Remedial methods for high hydrogen content in elastic parts after electroplating passivation

Abstract

The present invention belongs to the technology of surface treatment and dehydrogenation, and relates to a remedial method for elastic parts with high hydrogen content after electroplating passivation. The present invention uses paraffin liquid to treat elastic parts with high hydrogen content after electroplating passivation. After the paraffin liquid is heated, kept warm, cooled and other treatments are performed, the problem of remedial dehydrogenation of elastic parts with high hydrogen content after electroplating passivation and parts that cannot be used normally is solved. The color of the passivation film after the remedial dehydrogenation treatment is basically unchanged, and the performance of the passivation film is not damaged; the present invention has a short production cycle and simple operation, low process cost, can be recycled and used many times, and can be used in large areas in zinc plating, cadmium plating and other plating types.

Description

Technical Field

[0001] The invention belongs to the surface treatment dehydrogenation technology, and relates to a remedial method for elastic parts with high hydrogen content after electroplating passivation. Background Art

[0002] At present, in order to prevent hydrogen embrittlement during electroplating of elastic parts, dehydrogenation treatment is generally required. Although dehydrogenation treatment is carried out according to the process regulations, hydrogen embrittlement and fracture may still occur during subsequent use of the parts.

[0003] Traditional process parts go through the following processes:

[0004] Acceptance-degreasing-hot water washing-cold water washing-mild corrosion-cold water washing-dust removal-cold water washing-neutralization-cold water washing-electroplating-cold water washing-hot water washing-drying-dehydrogenation-cold water washing-brightening-cold water washing-passivation-cold water washing-cold water washing-hot water washing-drying-inspection

[0005] When elastic parts are electroplated, only dehydrogenation treatment is carried out according to the requirements of the process regulations, and then photochemical and passivation treatments are carried out. Therefore, when hydrogen embrittlement and fracture are found in the elastic parts during use, remedial treatment methods are sought.

[0006] When the elastic parts are electroplated, the dehydrogenation treatment is only carried out according to the process regulations, and the dehydrogenation effect is not tested. When hydrogen embrittlement fracture is found during use, remedial treatment is carried out. The general remedial treatment method is to bake in an oven, but the dehydrogenation effect of the plated parts is best only within 1-2 hours after plating, and the effect is very small after more than 2 hours. In addition, the passivation film will gradually oxidize and discolor when it exceeds 140℃. When it exceeds 180℃, the passivation film will turn gray-brown, and the protective performance of the passivation film will also be greatly reduced. Summary of the invention

[0007] The purpose of the present invention is to solve the problem of remedial dehydrogenation of elastic parts which have high hydrogen content after electroplating passivation and cannot be used normally.

[0008] The technical solution of the present invention is a remedial method for high hydrogen content of elastic parts after electroplating passivation, comprising the following steps:

[0009] Step 1. The melted paraffin liquid is pre-treated by placing the paraffin in a stainless steel tank and adjusting the temperature to 100°C. When the paraffin is melted into paraffin liquid, keep it at 100°C for 15-20 minutes, then heat it to 130-140°C and keep it for 3-5 minutes, filter out the precipitate, and cool it naturally for later use;

[0010] Step 2. Remedial dehydrogenation: Heat the treated paraffin to 170-180℃ and keep it warm for 3-5 minutes, hang the parts on the hanger and place them in the 170-180℃ paraffin liquid for 3-5 seconds, and observe the amount of bubbles in the parts;

[0011] Step 3. Remediate the post-treatment of hydrogen removal and observe the amount of bubbles in the parts. The standard is to see 3-5 bubbles sparsely and slowly appear or no bubbles appear. Take out the parts and let them cool naturally for 15-20 minutes. Then hang the parts on the hanger and place them in 170-180℃ paraffin liquid for 3-5 seconds. Observe the amount of bubbles in the parts. When the amount of bubbles reaches 3-5 bubbles sparsely and slowly appear or no bubbles appear, repeat at least 2-3 times.

[0012] Step 4: Wax dripping treatment.

[0013] In step 1, the volume of the paraffin liquid reaches 70-80% of the volume of the stainless steel tank.

[0014] The method for filtering out the precipitate in step 1 is as follows: taking out the upper transparent liquid, placing the taken out paraffin liquid at 80-90° C., and filtering out the precipitate or coarse particles in the paraffin liquid with a 150-200 mesh stainless steel filter.

[0015] The stainless steel filter screen has a mesh size of 150-200.

[0016] The paraffin wax is industrial block paraffin wax.

[0017] The material of the hanger is stainless steel.

[0018] The wax dripping treatment in step 4 is to place the hanger with the parts in a wax dripping box at 90-100° C. for 20-30 minutes.

[0019] The wax dripping box can be temperature-controlled at 0-100°C.

[0020] Beneficial effects of the present invention: The present invention uses paraffin liquid to treat elastic parts with high hydrogen content after electroplating passivation. After the paraffin liquid is heated, kept warm, cooled, etc., the problem of remedial dehydrogenation of elastic parts with high hydrogen content after electroplating passivation and parts that cannot be used normally is solved. The color of the passivation film after remedial dehydrogenation treatment basically does not change, and the performance of the passivation film is not damaged; the present invention has a short production cycle and simple operation, low process cost, can be recycled and used multiple times, and can be used in large-scale plating such as zinc plating and cadmium plating. DETAILED DESCRIPTION

[0021] The present invention is further described below in conjunction with specific embodiments:

[0022] The first step is to prepare for hydrogen removal;

[0023] The tools and materials required include a stainless steel tank (heated and temperature controlled at 0-200°C), a thermometer (0-200°C), industrial block paraffin, a stainless steel hanger, and a wax dripping box (heated and temperature controlled at 0-100°C).

[0024] Select a stainless steel tank and an appropriate amount of paraffin wax according to the size of the test parts. In principle, the parts should be completely immersed in the molten paraffin liquid. Generally, the volume of the molten paraffin liquid should be 70-80% of the volume of the stainless steel tank.

[0025] The first step is to remedy the high hydrogen content of elastic parts after electroplating passivation, including the following steps:

[0026] Step 1. The melted paraffin liquid is pre-treated by placing the paraffin in a stainless steel tank and adjusting the temperature to 100°C. When the paraffin is melted into paraffin liquid and the volume of the paraffin liquid reaches 70-80% of the volume of the stainless steel tank, keep it at 100°C for 15-20 minutes, then heat it to 130-140°C and keep it for 3-5 minutes, filter out the precipitate, and cool it naturally for use; (mainly to remove water vapor and other gases in the paraffin to avoid rusting of the test parts.) Method for filtering out the precipitate: take out the upper transparent liquid, and then place the taken out paraffin liquid at 80-90°C, and use a 150-200 mesh stainless steel filter to filter out the precipitate or coarse particles in the paraffin liquid.

[0027] Step 2. Remedial dehydrogenation: Heat the treated paraffin to 170-180℃ and keep it warm for 3-5 minutes, hang the parts on a stainless steel hanger and place them in the 170-180℃ paraffin liquid for 3-5 seconds, and observe the amount of bubbles in the parts;

[0028] Step 3. Remediate the post-treatment of hydrogen removal, observe the amount of bubbles in the parts, the standard is to reach 3-5 bubbles sparsely and slowly or no bubbles, take out the parts and cool them naturally for 15-20 minutes, then hang the parts on a stainless steel hanger and place them in 170-180℃ paraffin liquid for 3-5 seconds, observe the amount of bubbles in the parts, when the amount of bubbles reaches 3-5 bubbles sparsely and slowly or no bubbles, repeat at least 2-3 times;

[0029] Step 4. Wax dripping treatment: Place the stainless steel hanger with the parts in the wax dripping box, 90-100℃, keep warm for 20-30 minutes.

[0030] Example 1: A T10 material spring is plated with 5-8 um cadmium and then passivated and dehydrogenated.

[0031] The first step is to prepare for hydrogen removal;

[0032] The tools and materials required include a stainless steel tank (heated and temperature controlled at 0-200°C), a thermometer (0-200°C), industrial block paraffin, a stainless steel hanger, and a wax dripping box (heated and temperature controlled at 0-100°C).

[0033] Select a stainless steel tank and an appropriate amount of paraffin wax according to the size of the test parts. In principle, the parts should be completely immersed in the molten paraffin liquid. Generally, the volume of the molten paraffin liquid should be 70% of the volume of the stainless steel tank.

[0034] The first step is to remedy the high hydrogen content of elastic parts after electroplating passivation, including the following steps:

[0035] Step 1. Pre-treat the melted paraffin liquid by placing the paraffin in a stainless steel tank and adjusting the temperature to 100°C. When the paraffin is melted into paraffin liquid and the volume of the paraffin liquid reaches 70% of the volume of the stainless steel tank, keep it at 100°C for 15 minutes, then heat it to 130°C and keep it for 3 minutes, filter out the precipitate, and cool it naturally for use; (mainly to remove water vapor and other gases in the paraffin to avoid rusting of the test parts.) Method for filtering out the precipitate: take out the upper transparent liquid, then place the taken out paraffin liquid at 80°C, and use a 150-mesh stainless steel filter to filter out the precipitate or coarse particles in the paraffin liquid.

[0036] Step 2. Remedial dehydrogenation: Heat the treated paraffin to 170°C and keep it warm for 3 minutes, hang the spring on a stainless steel hanger and place it in 170°C paraffin liquid for 3 seconds, and observe the amount of bubbles in the parts;

[0037] Step 3. Remediate the post-treatment of hydrogen removal and observe the amount of bubbles in the parts. The standard is to see 3-5 bubbles sparsely and slowly emerge or no bubbles emerge. Take out the parts and let them cool naturally for 15 minutes. Then hang the parts on a stainless steel hanger and place them in 170℃ paraffin liquid for 3 seconds. Observe the amount of bubbles in the parts. When the amount of bubbles reaches 3-5 bubbles sparsely and slowly emerge or no bubbles emerge, repeat at least 2 times.

[0038] Step 4. Wax dripping treatment: Place the stainless steel hanger with the parts in the wax dripping box at 90℃ for 20 minutes.

[0039] Example 2: After passivation, a T10 material spring is plated with 5-8um cadmium and then dehydrogenated.

[0040] The first step is to prepare for hydrogen removal;

[0041] The tools and materials required include a stainless steel tank (heated and temperature controlled at 0-200°C), a thermometer (0-200°C), industrial block paraffin, a stainless steel hanger, and a wax dripping box (heated and temperature controlled at 0-100°C).

[0042] Select a stainless steel tank and an appropriate amount of paraffin wax according to the size of the test parts. In principle, the parts should be completely immersed in the molten paraffin liquid. Generally, the volume of the molten paraffin liquid should be 80% of the volume of the stainless steel tank.

[0043] The first step is to remedy the high hydrogen content of elastic parts after electroplating passivation, including the following steps:

[0044] Step 1. Pre-treat the melted paraffin liquid by placing the paraffin in a stainless steel tank and adjusting the temperature to 100°C. When the paraffin is melted into paraffin liquid and the volume of the paraffin liquid reaches 80% of the volume of the stainless steel tank, keep it at 100°C for 20 minutes, then heat it to 140°C and keep it for 5 minutes, filter out the precipitate, and cool it naturally for use; (mainly to remove water vapor and other gases in the paraffin to avoid rusting of the test parts.) Method for filtering out the precipitate: take out the upper transparent liquid, then place the taken out paraffin liquid at 90°C, and use a 200-mesh stainless steel filter to filter out the precipitate or coarse particles in the paraffin liquid.

[0045] Step 2. Remedial dehydrogenation: Heat the treated paraffin to 180°C and keep it warm for 5 minutes, hang the parts on a stainless steel hanger and place them in the 180°C paraffin liquid for 5 seconds, and observe the amount of bubbles in the parts;

[0046] Step 3. Remediate the post-treatment of hydrogen removal and observe the amount of bubbles in the parts. The standard is to see 3-5 bubbles sparsely and slowly emerge or no bubbles emerge. Take out the parts and let them cool naturally for 20 minutes. Then hang the parts on a stainless steel hanger and place them in 180℃ paraffin liquid for 5 seconds. Observe the amount of bubbles in the parts. When the amount of bubbles reaches 3-5 bubbles sparsely and slowly emerge or no bubbles emerge, repeat at least 3 times.

[0047] Step 4. Wax dripping treatment: Place the stainless steel hanger with the parts in the wax dripping box at 100℃ for 30 minutes.

[0048] Example 3: The elastic shaft of 30CrMnSiA material is galvanized to 8-12um and then passivated and then dehydrogenated.

[0049] The first step is to prepare for hydrogen removal;

[0050] The tools and materials required include a stainless steel tank (heated and temperature controlled at 0-200°C), a thermometer (0-200°C), industrial block paraffin, a stainless steel hanger, and a wax dripping box (heated and temperature controlled at 0-100°C).

[0051] Select a stainless steel tank and an appropriate amount of paraffin wax according to the size of the test parts. In principle, the parts should be completely immersed in the molten paraffin liquid. Generally, the volume of the molten paraffin liquid should be 70% of the volume of the stainless steel tank.

[0052] The first step is to remedy the high hydrogen content of elastic parts after electroplating passivation, including the following steps:

[0053] Step 1. Pre-treat the melted paraffin liquid by placing the paraffin in a stainless steel tank and adjusting the temperature to 100°C. When the paraffin is melted into paraffin liquid and the volume of the paraffin liquid reaches 70% of the volume of the stainless steel tank, keep it at 100°C for 15 minutes, then heat it to 130°C and keep it for 3 minutes, filter out the precipitate, and cool it naturally for use; (mainly to remove water vapor and other gases in the paraffin to avoid rusting of the test parts.) Method for filtering out the precipitate: take out the upper transparent liquid, then place the taken out paraffin liquid at 80°C, and use a 150-mesh stainless steel filter to filter out the precipitate or coarse particles in the paraffin liquid.

[0054] Step 2. Remedial dehydrogenation: Heat the treated paraffin to 170°C and keep it warm for 3 minutes, hang the elastic shaft on a stainless steel hanger and place it partially in the 170°C paraffin liquid for 3 seconds, and observe the amount of bubbles in the parts;

[0055] Step 3. Remediate the post-treatment of hydrogen removal and observe the amount of bubbles in the parts. The standard is to see 3-5 bubbles sparsely and slowly emerge or no bubbles emerge. Take out the parts and let them cool naturally for 15 minutes. Then hang the parts on a stainless steel hanger and place them in 170℃ paraffin liquid for 3 seconds. Observe the amount of bubbles in the parts. When the amount of bubbles reaches 3-5 bubbles sparsely and slowly emerge or no bubbles emerge, repeat at least 2 times.

[0056] Step 4. Wax dripping treatment: Place the stainless steel hanger with the parts in the wax dripping box at 90℃ for 20 minutes.

[0057] Example 4: A 30CrMnSiA elastic shaft is galvanized to 8-12um and then passivated and then dehydrogenated.

[0058] The first step is to prepare for hydrogen removal;

[0059] The tools and materials required include a stainless steel tank (heated and temperature controlled at 0-200°C), a thermometer (0-200°C), industrial block paraffin, a stainless steel hanger, and a wax dripping box (heated and temperature controlled at 0-100°C).

[0060] Select a stainless steel tank and an appropriate amount of paraffin wax according to the size of the test parts. In principle, the parts should be completely immersed in the molten paraffin liquid. Generally, the volume of the molten paraffin liquid should be 80% of the volume of the stainless steel tank.

[0061] The first step is to remedy the high hydrogen content of elastic parts after electroplating passivation, including the following steps:

[0062] Step 1. Pre-treat the melted paraffin liquid by placing the paraffin in a stainless steel tank and adjusting the temperature to 100°C. When the paraffin is melted into paraffin liquid and the volume of the paraffin liquid reaches 80% of the volume of the stainless steel tank, keep it at 100°C for 20 minutes, then heat it to 140°C and keep it for 5 minutes, filter out the precipitate, and cool it naturally for use; (mainly to remove water vapor and other gases in the paraffin to avoid rusting of the test parts.) Method for filtering out the precipitate: take out the upper transparent liquid, then place the taken out paraffin liquid at 90°C, and use a 200-mesh stainless steel filter to filter out the precipitate or coarse particles in the paraffin liquid.

[0063] Step 2. Remedial dehydrogenation: Heat the treated paraffin to 180°C and keep it warm for 5 minutes, hang the elastic shaft on a stainless steel hanger and place it partially in the 180°C paraffin liquid for 5 seconds, and observe the amount of bubbles in the parts;

[0064] Step 3. Remediate the post-treatment of hydrogen removal and observe the amount of bubbles in the parts. The standard is to see 3-5 bubbles sparsely and slowly emerge or no bubbles emerge. Take out the parts and let them cool naturally for 20 minutes. Then hang the parts on a stainless steel hanger and place them in 180℃ paraffin liquid for 5 seconds. Observe the amount of bubbles in the parts. When the amount of bubbles reaches 3-5 bubbles sparsely and slowly emerge or no bubbles emerge, repeat at least 3 times.

[0065] Step 4. Wax dripping treatment: Place the stainless steel hanger with the parts in the wax dripping box at 100℃ for 30 minutes.

Claims

1. A remedial method for high hydrogen content in elastic parts after electroplating passivation, characterized in that: The following steps are involved: Step 1. The melted paraffin liquid is pre-treated by placing the paraffin in a stainless steel tank and adjusting the temperature to 100°C. When the paraffin is melted into paraffin liquid, keep it at 100°C for 15-20 minutes, then heat it to 130-140°C and keep it for 3-5 minutes, filter out the precipitate, and cool it naturally for later use; Step 2. Remedial dehydrogenation: Heat the treated paraffin to 170-180℃ and keep it warm for 3-5 minutes, hang the parts on the hanger and place them in the 170-180℃ paraffin liquid for 3-5 seconds, and observe the amount of bubbles in the parts; Step 3. Remediate the post-treatment of hydrogen removal and observe the amount of bubbles in the parts. The standard is to see 3-5 bubbles sparsely and slowly appear or no bubbles appear. Take out the parts and let them cool naturally for 15-20 minutes. Then hang the parts on the hanger and place them in 170-180℃ paraffin liquid for 3-5 seconds. Observe the amount of bubbles in the parts. When the amount of bubbles reaches 3-5 bubbles sparsely and slowly appear or no bubbles appear, repeat at least 2-3 times. Step 4. Wax dripping treatment: Place the hanger with the parts in the wax dripping box, 90-100℃, keep warm for 20-30 minutes.

2. The remedial method for high hydrogen content in elastic parts after electroplating passivation according to claim 1, characterized in that: In step 1, the volume of the paraffin liquid reaches 70-80% of the volume of the stainless steel tank.

3. The remedial method for high hydrogen content in elastic parts after electroplating passivation according to claim 1, characterized in that: The method for filtering out the precipitate in step 1 is as follows: taking out the upper transparent liquid, placing the taken out paraffin liquid at 80-90° C., and filtering out the precipitate or coarse particles in the paraffin liquid with a stainless steel filter.

4. The remedial method for high hydrogen content in elastic parts after electroplating passivation as claimed in claim 3, characterized in that: The stainless steel filter screen has a mesh size of 150-200.

5. The remedial method for high hydrogen content in elastic parts after electroplating passivation according to claim 1, characterized in that: The paraffin wax is industrial block paraffin wax.

6. The remedial method for high hydrogen content in elastic parts after electroplating passivation according to claim 1, characterized in that: The material of the hanger is stainless steel.

7. The remedial method for high hydrogen content in elastic parts after electroplating passivation according to claim 1, characterized in that: The wax dripping box has a temperature control range of 0-100°C.