US2004034109A1PendingUtilityA1

Treatment for improved magnesium surface corrosion-resistance

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Assignee: ALGAT SHERUTEY GIMUR TEUFATI KPriority: Jun 28, 2001Filed: Aug 15, 2003Published: Feb 19, 2004
Est. expiryJun 28, 2021(expired)· nominal 20-yr term from priority
Inventors:Ilya Ostrovsky
C23C 22/57C25D 9/00C23C 18/36C25D 11/026C23C 2222/20C25D 11/30Y10T428/31663
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Claims

Abstract

A method, a composition and a method for making the composition for increasing the corrosion resistance of a magnesium or magnesium alloy surface is disclosed. The composition is a water/organic solution of one or more hydrolyzed silanes. By binding silane moieties to the magnesium surface, an anti-corrosion coating on a magnesium workpiece is produced. A complementary method, composition and method for preparing the composition for treating a metal surface to increase corrosion resistance is disclosed. The composition is an aqueous hydrogen fluoride solution with a non-ionic surfactant.

Claims

exact text as granted — not AI-modified
1 . A composition useful for treating of a metal or metal alloy surface comprising: 
 a. hydrogen fluoride (HF);    b. a nonionic surfactant; and    c. water.    
     
     
         2 . The composition of  claim 1  having a HF content of between about 5% and about 40%, by weight.  
     
     
         3 . The composition of  claim 2  having a HF content of between about 10% and about 30%, by weight.  
     
     
         4 . The composition of  claim 3  having a nonionic surfactant content of between about 20 ppm and about 1000 ppm.  
     
     
         5 . The composition of  claim 4  having a nonionic surfactant content of between about 40 ppm and about 500 ppm.  
     
     
         6 . The composition of  claim 5  having a nonionic surfactant content of between about 100 ppm and about 400 ppm.  
     
     
         7 . The composition of  claim 1  wherein said nonionic surfactant is a polyoxyalkylene ether.  
     
     
         8 . The composition of  claim 7  wherein said polyoxyalkylene ether is a polyoxyethylene ether.  
     
     
         9 . The composition of  claim 8  wherein said surfactant is chosen from a group consisting of polyoxyethylene oleyl ethers, polyoxyethylene cetyl ethers, polyoxyethylene stearyl ethers, polyoxyethylene dodecyl ethers.  
     
     
         10 . The composition of  claim 9  wherein said surfactant is polyoxyethylene(10) oleyl ether.  
     
     
         11 . A method of treating a workpiece comprising: 
 a. providing a surface of the workpiece, said surface chosen from the group consisting of magnesium and magnesium alloy; and    b. contacting said surface with a treatment solution, said treatment solution including hydrogen fluoride (HF) and a nonionic surfactant in an aqueous solution.    
     
     
         12 . The method of  claim 11  wherein an HF content of said treatment solution is between about 5% and about 40%, by weight.  
     
     
         13 . The composition of  claim 12  having a HF content of between about 10% and about 30%, by weight.  
     
     
         14 . The method of  claim 11  wherein a nonionic surfactant content of said treatment solution is between about 20 ppm and about 1000 ppm.  
     
     
         15 . The composition of  claim 14  having a nonionic surfactant content of between about 40 ppm and about 500 ppm.  
     
     
         16 . The composition of  claim 15  having a nonionic surfactant content of between about 100 ppm and about 400 ppm.  
     
     
         17 . The method of  claim 11  wherein said nonionic surfactant is a polyoxyalkylene ether.  
     
     
         18 . The composition of  claim 17  wherein said polyoxyalkylene ether is a polyoxyethylene ether.  
     
     
         19 . The composition of  claim 18  wherein said surfactant is chosen from a group consisting of polyoxyethylene oleyl ethers, polyoxyethylene cetyl ethers, polyoxyethylene stearyl ethers, polyoxyethylene dodecyl ethers.  
     
     
         20 . The composition of  claim 19  wherein said surfactant is polyoxyethylene(10) oleyl ether.  
     
     
         21 . The method of  claim 11  wherein said surface is a corroded surface.  
     
     
         22 . A method for the preparation of a treatment solution useful for the treating of a magnesium or magnesium alloy surface comprising combining hydrogen fluoride (HF) and a nonionic surfactant with water.  
     
     
         23 . The method of  claim 22  wherein an amount of HF is combined so that the treatment solution has an HF content of between about 5% and about 40%, by weight.  
     
     
         24 . The method of  claim 22  wherein an amount of nonionic surfactant is combined so that the treatment solution has a nonionic surfactant content of between about 20 ppm and about 1000 ppm.  
     
     
         25 . The method of  claim 22  wherein said nonionic surfactant is a polyoxyalkylene ether.

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