Phosphating method using ozone as steel iron phosphating accelerator
A phosphating accelerator and ozone technology, which is applied in the coating process of metal materials, etc., can solve the problems of easy generation of phosphating residue and difficulty in stabilizing the concentration of hydrogen peroxide in the phosphating solution, and achieve fast film formation and low working temperature , good corrosion resistance effect
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Embodiment 1
[0026] In this example, the formulation of the phosphating solution is: ZnO 5.5g, KNO 3 8.0g, H 3 PO 3 (85%) 14ml, (NH 4 ) 6 m O7 o 24 4H 2 O 0.1g, sodium lauryl sulfate 0.15g; the above compounds were dissolved in deionized water to prepare 1 liter of phosphating solution; and the pH value was adjusted to 2.85 with 30g / L NaOH solution and 30% phosphoric acid.
[0027] 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 1.5mg / L, and conducts the phosphating reaction at 40°C for 15 minutes. After the phosphating reaction is completed, the steel sheet is washed with deionized water for 1 minute, and then dried with hot air at 75...
Embodiment 2
[0030] In this embodiment, the formula using the phosphating solution is exactly the same as that of the above-mentioned embodiment 1. Its pH is 2.85.
[0031] The pretreatment process of the A3 steel sheet is also exactly the same as the above-mentioned embodiment 1. The difference is: the concentration of ozone passed into the above phosphating solution is 2.6mg / L, and the phosphating is performed at 40°C for 15 minutes.
[0032] The phosphating film formed after the phosphating process was inspected, and it was found that the phosphating film was gray-black, uniform and dense, and the film weight was 2.64g / m 2 . The result of the copper sulfate spot corrosion test is 112S; after soaking in 5% NaCl solution at room temperature, rust spots appear after 71 hours; the adhesion of the phosphating film reaches the first grade.
Embodiment 3
[0034] In this embodiment, the formulation of the phosphating solution is exactly the same as that of the above-mentioned embodiment 2. Its pH is 2.85.
[0035] The phosphating treatment process of the A3 steel sheet is also exactly the same as that of the above-mentioned embodiment 2. The difference is: wash with deionized water for 1 minute and soak in 0.01mol / L ammonium phenylene diphosphate diester solution for 50 minutes. Then dry it with hot air at 75°C.
[0036] The phosphating film formed after the phosphating process was inspected, and it was found that the phosphating film was gray-black, uniform and dense, and the film weight was 2.68g / m 2 . The result of the copper sulfate spot corrosion test is 419S; soaked in 5% NaCl solution at room temperature, rust spots appear after 114 hours; the adhesion of the phosphating film reaches the first grade.
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Abstract
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