Production process of anti-corrosion wagon balance sensor

Abstract

The invention discloses a production process of an anti-corrosion wagon balance sensor. The production process comprises the following steps: S1, forming a pasting groove; s2, densified bottom layer immersion plating; s3, immersion plating of an anti-corrosion layer; s4, zinc passivation treatment is conducted, specifically, the galvanized elastomer is immersed in the composite passivation solution, and after drying, a passivation film with the thickness being 0.5-1 micron is formed on the surface of the elastomer; and S5, organic sealing. The Ni-P alloy high-phosphorus nickel bottom layer formed through high-phosphorus chemical nickel plating is of an amorphous structure, the corrosion resistance can be greatly improved to resist deep pitting corrosion, a uniform substrate is provided for the zinc layer, a stable complex is formed through alkaline cyanide-free zinc plating, it is ensured that the zinc layer is evenly deposited to serve as a sacrificial anode, an elastomer base material is preferentially corroded and protected, and the corrosion resistance is improved. A compact Cr2O3 film is generated on the surface of a zinc layer after passivating treatment, and through a multi-layer protection system of the high-phosphorus nickel bottom layer, the zinc anti-corrosion layer, the composite passivating film and the organic sealing film, all the layers cooperate to block corrosion medium permeation, so that the corrosion resistance of the elastomer is greatly improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of load cell sensors, and particularly relates to a production process of a corrosion-resistant load cell sensor. BACKGROUND

[0002] The load cell sensor is a core component of an electronic load cell, and its function is to convert the weight of an object into an electrical signal output, directly affecting the accuracy and stability of the weighing system. The resistance strain sensor, as a mainstream technology, is widely used. The resistance strain sensor is a load-bearing work that is completed by converting the resistance value change of a strain gauge caused by the deformation of a metal elastic body under stress into an electrical signal.

[0003] The elastic body of the load cell sensor is a core component of force-electricity conversion. In some special working environments, it needs to withstand dynamic load and environmental corrosion for a long time. The corrosion resistance directly determines the service life of the sensor. In the conventional "nickel plating + zinc plating" process, an oxide film (NiO) is easily formed on the surface of the nickel layer, resulting in insufficient adhesion when the zinc layer is deposited. The zinc layer is easy to fall off when it is bent or deformed, so that the elastic body is easily corroded, affecting the normal work of the load cell sensor. SUMMARY

[0004] In view of the problems in the prior art, the technical scheme is as follows:

[0005] The production process of the corrosion-resistant load cell sensor comprises the following steps:

[0006] S1, opening a pasting groove: using a CNC machining center to mill a corresponding number of pasting grooves on the surface of the elastic body, and after fine grinding the surface of the pasting groove, stress relief treatment and pretreatment are performed;

[0007] S2, dense bottom layer immersion plating: placing the pretreated elastic body into a high-phosphorus chemical nickel plating tank, immersing for 60-90 min at 85 DEG C, and the plating solution of high-phosphorus chemical nickel forms a high-phosphorus nickel bottom layer with a thickness of 5-8 microns and a phosphorus content of 8-12% on the surface of the elastic body. The plating solution of high-phosphorus chemical nickel comprises 245-255 g / L nickel sulfate, 13-17 g / L citric acid and 18-22 g / L sodium hypophosphite;

[0008] S3, corrosion-resistant layer immersion plating: placing the elastic body into an alkaline cyanide-free zinc plating tank, immersing for 40-60 min at a temperature of 25 DEG C, and the plating solution of alkaline cyanide-free zinc plating forms a zinc layer with a thickness of 8-12 microns on the surface of the elastic body, and after immersion plating, deionized water is rinsed to neutral. The plating solution of alkaline cyanide-free zinc plating comprises 8-12 g / L zinc oxide, 20-30 g / L triethanolamine and 50 g / L sodium hydroxide;

[0009] S4, zinc passivation: the galvanized elastomer is immersed in a composite passivation solution, treated at 40-50°C for 60-90s, and dried to form a passivation film with a thickness of 0.5-1μm on the surface of the elastomer, the composition of the passivation solution including 3.9-4.2g / L chromium sulfate, 2.8-3.1g / L silane and 0.7-0.9g / L cerous nitrate;

[0010] S5, organic sealing: the passivated elastomer is coated with an organic sealing agent by dipping, and dried at 120-140°C for 20min to form a sealing film with a thickness of 1-2μm on the surface of the elastomer, completing the processing of the elastomer.

[0011] As a preferred embodiment of the above technical solution, it further comprises S6, strain gauge assembly: a fixing glue is coated on the surface of the bonding groove, and then the strain gauge is loaded into the bonding groove, the strain gauge is lightly pressed for 10-15s using a silicone rubber pressing block, and the excess glue is discharged and then cured;

[0012] As a preferred embodiment of the above technical solution, it further comprises S7, lead welding and circuit assembly: the leads of the strain gauges in each bonding groove are concentrated and led to the terminal area and welded, then different bridge assembly schemes are set according to the number of strain gauges, and temperature compensation and performance calibration are performed after the bridge assembly is completed, completing the production of the load cell sensor.

[0013] As a preferred embodiment of the above technical solution, an intermediate layer plating and activation is arranged between the S2 step and the S3 step, comprising the following contents:

[0014] A1, the nickel-plated elastomer is transferred into a semi-bright nickel plating tank, and electroplated at room temperature for 30-45min to form a semi-bright nickel layer with a thickness of 3-5μm on the surface of the elastomer, and then deionized water is used for rinsing and drying;

[0015] A2, intermediate layer activation transition: the nickel-plated elastomer is immersed in an activation solution, treated at room temperature for 30-60s to remove the oxide film on the surface of the nickel layer and form a micro-rough surface with Ra=0.5-0.8μm, and immediately rinsed with deionized water after activation;

[0016] As a preferred embodiment of the above technical solution, the composition of the activation solution is 5-8% dilute hydrochloric acid, 0.2-0.5% citric acid and 91.5-94.8% deionized water.

[0017] As a preferred embodiment of the above technical solution, the composition of the organic sealing agent is 30-40% aqueous acrylate emulsion, 1-2% nanosilica and 58-69% deionized water.

[0018] As a preferred embodiment of the above technical solution, the pretreatment of the S1 step comprises the following steps:

[0019] B1 degreasing: using 40-50℃ low-temperature alkaline degreasing agent combined with ultrasonic cleaning to remove cutting oil and anti-rust oil on the surface of the elastomer, and then rinsing with deionized water for 2-3 times;

[0020] B2 pickling and rust removal: immersing the elastomer in 5% dilute hydrochloric acid containing 0.5% urotropine corrosion inhibitor at room temperature for 5-8 min to remove the oxide skin on the surface of the elastomer, and then rinsing with deionized water until pH=6-7;

[0021] B3 phosphating: immersing the elastomer in zinc-based phosphating solution at 60℃ for 8 min to form a 5-8μm phosphating film on the surface of the elastomer, and then drying and entering the S2 step.

[0022] As a preferred embodiment of the above technical solution, the components of the alkaline degreasing agent are 5% sodium carbonate, 2% non-ionic surfactant and 3% deionized water.

[0023] As a preferred embodiment of the above technical solution, the components of the zinc-based phosphating solution are 8% zinc phosphate, 3% nickel nitrate and 89% deionized water.

[0024] The beneficial effects of the present application are:

[0025] 1. When high-phosphorus electroless nickel plating is performed first, the non-crystalline Ni-P alloy high-phosphorus nickel bottom layer is formed by the reduction reaction of sodium hypophosphite, which has a non-crystalline structure and can greatly improve the corrosion resistance to resist deep pitting corrosion, and provides a uniform substrate for the zinc layer. When alkaline cyanide-free zinc plating is performed, a stable complex is formed by the reaction of triethanolamine with zinc ions, ensuring uniform deposition of the zinc layer to act as a sacrificial anode, preferentially corroding to protect the elastomer substrate. After passivation, a dense Cr2O3 film is formed on the surface of the zinc layer, and silane forms an organic silicon layer through hydrolysis-condensation reaction to protect the zinc layer. The organic sealing agent can fill the pores of the passivation film, forming a hydrophobic layer that further blocks water vapor penetration. Through the multi-layer protection system of "high-phosphorus nickel bottom layer, zinc corrosion-resistant layer, composite passivation film, and organic sealing film", each layer cooperates to block the penetration of corrosive media, thereby greatly improving the corrosion resistance of the elastomer.

[0026] 2. The semi-bright nickel layer with high ductility and low stress characteristics acts as a transition layer, which can buffer the stress difference between the high-phosphorus nickel layer and the zinc layer. The flat surface of the semi-bright nickel layer provides a uniform deposition substrate for the zinc layer, preventing uneven thickness of the zinc layer caused by micro-protrusions on the surface of the high-phosphorus nickel layer. The semi-bright nickel layer acts as an intermediate barrier, blocking the penetration of corrosive media through the micro-pores of the zinc layer to the high-phosphorus nickel layer. At the same time, the micro-rough surface formed by activation makes the zinc layer and the nickel layer contact more closely through the "mechanical anchoring effect", avoiding "interlayer crevice corrosion" and further improving the corrosion resistance of the elastomer.

[0027] 3. The elastomer that has undergone pickling and phosphating pretreatment can remove its surface oxide scale and form a porous phosphating film on its surface. The porous phosphating film, as an "anchoring structure", can significantly improve the bonding force between the high phosphorus nickel layer and the elastomer, making the high phosphorus nickel bottom layer more tightly bonded to the elastomer and preventing the plating layer from falling off from the bottom layer. Attached Figure Description

[0028] Figure 1 The diagram shown is a schematic representation of the overall structure of the embodiment. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments and the accompanying drawings.

[0030] Figure 1 The manufacturing process of corrosion-resistant weighbridge sensors includes the following steps:

[0031] S1. Create adhesive grooves: Use a CNC machining center to mill the corresponding number of adhesive grooves on the surface of the elastomer. After fine grinding of the adhesive groove surface, stress relief treatment and pretreatment are performed.

[0032] The preprocessing step S1 includes the following steps;

[0033] B1 Degreasing: Use a low-temperature alkaline degreasing agent at 40-50℃. The alkaline degreasing agent consists of 5% sodium carbonate, 2% nonionic surfactant and 3% deionized water. Combine with ultrasonic cleaning to remove cutting oil and rust-preventive oil from the surface of the elastomer. After cleaning, rinse with deionized water 2-3 times.

[0034] B2 pickling and rust removal: Immerse the elastomer in 5% dilute hydrochloric acid at room temperature for 5-8 minutes to remove the oxide scale on the surface of the elastomer, and then rinse with deionized water until pH=6-7. The dilute hydrochloric acid contains 0.5% hexamethylenetetramine corrosion inhibitor.

[0035] Dilute hydrochloric acid is used to remove oxide scale and expose the fresh substrate surface. The reaction equation for dilute hydrochloric acid (containing 0.5% hexamethylenetetramine) with Fe2O3 is as follows:

[0036] Fe₂O₃ + 6HCl = 2FeCl₃ + 3H₂O;

[0037] Urotropine can be adsorbed onto the substrate surface, inhibiting excessive corrosion of Fe by hydrochloric acid.

[0038] B3 Phosphating Base Treatment: The elastomer is immersed in a zinc-based phosphating solution at 60°C for 8 minutes. The zinc-based phosphating solution consists of 8% zinc phosphate, 3% nickel nitrate, and 89% deionized water, which forms a 5-8 μm phosphating film on the surface of the elastomer. After drying, it proceeds to step S2.

[0039] The elastomer and zinc-based phosphating solution form a porous phosphating film on the surface, which enhances the anchoring effect of the subsequent nickel plating layer. The reaction equation between the zinc-based phosphating solution and Fe is as follows:

[0040] 3Zn(H2PO4)2+Fe=Zn3(PO4)2·4H2O(phosphating film)+Fe(H2PO4)2+2H2↑.

[0041] The acid pickling and phosphating pretreatment of the elastomer can remove the oxide scale on its surface and form a porous phosphating film on its surface. The porous phosphating film, as an anchoring structure, can greatly improve the bonding force between the high phosphorus nickel layer and the elastomer, making the high phosphorus nickel bottom layer more tightly bonded to the elastomer and preventing the coating from falling off from the bottom layer.

[0042] S2. Dense Underlayer Immersion Plating: The pretreated elastomer is placed in a high-phosphorus electroless nickel plating bath and immersed at 85°C for 60-90 minutes. The high-phosphorus electroless nickel plating solution forms a high-phosphorus nickel underlayer with a thickness of 5-8 μm and a phosphorus content of 8-12% on the surface of the elastomer. The high-phosphorus electroless nickel plating solution consists of 245-255 g / L nickel sulfate, 13-17 g / L citric acid and 18-22 g / L sodium hypophosphite.

[0043] Sodium hypophosphite (NaH2PO2) is used as a reducing agent to reduce nickel sulfate (NiSO4) at 85℃ and pH=4.5. Simultaneously, phosphorus is co-deposited, forming an amorphous Ni-P layer (without grain boundary pores), which exhibits corrosion resistance far exceeding that of ordinary nickel plating. The reaction equation is as follows:

[0044] Decomposition of reducing agent: H2PO2- + H2O → HPO3 2 -+3H + +2e - (Generates electrons);

[0045] Nickel ion reduction: Ni 2+ +2e - →Ni (metallic nickel deposited on the substrate surface);

[0046] Phosphorus co-deposition: H₂PO₂⁻ + e⁻ - →P+2OH- (Phosphorus reacts with nickel to form a Ni-P alloy layer, with a phosphorus content of 8-12%).

[0047] An intermediate layer of electroplating and activation is provided between steps S2 and S3, including the following:

[0048] A1. Transfer the nickel-plated elastomer into a semi-bright nickel electroplating bath and electroplat for 30-45 minutes at room temperature. A semi-bright nickel layer with a thickness of 3-5 μm is formed on the surface of the elastomer. Then rinse with deionized water and dry.

[0049] Ni in electroplating tank2+ Cathode (elastomer) electron reduction: Ni 2+ + 2e - → Ni, benzyl acetaldehyde (brightener) adsorbed on the grain boundary, inhibiting abnormal grain growth, forming semi-bright plating, semi-bright nickel layer with ductility (elongation ≥ 20%) and flatness, buffering the stress conflict of high-phosphorus nickel and zinc layer.

[0050] A2, intermediate layer activation transition: immerse the nickel-plated elastomer in an activation solution, treat at room temperature for 30-60s, remove the nickel layer surface oxide film and form a micro-rough surface with Ra = 0.5-0.8 μm, and immediately after activation, rinse with deionized water, the activation solution composition is 5-8% dilute hydrochloric acid, 0.2-0.5% citric acid and 91.5-94.8% deionized water;

[0051] Dilute hydrochloric acid dissolves the nickel layer surface oxide film, the reaction equation is:

[0052] NiO + 2HCl = NiCl2 + H2O;

[0053] And the internal citric acid (0.2-0.5%) complex Ni 2+ , avoid over-corrosion of the nickel layer, can remove NiO, form a micro-rough surface with Ra = 0.5-0.8 μm, and the zinc layer adhesion is improved to the grid 0 level.

[0054] The semi-bright nickel layer with high ductility and low stress characteristics as a transition layer can buffer the stress difference between the high-phosphorus nickel layer and the zinc layer, and the flat surface of the semi-bright nickel layer can provide a uniform deposition substrate for the zinc layer, avoiding uneven thickness of the zinc layer caused by the micro-protrusions on the surface of the high-phosphorus nickel, and the semi-bright nickel layer as an intermediate barrier can block the path of corrosion medium penetrating from the zinc layer micropores to the high-phosphorus nickel layer, at the same time, the micro-rough surface formed by activation makes the zinc layer and the nickel layer contact more closely through the "mechanical anchoring effect", avoiding "interlayer gap corrosion", further improving the corrosion resistance of the elastomer.

[0055] S3, immersion plating of corrosion-resistant layer: put the elastomer into an alkaline cyanide-free zinc plating bath, immerse for 40-60 min at a temperature of 25, and the alkaline cyanide-free zinc plating bath forms a zinc layer with a thickness of 8-12 μm on the surface of the elastomer, and then rinse with deionized water to neutral, the composition of the alkaline cyanide-free zinc plating bath includes 8-12 g / L zinc oxide, 20-30 g / L triethanolamine and 50 g / L sodium hydroxide;

[0056] In the zinc plating bath, zinc oxide (ZnO) and sodium hydroxide (NaOH) form zincate complex ions ([Zn(OH)4]2-), and triethanolamine assists in complexing and stabilizing Zn 2+ , cathode reduction during electrolysis, making the internal stress ≤ 80 MPa, adapting to the dynamic deformation of the elastomer, the reaction equation is:

[0057] Coordination equilibrium: ZnO + 2NaOH + H2O → Na2[Zn(OH)4];

[0058] Cathodic reduction: [Zn(OH)4]2-+ 2e - → Zn + 4OH (zinc layer deposition, thiourea derivative inhibits internal stress).

[0059] S4, zinc passivation: dip the galvanized elastomer into a composite passivation solution, treat at 40-50°C for 60-90s, and after drying, form a passivation film with a thickness of 0.5-1 μm on the surface of the elastomer, the composition of the passivation solution including 3.9-4.2 g / L chromium sulfate, 2.8-3.1 g / L silane, and 0.7-0.9 g / L cerium nitrate;

[0060] After zinc passivation, the generated passivation film has both the corrosion resistance of Cr2O3 and the flexibility of silane, trivalent chromium oxidation: chromium sulfate (Cr2(SO4)3) generates Cr2O3 dense film under the action of cerium nitrate (Ce(NO3)4, oxidant), the reaction equation being:

[0061] 2Cr 3+ + 3H2O → Cr2O3 + 6H + ;

[0062] Silane crosslinking: hydrolysis of γ-aminopropyl triethoxysilane (KH-550) generates silanol (-Si-OH), which condenses with the surface hydroxyl (-OH) of Cr2O3 to form an organic-inorganic composite film, the reaction equation being:

[0063] -Si-OH + HO-Cr- → -Si-O-Cr- + H2O.

[0064] S5, organic sealing: after passivation, the elastomer is coated with an organic sealing agent by dipping and dried at 120-140°C for 20 min, forming a sealing film with a thickness of 1-2 μm on the surface of the elastomer, completing the processing of the elastomer, the composition of the organic sealing agent being 30-40% aqueous acrylate emulsion, 1-2% nanosilica, and 58-69% deionized water.

[0065] First, the high-phosphorus electroless nickel plating is carried out, and then the non-crystalline Ni-P alloy high-phosphorus nickel bottom layer is formed by the reduction reaction of sodium hypophosphite, which can greatly improve the corrosion resistance to resist deep pitting corrosion and provide a uniform substrate for the zinc layer. Then, the stable complex of triethanolamine and zinc ions is formed to ensure the uniform deposition of the zinc layer as a sacrificial anode to preferentially protect the elastomer substrate from corrosion. After passivation, a dense Cr2O3 film is formed on the surface of the zinc layer, and the silane forms an organic silicon layer through hydrolysis-condensation reaction to protect the zinc layer. The organic sealing agent can fill the micropores of the passivation film and form a hydrophobic layer to further block the penetration of water vapor. Through the multi-layer protection system of "high-phosphorus nickel bottom layer, zinc corrosion-resistant layer, composite passivation film, and organic sealing film", each layer cooperates to block the penetration of corrosive media, thereby greatly improving the corrosion resistance of the elastomer.

[0066] It also includes S6 strain gauge assembly: coat the fixing glue on the surface of the bonding groove, then install the strain gauge into the bonding groove, press the strain gauge for 10-15s using a silicone rubber block, and then perform curing treatment after removing the excess glue;

[0067] It also includes S7 lead welding and circuit assembly: concentrate the leads of the strain gauges in each bonding groove to the terminal area and weld them, then set different bridge assembly schemes according to the number of strain gauges, and perform temperature compensation and performance calibration after the bridge assembly is completed to complete the production work of the load cell sensor.

[0068] Example 1

[0069] Substrate: 65Mn spring steel (industrial general type)

[0070] Process parameters:

[0071] S1: bonding groove size 3mm×15mm×0.15mm, Ra=0.3μm after grinding, stress relief treatment 350℃×3h;

[0072] S2: high-phosphorus nickel plating 85℃×80min, nickel layer thickness 6μm (phosphorus content 10%);

[0073] A1: semi-bright nickel electroplating room temperature×40min, thickness 4μm;

[0074] A2: 6% dilute hydrochloric acid + 0.3% citric acid activation 45s;

[0075] S3: zinc plating 25℃×50min, zinc layer thickness 10μm;

[0076] S4: passivation 45℃×80s; S5: organic sealing 130℃×20min, film thickness 1.5μm;

[0077] S6: strain gauge model BF120-3AA, 3MDP460 glue curing 80℃×24h.

[0078] Anti-corrosion detection data:

[0079]

[0080] Example 2

[0081] Substrate: 316L stainless steel (special for marine environment)

[0082] Process parameters:

[0083] S1: Adhesion groove size 4mm x 20mm x 0.2mm, Ra = 0.2um after grinding, stress relief treatment 400℃ x 2h;

[0084] S2: High phosphorus nickel plating 85℃ x 60min, nickel layer thickness 5um (phosphorus content 8%);

[0085] A1: Semi-bright nickel electroplating room temperature x 30min, thickness 3um;

[0086] A2: 5% dilute hydrochloric acid + 0.2% citric acid activation 30s;

[0087] S3: Zinc plating 25℃ x 40min, zinc layer thickness 8um;

[0088] S4: Passivation 40℃ x 60s; S5: Organic sealing 120℃ x 20min, film thickness 1um;

[0089] S6: Strain gauge type BX120-5AA (salt spray resistant type), curing pressure 0.8MPa.

[0090] Anti-corrosion detection data:

[0091]

[0092] Substrate: 40Cr alloy structural steel (heavy load scenario)

[0093] Process parameters:

[0094] S1: Adhesion groove size 5mm x 25mm x 0.18mm, Ra = 0.4um after grinding, stress relief treatment 300℃ x 4h;

[0095] S2: High phosphorus nickel plating 85℃ x 90min, nickel layer thickness 8um (phosphorus content 12%);

[0096] A1: Semi-bright nickel electroplating room temperature x 45min, thickness 5um;

[0097] A2: 8% dilute hydrochloric acid + 0.5% citric acid activation 60s;

[0098] S3: galvanizing 25°C x 60 min, zinc layer thickness 12 μm;

[0099] S4: passivation 50°C x 90 s; S5: organic sealing 140°C x 20 min, film thickness 2 μm;

[0100] S6: strain gauge type BE 120-6 AA (large strain range), curing temperature 100°C x 20 h. Corrosion protection test data:

[0101]

[0102] The above examples are only used to illustrate the technical solutions of the present application, but not limit it.

Claims

1. A process for the production of corrosion-protected load cell sensors, characterized in that It comprises the following steps: S1, open the paste groove: using CNC machining center in the surface of the elastomer corresponding number of milling paste groove, paste groove surface fine grinding after stress relief treatment and pretreatment work; S2, dense bottom immersion: the pretreated elastomer into high phosphorus electroless nickel tank, immersion 60-90min at 85℃, high phosphorus electroless nickel plating solution in the elastomer surface form thickness 5-8μm, phosphorus content 8-12% of high phosphorus nickel bottom layer, the high phosphorus electroless nickel plating solution composition includes 245-255g / L nickel sulfate, 13-17g / L citric acid and 18-22g / L sodium hypophosphite; S3, corrosion layer immersion: the elastomer into alkaline cyanide free zinc plating tank, immersion 40-60min at temperature 25, alkaline cyanide free zinc plating solution in the elastomer surface form thickness 8-12μm of zinc layer, and after immersion deionized water rinse to neutral, the alkaline cyanide free zinc plating solution composition includes 8-12g / L zinc oxide, 20-30g / L triethanolamine and 50g / L sodium hydroxide; S4, zinc passivation treatment: the zinc plated elastomer is immersed in a composite passivation solution at 40-50℃ for 60-90s, and a passivation film with a thickness of 0.5-1μm is formed on the surface of the elastomer after drying, the passivation solution comprises 3.9-4.2g / L chromium sulfate, 2.8-3.1g / L silane and 0.7-0.9g / L cerous nitrate; S5, organic sealing: the passivated elastomer is coated with an organic sealing agent by immersion method, and is dried at 120-140℃ for 20min, forming a sealing film with a thickness of 1-2μm on the surface of the elastomer, completing the processing of the elastomer.

2. The corrosion-proof load cell production process of claim 1, wherein, It also includes S6 strain gauge assembly: coating the surface of the paste groove with fixing glue, then loading the strain gauge into the paste groove, lightly pressing the strain gauge with a silicone press block for 10-15s, and then performing solidification treatment after removing the excess glue.

3. The corrosion-proof load cell production process of claim 2, wherein, It also includes S7 lead welding and circuit assembly: the leads of the strain gauges in each paste groove are concentrated and welded to the terminal area, then different bridge assembly schemes are set according to the number of strain gauges, and temperature compensation and performance calibration are performed after the bridge assembly is completed, completing the production of the load cell sensor.

4. The corrosion-proof load cell production process of claim 1, wherein, The S2 step and the S3 step are provided with an intermediate layer electroplating and activation, including the following contents: A1, the nickel plated elastomer is transferred into a semi-bright nickel electroplating tank and electroplated at room temperature for 30-45min, forming a semi-bright nickel layer with a thickness of 3-5μm on the surface of the elastomer, then performing deionized water rinsing and drying; A2, intermediate layer activation transition: the nickel plated elastomer is immersed in an activation solution at room temperature for 30-60s, removing the oxide film on the surface of the nickel layer and forming a micro-rough surface with Ra=0.5-0.8μm, and immediately rinsing with deionized water after activation.

5. The corrosion-proof load cell production process of claim 4, wherein, The composition of the activation solution is 5-8% dilute hydrochloric acid, 0.2-0.5% citric acid and 91.5-94.8% deionized water.

6. The corrosion-proof load cell production process of claim 1, wherein, The composition of the organic sealing agent is 30-40% water-based acrylate emulsion, 1-2% nano silicon dioxide and 58-69% deionized water.

7. The corrosion-proof load cell production process of claim 2, wherein, The pretreatment of the S1 step includes the following steps; B1 degreasing: using 40-50℃ low temperature alkaline degreasing agent, combined with ultrasonic cleaning to remove the cutting oil and rust-proof oil on the surface of the elastomer, after cleaning, rinsing with deionized water for 2-3 times; B2 pickling and rust removal: immersing the elastomer in 5% dilute hydrochloric acid containing 0.5% urotropine corrosion inhibitor at room temperature for 5-8 min to remove the oxide skin on the surface of the elastomer, then rinsing with deionized water until pH=6-7; B3 phosphating: immersing the elastomer in zinc-based phosphating solution at 60℃ for 8 min to form 5-8μm phosphating film on the surface of the elastomer, and then drying and entering S2 step.

8. The corrosion-proof load cell production process of claim 7, wherein, The components of the alkaline degreasing agent are 5% sodium carbonate, 2% non-ionic surfactant and 3% deionized water.

9. The corrosion-proof load cell production process of claim 7, wherein, The components of the zinc-based phosphating solution are 8% zinc phosphate, 3% nickel nitrate and 89% deionized water.

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