A kind of surface passivation treatment method of nickel base alloy
A nickel-based alloy and passivation treatment technology, which is applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc., can solve problems such as nickel-based alloy corrosion, prolong service life, increase corrosion resistance, attach focus on good effect
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Embodiment 1
[0022] Use 0.5mol / L HNO in the nickel base alloy reactor 3 Pickling with -5% NaCl solution, and then washing with water, and then drying it in a blast drying oven at 90°C for 1 hour. Replace the gas in the reactor with high-purity argon, and finally carry out the passivation treatment of the nickel-based alloy reactor according to the following passivation treatment scheme 1.
[0023] Passivation treatment scheme 1 is as follows:
[0024] The first stage: Heating the nickel-based alloy reactor to 100°C, during which the fluorine gas fraction is 30% F 2 / Ar mixture;
[0025] The second stage: heating the nickel-based alloy reactor from 100°C to 350°C, during which the flow rate of 0.2L / min is 30% F 2 / Ar mixture;
[0026] The third stage: Keep the nickel-based alloy reactor at a constant temperature of 350°C for 3 hours, during which the flow rate is 0.1L / min and F with a fluorine gas fraction of 30% is introduced. 2 / Ar mixture;
[0027] The fourth stage: naturally cool ...
Embodiment 2
[0030] Use 1.0mol / L HNO in the nickel base alloy reactor 3 Pickling with -5% NaCl solution, then washing with water, and then drying it in a blast drying oven at 100°C for 5 hours. Replace the gas in the reactor with high-purity argon, and finally carry out the passivation treatment of the nickel-based alloy reactor according to the following passivation treatment scheme 2.
[0031] Passivation treatment scheme 2 is as follows:
[0032] The first stage: Heating the nickel-based alloy reactor to 130°C, during which the fluorine gas fraction is 20% F 2 / Ar mixture;
[0033] The second stage: Heating the nickel-based alloy reactor from 100°C to 400°C, during the period, according to the flow rate of 0.1L / min, F with a fluorine gas fraction of 20% 2 / Ar mixture;
[0034] The third stage: Keep the nickel-based alloy reactor at a constant temperature of 400 ° C for 6 hours, during which the flow rate is 0.2 L / min, and the fluorine gas fraction is 20% F 2 / Ar mixture;
[0035] ...
Embodiment 3
[0038] Use 1.5mol / L HNO in the nickel base alloy reactor 3 Pickling with -5% NaCl solution, and then washing with water, and drying in a vacuum oven at 110°C for 10 hours. Replace the gas in the reactor with high-purity argon, and finally carry out the passivation treatment of the nickel-based alloy reactor according to the following passivation treatment scheme 3.
[0039] Passivation treatment scheme 3 is as follows:
[0040] The first stage: Heating the nickel-based alloy reactor to 150°C, during which the flow rate of 0.1L / min is 0.1L / min. 2 / Ar mixture;
[0041] The second stage: Heating the nickel-based alloy reactor from 150°C to 500°C, during the period, according to the flow rate of 0.3L / min, F with a fluorine gas fraction of 5% 2 / Ar mixture;
[0042]The third stage: Keep the nickel-based alloy reactor at a constant temperature of 500°C for 5 hours, during which the flow rate is 0.2L / min and F with a fluorine gas fraction of 5% is introduced. 2 / Ar mixture;
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