Yiw, wubetumi adi nkonim powder coat galvanized dade de ayɛ robust 'duplex nhyehyɛe' ma a ɛkorɔn corrosion resistance. Sɛ wɔde nneɛma abien a ɛsono emu biara a ɛbɔ wɔn ho ban yi bom a, ɛma wonya afɛfɛde a wɔde wie a ebetumi atra ase wɔ mfiridwuma mu nneɛma a emu yɛ den mu.
Nanso, nea wɔde galvanized ayɛ foforo no nsiesiee ne ho fi awosu mu sɛ wɔde powder bɛkata so afi aguaree no mu pɛɛ. Sɛ woansiesie wo honam fam ne nnuru a emu yɛ den wɔ soro a, akyinnye biara nni ho sɛ wo ahobammɔ a wode bɛkata so no behu amane wɔ outgassing, pinholing, ne catastrophic delamination ho. Worentumi mfa powder petepete zinc so kɛkɛ na woahwɛ kwan sɛ ɛbɛbata ho bere tenten.
Saa akwankyerɛ yi bubu mfiridwuma mu ntease a ɛwɔ duplex coatings akyi ne afiri a ɛtaa ba a ɛsɛ sɛ wokwati no mu. Yɛbɛhwehwɛ ASTM ahosiesie nhyehyɛe a ɛyɛ katee a ɛho hia ma adhesion a emu yɛ den no mu. Yɛde nhwehwɛmu gyinapɛn nso bɛma de aboa wo ma woakyerɛ nneɛma a wɔde powder akata so yiye ama wo adansi anaa nneɛma a wobɛyɛ adwuma a edi hɔ no.
Nneɛma Titiriw a Wɔde Kɔ
2.5x Multiplier: Sɛ wɔde powder a wɔde kata so ne hot-dip galvanizing bom a, ɛma wonya tumi a ɛyɛ adwuma bom, na ɛtrɛw dade no nkwa nna mu kodu mpɛn 2.5 sen nea wɔde kata so no mu biara nkutoo.
Ahunahuna a Ɛma Mframa a Ɛrefi Mu: Nsu ne mframa a akyea wɔ zinc a ɛwɔ mu no bɛtrɛw bere a powder reyɛ no, na ɛde pinholes aba. 'pre-baking' a ɛyɛ ahyɛde no nkutoo ne ade a wotumi de ho to so a wɔde bɛbrɛ ase.
Oxidation Window no: Zinc yɛ nea ɛyɛ adwuma yiye. Sɛ wɔyɛ profile wie a, ɛsɛ sɛ wɔde kata nneɛma a wɔde galvanized ayɛ no so wɔ adwuma bere koro no ara mu (sɛ ɛbɛyɛ yiye a, ɛnyɛ nnɔnhwerew 12) na amma zinc oxide a aniwa nhu no ankɔ so.
Standard Compliance: Sɛ wɔde di dwuma yiye a, ɛhwehwɛ sɛ wodi ASTM D7803 ne SSPC-SP 16 akwankyerɛ a ɛfa sɛnea wɔde siesie asase ani no so denneennen.
1. Adwumayɛ ho Asɛm: Dɛn Nti na Wɔde Sika To Duplex System Mu?
Nkitahodi a ɛda powder coatings ne zinc layers ntam no ntease ho hia yiye. Wobɔ synergistic protective effect bere a woka wɔn bom no. Polyester anaa epoxy powder no yɛ adwuma sɛ honam fam akwanside a ɛyɛ den. Ɛpam nsu, nnuru a ano yɛ den, ne nipadua mu akisikuru. Sɛ nsensanee a emu dɔ bu akwanside yi so a, zinc a ɛwɔ ase no yɛ adwuma. Ɛma anodic ahobammɔ a wɔde bɔ afɔre, na edi kan sɛe na ama dade a ɛda hɔ kwa no ayɛ nea asiane biara nni ho.
Saa kwan a wɔfa so yɛ nneɛma abien yi brɛ asetra mu nsiesie kyinhyia ahorow ase kɛse. Sɛnea ɛte biara no, ɛka a wɔbɔ wɔ nneɛma a wɔde gu so mfiase no yɛ kɛse sen ɔkwan biako a wɔfa so kata so. Nanso, nsiesie a ɛkɔ so no so tew kɛse no ma duplex nhyehyɛe ahorow no yɛ nea ɛho ka sua kɛse. Nneɛma a wɔde yɛ adwuma ne adansi ho adwuma nya mfaso kɛse fi saa bere tenten a ɛtra hɔ kyɛ yi mu. Ɛntaa mma sɛ ɛho behia sɛ woto adwumayɛ mu esiane sɛ wobɛsan ayɛ paint foforo anaasɛ wobɛtew nkannare so a wonhwɛ kwan nti.
Nneɛma a ɛbɛkɔ so atra hɔ daa nso di dwuma titiriw wɔ nnɛyi nneɛma pɔtee a wɔkyerɛkyerɛ mu. Ɛkame ayɛ sɛ powder a wɔde kata so no mma Volatile Organic Compound (VOC) a wɔtow gu no sua koraa. Bio nso, ɛnyɛ den sɛ wɔbɛkyere biribiara a wɔde petepete so dodo na wɔasan de adi dwuma bio. Nneɛma a wɔde powder akata so a wɔde bedi dwuma no betumi aboa tẽẽ ma wɔanya LEED adansedi krataa, titiriw wɔ nneɛma a atwa yɛn ho ahyia a ɛwɔ dan mu no yiyedi ho. Nhyehyɛefo bu adansi nneɛma a mframa bɔne pii nsɛe yi kɛse.
Awiei koraa no, duplex nhyehyɛe ahorow ma wotumi de nneɛma pii di dwuma kɛse. Application no scales fɛfɛɛfɛ wɔ project akɛseɛ ahodoɔ mu. Wubetumi de ahyɛ dade a wɔde ayɛ adan akɛse a wɔde batch akata so no so. Wubetumi nso de adi dwuma wɔ continuous so galvanized dade coil a wɔde yɛ adwuma. Nneɛma pii a wɔde yɛ nneɛma a wɔde wɔn ankasa yɛ no de wɔn ho to so galvanized dade krataa nneɛma a ɛba pre-coated na wɔasiesie ama fabrication.
2. Engineering Nsɛnnennen Titiriw: Outgassing ne Reactive Zinc
Sɛ wɔde powder gu dade a wɔde galvanized ayɛ a ɛyɛ hyew so a, ɛde mfiridwuma mu akwanside pɔtee bi ba. Asɛm a ɛda nsow sen biara ne outgassing phenomenon no. Bere a wɔreyɛ galvanizing no, kotoku nketenkete a nsu ne mframa wom no kyekyere zinc a ɛwɔ abon no ani. Akyiri yi, ɔfã no hyɛn fononoo a wɔde sa yare mu ma ɛyɛ powder a wɔde akata so no. Saa fononoo yi taa tu mmirika bɛyɛ 180°C (356°F).
Bere a dade no mu yɛ hyew no, mframa a akyea no trɛw ntɛmntɛm. Wɔhyɛ wɔn kwan kɔ abɔnten fa polyester anaa epoxy a ɛrewosow no mu. Saa guankɔbea a basabasayɛ wom yi ma ahurututu, amena, ne pinholes a wotumi hu ba. Saa pinholes yi sɛe afɛfɛde a wɔde wie no. Nea enye koraa no, wɔma nsu kwan tẽẽ fa powder akwanside a ɛbɔ ho ban no ho.
Asɛnnennen titiriw foforo fa zinc oxide afiri a aniwa nhu no ho. Zinc yɛ dade a ɛyɛ adwuma yiye. Efi ase yɛ oxidizing ntɛm ara bere a ɛde ne ho ahyɛ wim oxygen mu no. Nnipa dodow no ara hu 'white rust' sɛ zinc oxidation ho sɛnkyerɛnne. Nanso, zinc oxide a ɛyɛ nketenkete no ba bere tenten ansa na nkannare fitaa apue. Saa ade a aniwa nhu yi yɛ adwuma te sɛ mfutuma kyɛm a wɔde hwɛ ade ketewaa bi. Sɛ wɔansa a, ɛsɛe powder coating adhesion koraa.
Onyin a ɛsakra no ma wo ahosiesie nhyehyɛe no yɛ den bio. Ɛsɛ sɛ wo sesa ɔkwan a wobɛfa so ayɛ no gyina mfe pɔtee a zinc no ani adi so. Dade a wɔde galvanized ayɛ foforo (a enni nnɔnhwerew 48) hwehwɛ sɛ wɔde di dwuma wɔ ɔkwan soronko so koraa sen zinc a wim tebea asɛe no fã bi (a ɛda adi kosi afe biako). Zinc foforo hia aggressive surface profiling. Zinc a asɛe no hwehwɛ sɛ wode nnuru siesie mu denneennen na ama woayi hydroxides ne carbonates a ɛyɛ den no afi hɔ ansa na woafi ase mpo ayɛ profiling.
3. ASTM D7803 Ahosiesie Gyinapɛn a Ɛfa Asiane a Wɔbɛtew So
Sɛnea ɛbɛyɛ a woasiw delamination ne pinholing ano no, ɛsɛ sɛ wudi anammɔn pɔtee a wɔakyerɛ wɔ ASTM D7803 mu no akyi. Saa gyinapɛn yi kyerɛ sɛnea wobesiesie nneɛma a wɔde kata so a wɔde ɔhyew afra mu a wɔde powder ayɛ no yiye.
Anamɔn 1: Nnuru ne Nnuru a Wɔde Tew Ahotew
Ɛsɛ sɛ wudi kan yi efĩ a ɛwɔ abɔde mu, ngo, ne srade nyinaa fi hɔ. Nipadua mu sintɔ te sɛ akuturuku, mmirikatu, ne zinc a ɛtɔ nso hwehwɛ sɛ wɔde ahwɛyiye twitwiw. Fa alkaline a ɛyɛ mmerɛw anaa acidic solutions a ɛyɛ mmerɛw di dwuma de hohoro nnuru ho. Mfa nnuru a ano yɛ den a ɛma ɔhyew nni dwuma da. Aggressive strippers bɛpete zinc a ɛbɔ ho ban no koraa. Bere nyinaa fa nsu a ɛho tew hohoro nea ɛwɔ soro no yiye na hwɛ hu sɛ ayow koraa ansa na woatoa so.
Anamɔn 2: Nneɛma a ɛwɔ soro (SSPC-SP 16) .
Zinc a ɛyɛ torotoro koraa ntumi nkura powder paint mu. Ɛsɛ sɛ woyɛ microscopic anchor profile. Nanso, standard heavy abrasive blasting sɛe dade a wɔde galvanized ayɛ. Ɛtetew zinc no fi dade a ɛwɔ ase no so pɛɛ.
Mmom, SSPC-SP 16 gyinapɛn no hwehwɛ sɛ wɔde 'Sweep Blasting' kwan pɔtee bi di dwuma. Ɛsɛ sɛ wɔn a wɔyɛ adwuma no de abrasives a ɛnyɛ dade, a ɛnyɛ den pii (Mohs scale hardness ≤ 5) di dwuma. Ahwehwɛ anaa walnut akorade a wɔabubu no yɛ adwuma pɛpɛɛpɛ. Ɛsɛ sɛ blast nozzle no kɔ so tra 30° kosi 60° anim a ɛnyɛ den. Saa adeyɛ a wɔde popa nneɛma a wɔde ahwɛyiye yɛ yi kyerɛw nea ɛwɔ soro no brɛoo. Ɛma nsɛntitiriw a ɛho hia ba a ɛnyi zinc kronkron (Eta) a ɛho hia a ɛwɔ soro no mfi hɔ. Nnwumayɛbea ahorow bi nso de nnuru a wɔde yɛ nhwehwɛmu denam zinc anaa iron phosphate ayaresa so di dwuma sɛ ɔkwan a ɛfata a wɔfa so si sweep blasting ananmu.
Anamɔn 3: Ɔhyew a Wɔde Fi Mframa Mu (Pre-Baking) .
Eyi ne wo anammɔn a ɛho hia a wode bedi asiane ho dwuma a wode besiw mframa a efi mu ba ano. Ansa na wode powder biara bɛhyɛ wo ho no, ɛsɛ sɛ wudi kan to dade a ɛda hɔ kwa a wɔayɛ no profile no. Ɛsɛ sɛ wɔde fononoo hyew no si hɔ 30°C (~50°F) sen ɔhyew a etwa to a wɔde yɛ powder curing no. Ɛsɛ sɛ wode dade no kura ɔhyew a ɛkɔ soro yi mu anyɛ yiye koraa no dɔnhwerew biako.
Saa ɔhyew a ano yɛ den yi hyɛ nsu ne mframa a wɔakyere no ma ɛtrɛw na woguan bere a dade no da so ara da hɔ no. Edu bere a wode powder ankasa no bɛhyɛ mu no, na ntini nketenkete no mu da mpan koraa. Wɔrenpae wɔ bere a etwa to a wɔde sa yare no mu.
Anamɔn 4: Nneɛma a Wɔde Di Dwuma Ntɛmntɛm (Bere Mfɛnsere) .
Bere yɛ wo tamfo kɛse bere a asase ani ho tew na wɔayɛ no profile no. Wohyia bere mfɛnsere a ɛyɛ katee a wode bɛhyɛ anti-outgassing primer ne topcoat a etwa to no. Nnwuma gyinapɛn ahorow hwehwɛ sɛ wɔde di dwuma wɔ nnɔnhwerew 12 akyi wɔ profiling akyi. Sɛnea ɛbɛyɛ yiye no, ɛsɛ sɛ wuwie adeyɛ no nyinaa wɔ adwuma bere koro no ara mu pɛpɛɛpɛ. Sɛ wokyɛ sɛ wode gu so a, ɛma zinc oxide a aniwa nhu no tumi yɛ nsakrae, na ɛno bɛma wo a ɛbata ho no ayɛ basaa ntɛm ara.
Nsɛm a Wɔaboaboa Ano Ho Nhyehyɛe: ASTM D7803 Ahosiesie Nsuo
Anamɔn |
Adeyɛ no Edin |
Adeyɛ Titiriw |
Botae Titiriw |
1 |
Nnuru a Wɔde Tew Nneɛma Ho |
Fa alkaline/acidic aduru a ɛyɛ mmerɛw gu so |
Yi ngo, organics, ne honam fam zinc a ɛtɔ gu fam no fi hɔ. |
2 |
Sweep Blasting a Ɛyɛ Fɛ |
Fa Mohs ≤ 5 abrasives di dwuma wɔ 30°-60° anim |
Yɛ mfiri anchor profile a worenhwere zinc. |
3 |
Ɔhyew a Wɔde Fi Mframa Mu |
Tow wɔ +30°C a ɛboro cure temp so dɔnhwerew 1 |
Hyɛ mframa a wɔde kyekyere mframa no na amma pinholes daakye. |
4 |
Nneɛma a Wɔde Di Dwuma Ntɛmntɛm |
Fa powder gu so wɔ nnɔnhwerew 12 ntam |
Siw zinc oxide a aniwa nhu no kwan sɛ ɛnsɛe ade a ɛbata ho no. |
4. Galvanized vs. Galvannealed Steel: Ɛkyerɛ Substrate a Ɛfata
Nneɛma a wɔkyerɛkyerɛ mu no nya wo duplex nhyehyɛe no nkonimdi so nkɛntɛnso kɛse. Ɛsɛ sɛ wote nsonsonoe a ɛda dade a wɔde galvanized a wɔde hyɛ mu a ɛyɛ hyew a wɔtaa de di dwuma ne dade a wɔde galvannea ayɛ ntam no ase. Standard hot-dip galvanizing ma wonya zinc a ɛda nsow a ɛho tew a ɛwɔ soro. Ɛtaa da spangle nsusuwso a wotumi hu adi. Galvannealing de annealing (ɔhyew) kwan foforo ka ho ntɛm ara wɔ zinc aguaree no akyi.
Saa ɔhyew a ɛboro so yi ma dade a efi dade a ɛwɔ ase no mu no trɛw kɔ soro kɔ zinc no mu. Ɛma wonya zinc-dade a wɔde afrafra a ɛyɛ den. Eyi sesa sɛnea wohu no ma ɛyɛ matte grey finish. Nea ɛho hia sen saa no, ɛsakra sɛnea ɔfasu no kata so no kɛse.
Galvannealed dade no wɔ abɔde mu micro-rough surface. Ɛyɛ adwuma te sɛ sponge a wɔde hwɛ ade ketewaa bi. Paint ne powder a wɔde kata so no bata saa aduru yi ho ntɛmntɛm. Ne saa nti, mpɛn pii no, nneɛma a wɔde galvannea ayɛ no nhia sɛ wɔde popa a wɔde popa nneɛma a ano yɛ den kɛse koraa bere a wɔde toto nneɛma a wɔde di dwuma wɔ ɔhyew mu a wɔtaa de di dwuma ho no. Asiane a ɛwɔ delamination mu no so tew kɛse.
Ɛsɛ sɛ adetɔfo susuw nsonsonoe ahorow yi ho yiye bere a wɔrehwehwɛ fibea no. Gyinapɛn a wɔkyerɛ Galvanized Steel ma adan a emu yɛ duru a ɛho hia sɛ wɔde zinc a wɔde bɔ afɔre kɛse no yɛ kɛse. Wɔtaa pɛ Nanso, sɛ woreyɛ mfiri a wɔde yɛ nneɛma a ɛyɛ pɛpɛɛpɛ anaa kar afã horow a, kyerɛ nneɛma a wɔde galvannealed ayɛ mmom. Ɛma wotumi yɛ paintability a ɛkorɔn tẽẽ fi line no so, na ɛtew wo nnuru a wode siesie ho ka so.
Nneɛma a Wɔde Toto Ho Table
Su |
Standard Galvanized Dade a Wɔde Yɛ Nneɛma |
Dade a Wɔde Galvannea ayɛ |
Susutwerɛ |
Zinc a ɛho tew akyi fã (Eta layer) . |
Zinc-dade aduru a ɛwɔ soro |
Mmaeɛ |
Ɛhyerɛn, mpɛn pii no ɛda adi sɛ spangle a wotumi hu |
Matte grey, nwene a ɛyɛ pɛ |
Powder Affinity a Wɔde Di Dwuma |
Ɛhwehwɛ sɛ sweep blasting profile a ɛyɛ katee |
Sɛnea ɛte no, ɛyɛ micro-rough; mfitiaseɛ adhesion a ɛkorɔn |
Nea eye sen biara Ma |
Heavy infrastructure, afɔrebɔ layer a ɛyɛ den ahiade |
Automated lines, nneɛma a wɔayɛ ho adwini a ɛyɛ fɛ yiye |
5. Adetɔnfo Nhwehwɛmu: Sɛnea Wɔbɛkyerɛw Ɔhokafo a Ɔde Kata Ho Tiatiaa
Sɛ wɔde powder bɛhyɛ zinc so a, ɛhwehwɛ sɛ wɔde nnwinnade titiriw ne mfiridwuma ho nimdeɛ a emu dɔ. Mpɛn pii no, powder coater ahorow a wɔde kata so no sɛe afã horow a wɔde galvanized ayɛ no efisɛ ɛne no di te sɛ dade a ɛda hɔ kwa. Ɛsɛ sɛ wohwehwɛ wɔn a wobetumi atɔn nneɛma no mu yiye ansa na wode apam bi ama.
Bisa QA nsɛmmisa a ɛho hia yi wɔ wo nhwehwɛmu nhyehyɛe no mu:
So wɔwɔ fononoo a wɔahyira so a wɔde di kan tow a etumi du ɔhyew a ɛho hia a ɛma mframa fi mu no ho? Sotɔɔ nketewa pii nni fononoo a ebetumi adu 30°C a ɛboro wɔn ɔhyew a wɔtaa de sa yare no so kɛkɛ.
So mmeae a wɔde galvanizing ne powder-coating yɛ no wɔ baabiara anaasɛ wɔayɛ biako kɛse? Nneɛma a wɔde kɔ amannɔne ho hia. Sɛ ɛsɛ sɛ adetɔnfo bi de lɔre fa zinc a ɛda hɔ kwa no fa ɔman no mu nyinaa a, ɛda adi sɛ wɔbɛpa mfɛnsere a wɔde kata so a ɛyɛ katee a wɔde nnɔnhwerew 12 kata so no.
So wɔde mfiri a wɔagye atom sɛ ɛko tia mframa a ɛmma mframa nkɔ mu di dwuma? Wɔn a wɔtɔn nneɛma a ɛyɛ papa de primer ahorow titiriw gu so bere a dade no da so ara yɛ hyew no. Eyi siw ntini no ano ansa na kɔla a etwa to no akɔ so.
Hwɛ yiye wɔ frankaa kɔkɔɔ a ɛbɛba ntɛm ara no ho. Sɛ adetɔnfo bi kyerɛ sɛ wobetumi de dade a wɔde galvanized ayɛ foforo akata so ntɛm ara a wɔmfa sweep blasting nhyɛ mu a, nantew kɔ. Sɛ wɔka sɛ thermal degassing yɛ ɛka foforo a ɛho nhia a, hwehwɛ ɔhokafo foforo. Akwan tiawa a wɔfa so yɛ adwuma no ma wɔde nneɛma a wɔde kata so no peeling bere nyinaa.
Awie
Powder a wɔde kata dade a wɔde galvanized ayɛ so no ma wonya duplex nhyehyɛe a etu mpɔn kɛse, nanso ɛda so ara yɛ adeyɛ a wɔmfa mfiri koraa. Worentumi mmu w’ani ngu abɔde mu nneɛma a ɛwɔ mframa a ɛtrɛw mu anaasɛ zinc a ɛyɛ adwuma no mu. Akyinnye biara nni ho sɛ ahosiesie a wɔde twa ɔfasu no ho a, ɛde afɛfɛde a entumi nyɛ adwuma yiye na ahobammɔ a ɛba wɔ nsɛe ho no ba.
Fa anammɔn a edi hɔ a edidi so yi a ɛfa nneyɛe ho ma wo nnwuma a ɛreba no:
To ASTM D7803 ne SSPC-SP 16 ahosiesie ahwehwɛdeɛ no mu tẽẽ wɔ wo Request for Proposals (RFPs) no mu.
Hwehwɛ adanse a wɔakyerɛw ato hɔ a ɛkyerɛ sɛnea wɔde dɔnhwerew 1 de gas fi mu ansa na wɔatow no afi nea woapaw no hɔ.
Hwɛ sɛ nkitahodi a ɛda adi pefee, bere ankasa mu wɔ hot-dip galvanizer ne powder applicator no ntam na ama woanya awerɛhyem sɛ wobedi nnɔnhwerew 12 a wɔde di dwuma mfɛnsere no ho dwuma.
Hwɛ sɛ sweep blasting nyinaa de abrasives a ɛnyɛ den pii di dwuma de bɔ zinc akwanside a ɛho hia no ho ban.
FAQ
Asɛmmisa: So dade a wɔde galvanized ayɛ a wɔde powder akata so no yɛ nwunu?
A: Ɛyɛ nea ɛko tia nkannare kɛse. Mpɛn pii no, sɛ wɔde ade a wɔde kata so no mu kɔ akyiri twa akwanside no ne zinc a ɛwɔ so no nyinaa ho nkutoo a, na nkannare ba. Ebetumi aba nso sɛ ɔhyew a ano yɛ den a ɛboro 250°C (480°F) a ɛkɔ so ma zinc a ɛwɔ ase no di nkogu a.
Asɛmmisa: So wubetumi de powder ahyɛ dade dedaw a wɔde galvanized ayɛ a wim tebea asɛe no so?
A: Yiw, nanso egye nnuru a emu yɛ duru kɛse a wɔde tew ho. Ɛsɛ sɛ wode alkaline anaa acidic solutions soronko yi zinc hydroxides ne carbonates (patina a ɛyɛ fitaa no) koraa ansa na wɔatumi ayɛ dade no profile dwoodwoo na wɔadi kan ato.
Asɛmmisa: Sɛ wuhuw pre-bake nhyehyɛe no so a, dɛn na ɛba?
A: Mframa ne nsu a wɔakyere no befi mu denneennen bere a wɔde powder a etwa to no sa yare no. Eyi ma wonya textured, compromised finish a pinholes a wotumi hu ahyɛ mu ma. Saa pinholes yi ma nsu tumi twa powder akwanside no ho koraa, na edi atirimpɔw a ɛwɔ duplex nhyehyɛe no mu no so nkonim.
