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Steel medium temperature phosphating solution and preparation method and application method thereof

A phosphating solution and steel technology, applied in the direction of metal material coating process, etc., can solve the problems of application and further development limitations, complicated phosphating operation procedures, complex phosphating formula components, etc., and achieve good phosphating effect, excellent Corrosion resistance, energy saving effect

Inactive Publication Date: 2019-06-21
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The phosphating formula has complex components, and selenous acid is toxic and expensive, which increases the cost of raw materials, so its application and further development are limited
Chinese invention patent application CN102605364A discloses a medium-temperature, low-sludge, low-emission thick-film phosphating solution and its phosphating method. This patent needs to use titanium salt surface adjustment before the phosphating of the workpiece, which makes the phosphating operation procedure complicated.

Method used

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  • Steel medium temperature phosphating solution and preparation method and application method thereof
  • Steel medium temperature phosphating solution and preparation method and application method thereof
  • Steel medium temperature phosphating solution and preparation method and application method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-6

[0025] Phosphating solutions (see Table 1) and their phosphating effects were tested using different amounts of Mariv salt.

[0026] Table 1

[0027] components Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Maziv salt (g) 10 20 30 50 55 60 Zinc nitrate (g) 35 35 35 35 35 35 Nickel nitrate (g) 7 7 7 7 7 7 Sodium chlorate (g) 6 6 6 6 6 6 Citric acid (g) 3 3 3 3 3 3 water to 1L to 1L to 1L to 1L to 1L to 1L

[0028] Six kinds of phosphating solutions in Examples 1-6 were used for phosphating treatment of iron and steel pieces, and the pH value was adjusted to 2.3. The phosphating temperature is 60°C, and the phosphating time is 30 minutes. According to GB 6807-86 "Technical Conditions for Phosphating Treatment of Iron and Steel Parts Before Painting", the prepared phosphating film was tested by copper sulfate drop test and 3% sodium chloride solution immersion test to ...

Embodiment 7-11

[0033] Phosphating solutions (see Table 3) and their phosphating effects were tested using different amounts of zinc nitrate.

[0034] table 3

[0035] components Example 7 Example 8 Example 9 Example 10 Example 11 Zinc nitrate (g) 20 25 30 35 40 Maziv salt (g) 55 55 55 55 55 Nickel nitrate (g) 6 6 6 6 6 Sodium chlorate (g) 8 8 8 8 8 Citric acid (g) 2 2 2 2 2 water to 1L to 1L to 1L to 1L to 1L

[0036] Five kinds of phosphating solutions in Examples 7-11 were used for phosphating treatment of iron and steel pieces, and the pH value was adjusted to 2.5. The phosphating temperature is 65°C, and the phosphating time is 25 minutes. According to GB 6807-86 "Technical Conditions for Phosphating Treatment of Iron and Steel Parts Before Painting", the prepared phosphating film was tested by copper sulfate drop test and 3% sodium chloride solution immersion test to judge the phosphating effect of...

Embodiment 12-17

[0041] Phosphating solutions (see Table 5) and their phosphating effects were tested using different amounts of nickel nitrate.

[0042] table 5

[0043] components Example 12 Example 13 Example 14 Example 15 Example 16 Example 17 Nickel nitrate (g) 0 1 3 5 7 9 Maziv salt (g) 50 50 50 50 50 50 Zinc nitrate (g) 30 30 30 30 30 30 Sodium chlorate (g) 6 6 6 6 6 6 Citric acid (g) 1 1 1 1 1 1 water to 1L to 1L to 1L to 1L to 1L to 1L

[0044] The 6 kinds of phosphating solutions in Examples 12-17 were used for phosphating treatment of iron and steel parts, and the pH value was adjusted to 2.5. The phosphating temperature is 70°C, and the phosphating time is 15 minutes. According to GB 6807-86 "Technical Conditions for Phosphating Treatment of Iron and Steel Parts Before Painting", the prepared phosphating film was tested by copper sulfate drop test and 3% sodium chloride solution immer...

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Abstract

The invention belongs to the technical field of steel surface treatment, and particularly relates to a steel medium temperature phosphating solution and a preparation and application method thereof. The phosphating solution is prepared from each 1 L phosphating solution containing 20-55 g of manganous dihydrogen phosphate, 25-35 g of zinc nitrate, 1-9 g of nickel nitrate, 2-8 g of sodium chlorate,0.5-4.0 g of complexation promoter and the balance of water. Medium temperature phosphating is adopted in the phosphating solution, energy is saved, a formed phosphating film is enabled to be uniformand compact, and good corrosion resistance performance is achieved.

Description

technical field [0001] The invention belongs to the technical field of iron and steel surface treatment, and in particular relates to a medium-temperature phosphating solution for iron and steel, a preparation method and a use method thereof. Background technique [0002] Iron and steel phosphating refers to a process in which a series of chemical or electrochemical reactions occur between iron and steel and phosphoric acid or its acidic salt solution, and a phosphate film, that is, a phosphating film, is formed on the surface of the steel. The main functions of iron and steel phosphating are: to enhance the bonding force between the coating film (such as paint coating) and steel parts, to improve the corrosion resistance of the surface coating of steel parts after painting; to improve the decoration of steel parts; to improve the corrosion resistance of steel parts Wear resistance; make steel parts lubricious during machining, etc. The iron and steel phosphating process ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/50
Inventor 胡秀英胡贵芳姚鹏飞江鑫慧陈旭蒋敏
Owner JIANGSU UNIV OF TECH
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