Surface galvanizing rust-proof and corrosion-resistant treatment process for SAE flange machining

Abstract

The invention discloses a surface galvanization rust-proof and corrosion-resistant treatment process for SAE flange machining, and relates to the technical field of galvanization processes, and the surface galvanization rust-proof and corrosion-resistant treatment process specifically comprises the following treatment steps that firstly, an SAE flange is subjected to heat treatment; 2, under sufficient stirring, a purifying agent is slowly added into the plating solution, stirring reaction is conducted for 25-35 min, then stopping is conducted for 10-20 min, stirring continues to be conducted for 20-30 min, standing is conducted for 3.5-4 h, then the plating solution is filtered, and the plating solution is adjusted; thirdly, the SAE flange is immersed in a plating solution in a hot-dip plating tank for galvanization treatment, and the SAE flange is fished out and washed after galvanization is completed; fourthly, the SAE flange obtained after zinc plating is completed is placed in confining liquid to be subjected to dip coating, and redundant confining liquid on the workpiece is removed; and fifthly, baking treatment is carried out after blow-drying, and zinc-plating rust-proof and corrosion-resistant treatment on the surface of the SAE flange is completed. According to the surface galvanizing rust-proof and corrosion-resistant treatment process for SAE flange machining, the SAE flange is firstly subjected to heat treatment, so that the structure of the SAE flange is homogenized, machining stress is eliminated, a good foundation is laid for follow-up treatment, and the comprehensive mechanical property is improved.

Description

Technical Field

[0001] The invention relates to the technical field of galvanizing technology, in particular to a surface galvanizing anti-rust and corrosion treatment process for SAE flange processing. Background Art

[0002] Hot-dip galvanizing is one of the most effective means to delay environmental corrosion of steel materials. It involves immersing the cleaned and activated steel products in molten zinc liquid, and coating the surface of the steel products with a zinc alloy coating with good adhesion through the reaction and diffusion between iron and zinc. Compared with other metal protection methods, the hot-dip galvanizing process has incomparable advantages in the protective characteristics of the combination of the physical barrier and electrochemical protection of the coating, the bonding strength between the coating and the substrate, the density, durability, maintenance-freeness and economy of the coating, and its adaptability to the shape and size of the product. The hot-dip galvanizing process is widely used in the fields of automobiles, construction, home appliances, chemicals, machinery, petroleum, metallurgy, light industry, transportation, electricity, aviation and marine engineering.

[0003] In the existing galvanizing process, the workpiece to be galvanized is mostly directly immersed in the galvanizing solution, which results in that the quality of the galvanizing solution and the workpiece itself will have a certain impact on the coating, especially when the galvanizing solution is not treated after use; therefore, the present invention provides a surface galvanizing anti-rust and corrosion treatment process for SAE flange processing to solve the above-mentioned problems. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a surface galvanizing anti-rust and corrosion treatment process for SAE flange processing, which solves the problems mentioned in the above background technology.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a surface galvanizing anti-rust and corrosion treatment process for SAE flange processing, specifically comprising the following processing steps: Step 1: Heat treat the SAE flange; Step 2: slowly add a purifier to the plating solution under full stirring, stir and react for 25-35 minutes, stop for 10-20 minutes, continue stirring for 20-30 minutes, and then let it stand for 3.5-4 hours, filter the plating solution, and adjust the plating solution; the purifier includes the following components by weight: 75-80 parts of aluminum powder, 12-17 parts of zinc powder, 1-3 parts of sodium thiosulfate, 4-7 parts of potassium sodium tartrate, and 1-2 parts of sodium alginate; Step 3: Immerse the SAE flange in the plating solution in the hot dip tank for galvanizing, and remove it from the hot dip tank for washing after galvanizing. Step 4: After the galvanizing is completed, the SAE flange is dipped in a sealing liquid, and the excess sealing liquid on the workpiece is removed; the sealing liquid comprises the following components in parts by weight: 1-5 parts of acrylic polyurethane, 0.5-1 parts of KH560, 6-14 parts of zinc oxide, 20-50 parts of water-soluble alcohol, 10-18 parts of epoxy vinyl resin, 5-10 parts of polytetrafluoroethylene, and 0.2-0.8 parts of hydrogen peroxide; Step 5: Bake after drying to complete the galvanized anti-rust and corrosion treatment on the surface of the SAE flange.

[0006] Preferably, the specific operation steps in step 1 are: Heat the SAE flange to 740-760℃, keep it warm for 120-130s, then cool it down to 620-650℃ at a rate of 5-10℃ / s, then cool it down to 250℃, 200℃, and 150℃ in sequence at a rate of 25-30℃ / s, then reheat it to 440-460℃ at a heating rate of 40-50℃ / s, keep it warm for 5-8s, and finally cool it to room temperature at a rate of 15-20℃ / s.

[0007] Preferably, when the temperature is lowered to 250°C, the temperature is kept for 40-50 seconds; when the temperature is lowered to 200°C, the temperature is kept for 20-30 seconds; when the temperature is lowered to 150°C, the temperature is kept for 10-15 seconds.

[0008] Preferably, in step 2, the amount of the purifier added is 8%-10% by weight of the zinc plating solution.

[0009] Preferably, the purifier is a mixture of 770 g aluminum powder, 150 g zinc powder, 20 g sodium thiosulfate, 50 g potassium sodium tartrate and 10 g sodium alginate.

[0010] Preferably, in step three, the galvanizing temperature is 450-480° C., and the galvanizing time is 30-40 seconds.

[0011] Preferably, the water-soluble alcohol in step 4 is selected from one or more of ethanol, methanol, propanol or butanol; the propanol is selected from one or both of n-propanol and isopropanol; the butanol is selected from one or more of n-butanol, isobutanol and tert-butanol.

[0012] Preferably, in step five, the baking temperature is 135-150° C., and the baking time is 10-15 minutes.

[0013] The present invention provides a surface galvanizing anti-rust and anti-corrosion treatment process for SAE flange processing. Compared with the prior art, it has the following beneficial effects: (1) The surface galvanizing anti-rust and corrosion treatment process for SAE flange processing, by first heat treating the SAE flange, the organization of the SAE flange is homogenized, the processing stress is eliminated, a good foundation is laid for subsequent processing, and the comprehensive mechanical properties are improved; and cooling treatment is performed at different rates to form a specific pearlite or bainite organization, improve strength and toughness, and at the same time refine the grains, improve the hardness, wear resistance and fatigue resistance of the material; through heat preservation treatment, the organization transformation can be more complete, and the stability of material performance can be improved; the uniformity of the flange surface temperature is effectively improved, which is conducive to the uniform adhesion of zinc liquid during galvanizing, and the defects such as missed plating and zinc nodules are reduced. At the same time, the oxide film on the flange surface can be formed evenly, which is conducive to better bonding between the zinc liquid and the base metal and improving the bonding strength.

[0014] (2) The surface galvanizing anti-rust and corrosion treatment process for SAE flange processing removes heavy metal ion impurities such as iron ions and copper ions in the plating solution by adding a purifier, thereby improving the purity of the plating solution, preventing impurities from affecting the quality of the zinc plating layer, and avoiding problems such as roughness and grayness of the plating layer; at the same time, it can reduce the high-valent metal ions that may exist in the plating solution to low-valent states or metal elements, which are convenient for precipitation or removal by adsorption by other substances, and can also remove dissolved oxygen in the plating solution, reducing the adverse effects of oxidation reactions on the plating solution and the plating layer; making the plating solution performance better, facilitating the uniform reduction and deposition of zinc ions on the surface of the workpiece, obtaining a plating layer with uniform thickness and good appearance, reducing the porosity and defects of the plating layer, and improving the protective performance and decorative performance of the plating layer; and can refine the grains of the zinc plating layer, making the plating layer denser and smoother, and improving the corrosion resistance and wear resistance of the plating layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a surface SEM image provided by a surface galvanizing anti-rust and corrosion treatment process for SAE flange processing of the present invention. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] Example 1 A surface galvanizing anti-rust and corrosion treatment process for SAE flange processing, specifically comprising the following processing steps: Step 1: Heat treat the SAE flange. The specific steps are as follows: Heat the SAE flange to 740℃, keep it warm for 120s, then cool it down to 620℃ at a rate of 5℃ / s, then cool it down to 250℃, 200℃, and 150℃ at a rate of 25℃ / s. When cooling to 250℃, keep it warm for 40s; when cooling to 200℃, keep it warm for 20s; when cooling to 150℃, keep it warm for 10s; then reheat it to 440℃ at a heating rate of 40℃ / s, keep it warm for 5s, and finally cool it to room temperature at a rate of 15℃ / s. Step 2: Slowly add 8% of the purifier to the plating solution under sufficient stirring, stir and react for 25 minutes, stop for 10 minutes, continue stirring for 20 minutes, and then let it stand for 3.5 hours, filter the plating solution, and adjust the plating solution; The purifier is a mixture of 770g aluminum powder, 150g zinc powder, 20g sodium thiosulfate, 50g potassium sodium tartrate and 10g sodium alginate; wherein the particle size of the aluminum powder is 200 mesh; Step 3: Immerse the SAE flange in the plating solution in the hot dip tank for galvanizing. The galvanizing temperature is 450°C and the galvanizing time is 30 seconds. After the galvanizing is completed, remove it and wash it with water; Step 4: After the galvanizing is completed, the SAE flange is dipped in the sealing liquid, and the excess sealing liquid on the workpiece is removed; The sealing solution includes the following components in parts by weight: 1 g of acrylic polyurethane, 0.5 g of KH560, 6 g of zinc oxide, 20 g of ethanol, 10 g of epoxy vinyl resin, 5 g of polytetrafluoroethylene, and 0.2 g of hydrogen peroxide; Step 5: Bake after drying at a temperature of 135°C for 10 minutes to complete the galvanized anti-rust and corrosion treatment on the surface of the SAE flange.

[0018] Example 2 A surface galvanizing anti-rust and corrosion treatment process for SAE flange processing, specifically comprising the following processing steps: Step 1: Heat treat the SAE flange. The specific steps are as follows: Heat the SAE flange to 750℃, keep it warm for 125s, then cool it down to 630℃ at a rate of 8℃ / s, then cool it down to 250℃, 200℃, and 150℃ at a rate of 30℃ / s. When cooling to 250℃, keep it warm for 45s; when cooling to 200℃, keep it warm for 25s; when cooling to 150℃, keep it warm for 12s; then reheat it to 450℃ at a heating rate of 45℃ / s, keep it warm for 6s, and finally cool it to room temperature at a rate of 20℃ / s. Step 2: Slowly add 9% of the purifier to the plating solution under sufficient stirring, stir and react for 30 minutes, stop for 15 minutes, continue stirring for 25 minutes, and then let it stand for 3.6 hours, filter the plating solution, and adjust the plating solution; The purifier is a mixture of 770g aluminum powder, 150g zinc powder, 20g sodium thiosulfate, 50g potassium sodium tartrate and 10g sodium alginate; wherein the aluminum powder has a particle size of 240 mesh; Step 3: Immerse the SAE flange in the plating solution in the hot dip tank for galvanizing. The galvanizing temperature is 460°C and the galvanizing time is 35 seconds. After the galvanizing is completed, remove it from the hot dip tank and wash it with water. Step 4: After the galvanizing is completed, the SAE flange is dipped in the sealing liquid, and the excess sealing liquid on the workpiece is removed; The sealing liquid includes the following components in parts by weight: 2 g acrylic polyurethane, 0.7 g KH560, 10 g zinc oxide, 30 g ethanol, 12 g epoxy vinyl resin, 7 g polytetrafluoroethylene, and 0.5 g hydrogen peroxide; Step 5: Bake after drying at a temperature of 140°C for 13 minutes to complete the galvanized anti-rust and corrosion treatment on the surface of the SAE flange.

[0019] Example 3 A surface galvanizing anti-rust and corrosion treatment process for SAE flange processing, specifically comprising the following processing steps: Step 1: Heat treat the SAE flange. The specific steps are as follows: Heat the SAE flange to 760℃, keep it warm for 125s, then cool it down to 640℃ at a rate of 8℃ / s, then cool it down to 250℃, 200℃, and 150℃ at a rate of 25℃ / s. When cooling to 250℃, keep it warm for 45s; when cooling to 200℃, keep it warm for 25s; when cooling to 150℃, keep it warm for 12s; then reheat it to 440℃ at a heating rate of 48℃ / s, keep it warm for 7s, and finally cool it to room temperature at a rate of 16℃ / s. Step 2: Slowly add 8%-10% of the purifier to the plating solution under sufficient stirring, stir and react for 32 minutes, stop for 18 minutes, continue stirring for 29 minutes, and then let it stand for 3.9 hours, filter the plating solution, and adjust the plating solution; The purifier is a mixture of 770g aluminum powder, 150g zinc powder, 20g sodium thiosulfate, 50g potassium sodium tartrate and 10g sodium alginate; wherein the particle size of the aluminum powder is 280 mesh; Step 3: Immerse the SAE flange in the plating solution in the hot dip tank for galvanizing. The galvanizing temperature is 470°C and the galvanizing time is 38 seconds. After the galvanizing is completed, remove it from the hot dip tank and wash it with water. Step 4: After the galvanizing is completed, the SAE flange is dipped in the sealing liquid, and the excess sealing liquid on the workpiece is removed; The sealing liquid includes the following components in parts by weight: 1-5 g acrylic polyurethane, 0.8 g KH560, 12 g zinc oxide, 40 g ethanol, 16 g epoxy vinyl resin, 7 g polytetrafluoroethylene, and 0.6 g hydrogen peroxide; Step 5: Bake after drying at a temperature of 145°C for 14 minutes to complete the galvanized anti-rust and corrosion treatment on the surface of the SAE flange.

[0020] Example 4 A surface galvanizing anti-rust and corrosion treatment process for SAE flange processing, specifically comprising the following processing steps: Step 1: Heat treat the SAE flange. The specific steps are as follows: Heat the SAE flange to 760℃, keep it warm for 130s, then cool it down to 650℃ at a rate of 10℃ / s, then cool it down to 250℃, 200℃, and 150℃ at a rate of 30℃ / s. When cooling to 250℃, keep it warm for 45s; when cooling to 200℃, keep it warm for 25s; when cooling to 150℃, keep it warm for 12s; then reheat it to 460℃ at a heating rate of 50℃ / s, keep it warm for 8s, and finally cool it to room temperature at a rate of 20℃ / s. Step 2: Slowly add 10% of the purifier to the plating solution under sufficient stirring, stir and react for 35 minutes, stop for 20 minutes, continue stirring for 30 minutes, and then let it stand for 4 hours, filter the plating solution, and adjust the plating solution; The purifier is a mixture of 770g aluminum powder, 150g zinc powder, 20g sodium thiosulfate, 50g potassium sodium tartrate and 10g sodium alginate; wherein the aluminum powder has a particle size of 300 mesh; Step 3: Immerse the SAE flange in the plating solution in the hot dip tank for galvanizing. The galvanizing temperature is 480°C and the galvanizing time is 40 seconds. After the galvanizing is completed, remove it from the hot dip tank and wash it with water. Step 4: After the galvanizing is completed, the SAE flange is dipped in the sealing liquid, and the excess sealing liquid on the workpiece is removed; The sealing solution includes the following components in parts by weight: 5g acrylic polyurethane, 1g KH560, 14g zinc oxide, 50g ethanol, 18g epoxy vinyl resin, 5-10g polytetrafluoroethylene, and 0.8g hydrogen peroxide; Step 5: Bake after drying at a temperature of 150°C for 15 minutes to complete the galvanized anti-rust and corrosion treatment on the surface of the SAE flange.

[0021] Comparative Example 1 Compared with Example 1, the difference is that the SAE flange is not subjected to heat treatment; the rest remains unchanged.

[0022] Comparative Example 2 Compared with Example 1, the difference is that no purifier is added; the rest remains unchanged.

[0023] like Figure 1 As shown, the surface of the SAE flange coating in Examples 1-3 is dense and smooth, while the surface of the SAE flange coating in Comparative Examples 1 and 2 is different from that in Examples 1-3, and uneven pinholes appear on the surface.

[0024] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0025] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0026] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A surface galvanizing anti-rust and corrosion treatment process for SAE flange processing, characterized in that: The specific processing steps include: Step 1: Heat treat the SAE flange; Step 2: slowly add a purifier to the plating solution under full stirring, stir and react for 25-35 minutes, stop for 10-20 minutes, continue stirring for 20-30 minutes, and then let it stand for 3.5-4 hours, filter the plating solution, and adjust the plating solution; the purifier includes the following components by weight: 75-80 parts of aluminum powder, 12-17 parts of zinc powder, 1-3 parts of sodium thiosulfate, 4-7 parts of potassium sodium tartrate, and 1-2 parts of sodium alginate; Step 3: Immerse the SAE flange in the plating solution in the hot dip tank for galvanizing, and remove it from the hot dip tank for washing after galvanizing. Step 4: After the galvanizing is completed, the SAE flange is dipped in a sealing liquid, and the excess sealing liquid on the workpiece is removed; the sealing liquid comprises the following components in parts by weight: 1-5 parts of acrylic polyurethane, 0.5-1 parts of KH560, 6-14 parts of zinc oxide, 20-50 parts of water-soluble alcohol, 10-18 parts of epoxy vinyl resin, 5-10 parts of polytetrafluoroethylene, and 0.2-0.8 parts of hydrogen peroxide; Step 5: Bake after drying to complete the galvanized anti-rust and corrosion treatment on the surface of the SAE flange.

2. The surface galvanizing anti-rust and anti-corrosion treatment process for SAE flange processing according to claim 1 is characterized by: The specific operation steps in step 1 are: Heat the SAE flange to 740-760℃, keep it warm for 120-130s, then cool it down to 620-650℃ at a rate of 5-10℃ / s, then cool it down to 250℃, 200℃, and 150℃ in sequence at a rate of 25-30℃ / s, then reheat it to 440-460℃ at a heating rate of 40-50℃ / s, keep it warm for 5-8s, and finally cool it to room temperature at a rate of 15-20℃ / s.

3. The surface galvanizing anti-rust and anti-corrosion treatment process for SAE flange processing according to claim 2 is characterized by: When the temperature drops to 250℃, keep it warm for 40-50s; when the temperature drops to 200℃, keep it warm for 20-30s; when the temperature drops to 150℃, keep it warm for 10-15s.

4. The surface galvanizing anti-rust and anti-corrosion treatment process for SAE flange processing according to claim 1 is characterized by: In the step 2, the amount of the purifier added is 8%-10% by weight of the zinc plating solution.

5. The surface galvanizing anti-rust and anti-corrosion treatment process for SAE flange processing according to claim 1 is characterized by: In the step three, the galvanizing temperature is 450-480° C., and the galvanizing time is 30-40 seconds.

6. The surface galvanizing anti-rust and anti-corrosion treatment process for SAE flange processing according to claim 1 is characterized by: In step 4, the water-soluble alcohol is selected from one or more of ethanol, methanol, propanol or butanol; the propanol is selected from one or both of n-propanol and isopropanol; the butanol is selected from one or more of n-butanol, isobutanol and tert-butanol.

7. The surface galvanizing anti-rust and anti-corrosion treatment process for SAE flange processing according to claim 1 is characterized by: In the step 5, the baking temperature is 135-150° C. and the baking time is 10-15 minutes.

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