US2006102484A1PendingUtilityA1

Anodization process for coating of magnesium surfaces

49
Individually held — no corporate assignee on recordPriority: Nov 12, 2004Filed: Nov 12, 2004Published: May 18, 2006
Est. expiryNov 12, 2024(expired)· nominal 20-yr term from priority
Inventors:Earl R. WoolseyWilliam Gorman
C25D 11/30
49
PatentIndex Score
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Claims

Abstract

A composition that includes at least one alkali metal hydroxide, at least one alkali metal silicate, at least one alkali metal fluoride, and hydrogen peroxide. The invention also includes a method of applying an anodic coating on at least a portion of a surface of a magnesium-containing article that includes the steps of electrically connecting the article with a power source, absorbing a composition with an absorbent applicator, which is in contact with a cathode, supplying a voltage from the power source, and contacting the absorbent applicator with the article, wherein the composition comprises at least one alkali metal hydroxide, at least one alkali metal silicate, at least one alkali metal fluoride and hydrogen peroxide.

Claims

exact text as granted — not AI-modified
1 . A composition comprising: 
 at least one alkali metal hydroxide;    at least one alkali metal silicate;    at least one alkali metal fluoride; and    hydrogen peroxide.    
   
   
       2 . The composition according to  claim 1 , wherein said at least one alkali metal hydroxide is sodium hydroxide.  
   
   
       3 . The composition according to  claim 1 , wherein said at least one alkali metal hydroxide has a concentration between about 0.5 M and about 5 M.  
   
   
       4 . The composition according to  claim 1 , wherein said at least one alkali metal hydroxide has a concentration between about 0.75 M and about 3.75 M.  
   
   
       5 . The composition according to  claim 1 , wherein said at least one alkali metal silicate is a sodium silicate compound.  
   
   
       6 . The composition according to  claim 1 , wherein said at least one alkali metal silicate comprises a solution that comprises between about 8 and about 9 wt % NaOH and between about 24 and about 31 wt % SiO 2 .  
   
   
       7 . The composition according to  claim 6 , wherein said composition comprises between about 50 g/L and about 440 g/L of said solution.  
   
   
       8 . The composition according to  claim 1 , wherein said at least one alkali metal fluoride compound is sodium fluoride.  
   
   
       9 . The composition according to  claim 1 , wherein said at least one alkali metal fluoride has a concentration between about 0.01 M and about 0.5 M.  
   
   
       10 . The composition according to  claim 1 , wherein said at least one alkali metal silicate has a concentration between about 0.02 M and about 0.3 M.  
   
   
       11 . The composition according to  claim 1 , wherein said hydrogen peroxide has a concentration between about 0.2 M and about 3 M.  
   
   
       12 . The composition according to  claim 1 , wherein said hydrogen peroxide has a concentration between about 0.2 M and about 2.5 M.  
   
   
       13 . The composition according to  claim 1 , wherein said hydrogen peroxide has a concentration between about 0.2 M and about 0.3 M.  
   
   
       14 . The composition according to  claim 1  comprising 
 sodium hydroxide;    sodium silicate solution, wherein said sodium silicate solution comprises from about 8 to about 9% NaOH and from about 24 to about 31 wt % SiO 2 ;    sodium fluoride; and    a solution comprising hydrogen peroxide.    
   
   
       15 . The composition according to  claim 14  comprising 
 150 g/L sodium hydroxide;    50 g/L sodium silicate solution, wherein said sodium silicate solution comprises from about 8.3 to about 8.9% alkali and from about 24 to about 31% SiO 2 ;    1 g/L sodium fluoride; and    2 g/L of a solution comprising 20 wt % hydrogen peroxide.    
   
   
       16 . A method of applying an anodic coating on at least a portion of a surface of a magnesium-containing article comprising: 
 electrically connecting the article with a power source;    absorbing a composition with an absorbent applicator, which is in contact with a cathode;    supplying a voltage from the power source; and    contacting the absorbent applicator with the article, wherein the composition comprises at least one alkali metal hydroxide, at least one alkali metal silicate, at least one alkali metal fluoride, and hydrogen peroxide.    
   
   
       17 . The method of  claim 16 , wherein the uncoated article is electrically connected to the power source through an anode.  
   
   
       18 . The method of  claim 16 , wherein said step of absorbing the composition with the absorbent applicator is accomplished by dipping the absorbent applicator into a container holding the composition.  
   
   
       19 . The method of  claim 16 , wherein the supplied voltage is less than or equal to about 100 V.  
   
   
       20 . The method of  claim 16 , wherein the supplied voltage is less than or equal to about 50 V.  
   
   
       21 . The method of  claim 16 , further comprising moving the absorbent applicator across the surface of the article to be coated.  
   
   
       22 . The method of  claim 16 , further comprising repeating the steps of absorbing a composition with an absorbent applicator, which is in contact with a cathode and contacting the absorbent applicator with the article.  
   
   
       23 . The method of  claim 16 , wherein the composition comprises sodium hydroxide, sodium silicate, sodium fluoride, and hydrogen peroxide.  
   
   
       24 . The method of  claim 16 , wherein said article further comprises steel.

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