I-Galvalume Coil epeyintwe kwangaphambili, ekwabizwa ngokuba yiPpgl Coil okanye iPpgl Steel Coil, sisixhobo esibalulekileyo sokwakha iindonga zamakhethini, izindlu zezixhobo, kunye nokuthuthwa kweetyathanga ezibandayo. Ukumelana kwayo nokugqwala kuchaphazela ubomi benkonzo yemveliso, iindleko zokugcinwa kwayo, kunye nokhuseleko. Kwiimeko ezinzima ezifana neendawo zaselwandle kunye neendawo zongcoliseko lwemizi-mveliso, ukufumana iindlela zokunyusa ukumelana nokugqwala kwePpgl Steel yingxaki enkulu kushishino. Eli nqaku linika amaqhinga amahlanu aluncedo asekelwe ekusetyenzisweni kwehlabathi lokwenyani.
I. Yenza i-Substrate ibe ngcono: Isiqalo Esihle Sokumelana Nokugqwala
Ukumelana nokugqwala kwePpgl Steel kuxhomekeke kwisiseko sayo, isiseko esifakwe i-zinc efakwe i-aluminium (iGalvalume Coil).
1. Lawula Ukwaleka: I-Ppgl Steel Coil elungileyo idinga umxube ochanekileyo we-aluminium (55%), i-zinc (43.4%), kunye ne-silicon (1.6%). I-Silicon inceda ekwenzeni umaleko we-alloy kwaye iyeke umaleko we-zinc ukuba ungaxobuli. Ukwaleka kwe-zinc eyenziwe nge-aluminiyamu kufuneka kube yi-120 g/m² ubuncinane (macala omabini). Kwiindawo ezigudle ulwandle ezirhabaxa kakhulu, kunokuba ngaphezulu kwe-150 g/m² ukwenza umaleko okhuselayo onamandla.
2. Khetha i-Substrate ecocekileyo: I-substrate yentsimbi yePpgl kufuneka ibe namanqanaba aphantsi okungcola okufana nekhabhoni nesalfure. Oku kunciphisa iziphene ezincinci kwaye kuthintele ukubola ukuba kuqale. Kungcono ukusebenzisa i-substrates ezine-aluminium zinc ezihambelana nemigangatho ye-ASTM A792 ukunciphisa umngcipheko wokubola.
II. Lungisa Umphezulu Wendawo Ngaphambi Kokuwulungisa: Phucula Ukunamathela Kokugquma
Ukunamathela kwe-Prepainted Galvalume Steel Coil kuchaphazela ukumelana kwayo nokugqwala. Unyango lwangaphambi komphezulu lubaluleke kakhulu:
1. Coca ngamanyathelo amathathu: I-substrate kufuneka idlule ekuhlanjweni kwe-alkaline ukuze kususwe ioyile, ukuhlanjwa kwe-asidi ukuze kususwe umhlwa, kunye nokuhlanjwa ukuze kuncitshiswe. Oku kuqinisekisa ukuba umphezulu ucocekile kwaye kuthintele "ukubola kwe-intercalation" phakathi kwengubo kunye ne-substrate.
2. Ukuphucula i-Passivation: Sebenzisa i-chromate passivation okanye i-chromium – free passivation (engcono kwindalo esingqongileyo). Oku kwenza ifilimu ye-passivation efanayo kwi-substrate ye-Galvalume Steel Coil. Inceda i-coating inamathele ngcono kwaye ivale izinto ezirhabaxa.
3. Yomisa kakuhle: Emva konyango lwangaphambi kokucoca, yomisa i-substrate ngokukhawuleza. Gcina umswakama womphezulu ungaphantsi kwe-0.1% ukuthintela ukugqwala kwemingxuma.

III. Khetha Uphahla Olufanelekileyo: Yakha Ukhuseleko Olunezingqimba Ezininzi
Ukwaleka yeyona nto iphambili ekukhuseleni iCoil Ppgl. Xa ukhetha inkqubo yokugquma, cinga ngokumelana nemozulu, ukumelana neekhemikhali, kunye nokunamathela:
1. Khetha iPrimer: Iiprimer ze-Epoxy zilungile kuba zinamathela kakuhle kwaye zivala izinto ezirhabaxa. Kwiimeko ezifunekayo kakhulu, sebenzisa iiprimer ze-polyurethane ukwenza i-coating ibe bhetyebhetye kwaye imelane ne-salt spray.
2. Khetha iTopcoat: Khetha iipeyinti ezimelana nemozulu.
– Kwiindawo eziqhelekileyo: Ii-topcoats ze-polyester ezimelana nemozulu ephezulu zilungile. Zimelana ne-UV kwaye ziguga kakuhle kwaye azibizi kakhulu.
– Kwiindawo ezinzima (ezifana neendawo zaselwandle okanye zemizi-mveliso): Ii-topcoat ze-PVDF (polyvinylidene fluoride) zezona zilungileyo. Ziyakwazi ukumelana nemozulu kunye neekhemikhali kwaye zihlala iminyaka engaphezu kwama-20.
3. Lawula Ubukhulu Bokugquma: I-primer kufuneka ibe bubukhulu obuyi-5 - 7μm, i-topcoat ibe yi-15 - 20μm. Ubukhulu obupheleleyo bokugquma kufuneka bube buncinci yi-25μm ukuze kuthintelwe iingxaki ezifana nemingxuma ye-pinholes.
IV. Landela Imveliso Elungileyo kunye Nokufakwa: Kuphephe Ukugqwala Okubangelwa Ziimpazamo
Nekhoyili yeGalvalume epeyintwe kwangaphambili esemgangathweni ophezulu inokulahlekelwa kukumelana kwayo nokugqwala ukuba icutshungulwa ngokuchanekileyo:
1. Lawula Inkqubo Yokugquma: Sebenzisa i-roller coating ukuze wenze i-coating ilingane. Gcina ubushushu bokugquma bukwi-230 - 250℃ imizuzwana engama-30 - 60. Oku kuthintela i-coating ukuba ingabi buthathaka kakhulu.
2. Khusela Ngethuba Lokufaka:
– Musa ukukrwela umphezulu we-PPGL Coil. Lungisa imikrwelo ngepeyinti yokulungisa ekhethekileyo ngoko nangoko.
– Shiya iindawo zokwandisa xa uzifaka ukuze uthintele ukuqhekeka kombala ngenxa yotshintsho lobushushu.
– Kwiindawo ezikunxweme okanye ezifumileyo, sebenzisa izikhonkwane zentsimbi engagqwaliyo ukuze uphephe ukugqwala okuvela kwiintsimbi ezahlukeneyo ezichukunyiswayo.
V. Gcina rhoqo: Yenza i-Coil ihlale ixesha elide
Ukugcinwa rhoqo kunokunciphisa isantya sokugqwala, ingakumbi kwiGalvalume Steel Coil yangaphandle:
1. Coca Rhoqo: Coca i-coil ngamanzi okanye isepha engathathi cala ubuncinane kanye ukuya kwezimbini ngonyaka. Oku kususa uthuli, ityuwa, kunye nolunye uthuli olunokubangela ukugqwala.
2. Lungisa Umonakalo Ngokukhawuleza: Ukuba kukho imikrwelo okanye umonakalo kwingubo, sebenzisa ipeyinti yokulungisa efanayo ngoko nangoko ukuze uthintele izinto ezirhabaxa ukuba zingafiki kwi-substrate.
3. Zihlukanise neNdalo: Kwiikhoyili ezikufutshane nemithombo ye-asidi okanye ye-alkali okanye ecaleni kolwandle, sebenzisa izithintelo zokukhusela okanye iingubo zokunciphisa ukudibana nezinto ezirhabaxa.