Zinc wrought alloy with improved coatability

Abstract

The present invention relates to a zinc wrought alloy with improved coating properties as compared to known wrought alloys, and to the use thereof for preparing semifinished products, forgings, turned parts, locks, screw connections, locking cylinders, sleeves, fittings, pressed parts, pneumatic parts, hydraulic parts, mountings, valves and ball valves.

1 . A method of making an article, the method comprising including in the article a zinc wrought alloy having an Al content of from 5% by weight to 12% by weight, a Cu content of from 0.1% by weight to 4% by weight, an Mg content of from 0.001% by weight to 0.05% by weight, wherein Zn is the balance to 100%, the article being one or more of preparing forgings, turned parts, locks, screw connections, locking cylinders, sleeves, fittings, pressed parts, pneumatic parts, hydraulic parts, mountings, valves and/or ball valves. 
     
     
         2 . The method according to  claim 1 , characterized in that lead is not included in the alloy. 
     
     
         3 . The method according to  claim 1 , characterized in that the content of Al is from 5% to 12% by weight. 
     
     
         4 . The method according to  claim 1 , characterized in that the content of copper in the alloy is from 0.1% to 2.5% by weight. 
     
     
         5 . The method according to  claim 1 , characterized in that the content of magnesium in the alloy is from 0.003% by weight to 0.05% by weight. 
     
     
         6 . The method according to  claim 1 , characterized in that the alloy further contains silicon. 
     
     
         7 . The method according to  claim 1 , wherein said alloy has the following composition: Al content of from 5% to 8% by weight, Cu content of from 0.5% to 1.5% by weight, Mg content of from 0.003% to 0.05% by weight, with zinc as the balance to reach 100% by weight. 
     
     
         8 . The method according to  claim 1 , wherein said alloy has the following composition: Al content of from 9% to 12% by weight, a Cu content of from 0.5% to 1.5% by weight, an Mg content of from 0.003% to 0.05% by weight, with zinc as the balance to reach 100% by weight. 
     
     
         9 . The method according to  claim 1 , wherein said alloy has a Ti content of up to 1% by weight. 
     
     
         10 . A manufactured object that comprises a zinc wrought alloy as described in  claim 1 , the object being a semifinished product or an article, wherein the object passes a salt spray test according to DIN EN ISO 9227:2012, wherein the test requirements are considered to be met if no corrosion in the form of white rust occurs on the surface after 96 hours. 
     
     
         11 . A manufactured object that comprises a Use of a zinc wrought alloy as described in  claim 1 , the object being a semifinished product or article, wherein the articles pass a condensation water test according to DIN EN ISO 6270-2:2016, wherein the test requirements are considered to be met if no blistering or corrosion occurs on a surface of the object after 96 hours in a condensation water chamber.