Stainless steel coloring liquid and coloring method
A technology of stainless steel and coloring liquid, applied in the direction of anodic oxidation, etc., can solve the problems of cancer, vanadium poisoning, etc., and achieve the effects of good environmental performance, low temperature, good wear resistance and corrosion resistance
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[0031] The preparation method of the coloring liquid is preferably: dissolve the weighed sodium hydroxide, trisodium phosphate and sodium nitrate with a small amount of distilled water, add distilled water to a specified volume after mixing, and bring the concentration of each solute to the above range.
[0032] The invention also discloses a stainless steel coloring method, which includes the following steps:
[0033] The pre-treated stainless steel sample is used as the positive electrode, and the lead plate is used as the negative electrode, and electrolytic coloring is performed in the stainless steel coloring solution described in the above technical scheme.
[0034] According to the present invention, a pre-treated stainless steel sample is first provided. The stainless steel is preferably 316, 304 or SUS304 stainless steel. The pretreatment preferably includes chemical degreasing, electrolytic polishing and activation in sequence. The chemical degreasing method is preferably...
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[0044] Example 1
[0045] After chemical degreasing, electrolytic polishing and activation treatment of stainless steel of model 1Cr18, it is put into the prepared electrolytic coloring solution of the invention as anode, and the cathode is lead plate.
[0046] The electrolyte composition is: sodium hydroxide 200g / L, trisodium phosphate 8g / L, sodium nitrate 10g / L;
[0047] The operating parameters of electrolytic coloring are: anode current density 0.3A / dm 2 , Water bath temperature is 50℃, time is 10 minutes.
[0048] The resulting colored film is golden yellow. After electrolytic coloring treatment, the surface EDS energy spectrum analysis is as follows: figure 1 As shown, the result shows that the surface layer composition is: 55.68Fe10.06Cr10.04Mn1.66Si22.56O (atomic percentage).
Example Embodiment
[0049] Example 2:
[0050] Using Japanese SUS304 stainless steel sheet, after chemical degreasing, electrolytic polishing and activation treatment, it is put into the prepared electrolytic coloring solution of the invention as anode, and the cathode is lead plate.
[0051] The electrolytic coloring process parameters are: sodium hydroxide 500g / L, sodium nitrate 8g / L, potentiostat control voltage 2.2V, water bath temperature 100°C, time 15 minutes.
[0052] The obtained colored film is also golden yellow, and the colored film is smooth, bright and uniform in color.
[0053] The test result proves that the colored film can withstand the back and forth rubbing with 200g of rubber to not change color for more than 70 cycles, and it can withstand the 3.5% sodium chloride solution soaking for 480 hours.
[0054] figure 2 For the EDS energy spectrum analysis of the surface after the coloring treatment, the data shows that the surface layer composition is: 45.64Fe13.70Cr6.74Ni0.85Si12.59C20.7...
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