Passivation method of stainless steel heat dissipation device

Abstract

The invention provides a passivation method for a stainless steel heat dissipation device, and relates to the technical field of stainless steel surface passivation treatment.The passivation method comprises the following steps that a passivation container is prepared, and a semi-finished stainless steel uniform-temperature plate subjected to laser edge sealing is placed in the passivation container; adding a certain amount of ultrapure water into the passivation container 2, and isolating the semi-finished product of the stainless steel uniform-temperature plate from air; the passivation container is heated and pressurized for a certain period of time, a Fe3O4 passivation layer is generated on the surface of a semi-finished product of the stainless steel uniform-temperature plate, the stainless steel uniform-temperature plate is passivated for a certain period of time only through water vapor in the air-isolated, high-temperature and high-pressure environment, iron in stainless steel reacts with the water vapor at the high temperature and high pressure, Fe3O4 is generated, and the good passivation effect is achieved. The technical problem that the long-term reliability of the stainless steel vapor chamber is affected due to the fact that high-temperature natural passivation is mainly used for secondary passivation of the stainless steel vapor chamber in the current industry and the protection effect of a passivation layer is poor is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of stainless steel surface passivation treatment, in particular to a passivation method for a stainless steel heat dissipation device. BACKGROUND

[0002] A stainless steel vapor chamber is a phase-change heat dissipation device widely used in recent years, and water is usually used as the internal working medium. However, stainless steel and water are incompatible, and the two will react to generate hydrogen, which will destroy the vacuum degree inside the phase-change heat dissipation device and affect the long-term reliability of the stainless steel vapor chamber. Therefore, the surface of the stainless steel vapor chamber is passivated during processing. The principle of passivation is to form a dense oxide film on the outer surface of the stainless steel to prevent the stainless steel from directly contacting water and reacting.

[0003] Taking a stainless steel vapor chamber as an example, the common passivation methods in the industry are as follows: primary passivation uses high-temperature natural passivation or chemical passivation; secondary passivation uses high-temperature natural passivation, and chemical passivation usually uses pickling process to leave a continuous Cr2O3 layer on the surface of the stainless steel. The Cr2O3 layer has a dense structure and good protection effect. High-temperature natural passivation will form Cr2O3, Fe2O3 and FeO on the surface of the stainless steel at the same time. The Fe2O3 and FeO layers are relatively loose and have poor protection effect.

[0004] In summary, since the secondary passivation of the stainless steel vapor chamber in the current industry mainly uses high-temperature natural passivation, the protection effect of the passivation layer is poor, which affects the long-term reliability of the stainless steel vapor chamber. SUMMARY

[0005] The present application provides a passivation method for a stainless steel heat dissipation device to solve the technical problem that the secondary passivation of the stainless steel vapor chamber in the current industry mainly uses high-temperature natural passivation, the protection effect of the passivation layer is poor, and the long-term reliability of the stainless steel vapor chamber is affected.

[0006] To solve the above technical problem, the present application discloses a passivation method for a stainless steel heat dissipation device, which comprises the following steps:

[0007] Step 1: Prepare a passivation container and put the semi-finished product of the laser-sealed stainless steel vapor chamber into it.

[0008] Step 2: Add a certain amount of ultrapure water to the passivation container, and isolate the semi-finished product of the stainless steel vapor chamber from the air.

[0009] Step 3: Heat and pressurize the passivation container for a certain period of time to form a Fe3O4 passivation layer on the surface of the semi-finished product of the stainless steel vapor chamber.

[0010] Preferably, the passivation container includes any one of a pressure vessel and a vacuum vessel.

[0011] Preferably, the isolation method of step 2 is to place the semi-finished stainless steel temperature equalizing plate into a pressure vessel, and then inject ultrapure water into the pressure vessel so that the ultrapure water covers the stainless steel temperature equalizing plate.

[0012] Preferably, the pressure vessel is heated and pressurized so that the temperature of the ultrapure water reaches 120° C.-200° C., the internal pressure of the pressure vessel reaches 0.198 MPa-1.554 MPa, and the passivation time of heating and pressurizing is greater than 2 hours.

[0013] Preferably, the isolation method of step 2 can also be to place the semi-finished stainless steel temperature equalizing plate into a vacuum container, evacuate the vacuum container so that the internal pressure of the vacuum container is less than 0.0025 MPa, and then inject ultrapure water into the vacuum container, wherein the amount of ultrapure water is less than 1 / 2000 of the capacity of the vacuum container.

[0014] Preferably, the vacuum container is heated and pressurized so that the temperature of the ultrapure water is greater than 250° C. and the pressure is greater than 0.198 MPa, and the passivation time of heating and pressurizing is greater than 2 hours.

[0015] Preferably, heaters are symmetrically provided on the left and right sides of the lower end of the passivation container, a passivation chamber is provided in the middle of the upper end of the passivation container, a cover is rotatably provided on the upper end of the passivation chamber, the left and right sides of the passivation chamber are symmetrically connected with a water inlet and an air duct, the water inlet and the air duct are distributed up and down, a water storage shell is symmetrically provided on the left and right sides of the upper end of the passivation container, a water storage chamber is provided inside the water storage shell, the water storage chamber is connected with the passivation chamber through the water inlet, a return water port is provided at the lower end of the passivation chamber, the left and right sides of the return water port are symmetrically connected with water inlet channels, the water inlet channels are correspondingly connected with the water inlet pipe through the switching chamber, and the water inlet pipe is connected with the water storage chamber.

[0016] Preferably, support blocks are symmetrically provided on the left and right sides of the lower end of the passivation chamber, and a number of guide wheels are provided at the inclined ends of the support blocks. The support blocks are fixedly connected to a threaded sleeve 1, which passes through the side end of the passivation chamber and is threadedly connected to a threaded rod 1, which is fixedly connected to the motor, and the motor is fixedly connected to the lower end of the water storage shell, and the threaded rod 1 is fixedly connected to a bevel gear 1, which is meshed with a bevel gear 2, and the bevel gear 2 is fixedly connected to a threaded sleeve 2, and the threaded sleeve 2 is rotatably set at the lower end of the water storage shell, and the threaded sleeve 2 is threadedly connected to the threaded rod 2, and the threaded rod 2 is fixedly connected to the lower end of the push plate, and the push plate is slidably set in the water storage chamber.

[0017] Preferably, a sliding plate is slidably arranged in the backwater outlet, the lower end of the sliding plate is fixedly connected with the connecting block, the connecting block penetrates the upper end of the buffer shell into the buffer cavity and is fixedly connected with the sealing plate, the sealing plate is slidably arranged in the buffer cavity, the buffer shell is arranged at the lower end of the passivation container, the lower end of the buffer shell is provided with a pressure relief port, a stop block is correspondingly matched in the pressure relief port, the stop block is fixedly connected with the connecting plate, a plurality of springs are fixedly arranged between the connecting plate and the lower end of the buffer shell, air supply channels are symmetrically communicated with the left and right sides of the buffer cavity, the air supply channels are correspondingly communicated with the air passage through the switching cavity, an installation block is rotatably arranged in the switching cavity, a switching pipe is installed on the installation block, a communication hole is penetratingly arranged on the switching pipe, a power pump is installed on the switching pipe, the installation block is fixedly connected with a connecting shaft, the connecting shaft penetrates the front end of the communication hole and is fixedly connected with a gear, the gear is engaged with a rack, the rack is fixedly connected with a second connecting block, the second connecting block is provided with a matching hole through which the water inlet pipe passes, the second connecting block is fixedly connected with a third connecting block, and the third connecting block penetrates the side end of the passivation container into the passivation cavity and is fixedly connected with a supporting block.

[0018] Preferably, a support column is arranged at the lower end of the passivation container, a maintenance opening is symmetrically arranged at the left and right sides of the lower end of the passivation container, the maintenance opening is communicated with the water inlet channel, a filter screen is slidably arranged in the maintenance opening, the filter screen is fixedly connected with a first pushing block, the inclined end of the first pushing block is slidably connected with the inclined end of a second pushing block, the first pushing block is slidably arranged in the maintenance opening, the second pushing block is slidably arranged in a sliding opening, the sliding opening is communicated with the maintenance opening, a spring is fixedly arranged between the second pushing block and the sliding opening, the sliding opening is communicated with the air supply channel through a communication opening, and the maintenance opening and the air supply channel are distributed front and back.

[0019] The technical scheme of the present application will be further described in detail below with reference to the drawings and examples.

[0020] The present application has the following beneficial effects:

[0021] The stainless steel uniform temperature plate 1 is passivated in an environment of air isolation, high temperature and high pressure for a certain period of time only through water vapor, and only Fe3O4 is generated in the reaction of iron in the stainless steel with water vapor under high temperature and high pressure, and the structure of Fe3O4 is dense, which has a good protective effect on the stainless steel uniform temperature plate 1 as a passivation layer component. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of the specification, illustrate the present application together with the examples, and do not constitute a limitation on the present application. In the drawings:

[0023] Figure 1 The process flow chart of the present application is shown in the figure;

[0024] Figure 2 The passivation container structure diagram of the present application is shown in the figure;

[0025] Figure 3 for Figure 2 Schematic diagram of the enlarged structure of area A;

[0026] Figure 4 for Figure 2 Schematic diagram of the enlarged structure of area B.

[0027] Figure: 1, stainless steel temperature plate; 2, passivation container; 3, passivation chamber; 4, cover plate; 5, water inlet; 6, water storage shell; 7, water storage chamber; 8, water return port; 9, water inlet channel; 10, support; 11, switching chamber; 12, air duct; 13, air supply channel; 14, motor; 15, threaded rod 1; 16, bevel gear 1; 17, bevel gear 2; 18, threaded sleeve 2; 19, threaded rod 2; 20, threaded sleeve 1; 21, support block; 22, guide wheel; 23, connecting block 3; 24, sliding plate; 2 5. Connecting block; 26. Sealing plate; 27. Buffer shell; 28. Buffer chamber; 29. ​​Pressure relief port; 30. Block; 31. Mounting block; 32. Connecting hole; 33. Matching hole; 34. Connecting block 2; 35. Rack; 36. Gear; 37. Heater; 38. Water inlet pipe; 39. Maintenance port; 40. Filter; 41. Push block 1; 42. Push block 2; 43. Spring 2; 44. Connecting port; 45. Sliding port; 46. Push plate; 47. Switching tube; 48. Spring 1; 49. Connecting plate. DETAILED DESCRIPTION

[0028] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0029] In addition, in the present invention, descriptions such as "first" and "second" are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions and technical features between the various embodiments can be combined with each other, but this must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0030] The present invention provides the following embodiments

[0031] Example 1

[0032] The embodiment of the present invention provides a passivation method for a stainless steel heat sink. Figure 1As shown, the following steps are included:

[0033] Step 1: Prepare a passivation container 2 and place the semi-finished stainless steel temperature plate 1 after laser edge sealing;

[0034] Step 2: Add a certain amount of ultrapure water to the passivation container 2 and isolate the semi-finished product of the stainless steel temperature plate 1 from the air;

[0035] Step 3: heating and pressurizing the passivation container 2 for a certain period of time to form a Fe3O4 passivation layer on the surface of the semi-finished stainless steel temperature plate 1;

[0036] The passivation container 2 includes either a pressure container or a vacuum container.

[0037] The beneficial effects of the above technical solution are:

[0038] The iron in stainless steel can generate Fe3O4 when reacting with water vapor under high temperature and high pressure. Fe3O4 has a dense structure and has a good protective effect as a component of the passivation layer. In order to prevent the generation of Fe2O3 and FeO in the passivation layer on the surface of the stainless steel and only generate Fe3O4, the stainless steel heat spreader 1 (which can also be a stainless steel heat pipe) is passivated only by water vapor for a certain period of time in an air-isolated, high-temperature and high-pressure environment to achieve a good passivation effect. This solves the technical problem that the secondary passivation of stainless steel heat spreaders in the current industry mainly uses high-temperature natural passivation, which results in poor passivation layer protection, thereby affecting the long-term reliability of the stainless steel heat spreader.

[0039] Example 2

[0040] On the basis of Example 1, Figure 1 As shown, the isolation method of step 2 is to place the semi-finished stainless steel temperature plate 1 into a pressure vessel, and then inject ultrapure water into the pressure vessel so that the ultrapure water covers the stainless steel temperature plate 1;

[0041] The pressure vessel is heated and pressurized so that the temperature of the ultrapure water reaches 120° C.-200° C. and the internal pressure of the pressure vessel reaches 0.198 MPa-1.554 MPa. The passivation time of the heating and pressurizing is greater than 2 hours.

[0042] The beneficial effects of the above technical solution are:

[0043] The ultrapure water is made to cover the semi-finished product of the stainless steel temperature averaging plate 1. The semi-finished product of the stainless steel temperature averaging plate 1 does not come into contact with the air, thereby preventing the generation of Fe2O3 and FeO. At the same time, a large amount of water vapor bubbles will be generated in the water during the high-temperature boiling process. The water vapor bubbles are in direct contact with the stainless steel. Under the high-temperature and high-pressure environment, the iron in the stainless steel temperature averaging plate 1 reacts with the water vapor to generate Fe3O4. The passivation treatment effect of the stainless steel temperature averaging plate 1 in Example 2 is shown in Table 1:

[0044] Table 1 Aging performance data changes of stainless steel temperature equalizing plate in Example 2 of this solution

[0045]

[0046]

[0047] The passivation treatment effect of stainless steel temperature plate 1 in the current industry is shown in Table 2:

[0048] Table 2 Changes in aging performance data of stainless steel uniform temperature plate using traditional passivation method

[0049]

[0050]

[0051] The smaller the performance parameter after aging, the less attenuation there is in the performance, and the better the effect. From the comparison of Table 1 and Table 2, it can be seen that after the passivation treatment of the stainless steel temperature averaging plate 1 in Example 2, the performance of the stainless steel temperature averaging plate 1 is not attenuated, and the passivation effect is better.

[0052] Example 3

[0053] On the basis of Example 2, Figure 1 As shown, the isolation method of step 2 can also be to place the semi-finished stainless steel temperature plate 1 into a vacuum container, evacuate the vacuum container to make the internal pressure of the vacuum container less than 0.0025 MPa, and then inject ultrapure water into the vacuum container, with the amount of ultrapure water being less than 1 / 2000 of the capacity of the vacuum container;

[0054] The vacuum container is heated and pressurized so that the temperature of the ultrapure water is greater than 250° C. and the pressure is greater than 0.198 MPa. The passivation time of the heating and pressurizing is greater than 2 hours.

[0055] The beneficial effects of the above technical solution are:

[0056] The vacuum container has been evacuated to prevent the generation of Fe2O3 and FeO. At the same time, under high temperature and high pressure environment, the iron in the stainless steel temperature plate 1 reacts with water vapor to generate Fe3O4.

[0057] Example 4

[0058] On the basis of Example 3, Figure 2-Figure 4As shown, heaters 37 are symmetrically provided on the left and right sides of the lower end of the passivation container 2, a passivation chamber 3 is provided in the middle of the upper end of the passivation container 2, a cover plate 4 is rotatably provided on the upper end of the passivation chamber 3, and the left and right sides of the passivation chamber 3 are symmetrically connected with a water inlet 5 and an air duct 12, which are distributed up and down, and a water storage shell 6 is symmetrically provided on the left and right sides of the upper end of the passivation container 2, and a water storage chamber 7 is provided inside the water storage shell 6, and the water storage chamber 7 is connected to the passivation chamber 3 through the water inlet 5, and a return water port 8 is provided at the lower end of the passivation chamber 3, and the left and right sides of the return water port 8 are symmetrically connected with a water inlet channel 9, and the water inlet channel 9 is correspondingly connected to the water inlet pipe 38 through the switching chamber 11, and the water inlet pipe 38 is connected to the water storage chamber 7;

[0059] Support blocks 21 are symmetrically provided on the left and right sides of the lower end of the passivation chamber 3, and a number of guide wheels 22 are provided at the inclined end of the support block 21. The support block 21 is fixedly connected to the threaded sleeve 20, and the threaded sleeve 20 passes through the side end of the passivation chamber 3 and is threadedly connected to the threaded rod 15. The threaded rod 15 is fixedly connected to the motor 14, and the motor 14 is fixedly connected to the lower end of the water storage shell 6. The threaded rod 15 is fixedly connected to the bevel gear 16, and the bevel gear 16 is engaged with the bevel gear 2 17. The bevel gear 2 17 is fixedly connected to the threaded sleeve 2 18. The threaded sleeve 2 18 is rotatably set at the lower end of the water storage shell 6. The threaded sleeve 2 18 is threadedly connected to the threaded rod 2 19. The threaded rod 2 19 is fixedly connected to the lower end of the push plate 46, and the push plate 46 is slidably set in the water storage chamber 7.

[0060] The beneficial effects of the above technical solution are:

[0061] When the stainless steel temperature equalizing plate 1 is passivated, the stainless steel temperature equalizing plate 1 is placed in the passivation chamber 3. The cover plate 4 is provided to open and close the passivation chamber 3, so as to connect and isolate the passivation chamber 3 from the outside. The water storage chamber 7 is used to store ultrapure water. The water inlet 5 is used to introduce ultrapure water into the passivation chamber 3. The water return port 8 is used to recover the ultrapure water remaining in the water storage chamber 7 after the passivation treatment. The recovered ultrapure water enters the water storage chamber 7 through the water inlet channel 9, the switching chamber 11 and the water inlet pipe 38.

[0062] After the stainless steel temperature-averaging plate 1 is placed in the passivation chamber 3, the motor 14 is started, and the motor 14 drives the threaded rod 15 to rotate, and the threaded rod 15 drives the bevel gear 16 to rotate. The rotation of the threaded rod 15 causes the threaded sleeve 20 to move in the direction of approaching each other, and the threaded sleeve 20 drives the support block 21 to move in the direction of approaching each other, and the bevel gear 16 drives the bevel gear 2 17 to rotate. When the bevel gear 2 17 rotates, it drives the threaded sleeve 2 18 to rotate, and the threaded sleeve 2 18 drives the threaded rod 2 19 to move upward, and the threaded rod 2 19 drives the push plate 46 to slide upward along the water storage chamber 7, and the push plate 46 pushes the target amount of ultrapure water in the water storage chamber 7 through the water inlet 5 is pushed into the passivation chamber 3 so that the ultrapure water covers the stainless steel temperature averaging plate 1. Then, as the support block 21 continues to move, a number of guide wheels 22 are provided on the inclined end of the support block 21 to facilitate the upward movement of the stainless steel temperature averaging plate 1 along the inclined end of the support block 21, thereby lifting the stainless steel temperature averaging plate 1 so that the lower end of the stainless steel temperature averaging plate 1 is out of contact with the ultrapure water, thereby preventing the lower end of the stainless steel temperature averaging plate 1 from being attached to the lower end of the passivation chamber 3 and affecting the passivation treatment of the lower end of the stainless steel temperature averaging plate 1. Then, the heater 37 is operated so that the water vapor first contacts the lower end of the stainless steel temperature averaging plate 1, and the lower end of the stainless steel temperature averaging plate 1 is passivated.

[0063] After a certain period of passivation treatment, the control motor 14 works in the reverse direction, so that the push plate 46 slides downward along the water storage chamber 7 to return to its original position, which is convenient for subsequent ultrapure water to enter the water storage chamber 7 through the water inlet channel 9, the switching chamber 11 and the water inlet pipe 38, and it is also convenient to replenish ultrapure water into the water storage chamber 7. At the same time, it also makes the support block 21 move in the direction away from each other. At this time, the support block 21 releases the stainless steel temperature equalizing plate 1, and the stainless steel temperature equalizing plate 1 is re-immersed in ultrapure water. The water vapor bubbles contact the upper end and the left and right ends of the stainless steel temperature equalizing plate 1 for passivation treatment, thereby completing the all-round passivation treatment of the stainless steel temperature equalizing plate 1 and ensuring the protective effect of the passivation layer on the surface of the stainless steel temperature equalizing plate 1.

[0064] Example 5

[0065] On the basis of Example 3, Figure 2-Figure 4As shown, a sliding plate 24 is provided in the return water port 8, and the lower end of the sliding plate 24 is fixedly connected to the connecting block 25. The connecting block 25 passes through the upper end of the buffer shell 27 and enters the buffer cavity 28 and is fixedly connected to the sealing plate 26. The sealing plate 26 is slidably provided in the buffer cavity 28. The buffer shell 27 is provided at the lower end of the passivation container 2. A pressure relief port 29 is provided at the lower end of the buffer shell 27. A blocking block 30 is provided in the pressure relief port 29. The blocking block 30 is fixedly connected to the connecting plate 49. A plurality of springs 48 are fixedly provided between the connecting plate 49 and the lower end of the buffer shell 27. The left and right sides of the buffer cavity 28 are symmetrically connected with the air supply channel 13. The air supply channel 13 is connected to the switching cavity 11 is communicated with the air passage 12 correspondingly, a mounting block 31 is rotatably provided in the switching chamber 11, a switching tube 47 is installed on the mounting block 31, a communicating hole 32 is passed through the switching tube 47, a power pump is installed on the switching tube 47, the mounting block 31 is fixedly connected to the connecting shaft, the connecting shaft passes through the front end of the communicating hole 32 and is fixedly connected to the gear 36, the gear 36 is meshed with the rack 35, the rack 35 is fixedly connected to the connecting block 2 34, the connecting block 2 34 is provided with a matching hole 33 for the water inlet pipe 38 to pass through, the connecting block 2 34 is fixedly connected to the connecting block 3 23, the connecting block 3 23 passes through the side end of the passivation container 2 into the passivation chamber 3 and is fixedly connected to the support block 21;

[0066] A pillar 10 is provided at each top corner of the lower end of the passivation container 2. A maintenance port 39 is symmetrically provided on the left and right sides of the lower end of the passivation container 2. The maintenance port 39 is connected to the water inlet channel 9. A filter screen 40 is slidably provided in the maintenance port 39. The filter screen 40 is fixedly connected to the push block 1 41. The inclined end of the push block 1 41 is slidably connected to the inclined end of the push block 2 42. The push block 1 41 is slidably set in the maintenance port 39, and the push block 2 42 is slidably set in the sliding port 45. The sliding port 45 is connected to the maintenance port 39. A spring 2 43 is fixed between the push block 2 42 and the sliding port 45. The sliding port 45 is connected to the air supply channel 13 through the connecting port 44. The maintenance port 39 and the air supply channel 13 are distributed front and back.

[0067] The connecting block three 23 and the threaded sleeve one 20 are distributed front and back with the air passage 12 , and the sliding port 45 , the water inlet channel 9 and the air supply channel 13 are all arranged inside the passivation container 2 .

[0068] The beneficial effects of the above technical solution are:

[0069] The sliding plate 24 is used to block the return water port 8 to prevent the ultrapure water in the passivation chamber 3 from flowing into the return water port 8. In the initial state, that is, when the motor 14 is not working, the switching tube 47 is in a vertical state. At this time, the air supply channel 13 is connected to the air duct 12 through the connecting hole 32. The power pump works to extract the air in the passivation chamber 3 and send the extracted air into the buffer chamber 28 and the sliding port 45. If the air pressure in the buffer chamber 28 and the sliding port 45 is large enough, the air in the buffer chamber 28 pushes the block 30 to leave the pressure relief port 29, and the block 30 drives the connecting plate 49 to move, and the spring 48 pulls Extend, so that the air in the buffer chamber 28 is discharged through the pressure relief port 29, ensuring that the air pressure in the buffer chamber 28 and the sliding port 45 reaches a certain level and remains balanced. At this time, the air pressure in the buffer chamber 28 pushes the sealing plate 26, and the sealing plate 26 pushes the sliding plate 24 to block the return water port 8 through the connecting block 25, thereby preventing water vapor from entering the return water port 8 during the passivation process. The air pressure in the sliding port 45 pushes the push block 2 42, thereby preventing the ultrapure water from shaking the push block 2 42 left and right when passing through the filter screen 40, so that the ultrapure water is discharged from the maintenance port 39;

[0070] After the passivation treatment is completed, the control motor 14 works again, so that the support block 21 moves and can drive the connection block three 23 to move. The connection block three 23 drives the rack 35 to move through the connection block two 34. The rack 35 drives the gear 36 to rotate. The gear 36 drives the mounting block 31 to rotate through the connecting shaft. The mounting block 31 drives the switching tube 47 to rotate. After the support block 21 pushes up the stainless steel temperature equalizing plate 1 again, the switching tube 47 rotates to a horizontal state. At this time, the water inlet channel 9 is connected to the water inlet pipe 38 through the connecting hole 32. The power pump works, so that the sliding plate 24 drives the sealing plate 26 to slide along the buffer chamber 28 through the connection block 25. The ultrapure water in the passivation chamber 3 enters the return water port 8, and the pressure relief port 29 can discharge gas. When the recovered ultrapure water passes through the maintenance port 39, the push block two 42 is used to seal the maintenance port 39, and the ultrapure water will not be discharged from the maintenance port 39. The filter screen 40 in the opening 39 filters the metal waste on the stainless steel temperature equalizing plate 1 carried in the ultrapure water, and the filtered ultrapure water enters the water storage chamber 7 through the water inlet pipe 38 for recycling. After recycling, the control motor 14 works in the reverse direction to restore the push plate 46 to its original position, so that the ultrapure water can be replenished into the water storage chamber 7. At this time, the switching tube 47 rotates to the vertical state again, and after the cover plate 4 is opened, the passivation chamber 3 is connected to the outside, so that the air pressure in the sliding opening 45 and the buffer chamber 28 is the same as that in the outside, and the air pressure in the sliding opening 45 no longer pushes the push block 2 42. If too much waste and impurities are accumulated in the filter screen 40, the filter screen 40 drives the push block 1 41 downward under the action of gravity, and the push block 1 41 drives the push block 2 42 to move, and the push block 2 42 drives the spring 2 43 to be compressed. The filter screen 40 can be taken out through the maintenance opening 39 for cleaning and maintenance.

[0071] If stainless steel temperature-averaging plates 1 of different sizes are passivated, racks 35 of different tooth pitches are replaced so that the rotation angle of the gear 36 remains at ninety degrees when the moving distance of the support block 21 changes. A pressure relief valve can be set at the front or rear of the passivation container 2. The water vapor generated when the ultrapure water is heated will increase the air pressure value of the passivation chamber 3. The setting of the pressure relief valve ensures that the air pressure in the passivation chamber 3 remains within the target pressure range. A water replenishment port can be set at the upper end of the water storage shell 6 to replenish ultrapure water. The passivation container 2 is not a vacuum container, and the several structures connected thereto improve the automation of the passivation process, reduce the steps of manual operation and control, save time and effort, and improve the passivation effect of the stainless steel temperature-averaging plate 1.

[0072] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A passivation method for a stainless steel heat sink, characterized by: The following steps are involved: Step 1: Prepare a passivation container (2) and place the semi-finished stainless steel temperature plate (1) after laser edge sealing; Step 2: Add a certain amount of ultrapure water to the passivation container (2), and isolate the semi-finished product of the stainless steel temperature averaging plate (1) from the air; Step 3: heating and pressurizing the passivation container (2) for a certain period of time to form a Fe3O4 passivation layer on the surface of the semi-finished stainless steel temperature-averaging plate (1).

2. The passivation method for a stainless steel heat sink according to claim 1, characterized in that: The passivation container (2) includes any one of a pressure container and a vacuum container.

3. The passivation method for a stainless steel heat sink according to claim 2, characterized in that: The isolation method of step 2 is to place the semi-finished product of the stainless steel temperature-averaging plate (1) into a pressure vessel, and then inject ultrapure water into the pressure vessel so that the ultrapure water covers the stainless steel temperature-averaging plate (1).

4. The passivation method for a stainless steel heat sink according to claim 3, characterized in that: The pressure vessel is heated and pressurized so that the temperature of the ultrapure water reaches 120° C.-200° C. and the internal pressure of the pressure vessel reaches 0.198 MPa-1.554 MPa. The passivation time of the heating and pressurizing is greater than 2 hours.

5. The passivation method for a stainless steel heat sink according to claim 2, characterized in that: The isolation method of step 2 can also be to place the semi-finished product of the stainless steel temperature equalizing plate (1) into a vacuum container, evacuate the vacuum container so that the internal pressure of the vacuum container is less than 0.0025 MPa, and then inject ultrapure water into the vacuum container, wherein the amount of ultrapure water is less than 1 / 2000 of the capacity of the vacuum container.

6. The passivation method for a stainless steel heat sink according to claim 5, characterized in that: The vacuum container is heated and pressurized so that the temperature of the ultrapure water is greater than 250° C. and the pressure is greater than 0.198 MPa. The passivation time of the heating and pressurizing is greater than 2 hours.

7. The passivation method for a stainless steel heat sink according to claim 5, characterized in that: A heater (37) is symmetrically provided on the left and right sides of the lower end of the passivation container (2); a passivation chamber (3) is provided in the middle of the upper end of the passivation container (2); a cover plate (4) is rotatably provided on the upper end of the passivation chamber (3); a water inlet (5) and an air duct (12) are symmetrically connected on the left and right sides of the passivation chamber (3); the water inlet (5) and the air duct (12) are distributed up and down; a water storage shell (6) is symmetrically provided on the left and right sides of the upper end of the passivation container (2); a water storage chamber (7) is provided inside the water storage shell (6); the water storage chamber (7) is connected to the passivation chamber (3) through the water inlet (5); a water return port (8) is provided at the lower end of the passivation chamber (3); a water inlet channel (9) is symmetrically connected to the left and right sides of the return port (8); the water inlet channel (9) is correspondingly connected to the water inlet pipe (38) through the switching chamber (11); and the water inlet pipe (38) is connected to the water storage chamber (7).

8. The passivation method for a stainless steel heat sink according to claim 7, characterized in that: The lower end of the passivation chamber (3) is symmetrically provided with support blocks (21) on both sides. The inclined end of the support block (21) is provided with a plurality of guide wheels (22). The support block (21) is fixedly connected to the threaded sleeve (20). The threaded sleeve (20) passes through the side end of the passivation chamber (3) and is threadedly connected to the threaded rod (15). The threaded rod (15) is fixedly connected to the motor (14). The motor (14) is fixedly connected to the lower end of the water storage shell (6). The threaded rod (15) is fixedly connected to the bevel gear (16). The bevel gear (16) is meshed with the bevel gear (17). The bevel gear (17) is fixedly connected to the threaded sleeve (18). The threaded sleeve (18) is rotatably arranged at the lower end of the water storage shell (6). The threaded sleeve (18) is threadedly connected to the threaded rod (19). The threaded rod (19) is fixedly connected to the lower end of the push plate (46). The push plate (46) is slidably arranged in the water storage chamber (7).

9. The passivation method for a stainless steel heat sink according to claim 7, characterized in that: A sliding plate (24) is provided in the water return port (8) for sliding movement. The lower end of the sliding plate (24) is fixedly connected to the connecting block (25). The connecting block (25) penetrates the upper end of the buffer shell (27) into the buffer cavity (28) and is fixedly connected to the sealing plate (26). The sealing plate (26) is provided in the buffer cavity (28) for sliding movement. The buffer shell (27) is provided at the lower end of the passivation container (2). A pressure relief port (29) is provided at the lower end of the buffer shell (27). A blocking block (30) is provided in the pressure relief port (29). The blocking block (30) is fixedly connected to the connecting plate (49). A plurality of springs (48) are fixedly provided between the connecting plate (49) and the lower end of the buffer shell (27). The left and right sides of the buffer cavity (28) are symmetrically connected to the air supply channel (13). The air supply channel (13) is connected to the switching cavity (11). ) is correspondingly connected to the air passage (12), a mounting block (31) is rotatably provided in the switching chamber (11), a switching tube (47) is installed on the mounting block (31), a connecting hole (32) is provided through the switching tube (47), a power pump is installed on the switching tube (47), the mounting block (31) is fixedly connected to the connecting shaft, the connecting shaft passes through the front end of the connecting hole (32) and is fixedly connected to the gear (36), the gear (36) is meshed with the rack (35), the rack (35) is fixedly connected to the second connecting block (34), the second connecting block (34) is provided with a matching hole (33) for the water inlet pipe (38) to pass through, the second connecting block (34) is fixedly connected to the third connecting block (23), the third connecting block (23) passes through the side end of the passivation container (2) into the passivation chamber (3) and is fixedly connected to the support block (21).

10. The passivation method for a stainless steel heat sink according to claim 9, characterized in that: A pillar (10) is provided at each corner of the lower end of the passivation container (2). A maintenance port (39) is symmetrically provided on the left and right sides of the lower end of the passivation container (2). The maintenance port (39) is communicated with the water inlet channel (9). A filter screen (40) is slidably provided in the maintenance port (39). The filter screen (40) is fixedly connected to a first push block (41). The inclined end of the first push block (41) is slidably connected to the inclined end of the second push block (42). The first push block (41) is slidably provided in the maintenance port (39). The second push block (42) is slidably provided in the sliding port (45). The sliding port (45) is communicated with the maintenance port (38). A second spring (43) is fixedly provided between the second push block (42) and the sliding port (45). The sliding port (45) is communicated with the air supply channel (13) through a communication port (44). The maintenance port (39) and the air supply channel (13) are distributed front and back.

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