Zincate-treated article of al-mg-si base alloy and method of manufacturing the same
CA 2173696 C · Owner: Maezono, Shunichiro · Inventors: Tawara, Makoto; Toyose, Kikuo; Maezono, Shunichiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
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A zincate-treated article of an Al-Mg-Si base alloy has a zincate coating film having a Zn crystal grain size of 1.0 µm or smaller on an Al-Mg-Si base alloy body having a Cu content of 0.1 to 1.5-weight %. The Zn crystal grain size is preferably equal to or smaller than 0.95 µm. This zincate-treated article can be manufactured by treating an Al-Mg-Si base alloy body having a Cu content of 0.1 to 1.5 weight % in a zincating treatment bath containing 100 to 300 g/l of sodium hydroxide, 5 to 20 g/l of zinc oxide 2 to 10, g/l of iron chloride, 5 to 20 g/l of Rochelle salt and 50 to 200 ml/l of water glass at a temperature of 20 to 80°C for 5 to 60 seconds. By adjusting the Zn crystal grain size …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed April 9, 1996 and granted November 16, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 9, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 9, 2018.
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