubhavhu rakanyungudutswa. Yakasiyana simbi yakanyungudutswa mubhati inobereka mavara akasiyana (kunze kwezinc-iron alloy coatings).
Kuenzanisa Pakati Pekupisa-Dip Galvanizing uye Electrogalvanizing
1. Galvanizing Process Overview
Galvanizing inoreva nzira yekurapa pamusoro pekuisa zingi yekunamira kune simbi, alloys, kana zvimwe zvinhu zvekunakisa uye anti-corrosion zvinangwa. Nzira dzinoshandiswa zvakanyanya ndedzekupisa-dip galvanizing uye kutonhora kunopisa (electrogalvanizing).
2. Kupisa-Dip Galvanizing Process
Nzira yekutanga yekunamisa simbi yesimbi nhasi ndeyekupisa-dip galvanizing. Kupisa-dip galvanizing (inozivikanwawo sehot-dip zinc coating kana inopisa-dip galvanization) inzira inoshanda yekudzivirira ngura yesimbi, inonyanya kushandiswa pazvivakwa zvesimbi mumaindasitiri akasiyana siyana. Zvinosanganisira kunyudza zvinhu zvesimbi zvakabviswa ngura muzinc yakanyungudutswa inenge 500°C, kuisa zinc layer pamusoro pesimbi kuti iwane kusimba. Kupisa-dip galvanizing process kuyerera: Yapedza chigadzirwa kugeza asidhi → Kugezesa mvura → Kushandiswa kweflux → Kuomesa → Kurembera pakupotera → Kutonhodza → Kurapa nemakemikari → Kuchenesa → Kupukuta → Kupisa-dip galvanizing yakakwana.
3. Cold-dip Galvanizing Process
Cold galvanizing, inozivikanwawo se electrogalvanizing, inoshandisa electrolytic midziyo. Mushure mekudzikisa uye kugezwa kweasidhi, zvigadziriso zvepombi zvinoiswa mune mhinduro ine zinc munyu uye yakabatana neiyo yakaipa terminal ye electrolytic midziyo. Zinc ndiro yakamira yakatarisana nemidziyo uye yakabatana kune yakanaka terminal. Kana simba rikaiswa, mafambiro anotungamirwa ezvino kubva kune yakanaka kuenda kune yakaipa anokonzeresa kuti zinc iise pane zvigadziriso. Cold-galvanized pipe fittings inogadziriswa isati yaitwa galvanization.
Tekinoroji zviyero zvinoenderana neASTM B695-2000 (US) uye zvechiuto zvakatemwa C-81562 zvemakanika galvanization.
Kuenzanisa kweHot-Dip Galvanizing vs. Cold-Dip Galvanizing
Kupisa-dip galvanizing kunopa yakanyanya kukwirisa kuomarara kupfuura kutonhora-dip galvanizing (inozivikanwawo se electrogalvanizing). Electrogalvanized coatings anowanzo kubva pa5 kusvika 15 μm muhukobvu, nepo kupisa-dip galvanized coatings kazhinji inodarika 35 μm uye inogona kusvika ku200 μm. Kupisa-dip galvanizing inopa kuvharika kwepamusoro neyakaomeswa coating isina organic inclusions. Electrogalvanizing inoshandisa zinc-filled coatings kudzivirira simbi kubva mukuora. Aya machira anoshandiswa kune yakadzivirirwa pamusoro pekushandisa chero nzira yekuputira, ichigadzira zinc-yakazara layer mushure mekuoma. Iyo yakaomeswa yakaomeswa ine yakakwira zinc content (kusvika 95%). Simbi inoiswa zinc plating pamusoro payo pasi pemamiriro akatonhodzwa, nepo kupisa-dip galvanizing kunosanganisira kuvhara pombi dzesimbi nezingi kuburikidza nekunyudzwa kwedip inopisa. Iyi nzira inobereka kunamatira kwakasimba, zvichiita kuti iyo yekuputira isanyanya kusvuuka.
Nzira yekusiyanisa sei kupisa-dip galvanizing kubva kunotonhora galvanizing?
1. Visual Identification
Kupisa-dip galvanized surfaces kunoratidzika kunge kwakashata zvishoma, kunoratidza maitiro-anokonzeresa watermarks, madrips, uye nodules-kunyanya kuoneka kune imwe mugumo weworkpiece. Chitarisiko chose chine silvery-white.
Electrogalvanized (inotonhora-galvanized) nzvimbo dzakapfava, kunyanya yero-girini muruvara, kunyangwe iridescent, bluish-white, kana chena ine green sheen inogonawo kuoneka. Nzvimbo idzi dzinowanzoratidza pasina zinc nodules kana clumping.
2. Kusiyanisa neMaitiro
Kupisa-dip galvanizing kunosanganisira matanho akati wandei: kudzikisa, kunhonga asidhi, kunyudzwa kwemakemikari, kuomesa, uye pakupedzisira kunyudzwa mu zinc yakanyungudutswa kwenguva yakati isati yabviswa. Iyi nzira inoshandiswa kune zvinhu zvakaita semapaipi anopisa-dip.
Cold galvanizing, zvisinei, ndeye electrogalvanizing. Inoshandisa midziyo ye electrolytic uko iyo workpiece inodonha uye kunhonga isati yanyudzwa mune zinc munyu mhinduro. Yakabatanidzwa kune electrolytic apparatus, iyo workpiece inoisa zinc layer kuburikidza neinotungamirwa mafambiro ezvino pakati pezvakanaka uye zvisina kunaka electrode.
Nguva yekutumira: Oct-01-2025
