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Methods of removing rust from a ferrous metal-containing surface

A technology of iron and composition, applied in chemical instruments and methods, non-surface-active detergent compositions, inorganic non-surface-active detergent compositions, etc., can solve the problems of undesired chemical environment and safety, etc.

Inactive Publication Date: 2013-11-27
PPG IND OHIO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these highly acidic, corrosive and violent chemicals are generally undesirable from an environmental and safety standpoint

Method used

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  • Methods of removing rust from a ferrous metal-containing surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Five solutions were prepared with the ingredients and amounts (in grams) listed in Table 1. The corroded plate was cleaned by using a commercially available alkaline cleaner (CK2010, commercially available from PPG Industries, Inc.) to clean a 3x4 inch bare cold-rolled steel plate (available from ACT Test Panels LLC273 Industrial, Dr. Hillsdale, MI49242), and then Place the plate in the salt spray chamber for 4 hours to prepare. The board was rinsed with deionized water and air dried under ambient conditions, and then the solution was applied.

[0037] Table 1

[0038] Ingredients

Example 1A

Example 1B

Example 1C

Example 1D

Example 1E

Laponite RD 1

6

--

--

--

--

Klucel M 2

--

1.5

--

--

--

Klucel H 3

--

--

1.5

--

--

Polyvinylpyrrolidone 4

--

--

--

15

--

Gelatin (calfskin) 5

--

--

--

--

15

Deionized water

114

118.5

118.5

105

105

Citric acid

30

30

30

30

30

[0039] 1 Laponite RD is commercially available from Southern Clay Products, Inc. In Example 1...

Embodiment 2

[0049] Three solutions were prepared with the ingredients and amounts (in grams) listed in Table 3. In each example, the clay was sprinkled into the water with stirring. The Laponite RD-containing material showed increased viscosity after several minutes of incorporation. Within 20 minutes, the solution became transparent and there were no visible particles. The bentonite solution showed a very slight viscosity change after adding water, and the material remained opaque blue-green. The kaolin material did not show any viscosity change after addition. After the various clays were added, the solution was stirred for about 20 minutes, citric acid was added, and the resulting mixture was stirred for about 10 minutes.

[0050] table 3

[0051] Ingredients

Example 2A

Example 2B

Example 2C

Deionized water

380

380

380

Laponite RD 1

20

--

--

Bentonite 2

--

20

--

Kaolin 2

--

--

20

Citric acid

100

100

100

[0052] 1 It is commercially available from Southern Clay Produ...

Embodiment 3

[0059] Three solutions containing the same theoretical amount of chloride ion were prepared using the ingredients and amounts (in grams) listed in Table 5. In each case, Laponite RD was added to the water according to the manufacturer's recommendations. Then the citric acid was slowly added while stirring the solution. For Example 3A, hydrochloric acid was then added dropwise with stirring. For Example 3B, sodium chloride was then added with stirring. For Example 3C, ammonium chloride was then added with stirring.

[0060] table 5

[0061] Ingredients

Example 3A

Example 3B

Example 3C

Deionized water

317.5

342.9

346.1

Laponite RD

20

20

20

Citric acid

100

100

100

37%HCl 1

62.5

--

--

NaCl 1

--

37.1

--

NH 4 Cl 1

--

--

33.9

[0062] 1 It is commercially available from VWR International, LLC.

[0063] The corroded plate was prepared as in Example 1. The three solutions were applied to a board placed at an angle of approximately 80° to the horizontal. After 1 hou...

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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

Invention field [0001] The present invention relates to a method for removing rust from iron-containing surfaces and the like. Background of the invention [0002] During processing, or just during exposure to the atmosphere, a metal oxide layer, that is, rust, often forms on all or part of the ferrous metal surface, thereby impairing its appearance and / or adaptability for further use. One example is steel, such as low carbon steel used in the manufacture of various products. Therefore, it is often desirable to remove the metal oxide layer. Generally, such removal is accomplished by treating the rusted metal surface with a strong acid such as nitric acid, sulfuric acid, hydrochloric acid or phosphoric acid. However, these highly acidic, corrosive and violent chemicals are generally undesirable from an environmental and safety perspective. [0003] In some cases, the iron to be processed is positioned in a substantially vertical direction, such as may be the case of large structu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/08C11D11/00
CPCC11D3/1253C11D7/20C11D7/265C23G1/088C11D11/0029C23G1/08C11D11/00
Inventor M·J·鲍里克T·G·林根菲尔特N·J·西尔弗奈尔
Owner PPG IND OHIO INC
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