Corrosion-resistant colored film of austenite thin-wall stainless steel pipe and preparation method of corrosion-resistant colored film
A stainless steel pipe and austenitic technology, which is applied in the field of corrosion-resistant coloring film and its preparation for austenitic thin-walled stainless steel pipes, can solve the problem of unsatisfactory color uniformity and reproducibility, poor abrasion resistance and aging resistance, Can not achieve the same life of the base material and other problems, to achieve good environmental protection benefits, good decorative effect, not easy to age and fall off
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[0040] Example 1
[0041] (1) Pre-treatment: Clean the surface of the 304 thin-walled stainless steel pipe (DN15), put it in lye and treat it at 90°C for 25 minutes to remove the surface oil, and then clean the stainless steel pipe with clean water. The lye used here is Contains 60 g / L NaOH, 20 g / L Na 2 CO 3 And 40 g / L Na 3 PO 4 的mixed aqueous solution;
[0042] (2) Pickling: Put the cleaned stainless steel tube into the 220 g / L HNO 3 Soak in 50 g / L HF pickling solution at 65°C for 10 minutes, and clean the stainless steel tube after completion;
[0043] (3) Passivation: Put the pickled stainless steel tube into 250g / L HNO at room temperature 3 Medium passivation treatment for 20 minutes, after the passivation layer on the surface of the pipe is formed completely, take out the stainless steel pipe and clean it with clean water;
[0044] (4) Coloring: Put the passivated stainless steel tube into a chemical coloring liquid for coloring. The coloring temperature is 75℃, the coloring time...
Example Embodiment
[0048] Example 2
[0049] (1) Pre-treatment: the surface of 304 thin-walled stainless steel pipe (DN50) is cleaned after preliminary mechanical polishing, put in lye and treated at 90°C for 25 minutes to remove the surface oil, and clean the stainless steel pipe with clean water again. The lye used here contains 60 g / L NaOH, 20 g / L Na 2 CO 3 And 40 g / L Na 3 PO 4 的mixed aqueous solution;
[0050] (2) One-step pickling and passivation treatment: Put the cleaned steel pipe into a two-in-one pickling and passivation solution and soak for 20 minutes. After the passivation layer on the surface of the pipe is formed, take out the pipe and clean it with hot water. , The mixed treatment solution used here is 300 g / L HNO 3 , 25 g / L HF, 60 g / L HCl and 1 g / L hexamethylenetetramine, the temperature is room temperature;
[0051] (3) Coloring: Put the stainless steel tube after one-step pickling passivation treatment into a chemical coloring solution for coloring, the coloring temperature is 85℃, ...
Example Embodiment
[0055] Example 3
[0056] (1) Pretreatment: Clean the surface of the thin-walled austenitic stainless steel pipe, put it in lye and treat it at 90℃ for 25 minutes to remove the surface oil stains, and clean the stainless steel pipe with clean water again. The lye used here contains 60 g / L NaOH, 20 g / L Na 2 CO 3 And 40 g / L Na 3 PO 4 的mixed aqueous solution;
[0057] (2) Pickling: Put the cleaned stainless steel tube into the water containing 220 g / L H 2 SO 4 And 100 g / L HCl pickling solution, soak at 20℃ for 15 minutes, clean the stainless steel tube after completion;
[0058] (3) Passivation: Put the pickled stainless steel tube into 220g / L HNO at room temperature 3 Passivation treatment with 30g / L sodium dichromate passivation solution for 30 minutes, after the passivation layer on the surface of the pipe is formed, take out the stainless steel pipe and clean it with clean water;
[0059] (4) Coloring: Put the passivated stainless steel tube into a chemical coloring liquid for colori...
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