Surface treatment composition and methods for use

Abstract

Embodiments of the present disclosure provide a surface treatment composition and methods for using same. The composition for removing contaminants from a metallic surface, can include 3 wt % to 40 wt % of at least one bifunctional alkaline compound, 0.03 wt % to 10 wt % of at least one oxidizer comprising a metal salt, and water, where all weight percentages are based on the total weight of the composition.

What is claimed is: 
     
         1 . A method of removing contamination from a metallic surface, comprising:
 providing an aqueous solution comprising at least one bifunctional alkaline compound, at least one oxidizer comprising a metal salt and water, wherein the aqueous solution has a pH of about 9 to about 12;   adding additional water to the solution such that a ratio of the solution to the additional water ranges from about 1:50 to about 1:150 to provide a diluted mixture having a pH of 10.4 to 10.9;   applying the diluted mixture to a metallic surface to be treated for contamination removal; and   reacting the diluted mixture with the metallic surface to form a passivated metal oxide layer on the reacted metallic surface.   
     
     
         2 . The method of  claim 1 , further comprising blasting the metallic surface with an abrasive material while depositing the diluted mixture on the metallic surface. 
     
     
         3 . The method of  claim 2 , wherein blasting the metal substrate is done by wet abrasive blasting, wet abrasive vapor blasting, high pressure water blasting, or ultra-high pressure water blasting. 
     
     
         4 . The method of  claim 1 , wherein the passivated metal oxide layer comprises ferrous oxide, ferric oxide, or ferric carbonate. 
     
     
         5 . The method of  claim 1 , further comprising distilling the water prior to use. 
     
     
         6 . The method of  claim 1 , wherein the at least one bifunctional alkaline compound comprises a tertiary amine and a hydroxyl group. 
     
     
         7 . The method of  claim 1 , wherein the hydroxyl group is a primary alcohol. 
     
     
         8 . The method of  claim 1 , wherein the at least one bifunctional alkaline compound comprises dimethylethanolamine (DMEA). 
     
     
         9 . The method of  claim 1 , wherein the metal salt comprises sodium, potassium, or ammonium. 
     
     
         10 . The method of  claim 1 , wherein the metal salt is derived from sodium and at least one sulfuric acid. 
     
     
         11 . The method of  claim 1 , wherein the metal salt is derived from sodium and peroxysulfuric acid. 
     
     
         12 . The method of  claim 1 , wherein the metal salt is sodium persulfate. 
     
     
         13 . The method of  claim 1 , wherein the diluted mixture comprises less than about 100 ppm of chlorine. 
     
     
         14 . The method of  claim 1 , wherein the composition has a pH of about 9 to about 12. 
     
     
         15 . The method of  claim 1 , wherein the diluted mixture comprises 3 wt % to 40 wt % of dimethylaminoethanol and 0.03 1 wt % to 10 wt % of sodium persulfate, wherein all weight percentages are based on the total weight of the composition. 
     
     
         16 . A method of removing contamination from a metallic surface, comprising:
 providing an aqueous solution comprising 3 wt % to 40 wt % of dimethylaminoethanol, 0.03 wt % to 10 wt % of sodium persulfate, and water, wherein the aqueous solution has a pH of about 9 to about 12;   adding additional water to the solution such that a ratio of the solution to the additional water ranges from about 1:50 to about 1:150 to provide a diluted mixture having a pH of 10.4 to 10.9;   applying the diluted mixture to the metallic surface using a pressure-driven motive force; and   reacting the diluted mixture with a metallic surface to form a passivated metal oxide layer on the reacted metallic surface.   
     
     
         17 . The method of  claim 16 , wherein the pressure-driven motive force comprises wet abrasive blasting, wet abrasive vapor blasting, high pressure water blasting, or ultra-high pressure water blasting. 
     
     
         18 . The method of  claim 16 , wherein the passivated metal oxide layer comprises ferrous oxide, ferric oxide, or ferric carbonate. 
     
     
         19 . The method of  claim 16 , wherein the passivated metal oxide layer has no added corrosion inhibitor. 
     
     
         20 . The method of  claim 16 , further comprising distilling the water prior to use.