Kwadalwa ngo 08.18

Ithusi le-Aluminium elihlanganisiwe elinokhuni: Ukhiye Wesayensi Wokuxazulula Izinkinga Zokugqwala Ezindaweni Ezinzima

Ngaphansi kokuhlaselwa okuhlanganisiwe kwe-salt spray yasogwini kanye ne-asidi yemvula yezimboni, izintambo zensimbi ezihlotshisiwe ngokujwayelekile ziyaqhuma futhi zifele phakathi kweminyaka engu-3-5, kanti impilo yokusebenza yezintambo zensimbi ezihlotshiswe nge-zinc-aluminum alloy (Zn-5%Al) ingandiswe ibe yimizuzu engu-8-15. Izinzuzo zayo eziguqulayo ziqhamuka ezimisweni ezintathu eziyisisekelo zobuchwepheshe:

"Dual-Protection" Mechanism

Traditional galvanizing relies solely on the sacrificial anode protection of zinc; once the zinc layer is depleted, the iron substrate corrodes rapidly.

In zinc-aluminum alloy coatings, 5% aluminum forms a dense Al-Zn-Si ternary eutectic phase (microscopically exhibiting a lamellar structure) with zinc, simultaneously achieving:

Physical barrier: Die Al₂O₃-Folie, die durch die Oxidation von Aluminium gebildet wird, blockiert das Eindringen von korrosiven Medien.

Electrochemical protection: Zinc continuously acts as a sacrificial anode, delaying corrosion of the substrate.

Self-Healing Capability

When the coating surface is scratched:

Scratches on traditional galvanized coatings undergo explosive rusting (due to exposed cathodes).

Ku zinc-aluminum coatings, izigaba ezicebile nge-zinc zisheshisa ukufuduka endaweni eonakele, zikhuphuke ukuze zakhe ifilimu yokuvikela entsha, futhi zivale indlela yokugqwala.

Anti-Localized Corrosion Properties

In coastal environments with chloride ion concentrations exceeding 500ppm:

Izi zendlalelo ezihlanganiswe ngensimbi zikhuthaza ukugqwala okujulile (ngokuphuma kokugqwala okungafika ku-0.5mm/ngonyaka).

Ngokwemikhiqizo yokugqwala ye-aluminium, ama-coatings e-zinc-aluminium akha ungqimba oluqinile lokuvikela lwe-basic zinc chloride (Zn₅(OH)₈Cl₂), linciphisa izinga lokuphuka lize libe ngu-0.05mm/ngonyaka (okulinganiswa ngokwe-ASTM G46).

Ukwamukelwa KwezeMisebenzi Zobuchwepheshe:

A seaport guardrail in Fujian: Traditional galvanized steel wires suffered extensive rusting and breakage after 4 years of use; after replacement with zinc-aluminum alloy coated wires, only minor surface spots appeared after 8 years.

40% kuqedlula ekupheleni kwezindleko zokuphila: Ngaphezu kwesikhathi sokusebenza seminyaka engama-20, izindleko zokunakekela eziphelele ze-zinc-aluminum alloy coatings zisezingeni eliphansi kunezokugaya.

Zinc-aluminium legeringcoating verteenwoordig 'n paradigma verskuiwing in korrosiebeheer—infusering van ingenieurswese met "duurzaamheid gene" deur materiaalwetenskap.