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Izimiso Zokuphakamisa Ukugxilwa Kwe-Metalu Ukuze Uthuthukise Ukugxilwa Kwe-Sikrini Sokufaka Ematsheni
Aluminum: Ukuphakamisa Ukugxilwa Kwe-Oxide Layers Futhi Ukuvikela Ukugxilwa Kwe-Sikrini Sokufaka Ematsheni Okuphelele
I-Aluminum liyadala ngokuzenzakalelayo ilayiya yamaphutha, engaqondi kahle yamaphutha okhokho okungavamile, okuyisiphelo sokubambisana kwe-powder. Ukuphatha kokuqala okuhle kufanele kubhekise izinkinga zezinto zokudlula nezinkinga zokungavamile kwe-oxide:
- Susa izihlangu zemithambo ngokusebenzisa izikhuluma zemithambo
- Sebenzisa ukuchitha kwemithambo ekhontrolwayo (isibonelo, i-nitric–fluoric noma i-sulfuric–fluoride blends) ukususa izi-oxide ezingavamile futhi ukwenza isilwane sasemkhathini sifanekile ngokucacile
- Faka ilayiya yokuqhubeka—izinhlelo zezirconium ezingazimisekile ngokuchromate zingaba yisiqu sesikhathi esihle—ukwenza ilayiya eliqinile, eliqinile ngokucacile okuncongolisa umthelela wokusebenza ngokuphakama kwe-30–40 dynes/cm
Lapho konke kusebenza ndawonye kahle, sithola amandla okudonsa kagesi ahambisana kahle nokugeleza kwesiphuzo okubushelelezi phezu kwemiphezulu. Nokho, uma kungekho ukuhlanzwa okufanele kuqala, izinto ziyawohloka ngokushesha ikakhulukazi lapho amazinga omswakama enyuka. Izinga lokwehluleka kokunamathisela ligxuma libe ngaphezu kwamaphesenti angu-60 kulezi zimo. Ukuthola indawo efanele yokumboza kubalulekile kakhulu, kudingeka ihlale ngaphakathi kwaleyo ndawo emincane engamamitha angu-0.5 kuya kwangu-1.5. Uma ungaphesheya kwalezi zinombolo, kokubili ukuxhumana kuyaba buthaka futhi nokuvikelwa kokugqwala kuyawohloka ngokuhamba kwesikhathi. Izindinganiso zomkhakha ziyakweseka lokhu ngokubheka i-AMA 2604 ngokwesibonelo. Ngokwezici zabo, i-aluminium eye yacutshungulwa kahle igcina ukunamathela okungaphezu kuka-95% ngisho nangemva kokuhlolwa ngosawoti amahora angu-2 000 okuyinto eyenzeka eduze kwezindawo ezisogwini noma izindawo zezimboni.
Insimbi Enama-galvanized: Ukulawula Ukuphendula Kwe-Zinc Nokugqwala Ukuze Ube Nokunamathela Okuqinile
Izilwane zezinkolo zezinc zikhoza izinkinga ezihlukene ngokwakho kwezinkolo zezinc zokuphambana kwezinkolo nezinkolo zokubona izinto zokugqibela ezingavumelani nesikhundla. Ukusebenza okuhle kwezinkolo kufokusiswe kusukela kwezinkolo ngaphandle kokuthinteka kwezinkolo zokuphambana:
- Sebenzisa ukuchitha ngokushesha ukususa izinkolo zokugcina, izinkolo zokuphambana, nezinkolo zokugcina
- Sebenzisa ukuvimbela ngaphandle kwezinkolo zezinc (isb. izinkolo zezinc ezinamathuba amabili noma izinkolo zezinc nezirconium) ukuthinteka kwezinc ngaphandle kokuthinteka kwezinkolo zokuphambana
- Gcina ubukhulu bezinkolo zezinc phakathi kwe-20–40 g/m² (≈20–40 mg/ft²) ukuvumela ukuthi kubhekwe ngokulinganayo nokuthinteka kwezinkolo futhi ukuvikela ukuthi kuzwe ‘spalling’ ngczasana
Amapulangwe angashintshiwe ayokwakha lokho okubizwa ngokuthi ukugqwala okumhlophe, okuyisisekelo se-zinc hydroxide carbonate, ezinsukwini ezimbili nje lapho esesimweni esivamile. Lokhu kuholela ezinkingeni ezingathi sína njengokwakheka kwamabhamuza nezendlalelo eziqhekeka endaweni engaphansi kokumbozwa ngempuphu. Izindaba ezinhle ukuthi ukwelashwa kokubamba kunganciphisa ukuchitheka kwama-ion e-zinc ngamaphesenti angaba ngu-85 ngokusho kokuhlolwa okulandela izindinganiso ze-ASTM B117. Ukuze uthole imiphumela emihle, abakhiqizi kufanele bahlanganise ukufakwa kwe-passivation namaphrofayli afanele okuqina. Insimbi eye yacindezelwa kahle ihlangabezana njalo nezidingo ze-AMA 2605 futhi igcina ukunamathela okungaphezu kwamaphesenti angu - 95 ngisho nangemva kokuchayeka ekufafazeni usawoti amahora ayinkulungwane.
Ukukhethwa Kwezinto Ezibonakalayo Nomphumela Wakho Ekubambeni Kwe-Powder Coating
Umbala wokuthi yini imateriali esithi sibhoshela kuyisisekelo sokuthi ipowda kuyasebenza njani. Akukho kuphela ukuthi izinkemikhali zikuphi emaphakathini, kodwa amathuluzi okugqamisa ayisisekelo futhi, njengoba kusukela umoya kusukela kwezinto, futhi ukuthi imateriali iyasibeka njani ngezinsuku zokugqamisa. Amaphakathi emetalu ayisisekelo ngokuzenzakalelayo ngamaphakathi weoksidi, futhi ayisukela amaphakathi amancane wezinye izinto. Uma sibheka izinto ezingavumi (plastics) noma izinto ezinamaphakathi emafibha, ziyasukela umdla ngokuvamile. Ngokugqamisa, lezi zinto ziyasukela izinkemikhali zokugqamisa noma izinkemikhali ezingaphezulu zokugqamisa. Konke lokhu kubangela izinkinga emva kwalesi siyakwazi. Sizobona izindawo ezingazange zibe nzima phakathi kwezindawo zokubhoshela, futhi izindlela zokugqamisa ziyabhekana nezindawo zokugqamisa. Kufuphi kakhulu, ipowda yonke iyadlula ngokuphelele.
Ngokwesibonelo, cabanga nge-aluminium. Uma ingelashwa, iqala ukwakha leso sikhala esivikelayo se-oxide cishe ngokushesha ngemva kokuchayeka emoyeni. Lokhu kunciphisa indlela izembozo ezinamathela ngayo ebusweni, ngezinye izikhathi kuze kufike ku-40% uma kuqhathaniswa nezindawo ezisanda kushoniswa noma eziye zaphathwa ngamakhemikhali. Lolu hlobo lwenkinga luyenzeka nangezinto zokwenziwa. Lezo zinto ezakhiwe nge-PVC noma i-phthalate zivame ukubonisa izinkinga ngezingubo zazo ezinyangeni ezingaba yisithupha kuya kwezingu-12 ngoba izithasiselo ziya ngqo endaweni yazo. Ngisho nezinhlobo ezahlukene zensimbi ziziphatha ngendlela ehlukile lapho zishiswa. Insimbi enesisindo esincane ishisa ngokushesha okukhulu lapho iqeda ukuqina. Lokhu kungaba yinkinga ngoba i-powder ingaqala ukubola ngaphambi kokuba ifilimu ibe khona kahle. Nokho, insimbi eyisisekelo esindayo isebenza ngendlela ehluke ngokuphelele. Kuthatha isikhathi eside ukuba ukushisa kumuncwe, ngakho abakhiqizi kudingeka bakunike isikhathi esengeziwe kuhhavini ukuze kube nokuxhumana okufanelekile phakathi kwento.
Ukufumana ukubambisana okuhle kusho ukuthi kufanele ubheke amasurfesi wezinto ezihlukanayo kuqala. Sibone izinto ezenza amasurfesi ayo abe nemiphumela yomkhawulo wokusebenza omfana, okungabonakalwa ngokusebenzisa izilimi zomkhawulo noma ukubhabha izinkampani zokugcina. Kunezinto ezingaphansi kwezinye ezinamandla okukhanya, futhi kunezinto ezingaphansi kwezinye ezingenakho izinto ezingakhathalekileyo, nakwezinye ezingenakho ukuthi umthelela wokuphuma kwemithwalo kuyasebenza ngendlela efanele nokuzimisa kwe-powder coating. Izinhlelo zezindustria njenge-ISO 20471 zikhuluma loku, kodwa isibonelo sezinsizakwane sibonisa okunye: okubalulekile kakhulu ngokuphakeme kungumqondo wokukhetha izinto ezihlukanayo kuphela, kodwa kukhona ukwenza ukuphatha kwezinto ezihlukanayo ngokuphelele ngokuphakeme. Lolu gama luyenza umphumela wonke xa izicoco zifuna ukuba zibe phakade ngaphandle kokuphakama noma ukuphakama emva kwezinsuku eziningi.