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
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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
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