Steel phosphating liquid containing magnesium and nickel and phosphating method thereof

A technology of phosphating solution and iron and steel, which is applied in the direction of metal material coating process, etc., to achieve the effect of improving coating adhesion and good corrosion resistance

Inactive Publication Date: 2008-05-21
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the invention still uses toxic ingredients such as nitrite

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] In this embodiment, the formula of the phosphating solution is: magnesium oxide, 4.6g; calcium carbonate, 3.2g; nickel nitrate, 7.6g; sodium nitrate, sodium dodecylbenzenesulfonate 0.1g. The above compounds were dissolved in deionized water to prepare 1 liter of phosphating solution; and the pH value was adjusted to 3.10-3.15 with 30 g / L NaOH solution and 30% phosphoric acid.

[0024] Then, the A3 steel sheet that has been polished step by step with No. 1 to No. 6 sandpaper and degreased with acetone is derusted and activated with 1mol / L hydrochloric acid, and then put into the phosphating solution prepared above; at the same time, through The ozone generator passes ozone into the above-mentioned phosphating solution, keeps the ozone concentration in the phosphating solution at 1.6-1.8mg / L, and conducts the phosphating reaction at 40-42°C for 5 minutes. After the phosphating reaction is completed, the steel sheet is washed with deionized water for 1 minute, and then dri...

Embodiment 2

[0027] In this embodiment, the formula using the phosphating solution is exactly the same as that of the above-mentioned embodiment 1. The pre-treatment and post-treatment processes of the A3 steel sheet are also exactly the same as in the above-mentioned embodiment 1. The difference is: adjust the pH value of the phosphating solution to 2.5. The concentration of ozone passed into the above phosphating solution is 2.6 mg / L, and the phosphating is carried out at a temperature of 40-42° C. for 3 minutes.

[0028] The phosphating film formed after the phosphating process was inspected, and it was found that the phosphating film was light gray, the film was uniform and dense, and the film weight was 3.62g / m 2 . The result of the copper sulfate spot corrosion test is 192S; after soaking in 5% NaCl solution at room temperature, rust spots appear after 80 hours; the adhesion of the phosphating film reaches the first grade.

Embodiment 3

[0030] In this embodiment, the formula using the phosphating solution is exactly the same as that of the above-mentioned embodiment 1. The pre-treatment and post-treatment processes of the A3 steel sheet are also exactly the same as in the above-mentioned embodiment 1. The difference is: adjust the pH value of the phosphating solution to 3.5. The concentration of ozone passed into the above-mentioned phosphating solution is 1.4mg / L, and the phosphating is carried out at a temperature of 40-42°C for 10 minutes.

[0031] The phosphating film formed after the phosphating process was inspected, and it was found that the phosphating film was light gray, the film was uniform and dense, and the film weight was 5.22g / m 2 . The result of the copper sulfate spot corrosion test is 267S; soaked in 5% NaCl solution at room temperature, rust spots appear after 86 hours; the adhesion of the phosphating film reaches the first grade.

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Abstract

The invention relates to a magnesium-nickel contained steel phosphorization solution and a phosphorization method thereof. The components of the phosphorization solution and the concentration of each component are as follows: magnesium oxide of 4.5 to 4.8g/L, calcium carbonate of 3.0 to 3.5g/L, sodium nitrate of 1.5 to 2.5 g/L, and sodium dodecylbenzebesuefonate of 0.05 to 0.1g/L. The specific steps of the method are as follows: a steel sheet is put into the well-prepared phosphorization solution; the pH value of he phosphorization solution is kept at 2.0 to 4.0; ozone is input the ozone concentration is kept within the scope of 1.3 to 3.0 mg/L; a phosphorization reaction is in process under the temperature of 35 to 50 DGE C for 3 to 10 minutes; after the phosphorization is completed, the steel sheet is cleaned with the clean deion water and then dried. The phosphorization solution of the invention does not contain poisonous or carcinogenic Cr (VI), nitrite (NO2<->), nitrogen oxide (NOx), and other components. The phosphorization temperature is low and the film-forming is quick. Moreover, a phosphorization film formed with the invention is even and compact, and is provided with the good corrosion and abrasion resistance. In addition, the invention is provided with the effect of promoting the coating layer adhesive force, and so on.

Description

technical field [0001] The invention relates to a magnesium-nickel-containing iron and steel phosphating solution and a phosphating method thereof. Background technique [0002] Phosphating is to treat steel workpieces in a solution containing phosphate, oxidation accelerators, additives, etc., to form a phosphating film on the surface. The phosphating film has the functions of anti-corrosion, improving coating adhesion, lubricating and so on. [0003] In existing bibliographical reports, such as "Electroplating Process Handbook" (the second edition in August, 1997 of Machinery Industry Press); The phosphating accelerator in the solution often contains toxic or carcinogenic substances, such as Cr(VI), nitrite (NO 2 - ), or produce toxic nitrogen oxides (NO x ) and other ingredients. [0004] Chinese patent ZL200610019031.7 discloses a zinc-nickel-manganese ternary phosphating solution and its preparation method. According to the introduction, the phosphating film formed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/06C23C22/78C23C22/82
Inventor 陈烨璞盛敏奇贾瑞平张娟
Owner SHANGHAI UNIV
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