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Methods of removing rust from a ferrous metal-containing surface

a ferrous metal and surface technology, applied in the preparation of detergent mixture compositions, inorganic non-surface active detergent compositions, detergent compounding agents, etc., can solve the problems of affecting the appearance and/or suitability for further use, corrosive and caustic chemicals are, however, often undesirable, and the appearance of the surface is altered

Inactive Publication Date: 2012-07-26
PPG IND OHIO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During processing or simply upon exposure to the atmosphere, a metal oxide layer, i.e., rust, is often formed over all or part of a ferrous metal surface, thereby impairing its appearance and / or suitability for further use.
These highly acidic, corrosive and caustic chemicals are, however, often undesirable from an environmental and safety standpoint.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0032]Five solutions were prepared using the ingredients and amounts (in grams) listed in Table 1. Rusted panels were prepared by cleaning 3×4 inch bare cold rolled steel panels (available from ACT Test Panels LLC 273 Industrial Dr. Hillsdale, Mich. 49242) with a commercially available alkaline cleaner (CK2010 commercially available from PPG Industries, Inc.) and then placing the panels in a salt spray chamber for four hours. The panels were rinsed with de-ionized water and allowed to air dry under ambient conditions prior to application of the solutions.

TABLE 1Example Example Example Example Example Ingredient1A1B1C1D1ELaponite RD1 6————Klucel M2—1.5———Klucel H3——1.5——Polyvinyl-———15—pyrrolidone4Gelatin ————15(Calf Skin)5Deionized water114 118.5 118.5 105 105 Citric acid3030  30  30301Laponite RD is commercially available from Southern Clay Products, Inc. In Example 1A, the Laponite RD was incorporated into the water following the manufacturer's recommendations. The citric acid was...

example 2

[0034]Three solutions were prepared using the ingredients and amounts (in grams) listed in Table 3. In each Example, the clay was sifted into the water while stirring. The Laponite RD containing material showed an increase in viscosity after a few minutes after incorporation. Within twenty minutes, the solution became clear with no visible particles. The Bentonite solution showed a very slight change in viscosity after addition to the water and the material remained an opaque, blue-green color. The Kaolin material did not show any change in viscosity after addition. After each clay was added, the solution was stirred for approximately 20 minutes, the citric acid was added and the resulting mixture was stirred for about 10 minutes.

TABLE 3IngredientExample 2AExample 2BExample 2CDeionized Water380380380Laponite RD120——Bentonite2—20—Kaolin2——20Citric acid1001001001Commercially available from Southern Clay Products, Inc.2Commercially available from VWR International, LLC.

[0035]Rusty pane...

example 3

[0037]Three solutions were prepared containing the same theoretical amounts of chloride using the ingredients and amounts (in grams) listed in Table 5. In each case the Laponite RD was incorporated into the water following the manufacturer's recommendations. The citric acid was then slowly added while stirring the solution. For Example 3A, the hydrochloric acid was then added drop wise while stirring. For Example 3B, the sodium chloride was then added while stirring. For Example 3C, the ammonium chloride was then added while stirring.

TABLE 5IngredientExample 3AExample 3BExample 3CDeionized water317.5342.9346.1Laponite RD202020Citric acid10010010037% HCl162.5——NaCl1—37.1—NH4Cl1——33.91Commercially available from VWR International, LLC.

[0038]Rusty panels were prepared as in Example 1. The three solutions were applied to the panels disposed at an angle of approximately 80° from horizontal. After 1 hour, the panels were rinsed with water and the amount of rust removal was visually assess...

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Abstract

Disclosed are methods for removing rust from a ferrous metal-containing surface. These methods include contacting the surface with a composition that includes a carboxylic acid, a synthetic hectorite clay, and water.

Description

FIELD OF THE INVENTION[0001]The present invention relates to, among other things, methods for removing rust from a ferrous metal-containing surface.BACKGROUND OF THE INVENTION[0002]During processing or simply upon exposure to the atmosphere, a metal oxide layer, i.e., rust, is often formed over all or part of a ferrous metal surface, thereby impairing its appearance and / or suitability for further use. One example is steel, such as mild steel used in the manufacture of various articles. Accordingly, it is often desirable to remove the metal oxide layer. Conventionally, this removal has been accomplished by treating the rusted metal surface with a strong acid, such as nitric, sulfuric, hydrochloric, or phosphoric acid. These highly acidic, corrosive and caustic chemicals are, however, often undesirable from an environmental and safety standpoint.[0003]In some cases, the ferrous metal to be treated is oriented in a substantially vertical fashion such as can be the case with, for exampl...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C22C38/00C23G1/02
CPCC11D3/1253C11D7/20C23G1/088C11D11/0029C11D7/265C11D2111/16C23G1/08C11D11/00
Inventor PAWLIK, MICHAEL J.LINGENFELTER, THOR G.SILVERNAIL, NATHAN J.
Owner PPG IND OHIO INC
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