Stainless steel passivation water solution and preparation method thereof
An aqueous solution, stainless steel technology, applied in the direction of metal material coating process, etc., can solve the problems of poor corrosion resistance and environmental protection, and achieve the effect of good corrosion resistance, easy copper plating, and dense passivation layer
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[0023] The present invention also provides a method for preparing the stainless steel passivation solution of the present invention, which comprises the steps of: 1) weighing molybdate, sodium citrate and sulfamate, and mixing the three, adding water and stirring to dissolve to obtain solution I; 2 ) Weigh benzotriazole and thiosemicarbazide, mix and stir and dissolve them to obtain solution II; 3) Mix and stir solution I and solution II, add organic phosphoric acid, and finally add a pH regulator to adjust the pH to obtain stainless steel passivation aqueous solution.
[0024] Injection molding of stainless steel and plastic can improve the mechanical properties of the plastic shell. However, for the electroplating surface treatment of plastics containing stainless steel, since many surface treatment agents are strong acid, strong alkali and strong oxidizing agents, it is necessary to passivate the stainless steel. So that the stainless steel will not be corroded or discolore...
Embodiment 1
[0029] 1. Prepare passivation solution: in every liter of water, the weight parts of the following raw materials are: sodium molybdate 10g / L, sodium sulfamate 2g / L, hydroxyethylene diphosphonic acid 1ml / L, lemon Sodium 15g / L, benzotriazole 1g / L, thiosemicarbazide 1g / L; pH was adjusted to 9.5 with sodium hydroxide to obtain passivation solution;
[0030] 2. Passivation treatment: The 301 stainless steel plate is passivated in the above passivation solution for 60 minutes, and the passivation temperature is 65°C. After the passivation is completed, it is washed with water for use or dried for storage.
[0031] 3. Performance test
[0032] ①Neutral salt spray test: Referring to the international GB / T 10125-1997, after 168 hours of neutral salt spray test, the white rust on the surface of the sample is less than 2%, indicating that the passive film has good corrosion resistance.
[0033] ② Electroless copper plating experiment: Put the stainless steel passivated in the above step...
Embodiment 2
[0035]1. Prepare passivation solution: in every liter of water, the weight parts of the following raw materials are: sodium molybdate 15g / L, sodium sulfamate 3g / L, hydroxyethylidene diphosphonic acid 15ml / L, lemon Sodium bicarbonate 10g / L, benzotriazole 7g / L, thiosemicarbazide 0.7g / L; Regulate pH with sodium hydroxide to be 10.5, obtain passivation solution;
[0036] 2. Passivation treatment: 301 stainless steel plate was passivated in the above passivation solution for 60 minutes, and the passivation temperature was 65°C. After passivation, it was washed with water for use or dried for storage.
[0037] 3. Performance test
[0038] ①Neutral salt spray test: With reference to the international GB / T 10125-1997, after 168 hours of neutral salt spray test, the white rust on the surface of the sample is less than 1%, indicating that the passive film has good corrosion resistance.
[0039] ② Electroless copper plating experiment: put the passivated stainless steel in the above ste...
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