Galvanizing treatment process for steel wire rope

Abstract

The galvanization treatment process comprises the preparation steps that S1, raw materials are prepared, specifically, a high-quality steel wire is selected, and oil stains and rust on the surface of the steel wire are cleaned and removed; s2, acid pickling treatment, wherein the cleaned steel wire is immersed in an acid pickling solution, and an oxide layer is removed; s3, washing: washing the pickled steel wire with clear water to remove residual acid liquor; s4, catalytic hydrogen oxidation treatment: immersing the washed steel wire into a sodium hydroxide solution, and carrying out surface passivation treatment; s5, galvanization treatment: putting the treated steel wire into a galvanization bath for galvanization; s6, cooling and drying are conducted, specifically, after galvanizing is completed, cooling and drying treatment are conducted through a cooling system; and S7, quality detection: detecting the galvanized steel wire rope. According to the technology, through multiple treatment steps, it is guaranteed that the surface of the steel wire rope is clean and evenly galvanized, the corrosion resistance of the steel wire rope is improved, and the quality of a final product has high consistency and reliability through fine technology control (such as temperature, concentration and time).

Description

Technical Field

[0001] The invention relates to the field of steel wire ropes, in particular to a galvanizing process for steel wire ropes. Background Art

[0002] Steel wire ropes are widely used in many fields such as construction, mining, shipping, cranes, etc., and have become important load-bearing materials due to their excellent mechanical properties and tensile strength. However, steel wire ropes are inevitably affected by environmental factors during use, especially corrosion. Corrosion not only reduces the load-bearing capacity of steel wire ropes, but may also cause serious safety hazards. Therefore, improving the corrosion resistance of steel wire ropes is a technical problem that needs to be solved urgently.

[0003] Galvanizing is an effective anti-corrosion technology that can form a zinc layer on the surface of the wire rope. The zinc layer not only has excellent corrosion resistance, but also provides mechanical protection to a certain extent. Galvanized wire rope has gradually become one of the main products on the market due to its excellent corrosion resistance and extended service life.

[0004] However, the existing galvanizing process still has shortcomings in terms of uniformity, adhesion and production efficiency of the galvanized layer. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] The purpose of the present invention is to provide a galvanizing process for steel wire ropes in view of the existing problems. The purpose of the present invention is to provide an improved galvanizing process for steel wire ropes to improve the uniformity, adhesion and production efficiency of the galvanized layer, thereby extending the service life of the steel wire ropes.

[0007] (II) Technical solution

[0008] To solve the above problems, the present invention provides the following technical solutions:

[0009] The technical scheme adopted by the present invention to achieve the above technical purpose is as follows: S1: raw material preparation: select high-quality steel wire, clean and remove surface oil and rust; S2: pickling treatment: immerse the cleaned steel wire in a pickling solution to remove the oxide layer; S3: water washing: rinse the pickled steel wire with clean water to remove residual acid; S4: catalytic oxidation treatment: immerse the washed steel wire in a sodium hydroxide solution for surface passivation treatment; S5: galvanizing treatment: put the treated steel wire into a galvanizing tank, and galvanize it by hot-dip galvanizing or electro-galvanizing; S6: cooling and drying: after galvanizing, cool it down through a cooling system and dry it; S7: quality inspection: the thickness and adhesion of the galvanized steel wire rope are inspected.

[0010] Furthermore, the pickling solution used in the pickling treatment in S2 is dilute hydrochloric acid with a concentration of 5% to 15% or sulfuric acid with a concentration of 5% to 10%.

[0011] Furthermore, in the water washing step in S3, clean water with a temperature of 15° C. to 25° C. is used for washing, and the washing time is 5 to 10 minutes.

[0012] Furthermore, the hot-dip galvanizing temperature used in the galvanizing treatment in S5 is 450°C to 480°C, or the current density of the electrogalvanizing is 1A / dm 2 Up to 5A / dm 2 .

[0013] Furthermore, the cooling system used in the cooling step in S6 is spray cooling or immersion cooling, and the cooling time is 5 to 20 minutes.

[0014] Furthermore, the drying process in S7 is carried out by hot air drying at a temperature of 60°C to 80°C, and the drying time is 15 to 30 minutes.

[0015] Furthermore, the quality inspection in S8 includes the galvanized layer thickness inspection and adhesion inspection. The thickness inspection adopts an ultrasonic thickness gauge and the adhesion inspection adopts a tape stripping method.

[0016] Furthermore, in the galvanizing step in S5, an auxiliary agent is added to improve the uniformity and compactness of the galvanized layer, and the auxiliary agent is a surfactant or a corrosion inhibitor.

[0017] (III) Beneficial effects

[0018] The beneficial effects of the present invention are:

[0019] The process ensures the clean and uniform galvanizing of the wire rope surface through multiple processing steps, thus improving its corrosion resistance.

[0020] Precise process control (such as temperature, concentration and time) ensures high consistency and reliability of the final product quality. DETAILED DESCRIPTION

[0021] The following will be combined with 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.

[0022] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0023] A galvanizing process for a steel wire rope comprises the following steps:

[0024] 1. Raw material preparation (S1)

[0025] Select steel wire: Make sure the steel wire used complies with relevant standards (such as GB / T 20118 or ASTM A1023).

[0026] Cleaning: Use special cleaning agents and cleaning equipment (such as ultrasonic cleaning machines) to remove oil and impurities on the surface of the steel wire. The cleaning agent should be selected according to the degree of contamination on the surface of the steel wire. The appropriate type and concentration should be selected.

[0027] Drying: After cleaning, let the wire dry naturally in a well-ventilated area, or use hot air drying equipment to speed up the drying process.

[0028] 2. Pickling treatment (S2)

[0029] Implementation method:

[0030] Prepare acid solution: Prepare 5% to 15% dilute hydrochloric acid or 5% to 10% sulfuric acid solution according to the desired pickling effect. Be sure to wear protective equipment (such as gloves and goggles) when preparing.

[0031] Soaking: Immerse the wire in the acid solution for 10 to 30 minutes, depending on the degree of oxidation of the wire. Use a pickling tank and ensure that the liquid in the tank flows evenly.

[0032] Monitoring: Check the surface condition of the steel wire regularly to ensure that the pickling effect is good.

[0033] 3. Washing (S3)

[0034] Implementation method:

[0035] Flushing equipment: Use a high-pressure water gun or spray device to quickly rinse the steel wire with clean water after taking it out of the pickling tank. The flushing time is 5 to 10 minutes to ensure that the acid is completely removed.

[0036] Check the wire: After rinsing, check whether there is residual acid or impurities on the surface of the wire. Repeat the rinsing step if necessary.

[0037] 4. Hydrogen catalytic oxidation treatment (S4)

[0038] Implementation method:

[0039] Prepare sodium hydroxide solution: Prepare 2% to 5% sodium hydroxide solution, and pay attention to protection during operation.

[0040] Soaking: Immerse the washed steel wire in a sodium hydroxide solution for 5 to 10 minutes to form a protective passivation film.

[0041] Rinse: Rinse with clean water immediately after soaking to ensure that any sodium hydroxide residue is removed.

[0042] 5. Galvanizing (S5)

[0043] Implementation method:

[0044] Hot-dip galvanizing: Molten zinc bath: Heat the zinc to 450°C to 480°C and keep it in liquid state.

[0045] Soaking steel wire: slowly immerse the treated steel wire in molten zinc for 2 to 5 minutes to ensure uniform coating.

[0046] Remove: After removing, cool naturally on a cooling rack next to the zinc bath to allow the zinc layer to solidify.

[0047] Electrogalvanizing: Electroplating tank configuration: Configure an electroplating tank and use an electrolyte containing zinc salt.

[0048] Current setting: Set the appropriate current density (1A / dm 2 Up to 5A / dm 2 ).

[0049] Galvanizing time: Control the galvanizing time, usually 10 to 30 minutes, adjusted according to the required coating thickness.

[0050] 6. Cooling and drying (S6)

[0051] Implementation method:

[0052] Cooling method: Use spray cooling or immerse the galvanized steel wire in a cooling water tank. The cooling time should be controlled within 5 to 20 minutes to ensure the stability of the coating.

[0053] Drying treatment: Set the temperature in the drying oven to 60℃ to 80℃ and the drying time to 15 to 30 minutes to ensure that there is no moisture on the surface of the galvanized layer.

[0054] 7. Quality inspection (S7)

[0055] Implementation method:

[0056] Coating thickness detection: Use an ultrasonic thickness gauge to detect the thickness of the galvanized layer to ensure that it meets the specification requirements (usually above 50μm).

[0057] Adhesion test: Use the tape peeling method to stick special tape and quickly tear it off to evaluate the adhesion of the galvanized layer.

[0058] For those skilled in the art, various other corresponding changes and modifications can be made according to the technical solutions and concepts described above, and all of these changes and modifications should fall within the protection scope of the claims of the present invention.

[0059] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and scope of the equivalent elements of the claims be included in the invention. Any marking in a claim should not be considered as limiting the claim to which it relates.

[0060] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A galvanizing process for steel wire rope, characterized in that: include: S1: Raw material preparation: Select high-quality steel wire and clean it to remove surface oil and rust; S2: Pickling treatment: immerse the cleaned steel wire in a pickling solution to remove the oxide layer; S3: Water washing: rinse the pickled steel wire with clean water to remove residual acid; S4: Hydrogen catalytic oxidation treatment: immerse the washed steel wire in a sodium hydroxide solution for surface passivation treatment; S5: Galvanizing treatment: Put the treated steel wire into the galvanizing tank and galvanize it by hot-dip galvanizing or electro-galvanizing; S6: Cooling and drying: After galvanizing, the temperature is lowered through the cooling system and dried; S7: Quality inspection: The galvanized steel wire rope is tested for thickness and adhesion.

2. A galvanizing process for steel wire rope according to claim 1, characterized in that: The pickling solution used in the pickling treatment in S2 is dilute hydrochloric acid with a concentration of 5% to 15% or sulfuric acid with a concentration of 5% to 10%.

3. The galvanizing process for steel wire rope according to claim 1, characterized in that: In the water washing step in S3, clean water with a temperature of 15° C. to 25° C. is used for washing, and the washing time is 5 to 10 minutes.

4. The galvanizing process for steel wire rope according to claim 1, characterized in that: The concentration of the sodium hydroxide solution in the hydrogenation treatment in S4 is 2% to 5%.

5. The galvanizing process for steel wire rope according to claim 1, characterized in that: The galvanizing treatment in S5 adopts a hot-dip galvanizing temperature of 450°C to 480°C, or an electrogalvanizing current density of 1A / dm 2 Up to 5A / dm 2 .

6. The galvanizing process for steel wire rope according to claim 1, characterized in that: The cooling system used in the cooling step in S6 is spray cooling or immersion cooling, and the cooling time is 5 to 20 minutes.

7. The galvanizing process for steel wire rope according to claim 1, characterized in that: The drying process in S7 is carried out by hot air drying at a temperature of 60° C. to 80° C., and the drying time is 15 to 30 minutes.

8. The galvanizing process for steel wire rope according to claim 1, characterized in that: The quality inspection in S8 includes the galvanized layer thickness inspection and adhesion inspection. The thickness inspection adopts an ultrasonic thickness gauge, and the adhesion inspection adopts a tape stripping method.

9. The galvanizing process for steel wire rope according to claim 1, characterized in that: In the galvanizing step in S5, an auxiliary agent is added to improve the uniformity and density of the galvanized layer, and the auxiliary agent is a surfactant or a corrosion inhibitor.