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Normal temperature environment-friendly phosphating solution for steel and application thereof

A kind of phosphating solution, an environment-friendly technology, applied in the direction of metal material coating process, etc., can solve the problems of high operating temperature, complex composition, and no disclosed accelerator composition, etc., achieve good corrosion resistance, simple phosphating process, phosphorus good effect

Inactive Publication Date: 2019-03-15
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The composition of the formula is complex, which increases the production cost, and also contains hexavalent chromium, which is seriously harmful to the environment and human body, and is not suitable for industrialization.
Chinese invention patent application CN102817023A discloses a high-temperature corrosion-resistant phosphating solution, which is composed of phosphoric acid, zinc oxide, sodium molybdate, citric acid, zinc nitrate, nitric acid, nickel nitrate, chromic acid and water. It also contains hexavalent chromium, which destroys the environmental protection of the phosphating solution, and the preparation cycle of the phosphating solution is more than 24 hours, and it needs to be heated to 80-95°C when used, the operating temperature is relatively high, and the energy consumption is too high. Big
Chinese invention patent application CN103469190A discloses a composite low-temperature phosphating solution, which consists of zinc oxide, phosphoric acid, dihydrogen phosphate, sodium hexametaphosphate, sodium dihydrogen phosphate, cyclohexyl hexaphosphate, Methyl methacrylate, accelerator, oxalic acid, and thiourea are also composed of complex ingredients, and the patent does not disclose the composition of the accelerator, nor does it disclose the phosphating operation time, so it is not convenient for practical use

Method used

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  • Normal temperature environment-friendly phosphating solution for steel and application thereof
  • Normal temperature environment-friendly phosphating solution for steel and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～ Embodiment 5

[0027] Example 1 to Example 5: Phosphating solution (see Table 1) using different amounts of zinc oxide and its phosphating effect experiment.

[0028] Table 1

[0029] Component

[0030] The five phosphating solutions in Examples 1 to 5 were used for the phosphating treatment of steel parts, and the pH value was adjusted to 2.4. The ultrasonic power is 210W, the phosphating temperature is 22℃, and the phosphating time is 30min. According to GB 6807-86 "Technical Conditions for Phosphating Treatment of Steel Parts Before Painting", the prepared phosphating film adopts copper sulfate drop test and 3% sodium chloride solution immersion test to judge the phosphating of steel parts by phosphating solution The performance and the results are shown in Table 2.

[0031] Table 2

[0032] project

[0033] It can be seen from Table 2 that when the zinc oxide concentration increases from 9g / L to 15g / L, the corrosion resistance of the phosphate coating gradually increases; when the mass c...

Embodiment 6～ Embodiment 11

[0034] Example 6 to Example 11: Phosphating solution (see Table 3) using different amounts of manganese nitrate and its phosphating effect experiment.

[0035] table 3

[0036] Component

[0037] The 6 phosphating solutions in Examples 6-11 were used for the phosphating treatment of steel parts, and the pH value was adjusted to 2.6. The ultrasonic power is 200W, the phosphating temperature is 30℃, and the phosphating time is 25min. According to GB 6807-86 "Technical Conditions for Phosphating Treatment of Steel Parts Before Painting", the prepared phosphating film adopts copper sulfate drop test and 3% sodium chloride solution immersion test to judge the phosphating of steel parts by phosphating solution The performance and the results are shown in Table 4.

[0038] Table 4

[0039] project

[0040] It can be seen from Table 4 that when the concentration of manganese nitrate is gradually increased from no addition to 4g / L, the corrosion resistance of the phosphating film gradu...

Embodiment 12～ Embodiment 17

[0041] Example 12 to Example 17: Phosphating solution (see Table 5) with different dosages of hydroxylamine sulfate and its phosphating effect experiment.

[0042] table 5

[0043] Component

[0044] The 6 phosphating solutions in Examples 12-17 were used for the phosphating treatment of steel parts, and the pH value was adjusted to 2.5. The ultrasonic power is 190W, the phosphating temperature is 35℃, and the phosphating time is 20min. According to GB 6807-86 "Technical Conditions for Phosphating Treatment of Steel Parts Before Painting", the prepared phosphating film adopts copper sulfate drop test and 3% sodium chloride solution immersion test to judge the phosphating of steel parts by phosphating solution The performance and the results are shown in Table 6.

[0045] Table 6

[0046] project

[0047] It can be seen from Table 6 that when the HAS concentration increases from 0g / L to 12g / L, the corrosion resistance of the phosphating film also increases, and when it is great...

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Abstract

The invention relates to the technical field of steel surface treatment and a normal temperature environment-friendly phosphating solution for steel and an application thereof. Specifically, the phosphating solution provided by the invention comprises zinc oxide, phosphoric acid, manganese nitrate, reductive accelerant, citric acid and water; wherein each 1L of phosphating solution comprises 37-53ml of phosphoric acid, 9-21g of zinc oxide, 1-10g of manganese nitrate, 2-16g of reductive accelerant, 0.5-3.5g of citric acid and the balance of water. The phosphating solution provided by the invention has simple formula and low treatment cost; phosphorization can be carried out at normal temperature so as to save energy; without chromium in the phosphating solution, the toxic problem of chromium to environment and human body can be avoided; phosphating film layer formed by phosphorization under ultrasonic action is uniform and compact and has excellent corrosion resistance. The dropping time of the copper sulfate of the obtained phosphating film can reach 213s, the soaking time of 3% NaCl solution exceeds 6h, and the film weight can reach 6.5-7.3g / m2.

Description

Technical field [0001] The invention relates to the technical field of iron and steel surface treatment, in particular to an environment-friendly phosphating solution for iron and steel at room temperature and its application. Background technique [0002] Steel is the most widely used structural material in modern times. In order to make it able to withstand the corrosion of oxygen and water in the atmosphere, steel materials are usually surface treated to form a film on the surface that can protect the metal from water and other corrosive media. For example, the surface of steel materials can be phosphated, that is, a stable, insoluble phosphate film is formed on the metal surface through chemical or electrochemical reactions to enhance the corrosion resistance of the substrate and prolong the service life. The phosphating film has good corrosion resistance, which can transform the steel from a good conductor to a poor conductor, thereby inhibiting the formation of micro-batte...

Claims

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Application Information

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IPC IPC(8): C23C22/18
CPCC23C22/182
Inventor 胡秀英胡贵芳李明红宋皖杰王琼
Owner JIANGSU UNIV OF TECH
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