MGalloy member and its use

Abstract

A Mg alloy member with an anticorrosive coating free from any environmental load can be produced by using a solution for chemical conversion treatment for anticorrosive coating, which comprises 0.05 to 1 mol/l of an oxoacid compound of heavy metal selected from Mo, W and V and has a pH of 2 to 6 adjusted by sulfuric acid or nitric acid, and is characterized by contacting the surface of Mg alloy preferably containing 2 to 10% Al with the solution, thereby forming a specific oxide film and, if necessary further forming a fluorine-containing organic film on the film, the resulting Mg alloy member being used in electrically driven blowers, note-type personal computers, various household electrical appliances, etc.

What is claimed is  
     
         1 . A solution for chemical conversion treatment for anticorrosive coating, characterized by comprising 0.05 to 1 M of a heavy metal oxo acid compound comprising at least one of heavy metal atoms selected from Mo, W and V in terms of the heavy metal atom and having a pH of 2 to 4 adjusted by sulfuric acid or nitric acid.  
     
     
         2 . A process for producing a Mg alloy member, characterized by contacting a Mg alloy with an aqueous acidic solution containing a heavy metal oxo acid compound of at least one of heavy metals selected from Mo, W and V, thereby forming an oxide film on the surface of the Mg alloy.