Back to results
US 5,308,710 AGranted
Al-Zn-Si base alloy coated product
AssigneesDaido Steel Sheet Corporation, S-Tem Ltd.
InventorsMasanori Takeda, Youichiro Suzuki, Kunio Hayakawa
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneesDaido Steel Sheet Corporation, S-Tem Ltd.
InventorsMasanori Takeda, Youichiro Suzuki, Kunio Hayakawa
Estimating the term…
An Al-Zn-Si base alloy coat including an Al-Zn-Si-Fe alloy layer which has remarkable high corrosion resistance is formed on an article. A ferrous base material is used as the article to provide Fe to the alloy layer. The alloy layer of the present invention consists of 55 to 65 wt % of Al, 25 to 35 wt % of Zn, 5 to 10 wt % of Fe, and 2 to 4 wt % of Si, and also has a cross sectional area of 15 to 90% of the entire cross sectional area of the alloy coat. A process for forming the alloy coat of the present invention comprises the step of dipping the article into a molten bath of Zn to form, on the article, an undercoat which results from a reaction between Fe of the article and Zn in the molten bath, and then dipping the undercoat into an alloy molten bath of Al, Zn and Si to form the alloy coat of the present invention on the undercoat.
A corrosion resistant article comprising a ferrous base and an alloy covering the surface of the ferrous base, wherein the alloy comprises an interface layer disposed on the ferrous base and an intermediate layer disposed on the interface layer, and an outer layer disposed on the intermediate layer, the interface layer consists essentially of Fe, Zn, and at least one member of the group consisting of Al, Si, Mg, Ti, In, Tl, Sb, Nb, Co, Bi, Mn, Na, Ca, Ba, and Ni, the intermediate layer consists essentially of 55-65 wt % Al, 5-10 wt % Fe, 2-4 wt % Si, and 25-35 wt % Zn, and the outer layer consists essentially of Al, Zn, and Si and the intermediate layer has a cross-sectional area of 15 to 90% of the entire cross-sectional area of the alloy.
Dependencies are inferred from the claim text.