Mpɛn pii no, adwumayɛfo a wɔyɛ adwuma wɔ hɔ no bu zinc a wɔayɛ ho adwini sɛ kyakyatow kɛse. Wote nnwuma mu nsɛm a ɛfa asiane kɛse a ɛfa peeling ne adhesion huammɔdi a ɛkɔ so wɔ asram pii akyi bere a wɔawie adwuma no ho bere nyinaa. Akyinnyegye no yɛ nea ntease wom koraa. Nanso, nokwasɛm no mu da hɔ pefee: yiw, wubetumi ayɛ ho mfonini yiye. Wɔ aguadi ne mfiridwuma mu dwumadie mu no, adwumayɛfoɔ frɛ saa adeyɛ yi 'Duplex System.'.
Nneɛma a wɔde asie no yɛ kɛse. Sɛ wodi ho dwuma yiye a, paint ne galvanizing ma wonya ahobammɔ afiri a ɛyɛ adwuma bom kɛse. Sɛ woankum no yiye—mpɛn pii no denam mfiri a wɔde sanding a wɔtaa de di dwuma ne epoxy a wɔtaa de di dwuma so a wode wo ho to so—a, ɛsɛe wo sikasɛm nhyehyɛe kɛkɛ na ɛma mpɔtam hɔ nsɛe no yɛ ntɛmntɛm. Wo paint no bɛtwe afi dade no so ankasa.
Yɛyɛɛ akwankyerɛ yi sɛnea ɛbɛyɛ a yebeyi nsusuwii hunu no afi hɔ. Yɛn botae ne sɛ yɛbɛma adwumayɛfo a wɔyɛ adwuma wɔ adwumayɛbea ahorow, wɔn a wɔyɛ nneɛma a wɔakyerɛkyerɛ mu, ne akuw a wɔkra nneɛma no anya nnuru a wɔmfa varnish nhyɛ mu nokwasɛm ahorow no. Wobɛsua ahosiesie gyinapɛn pɔtee a wɔhwehwɛ, a ASTM protocol ahorow a ɛho hia ka ho. Wobɛsan nso ahu coating selection logic a ɛho hia na ama woahwɛ ahu sɛ wotumi di ho adanse, mfomso biara nni ho, na ɛtra hɔ kyɛ.
Nneɛma Titiriw a Wɔde Fa Kɔ
Adhesion gyina surface chemistry so, ɛnyɛ roughness nko: Standard mechanical sanding taa ma zinc layer no sɛe a ɛnhwɛ hu sɛ paint no bɛbata ho.
Mfe a obi adi na ɛkyerɛ ɔkwan a wɔfa so yɛ no: Zinc a wɔayɛ no foforo, a wim tebea asɛe no fã bi, na asɛe koraa no hwehwɛ sɛ wɔyɛ ahosiesie ho nhyehyɛe ahorow koraa.
Mfa alkyd anaa primers a wɔde ngo ayɛ nni dwuma da: Ɛne zinc yɛ adwuma (saponification), na ɛdan primer interface no ma ɛbɛyɛ samina a ɛyɛ hwerɛma, na ɛma ɛyɛ peeling koraa.
Hwɛ akwan foforo a wobɛfa so ayɛ adwuma ntɛm: Wɔ nhyiam ahorow a ɛyɛ pɛpɛɛpɛ kɛse a ɛyɛ mmerɛw sɛ ɔhyew bɛkyinkyim ho no, ebia primer ahorow a zinc pii wom a ɛyɛ adwuma yiye wɔ dade a ɛda hɔ kwa so no bɛma wɔanya ROI a eye sen hot-dip galvanizing (HDG) a wɔde paint aka ho.
Adwumayɛ ho asɛm a ɛfa 'Duplex System' ho.
Ɛsɛ sɛ yedi kan kyerɛkyerɛ Duplex System no mu na yɛate ne bo ase. Ɛyɛ ɔkwan a wɔfa so de hot-dip galvanized (HDG) coating ne nsu anaa powder soronko a wɔde kata soro. Sɛ yɛbɛtumi ayɛ yei yie a, ɛsɛ sɛ adeyɛ no nyinaa kɔ so di ASTM D6386 gyinapɛn no so pɛpɛɛpɛ. Saa gyinapɛn yi na ɛkyerɛ sɛnea wosiesie zinc a wɔde yɛ mfonini.
Mfaso titiriw a ɛwɔ nhyehyɛe yi so ne nea efi mu ba a ɛne ne ho bom yɛ adwuma. Sini a wɔde paint ayɛ a ɛwɔ akyi no yɛ adwuma sɛ akwanside. Ɛbɔ zinc a wɔde akata so no ho ban fi wim efĩ a wɔde di dwuma ntɛm no ho. Nea ɛbɛyɛ na wɔayɛ saa no, zinc a ɛwɔ ase no ma wonya cathodic ahobammɔ kɛse. Sɛ paint no twetwe anaasɛ ɛyɛ mmerɛw a, zinc no yɛ adwuma sɛ afɔrebɔ anode. Ɛmma nwura a ɛwɔ sini no ase no ntumi nkɔ, na ɛhwɛ hu sɛ nneɛma a asɛe no kɔ so tra baabiara.
Saa afiri a wɔde bɔ wɔn ho ban a ɛwɔ afã abien yi ma nkwa tenten trɛw kɛse. Mpɛn pii no, duplex nhyehyɛe no nkwa nna nyinaa yɛ nea zinc ne paint nkutoo nkwa nna mmiako mmiako no nyinaa bom mmɔho 1.5 kosi 2.5. Ɛnyɛ sɛ wunya ahobammɔ a ɛtoatoa so abien kɛkɛ; wo nya multiplier effect.
Saa ntease yi di dwuma wɔ scalability application ahorow pii mu. Wubetumi ayɛ dade a emu yɛ duru a wɔde yɛ ɔdan no ho adwuma ama abɔnten agumadibea. Nea ɛne eyi bɔ abira no, ebia wode nea wɔadi kan ayɛ bedi dwuma galvanized dade coil ne galvanized dade ntama nneɛma a wɔde yɛ adansi ho nneɛma a ɛdɔɔso. Nnuruyɛ ne ahobammɔ nnyinasosɛm ahorow a ɛwɔ ase no da so ara yɛ pɛ ɛmfa ho sɛnea nneɛma no te.
Assessing Coating Condition: Wim Tebea a Ɛyɛ Fɛ no Afã 3
Wo surface evaluation framework no kyerɛ nkonimdi anaasɛ huammɔdi. Ahosiesie protocol no gyina bere tenten a... Wɔde Galvanized Steel ahyɛ wim. Worentumi ne zinc dedaw ne zinc foforo nni dwuma ɔkwan koro no ara so.
Galvanized Foforo (Nnɔnhwerew 0 kosi 48) .
Wɔ mfɛnsere a edi kan yi mu no, dade no tebea yɛ torotoro koraa na ɛdannan kɛse. Ɛkame ayɛ sɛ zinc nnuru biara nnya nyɛɛ nea ɛwɔ soro no. Dade no nyɛ nea ɛwɔ abon koraa. Esiane sɛ enni nkyerɛwee nti, paint nni biribiara a ɛbɛkyere. Adeyɛ yɛ ahyɛde. Ɛsɛ sɛ wɔhohoro ne soro yiye na wɔhyɛ sɛ wɔde nnuru anaa mfiri yɛ profiling. Ɛsɛ sɛ woyɛ etch wɔ soro na ama woayɛ microscopic anchor points ama adhesion.
Wim Tebea no fã bi (Nna 2 kosi Afe 1) – Asiane a Ɛkorɔn Sen Biara
Eyi ne adeyɛ a asiane wom sen biara ma nneɛma a wɔde kata so. Wɔ asram yi mu no, asase ani tebea sesa ntɛmntɛm. Ɛbɛyɛ nea zinc oxide ne zinc hydroxides a ɛbata ho a ɛnyɛ den na ɛkata so. Mpɛn pii no wuhu eyi sɛ nkannare fitaa a ɛte sɛ powder a ɛwɔ dade no so. Saa nneɛma a ɛnyɛ den yi siw paint a ɛbata ho no kwan kɛse. Sɛ wode paint gu wɔn so a, paint no bata powder no ho, na powder no twe fi dade no ho. Adeyɛ hwehwɛ sɛ wɔyɛ ahotew denneennen na wɔyɛ wɔn ho mfonini. Ɛsɛ sɛ wuyi saa chlky deposits yi fi hɔ koraa ansa na wode primer biara ahyɛ mu.
Wim tebea asɛe koraa (Afe 1+) .
Bere a wɔde dade no ahyɛ mu afe biako akyi no, ɛgyina pintinn. Tebea a ɛwɔ soro no sesa bere a ɛtwetwe carbon dioxide fi mframa mu no. Ɛma ɛyɛ zinc carbonate. Eyi yɛ aduru a ɛbata ho denneennen a nsu ntumi nkɔ mu. Zinc carbonate yɛ ade a eye kyɛn so, a efi awosu mu a ɛyɛ mmerɛw a wɔde yɛ paint. Adeyɛ a wɔbɛyɛ wɔ ha no hwehwɛ sɛ wɔyɛ ahwɛyiye. Nea ehia ara ne sɛ wode nsu a ɛyɛ hyew ne ade a wɔde yi srade brɛoo bɛhohoro ho brɛoo. Ɛho hia sɛ wonyi zinc carbonate a ɛwɔ mu no mfi hɔ bere a woresiesie hɔ no.
Wim Tebea Ho Nsɛm Stage |
Bere a Wɔde Yɛ Adwuma |
Tebea a Ɛwɔ Asase no So |
Adeyɛ a Wɔhwehwɛ |
Galvanized a Wɔayɛ no Foforo |
0 kosi 48 Nnɔnhwerew |
Ɛyɛ torotoro, ɛhyerɛn, ɛnyɛ nea ɛwɔ abon |
Hohoro ho yiye; fa nnuru anaa mfiri a wɔde kyerɛw nsɛm gu so. |
Wim tebea no fã bi asɛe |
Nnafua 2 kosi Afe 1 |
Nnuadewa fitaa a ɛte sɛ powder (zinc oxides/hydroxides) . |
Aggressively yi loose compounds ne profile nyinaa. |
Wim Tebea a Ɛyɛ Fɛ Koraa |
1 Afe + |
Zinc carbonate a ɛyɛ den a ɛyɛ den |
Degreasing a ɛnyɛ den nkutoo; kora zinc carbonate no so. |
Ahosiesie a Wɔyɛ wɔ Asase no So: Asiane a Ɛwɔ huammɔdi a Wɔbrɛ ase
Sɛ wuhu wim tebea no pɛpɛɛpɛ mpo a, sɛ wokum no yiye bere a woresiesie wo ho a, ɛbɛsɛe duplex nhyehyɛe no. Ɛsɛ sɛ wudi nhyehyɛe a emu yɛ den akyi na ama asiane ahorow a ɛwɔ huammɔdi mu no so atew.
Asiane a Wɔtew So (Chromate Sɔhwɛ) .
Mpɛn pii no, mmeae ahorow no de dade a wɔayɛ no foforo gu chromate aguaree mu. Saa pasivation agents yi siw wet storage stain bere a wɔde rekɔ no. Nanso, chromates de nsiyɛ pam paint. Ɛsɛ sɛ wode ASTM B201 protocol no sɔ pasivation agents hwɛ bere nyinaa. Sɛ sɔhwɛ no da chromates adi a, wuntumi mfa paint nhyɛ dade no so ntɛm ara. Ɛsɛ sɛ chromates no fi awosu mu wim tebea kɔ, anaasɛ ɛsɛ sɛ wode ahoɔhare yi fi hɔ denam mfiri a wɔde yɛ profiling so.
Ahotew ho Nhyehyɛe ahorow
Ansa na wobɛyɛ nea ɛyɛ mmerɛw no, ɛsɛ sɛ wuyi efĩ, ngo, ne nneɛma a ɛde efĩ ba a nkwa wom nyinaa fi hɔ. Di anammɔn a ɛtoatoa so yi akyi na ama woanya ahotew a eye sen biara:
Fa aduru a wɔde tew nneɛma ho a alkaline anaa acid wom (a wɔtaa yɛ 25:1) gu so.
Fa brɔs a ɛyɛ mmerɛw a ɛwɔ bristle no kanyan efĩ a ɛyɛ den a ɛwɔ abɔde mu.
Fa nsu a ɛho tew na ɛho tew hohoro so yiye na ama nneɛma a wɔde tew ho no ayɛ nea ɛho nhia.
Ma dade no nwo koraa ansa na woakɔ profiling stage no so.
Wɔ nkratafa foforo a ɛho ntew ho no, mfiridwuma mu vinegar fitaa a wɔde popa fam betumi ama wɔanya acid etch a etu mpɔn kɛse, a ɛnyɛ den bere a bere koro no ara woyi ngo a emu yɛ hare fi hɔ no.
Profiling (Anchor Nhwɛso a Wɔyɛ) .
Paint hia bon ne mmepɔw a ɛyɛ nketenkete a ɛbɛtumi akɔ mu. Yɛfrɛ eyi sɛ ankora nhyehyɛe. Wowɔ akwan kakraa bi a wobɛfa so ayɛ eyi a worensɛe dade no.
Sweep Blasting (SSPC-SP 16): Eyi ne nnwuma gyinapɛn a wɔde yɛ mfiri a wɔde yɛ profiling. Ɛsɛ sɛ wode ɔkwan a wɔfa so bɔ nneɛma a ɛba fam di dwuma. Fa nozzle no kura digrii 30 kosi 60 ntam. Fa abrasive a ɛnyɛ den pii di dwuma. Ɛsɛ sɛ abrasive no dibea wɔ Mohs hardness a ɛyɛ 5 anaa nea ɛba fam (te sɛ walnut shells, corncobs, anaa mineral sands pɔtee bi). Ma nneɛma nketenkete no kɛse nyɛ microns 200 kosi 500.
Asiane a Ɛwɔ sɛ Wobɛpae Aboro So: Ɛsɛ sɛ wokwati sɛ wobɛbɔ anhwea a ɛyɛ digrii 90 a wɔtaa de di dwuma ɔkwan biara so. Standard blasting bɛma zinc a ɛyɛ mmerɛw no afi hɔ koraa. Eyi sɛe afɔrebɔ anode ahobammɔ no, na ɛma galvanizing nhyehyɛe no nyinaa yɛ nea mfaso nni so. Sɛ sweep blasting te nka sɛ asiane wom dodo ma wo field crew a, default to chemical methods.
Wash Primers / Acrylic Pretreatment: Eyinom yɛ acidic formulations a wɔayɛ sɛ wɔde nnuru bɛsesa zinc ani tension. Wɔhyɛ zinc no ma egye paint a enhia sɛ wɔde mfiri biara twitwiw. Eyi yi asiane a ɛwɔ hɔ sɛ wɔbɛtow nneɛma a ɛboro so no fi hɔ koraa.
Coating Selection: Nnuruyɛ a Ɛbata Ho Ankasa
Ebia w’ahosiesie no bɛyɛ nea mfomso biara nni ho, nanso sɛ wode nnuru a ɛnteɛ di dwuma a, ɛbɛda so ara ama woadi nkogu kɛse. Zinc yɛ dade a ɛyɛ alkaline, na ɛne paint ahorow bi yɛ adwuma denneennen.
Kardinal Mmara (Nea Ɛsɛ sɛ Wɔkwati) .
Ɛsɛ sɛ wobara paint a wɔde alkyd ayɛ ne primer a wɔde ngo ayɛ a wɔtaa de di dwuma no denneennen. Sɛ zinc hyia alkyd resins a, nnuru bi a wontumi nhyɛ so ba. Wonim eyi sɛ saponification. Zinc a ɛyɛ alkaline no ne ngo ahorow no yɛ adwuma ma ɛyɛ samina ankasa wɔ paint film no ase. Sɛ wɔde saponification ba wie a, ade a wɔde kata so no bɛpae wɔ nkratafa akɛse a ɛyɛ mmerɛw mu. Eyi ma wonya awerɛhyem sɛ nea wɔde kata so koraa no bedi huammɔ.
Primer Systems a Wɔapene So
Ɛsɛ sɛ wokyerɛ primer ahorow a wɔayɛ no pefee sɛnea ɛbɛyɛ a ɛne zinc bedi nkitaho. Nnwumakuw no gye akuw atitiriw abien tom.
Specialized Self-Etching Primers: Wɔayɛ eyinom titiriw ama hot-dip galvanized surfaces. Wɔne specifications te sɛ SSPC Paint 27. Wɔkeka dade no mu nnuru.
Acrylic Metal Primers: Acrylic primers a ɛwɔ nsu mu a ɛyɛ papa da sɛ ɛbata zinc a wɔatew ho yiye so yiye. Wɔkɔ so yɛ nea ɛyɛ mmerɛw na wɔko tia saponification koraa.
Topcoats a Ɛyɛ Adwuma Kɛse
Sɛ woyɛ prime wɔ soro wie a, wuhia topcoat a ɛyɛ den na ama woatumi agyina nneɛma a atwa yɛn ho ahyia a wɔde di dwuma ɔkwammɔne so no ano. Yɛkamfo Direct-To-Metal (DTM) acrylic latex paint anaa DTM acrylic enamels kyerɛ sɛ wɔmfa nyɛ abɔnten so adansi adwuma dodow no ara.
Wɔ aggressive environments ho no, ɛsɛ sɛ wo upgrade wo specifications. Susuw nsu mu mmeae a chlorine pii wom ho hwɛ. Polyester powder coats a wɔtaa de di dwuma no di nkogu ntɛmntɛm bere a wɔde hyɛ dan mu ɔtare mu nsu a ɛyɛ hyew mu no. Wɔ saa tebea horow yi mu no, kyerɛ mfiridwuma mu-grade mfonini ahorow a wɔde anammɔn biako yɛ. Saa mfiridwuma mu mfonini titiriw yi twa hia a ehia sɛ wɔyɛ etching primer ahorow a ɛsono emu biara no ho ban efisɛ wɔde nnuru bata zinc a ɛwɔ so no ho tẽẽ.
Coating Ɔfã a Wɔde Kata So |
Nhwɛsode / Nneɛma ahorow |
Atemmu a wɔde mae wɔ Duplex Systems ho |
Nnuru a Wɔabara |
Alkyd enamels, mfitiase ngo a wɔde yɛ ade a wɔahyɛ da ayɛ |
Kwati Katee. Ɛma saponification (samina a ɛba) ne peeling koraa. |
Primers a Wɔapene So |
SSPC Paint 27, acrylic dade a wɔde hyɛ nneɛma ase, nneɛma a wɔde hohoro nneɛma |
Wɔkamfo kyerɛ kɛse. Ɛma nnuru a ɛbata ho a ɛyɛ den a ɛnyɛ adwuma wɔ ɔkwan a enye so. |
Topcoats a Ɛyɛ Fɛ |
DTM acrylic latex, DTM enamels, mfiridwuma mu anammɔn biako zinc paints |
Wɔkamfo kyerɛ kɛse. Ɛyɛ akwanside a ɛyɛ den, ɛyɛ mmerɛw, na ɛko tia wim tebea. |
Akyinnyegye a Ɛko Tia: Bere a Ɛsɛ sɛ Wohuruw Galvanizing + Paint
Ɛsɛ sɛ yɛdi nokwasɛm a ɛho hia a wɔde bedi dwuma ho dwuma. Hot-dip galvanizing a mfoniniyɛ di akyi no yɛ adeyɛ a ɛyɛ den a ɛyɛ nwonwa, a wodi gua pii. Ɛkura mfomsoɔ a ɛkɔ soro ma ɛyɛ nwonwa. Ɛtɔ da bi a, duplex nhyehyɛe yɛ nea ɛnteɛ a wobɛpaw ama wo adwuma no.
Nokwasɛm a Wɔde Di Dwuma & Nneɛma a Ɛyɛ Paara
Fabrication ntaa nkɔ pɛpɛɛpɛ. Nsakrae a wɔyɛ wɔ afuw mu no hwehwɛ sɛ wɔyɛ welding wɔ beae hɔ. Welding sɛe HDG layer no ntɛm ara. Sɛ adwumayɛfo a wɔyɛ adwuma wɔ hɔ no de zinc a wɔde petepete so a ɛyɛ nwini siesie weld ahorow yi wɔ afuw mu a, nsiesie no sua koraa sen factory hot-dip galvanizing. Wobɔ nhama a ɛyɛ mmerɛw wɔ wo nkɔnsɔnkɔnsɔn a ɛko tia nsɛe no mu.
Asiane a Ɛwɔ Ɔhyew a Wɔkyinkyim no
Ɛsɛ sɛ wususuw ɔhyew a emu yɛ den a ɛwɔ galvanizing bath no mu nso ho. Dade a wɔde ayɛ adan a ɛyɛ den anaasɛ ɛyɛ pɛpɛɛpɛ yiye no yɛ soronko sɛ ɛyɛ mmerɛw sɛ ɛbɛbɔ na akyinkyim bere a wɔde rekɔ nsu mu no. Sɛ wo adansi nhyehyɛe hwehwɛ sɛ wotumi gyina ano pɛpɛɛpɛ a, ɛsɛ sɛ wohwɛ ASTM A384 akwankyerɛ ahorow a ɛfa ɔhyew a ɛkyinkyim ho. Mpɛn pii no, ɔhyew ho asiane no yɛ kɛse dodo ara kwa.
Primer Alternative a Ɛyɛ Adwuma Kɛse no
Susuw ahwehwɛde ahorow a ɛfa ahosiesie a ɛwɔ wo soro a etwa to no ho. Ebinom a premium marine-grade anaa industrial topcoats hwehwɛ 'Near-White Blast' profile ma adhesion yiye. Sɛ wopae ade a wɔde galvanized ayɛ so ma ɛne Near-White gyinapɛn hyia a, saa ɔtopae a ano yɛ den no bɛsɛe zinc a ɛwɔ so no koraa. Wobɛbɔ wo sika a wode asie no agu mfutuma mu.
Gyinaesi Nteaseɛ
Wɔ tebea horow a ɛyɛ pɛpɛɛpɛ kɛse mu, anaasɛ wɔ mfiridwuma mu nneɛma a emu yɛ duru a ɛhwehwɛ sɛ wɔyɛ ɔtopae ho mfonini a emu yɛ den mu no, mfaso wɔ so kɛse sɛ wobehuw hot-dip galvanizing koraa. Fa primer a zinc pii wom a ɛyɛ fɛ gu dade a ɛda hɔ kwa a wɔabɔ no yiye so tẽẽ. Fa wo topcoat a ɛyɛ adwuma yiye di eyi akyi. Wobɛnya nkwa tenten a wɔde toto ho, ayi asiane a ɛwɔ hɔ sɛ ɔhyew bɛkyinkyim no afi hɔ, na woama wo nneɛma a wode ma no ayɛ mmerɛw kɛse.
Awie
Zinc a wɔde yɛ mfonini no tu mpɔn kɛse, nanso ne titiriw no, ɔkwan a wɔfa so yɛ no ntumi nnye akwan ntiantiaa ano. Wo nkonimdi no gyina wim tebea ho nhwehwɛmu a edi mu a wobɛyɛ, ɔkwan a wɔfa so yɛ profiling a ɛyɛ pɛpɛɛpɛ, na woakwati resins a ɛne ne ho nhyia te sɛ alkyds koraa so.
Ansa na wubefi wo adwuma a edi hɔ no ase no, yɛ ho biribi de bɔ wo specification no ho ban. Tu wo adetɔ ne mfiridwuma akuw fo sɛ wɔmfa nsiyɛ nhwɛ wɔn a wɔde nneɛma ma no adwumayɛ mu. Hwɛ sɛ wɔbɛhwɛ sɛ wɔdi ASTM D6386 a wɔde siesie asase ani ne SSPC-SP 16 a wɔde yɛ sweep blasting no so koraa. Ɛdenam gyinapɛn ahorow yi a wɔhwehwɛ sɛ wodi so so no, wodan mfoniniyɛ a asiane wom ma ɛbɛyɛ duplex nhyehyɛe a wotumi hyɛ ho nkɔm, a ɛtra hɔ kyɛ yiye.
FAQ
Asɛmmisa: So wubetumi ayɛ adwini tẽẽ wɔ dade a wɔde galvanized ayɛ so?
A: Dabi, nneɛma a wɔansiesie, a wɔde galvanized ayɛ no foforo no yɛ torotoro dodo na nnuru yɛ adwuma ma paint a wɔde bata ho daa. Ɛsɛ sɛ wohohoro dade no ho yiye, wode nnuru a wɔde yɛ etch anaasɛ low-pressure sweep blast di dwuma de yɛ profile, na wudi kan de dade a wɔde hyɛ mu titiriw gu so.
Asɛmmisa: Paint bɛn na ɛbɛbata dade a wɔde galvanized ayɛ ho?
A: Ɛsɛ sɛ wode Direct-To-Metal (DTM) acrylic latex paint, acrylic enamels, anaa mfiridwuma mu paint titiriw a wɔde anammɔn biako ayɛ a wɔayɛ ama zinc di dwuma. Ɛnsɛ sɛ wode alkyd anaa aduru a wɔde ngo ayɛ di dwuma da, efisɛ ɛbɛma ayɛ sapon na akyinnye biara nni ho sɛ ɛbɛpete.
Asɛmmisa: Ɔkwan bɛn so na meyɛ dade a wɔde galvanized ayɛ a ayɛ mmerɛw (a wim tebea ayɛ) ho adwini?
A: Sɛ wuhu 'white rust' (zinc oxide) a, ɛsɛ sɛ wuyi fi hɔ yiye denam ahotew a ano yɛ den ne degreasing so. Sɛ wuhu sɛ nkannare kɔkɔɔ a, dade a ɛwɔ ase no da adi. Ɛsɛ sɛ woyɛ atetesɛm mu nneɛma a wɔde siesie nkannare na wode patch primer a zinc pii wom gu so ansa na wode akata so koraa.
Asɛmmisa: So mihia primer titiriw bi ma galvanized dade coil?
A: Yiw. Mpɛn pii no, wɔde pasivation ayaresa te sɛ chromates anaa rolling oils a wɔde gu adwumayɛbea hɔ di dwuma wɔ coils mu. Ɛsɛ sɛ wudi kan de nnuru yi nneɛma a ɛbɔ wo ho ban yi fi hɔ. Ɛno akyi no, ɛsɛ sɛ wode dade a wɔde hyɛ wo ho anaasɛ acrylic-based dade primer gu so ansa na wode wo topcoat a etwa to no ahyɛ wo ho.
