Corrosion-resistant and wear-resistant pressure transmitter and production method thereof

Abstract

The invention relates to a corrosion-resistant and wear-resistant pressure transmitter and a production method thereof, the corrosion-resistant and wear-resistant pressure transmitter comprises a negative pressure side body, a positive pressure side body, a negative pressure side isolation diaphragm and a positive pressure side isolation diaphragm, and the negative pressure side body and the positive pressure side body are fixed together; the negative pressure side isolation diaphragm comprises a negative pressure side substrate material layer, a nickel plating layer, a nickel aminosulfonate plating layer, a gold plating layer, a nickel aminosulfonate plating layer and a high-phosphorus chemical nickel plating layer; the positive pressure side isolation diaphragm comprises a positive pressure side substrate material layer, a nickel plating layer, a nickel aminosulfonate plating layer, a gold plating layer, a nickel aminosulfonate plating layer and a high-phosphorus chemical nickel plating layer. The production method comprises the steps of welding, ultrasonic electrolysis oil removal, hot water soaking, soaking in hydrochloric acid, nickel plating, nickel aminosulfonate plating, gold plating, nickel aminosulfonate plating and high-phosphorus chemical nickel plating. Due to the fact that the negative pressure side isolation diaphragm and the positive pressure side isolation diaphragm which are resistant to abrasion and corrosion are adopted, the phenomena of corrosion and abrasion in the using process can be reduced, and the service life of the diaphragm is greatly prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of measuring instruments, and specifically discloses a corrosion-resistant and wear-resistant pressure transmitter and a production method thereof. Background Art

[0002] In the production process of coal chemical industry, the corrosion of production equipment by various acid, alkali, salt production raw materials and other substances and the wear of instruments by high-hardness solid particles are common problems. The pressure transmitters used in process measurement are seriously corroded and worn, which greatly reduces the service life of the instruments. In the actual measurement process, the instruments frequently fail and have a short service life. Enterprises maintain the normal operation of the production process by frequently replacing instruments, which increases the operation and maintenance costs of enterprises. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a corrosion-resistant and wear-resistant pressure transmitter with a prolonged service life and a production method thereof.

[0004] According to the technical solution provided by the present invention, the corrosion-resistant and wear-resistant pressure transmitter comprises a negative pressure side body, a positive pressure side body, a negative pressure side isolation diaphragm and a positive pressure side isolation diaphragm, and the negative pressure side body and the positive pressure side body are fixed together; The negative pressure side isolation diaphragm comprises a negative pressure side base material layer, a negative pressure side nickel plating layer, a negative pressure side first sulfamate nickel plating layer, a negative pressure side gold plating layer, a negative pressure side second sulfamate nickel plating layer and a negative pressure side high-phosphorus chemical nickel plating layer; The negative pressure side base material layer is welded on the outer wall of the negative pressure side body, a negative pressure side nickel plating layer is provided on the negative pressure side base material layer, a negative pressure side first sulfamate nickel plating layer is provided on the negative pressure side nickel plating layer, a negative pressure side gold plating layer is provided on the first sulfamate nickel plating layer on the negative pressure side, a negative pressure side second sulfamate nickel plating layer is provided on the negative pressure side gold plating layer, and a negative pressure side high-phosphorus chemical nickel plating layer is provided on the second sulfamate nickel plating layer on the negative pressure side; From top to bottom, the outer wall of the negative pressure side body is wavy, the negative pressure side base material layer is wavy, and the outer wall of the negative pressure side body and the negative pressure side base material layer rise and fall synchronously; A negative pressure side cavity is formed between the outer wall of the negative pressure side body and the negative pressure side base material layer, and a negative pressure side flow guide hole communicating with the negative pressure side cavity is opened in the negative pressure side body; The positive pressure side isolation diaphragm comprises a positive pressure side base material layer, a positive pressure side nickel plating layer, a positive pressure side first sulfamate nickel plating layer, a positive pressure side gold plating layer, a positive pressure side second sulfamate nickel plating layer and a positive pressure side high phosphorus chemical nickel plating layer; The positive pressure side base material layer is welded on the outer wall of the positive pressure side body, a positive pressure side nickel plating layer is provided on the positive pressure side base material layer, a positive pressure side first sulfamate nickel plating layer is provided on the positive pressure side nickel plating layer, a positive pressure side gold plating layer is provided on the first sulfamate nickel plating layer on the positive pressure side, a positive pressure side second sulfamate nickel plating layer is provided on the positive pressure side gold plating layer, and a positive pressure side high-phosphorus chemical nickel plating layer is provided on the second sulfamate nickel plating layer on the positive pressure side; From top to bottom, the outer wall of the positive pressure side body is wavy, the positive pressure side base material layer is wavy, and the outer wall of the positive pressure side body and the positive pressure side base material layer rise and fall synchronously; A positive pressure side cavity is formed between the outer wall of the positive pressure side body and the positive pressure side base material layer, and a positive pressure side flow guide hole communicating with the positive pressure side cavity is opened in the positive pressure side body.

[0005] Preferably, the negative pressure side base material layer is made of 316L stainless steel, Hastelloy or tantalum metal, and the distance between two adjacent wave peaks on the negative pressure side base material layer is 1.5-6 mm.

[0006] Preferably, the material of the positive pressure side base material layer is 316L stainless steel, Hastelloy or tantalum metal, and the distance between two adjacent wave peaks on the positive pressure side base material layer is 1.5-6 mm.

[0007] Preferably, the thickness of the negative pressure side base material layer and the positive pressure side base material layer are both 0.03-0.2mm, the thickness of the negative pressure side nickel plating layer and the positive pressure side nickel plating layer are both 2-3μm, the thickness of the first aminosulfonate nickel plating layer on the negative pressure side and the first aminosulfonate nickel plating layer on the positive pressure side are both 2-3μm, the thickness of the negative pressure side gold plating layer and the positive pressure side gold plating layer are both 2-5μm, the thickness of the second aminosulfonate nickel plating layer on the negative pressure side and the second aminosulfonate nickel plating layer on the positive pressure side are both 1-2μm, and the thickness of the high-phosphorus chemical nickel plating layer on the negative pressure side and the high-phosphorus chemical nickel plating layer on the positive pressure side are both 20-25μm.

[0008] The production method of the corrosion-resistant and wear-resistant pressure transmitter comprises the following steps: S1, welding the negative pressure side base material layer to the outer wall of the negative pressure side body, and welding the positive pressure side base material layer to the outer wall of the positive pressure side body; S2, putting water and electrolytic degreasing agent into an ultrasonic chemical degreasing tank to form an electrolytic degreasing liquid, adding 60-80g of electrolytic degreasing agent for every liter of water, the electrolytic degreasing agent is composed of sodium hydroxide, sodium silicate and sodium carbonate, the mass fraction of sodium hydroxide in the electrolytic degreasing agent is 60%-70%, the mass fraction of sodium silicate in the electrolytic degreasing agent is 20%-25%, and the mass fraction of sodium carbonate in the electrolytic degreasing agent is 10%-15%, the electrolytic degreasing liquid is heated to 55-65°C, the negative pressure side body and the positive pressure side body are placed in an ultrasonic chemical degreasing tank for ultrasonic electrolytic degreasing, and the ultrasonic electrolytic degreasing time is controlled at 5-10min; S3, soaking the negative pressure side body and the positive pressure side body after ultrasonic electrolytic degreasing in 60-80°C hot water for 20-30s, and then washing the negative pressure side body and the positive pressure side body with two-stage countercurrent water for 15-20s after hot water soaking; S4. Soak the washed negative pressure side body and positive pressure side body in a hydrochloric acid solution with a mass fraction of 10%-30% for 5-10 minutes; S5. Add water, nickel chloride and HCl into the plating tank to form a pre-nickel plating solution. Add 200-250g of nickel chloride per liter of water and 160-200ml of 37% HCl per liter of water. Control the temperature of the pre-nickel plating solution at 10-30°C. Place the negative pressure side body and the positive pressure side body into the plating tank for electroplating. Set the current density to 2-5A / dm 2 The electroplating time is controlled within 1-5 minutes. After electroplating, the negative pressure side body and the positive pressure side body are washed with two-stage countercurrent water for 15-20 seconds to form a negative pressure side nickel plating layer with a thickness of 2-3 μm on the negative pressure side base material layer, and a positive pressure side nickel plating layer with a thickness of 2-3 μm is formed on the positive pressure side base material layer; S6. Add water, nickel sulfamate, nickel chloride, boric acid and a wetting agent into a plating tank to form a nickel sulfamate plating solution, add 360-420 g of nickel sulfamate per liter of water, add 5-20 g of nickel chloride per liter of water, add 35-45 g of boric acid per liter of water, and add 0.3-1 g of a wetting agent per liter of water. Control the pH of the nickel sulfamate plating solution to 3.8-4.5, control the temperature of the nickel sulfamate plating solution to 50-60°C, put the negative pressure side body and the positive pressure side body into the plating tank for electroplating, and the current density during electroplating is 0.3-1A / dm 2 The electroplating time is controlled at 15-20 minutes. After electroplating, the negative pressure side body and the positive pressure side body are washed with two-stage countercurrent water for 15-30 seconds to form a negative pressure side first aminosulfonic acid nickel plating layer with a thickness of 2-3 μm on the negative pressure side nickel plating layer, and a positive pressure side first aminosulfonic acid nickel plating layer with a thickness of 2-3 μm is formed on the positive pressure side nickel plating layer; S7. Add pure water, potassium gold cyanide, a tank opening agent and cobalt concentrate into the plating tank to form a gold plating solution. Add 5-8g of potassium gold cyanide per liter of water, 700-800ml of a tank opening agent per liter of water, and 15-25ml of cobalt concentrate per liter of water. Control the temperature of the gold plating solution at 40-50°C, control the pH of the gold plating solution at 4.0-4.5, put the negative pressure side body and the positive pressure side body into the plating tank for electroplating, and control the current density at 0.5-2A / dm 2 , the time is controlled at 30-50min, after electroplating, the negative pressure side body and the positive pressure side body are washed by two-stage countercurrent water for 20-40s, and a negative pressure side gold plating layer with a thickness of 2-5μm is formed on the first aminosulfonic acid nickel plating layer on the negative pressure side, and a positive pressure side gold plating layer with a thickness of 2-5μm is formed on the first aminosulfonic acid nickel plating layer on the positive pressure side; S8. Add water, nickel sulfamate, nickel chloride, boric acid and a wetting agent into a plating tank to form a nickel sulfamate plating solution, add 360-420 g of nickel sulfamate per liter of water, add 5-20 g of nickel chloride per liter of water, add 35-45 g of boric acid per liter of water, and add 0.3-1 g of a wetting agent per liter of water. Control the pH of the nickel sulfamate plating solution to 3.8-4.5, control the temperature of the nickel sulfamate plating solution to 50-60°C, put the negative pressure side body and the positive pressure side body into the plating tank for electroplating, and the current density during electroplating is 0.3-1A / dm 2 The electroplating time is controlled at 15-20 minutes. After electroplating, the negative pressure side body and the positive pressure side body are washed with two-stage countercurrent water for 15-30 seconds to form a negative pressure side second aminosulfonic acid nickel plating layer with a thickness of 1-2 μm on the negative pressure side gold plating layer, and a positive pressure side second aminosulfonic acid nickel plating layer with a thickness of 1-2 μm is formed on the positive pressure side gold plating layer; S9. Add water, chemical nickel agent A and chemical nickel agent B into a plating tank to form a high-phosphorus chemical nickel plating solution, add 140-150 ml of chemical nickel agent A for every liter of water, and add 60-70 ml of chemical nickel agent B for every liter of water. The pH value of the high-phosphorus chemical nickel plating solution is controlled at 4.6-5.0, and the temperature of the high-phosphorus chemical nickel plating solution is controlled at 86-92°C. Put the negative pressure side body and the positive pressure side body into the plating tank for chemical nickel plating. The chemical nickel plating time is 120-150 minutes. After chemical nickel plating, a 20-25μm high-phosphorus chemical nickel plating layer is formed on the ammonia nickel plating layer. The isolation diaphragm assembly is washed with two-stage countercurrent water for 15-20s and then dried. A 20-25μm thick negative pressure side high-phosphorus chemical nickel plating layer is formed on the second aminosulfonic acid nickel plating layer on the negative pressure side, and a 20-25μm thick positive pressure side high-phosphorus chemical nickel plating layer is formed on the second aminosulfonic acid nickel plating layer on the positive pressure side.

[0009] Preferably, in step S6, the wetting agent is sodium dodecyl sulfate.

[0010] Preferably, in step S8, the wetting agent is sodium dodecyl sulfate.

[0011] The present invention adopts the wear-resistant and corrosion-resistant negative pressure side isolation diaphragm and positive pressure side isolation diaphragm, which can reduce corrosion and wear during use, greatly prolong the service life of the present invention, and is very suitable for use in black water. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the present invention.

[0013] Figure 2 It is a schematic structural diagram of the negative pressure side isolation diaphragm in the present invention.

[0014] Figure 3 It is a schematic structural diagram of the positive pressure side isolation diaphragm in the present invention. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 those skilled in the art without creative work are within the scope of protection of the present invention.

[0016] A corrosion-resistant and wear-resistant pressure transmitter, such as Figure 1-3 As shown, it comprises a negative pressure side body 1, a positive pressure side body 2, a negative pressure side isolation diaphragm 3 and a positive pressure side isolation diaphragm 4, and the negative pressure side body 1 and the positive pressure side body 2 are fixed together; The negative pressure side isolation diaphragm 3 comprises a negative pressure side base material layer 31, a negative pressure side nickel plating layer 32, a negative pressure side first sulfamate nickel plating layer 33, a negative pressure side gold plating layer 34, a negative pressure side second sulfamate nickel plating layer 35 and a negative pressure side high-phosphorus chemical nickel plating layer 36; The negative pressure side base material layer 31 is welded on the outer wall of the negative pressure side body 1, a negative pressure side nickel plating layer 32 is provided on the negative pressure side base material layer 31, a negative pressure side first aminosulfonate nickel plating layer 33 is provided on the negative pressure side nickel plating layer 32, a negative pressure side gold plating layer 34 is provided on the negative pressure side first aminosulfonate nickel plating layer 33, a negative pressure side second aminosulfonate nickel plating layer 35 is provided on the negative pressure side gold plating layer 34, and a negative pressure side high-phosphorus chemical nickel plating layer 36 is provided on the negative pressure side second aminosulfonate nickel plating layer 35; From top to bottom, the outer wall of the negative pressure side body 1 is wavy, the negative pressure side base material layer 31 is wavy, and the outer wall of the negative pressure side body 1 and the negative pressure side base material layer 31 rise and fall synchronously; A negative pressure side cavity 11 is formed between the outer wall of the negative pressure side body 1 and the negative pressure side base material layer 31, and a negative pressure side flow guide hole 12 communicating with the negative pressure side cavity 11 is opened in the negative pressure side body 1; The positive pressure side isolation diaphragm 4 comprises a positive pressure side base material layer 41, a positive pressure side nickel plating layer 42, a positive pressure side first sulfamate nickel plating layer 43, a positive pressure side gold plating layer 44, a positive pressure side second sulfamate nickel plating layer 45 and a positive pressure side high phosphorus chemical nickel plating layer 46; The positive pressure side base material layer 41 is welded on the outer wall of the positive pressure side body 2, a positive pressure side nickel plating layer 42 is provided on the positive pressure side base material layer 41, a positive pressure side first aminosulfonate nickel plating layer 43 is provided on the positive pressure side nickel plating layer 42, a positive pressure side gold plating layer 44 is provided on the positive pressure side first aminosulfonate nickel plating layer 43, a positive pressure side second aminosulfonate nickel plating layer 45 is provided on the positive pressure side gold plating layer 44, and a positive pressure side high-phosphorus chemical nickel plating layer 46 is provided on the positive pressure side second aminosulfonate nickel plating layer 45; From top to bottom, the outer wall of the positive pressure side body 2 is wavy, the positive pressure side base material layer 41 is wavy, and the outer wall of the positive pressure side body 2 and the positive pressure side base material layer 41 rise and fall synchronously; A positive pressure side cavity 21 is formed between the outer wall of the positive pressure side body 2 and the positive pressure side base material layer 41 , and a positive pressure side flow guide hole 22 communicating with the positive pressure side cavity 21 is provided in the positive pressure side body 2 .

[0017] The negative pressure side base material layer 31 is made of 316L stainless steel, Hastelloy or tantalum metal, and the distance between two adjacent wave peaks on the negative pressure side base material layer 31 is 1.5-6 mm.

[0018] The material of the positive pressure side base material layer 41 is 316L stainless steel, Hastelloy or tantalum metal, and the distance between two adjacent wave peaks on the positive pressure side base material layer 41 is 1.5-6 mm.

[0019] The thickness of the negative pressure side base material layer 31 and the positive pressure side base material layer 41 are both 0.03-0.2mm, the thickness of the negative pressure side nickel plating layer 32 and the positive pressure side nickel plating layer 42 are both 2-3μm, the thickness of the first aminosulfonate nickel plating layer 33 on the negative pressure side and the first aminosulfonate nickel plating layer 43 on the positive pressure side are both 2-3μm, the thickness of the negative pressure side gold plating layer 34 and the positive pressure side gold plating layer 44 are both 2-5μm, the thickness of the second aminosulfonate nickel plating layer 35 on the negative pressure side and the second aminosulfonate nickel plating layer 45 on the positive pressure side are both 1-2μm, and the thickness of the negative pressure side high-phosphorus chemical nickel plating layer 36 and the positive pressure side high-phosphorus chemical nickel plating layer 46 are both 20-25μm.

[0020] Since the outermost side of the negative pressure side isolation diaphragm 3 is the negative pressure side high phosphorus chemical nickel plating layer 36, and the outermost side of the positive pressure side isolation diaphragm 4 is the positive pressure side high phosphorus chemical nickel plating layer 46, the high phosphorus chemical nickel plating layer has the following properties: 1. High hardness: The hardness of high-phosphorus chemical nickel plating can reach 400-700HV.

[0021] 2. Good wear resistance: usually presenting an amorphous structure, the negative pressure side high phosphorus chemical nickel plating layer 36 and the positive pressure side high phosphorus chemical nickel plating layer 46 have extremely high wear resistance and scratch resistance. According to the test of British Telecom Standard M468A, the base substrate is not exposed on the metal plate and the probe.

[0022] 3. Good corrosion resistance: High-phosphorus chemical nickel plating can exist stably in alkaline and acidic environments, and the neutral salt spray can reach more than 1000 hours. The plating has low porosity, excellent density and good corrosion resistance.

[0023] Since the high-phosphorus chemical nickel plating has high hardness, good wear resistance and good corrosion resistance, it can reduce the corrosion and wear of the negative pressure side isolation diaphragm 3 and the positive pressure side isolation diaphragm 4 during use, greatly extending the service life of the present invention.

[0024] The cylinder opening agent used in the following production method is provided by Rohm and Haas Company of the United States, and the product model is Ronovel CM.

[0025] The cobalt concentrate used in the following production method is provided by Rohm and Haas Company of the United States, and the product model is Ronovel CM.

[0026] The chemical nickel agent A used in the following production method is provided by Zhongshan Bomei New Material Technology Co., Ltd., and the product name is chemical nickel HPNIE-380.

[0027] The chemical nickel B agent used in the following production method is provided by Zhongshan Bomei New Material Technology Co., Ltd., and the product name is chemical nickel HPNIE-381.

[0028] The production method of the above-mentioned corrosion-resistant and wear-resistant pressure transmitter comprises the following steps: S1, welding the negative pressure side base material layer 31 to the outer wall of the negative pressure side body 1, and welding the positive pressure side base material layer 41 to the outer wall of the positive pressure side body 2; S2, putting water and electrolytic degreasing agent into an ultrasonic chemical degreasing tank to form an electrolytic degreasing liquid, adding 60-80g of electrolytic degreasing agent for every liter of water, the electrolytic degreasing agent is composed of sodium hydroxide, sodium silicate and sodium carbonate, the mass fraction of sodium hydroxide in the electrolytic degreasing agent is 60%-70%, the mass fraction of sodium silicate in the electrolytic degreasing agent is 20%-25%, and the mass fraction of sodium carbonate in the electrolytic degreasing agent is 10%-15%, the electrolytic degreasing liquid is heated to 55-65°C, the negative pressure side body 1 and the positive pressure side body 2 are placed in an ultrasonic chemical degreasing tank for ultrasonic electrolytic degreasing, and the ultrasonic electrolytic degreasing time is controlled at 5-10min to remove grease on the outer surfaces of the negative pressure side base material layer 31 and the positive pressure side base material layer 41; S3, soaking the negative pressure side body 1 and the positive pressure side body 2 after ultrasonic electrolytic degreasing in 60-80°C hot water for 20-30s, and then washing the negative pressure side body 1 and the positive pressure side body 2 with two-stage countercurrent water for 15-20s to clean the electrolytic degreasing liquid remaining on the outer surface of the negative pressure side base material layer 31 and the positive pressure side base material layer 41; S4, soaking the washed negative pressure side body 1 and positive pressure side body 2 in a hydrochloric acid solution with a mass fraction of 10%-30% for 5-10 minutes to remove the oxide film on the outer surface of the negative pressure side base material layer 31 and the positive pressure side base material layer 41; S5. Add water, nickel chloride and HCl into the plating tank to form a pre-nickel plating solution, add 200-250g of nickel chloride per liter of water, and add 160-200ml of 37% HCl per liter of water. Control the temperature of the pre-nickel plating solution at 10-30°C, put the negative pressure side body 1 and the positive pressure side body 2 into the plating tank for electroplating, and set the current density to 2-5A / dm 2 , the electroplating time is controlled within 1-5min, after electroplating, the negative pressure side body 1 and the positive pressure side body 2 are subjected to two-stage countercurrent water washing for 15-20s, a negative pressure side nickel plating layer 32 with a thickness of 2-3μm is formed on the negative pressure side base material layer 31, and a positive pressure side nickel plating layer 42 with a thickness of 2-3μm is formed on the positive pressure side base material layer 41, the bonding force between the negative pressure side nickel plating layer 32 and the negative pressure side base material layer 31 is relatively high, and the bonding force between the positive pressure side nickel plating layer 42 and the positive pressure side base material layer 41 is relatively high; S6. Add water, nickel sulfamate, nickel chloride, boric acid and a wetting agent into a plating tank to form a nickel sulfamate plating solution. Add 360-420 g of nickel sulfamate per liter of water, 5-20 g of nickel chloride per liter of water, 35-45 g of boric acid per liter of water, and 0.3-1 g of a wetting agent per liter of water. The wetting agent is sodium dodecyl sulfate. Control the pH of the nickel sulfamate plating solution to 3.8-4.5, and control the temperature of the nickel sulfamate plating solution to 50-60°C. Place the negative pressure side body 1 and the positive pressure side body 2 into the plating tank for electroplating. The current density during electroplating is 0.3-1A / dm 2 The electroplating time is controlled at 15-20min. After electroplating, the negative pressure side body 1 and the positive pressure side body 2 are washed with two-stage countercurrent water for 15-30s, and a negative pressure side first aminosulfonate nickel plating layer 33 with a thickness of 2-3μm is formed on the negative pressure side nickel plating layer 32, and a positive pressure side first aminosulfonate nickel plating layer 43 with a thickness of 2-3μm is formed on the positive pressure side nickel plating layer 42. The uniformity and glossiness of the negative pressure side first aminosulfonate nickel plating layer 33 and the positive pressure side first aminosulfonate nickel plating layer 43 are both high; S7, add pure water, potassium gold cyanide, a tank opening agent and cobalt concentrate into the plating tank to form a gold plating solution, add 5-8g of potassium gold cyanide per liter of water, add 700-800ml of a tank opening agent per liter of water, add 15-25ml of cobalt concentrate per liter of water, control the temperature of the gold plating solution at 40-50°C, control the pH of the gold plating solution at 4.0-4.5, put the negative pressure side body 1 and the positive pressure side body 2 into the plating tank for electroplating, and control the current density at 0.5-2A / dm 2 , the time is controlled at 30-50min, after electroplating, the negative pressure side body 1 and the positive pressure side body 2 are washed by two-stage countercurrent water for 20-40s, and a negative pressure side gold plating layer 34 with a thickness of 2-5μm is formed on the first aminosulfonic acid nickel plating layer 33 on the negative pressure side, and a positive pressure side gold plating layer 44 with a thickness of 2-5μm is formed on the first aminosulfonic acid nickel plating layer 43 on the positive pressure side. The negative pressure side gold plating layer 34 and the positive pressure side gold plating layer 44 have high corrosion resistance; S8, adding water, nickel sulfamate, nickel chloride, boric acid and a wetting agent into a plating tank to form a nickel sulfamate plating solution, adding 360-420g of nickel sulfamate per liter of water, 5-20g of nickel chloride per liter of water, 35-45g of boric acid per liter of water, and 0.3-1g of a wetting agent per liter of water, wherein the wetting agent is sodium dodecyl sulfate, and the pH value of the nickel sulfamate plating solution is controlled at 3.8-4.5, and the temperature of the nickel sulfamate plating solution is controlled at 50-60°C, and the negative pressure side body 1 and the positive pressure side body 2 are placed in the plating tank for electroplating, and the current density during electroplating is 0.3-1A / dm 2The electroplating time is controlled at 15-20min. After electroplating, the negative pressure side body 1 and the positive pressure side body 2 are washed with two-stage countercurrent water for 15-30s, and a negative pressure side second aminosulfonic acid nickel plating layer 35 with a thickness of 1-2μm is formed on the negative pressure side gold plating layer 34, and a positive pressure side second aminosulfonic acid nickel plating layer 45 with a thickness of 1-2μm is formed on the positive pressure side gold plating layer 44. The uniformity and glossiness of the negative pressure side second aminosulfonic acid nickel plating layer 35 and the positive pressure side second aminosulfonic acid nickel plating layer 45 are both high; S9, add water, chemical nickel agent A and chemical nickel agent B into the plating tank to form a high-phosphorus chemical nickel plating solution, add 140-150 ml of chemical nickel agent A per liter of water, add 60-70 ml of chemical nickel agent B per liter of water, control the pH of the high-phosphorus chemical nickel plating solution at 4.6-5.0, and control the temperature of the high-phosphorus chemical nickel plating solution at 86-92°C, put the negative pressure side body 1 and the positive pressure side body 2 into the plating tank for chemical nickel plating, and The time is 120-150min. After chemical nickel plating, a high-phosphorus chemical nickel plating layer of 20-25μm is formed on the ammonia nickel plating layer. The isolation diaphragm assembly is washed with two-stage countercurrent water for 15-20s and then dried. A negative-pressure side high-phosphorus chemical nickel plating layer 36 with a thickness of 20-25μm is formed on the second aminosulfonic acid nickel plating layer 35 on the negative-pressure side. A positive-pressure side high-phosphorus chemical nickel plating layer 46 with a thickness of 20-25μm is formed on the second aminosulfonic acid nickel plating layer 45 on the positive-pressure side.

[0029] High-phosphorus chemical nickel plating has the characteristics of high hardness, good wear resistance and good corrosion resistance, and is very suitable for use in black water (black water mainly refers to a solid-liquid mixture with coal slag formed in the gas system, most of which is liquid).

[0030] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A corrosion-resistant and wear-resistant pressure transmitter, characterized by: It comprises a negative pressure side body (1), a positive pressure side body (2), a negative pressure side isolation diaphragm (3) and a positive pressure side isolation diaphragm (4); the negative pressure side body (1) and the positive pressure side body (2) are fixed together; The negative pressure side isolation diaphragm (3) comprises a negative pressure side base material layer (31), a negative pressure side nickel plating layer (32), a negative pressure side first sulfamate nickel plating layer (33), a negative pressure side gold plating layer (34), a negative pressure side second sulfamate nickel plating layer (35) and a negative pressure side high-phosphorus chemical nickel plating layer (36); The negative pressure side base material layer (31) is welded to the outer wall of the negative pressure side body (1); a negative pressure side nickel plating layer (32) is provided on the negative pressure side base material layer (31); a negative pressure side first aminosulfonate nickel plating layer (33) is provided on the negative pressure side nickel plating layer (32); a negative pressure side gold plating layer (34) is provided on the first aminosulfonate nickel plating layer (33); a negative pressure side second aminosulfonate nickel plating layer (35) is provided on the negative pressure side gold plating layer (34); and a negative pressure side high-phosphorus chemical nickel plating layer (36) is provided on the second aminosulfonate nickel plating layer (35); In a direction from top to bottom, the outer wall of the negative pressure side body (1) is wavy, the negative pressure side base material layer (31) is wavy, and the outer wall of the negative pressure side body (1) and the negative pressure side base material layer (31) rise and fall synchronously; A negative pressure side cavity (11) is formed between the outer wall of the negative pressure side body (1) and the negative pressure side base material layer (31), and a negative pressure side flow guide hole (12) communicating with the negative pressure side cavity (11) is provided in the negative pressure side body (1); The positive pressure side isolation diaphragm (4) comprises a positive pressure side base material layer (41), a positive pressure side nickel plating layer (42), a positive pressure side first sulfamate nickel plating layer (43), a positive pressure side gold plating layer (44), a positive pressure side second sulfamate nickel plating layer (45) and a positive pressure side high-phosphorus chemical nickel plating layer (46); The positive pressure side base material layer (41) is welded to the outer wall of the positive pressure side body (2); a positive pressure side nickel plating layer (42) is provided on the positive pressure side base material layer (41); a positive pressure side first aminosulfonate nickel plating layer (43) is provided on the positive pressure side nickel plating layer (42); a positive pressure side gold plating layer (44) is provided on the positive pressure side first aminosulfonate nickel plating layer (43); a positive pressure side second aminosulfonate nickel plating layer (45) is provided on the positive pressure side gold plating layer (44); and a positive pressure side high-phosphorus chemical nickel plating layer (46) is provided on the positive pressure side second aminosulfonate nickel plating layer (45); In a direction from top to bottom, the outer wall of the positive pressure side body (2) is wavy, the positive pressure side base material layer (41) is wavy, and the outer wall of the positive pressure side body (2) and the positive pressure side base material layer (41) rise and fall synchronously; A positive pressure side cavity (21) is formed between the outer wall of the positive pressure side body (2) and the positive pressure side base material layer (41), and a positive pressure side flow guide hole (22) communicating with the positive pressure side cavity (21) is provided in the positive pressure side body (2).

2. The corrosion-resistant and wear-resistant pressure transmitter according to claim 1, characterized in that: The negative pressure side base material layer (31) is made of 316L stainless steel, Hastelloy or tantalum metal, and the distance between two adjacent wave peaks on the negative pressure side base material layer (31) is 1.5-6 mm.

3. The corrosion-resistant and wear-resistant pressure transmitter according to claim 1, characterized in that: The material of the positive pressure side base material layer (41) is 316L stainless steel, Hastelloy or tantalum metal, and the distance between two adjacent wave peaks on the positive pressure side base material layer (41) is 1.5-6 mm.

4. The corrosion-resistant and wear-resistant pressure transmitter according to claim 1, characterized in that: The thickness of the negative pressure side base material layer (31) and the positive pressure side base material layer (41) are both 0.03-0.2 mm, the thickness of the negative pressure side nickel plating layer (32) and the positive pressure side nickel plating layer (42) are both 2-3 μm, the thickness of the negative pressure side first sulfamate nickel plating layer (33) and the positive pressure side first sulfamate nickel plating layer (43) are both 2-3 μm, the thickness of the negative pressure side gold plating layer (34) and the positive pressure side gold plating layer (44) are both 2-5 μm, the thickness of the negative pressure side second sulfamate nickel plating layer (35) and the positive pressure side second sulfamate nickel plating layer (45) are both 1-2 μm, and the thickness of the negative pressure side high-phosphorus chemical nickel plating layer (36) and the positive pressure side high-phosphorus chemical nickel plating layer (46) are both 20-25 μm.

5. The method for producing a corrosion-resistant and wear-resistant pressure transmitter according to any one of claims 1 to 4, characterized in that The production method comprises the following steps: S1, welding the negative pressure side base material layer (31) to the outer wall of the negative pressure side body (1), and welding the positive pressure side base material layer (41) to the outer wall of the positive pressure side body (2); S2, placing water and an electrolytic degreasing agent into an ultrasonic chemical degreasing tank to form an electrolytic degreasing liquid, adding 60-80 g of the electrolytic degreasing agent per liter of water, the electrolytic degreasing agent consisting of sodium hydroxide, sodium silicate and sodium carbonate, the mass fraction of sodium hydroxide in the electrolytic degreasing agent being 60%-70%, the mass fraction of sodium silicate in the electrolytic degreasing agent being 20%-25%, and the mass fraction of sodium carbonate in the electrolytic degreasing agent being 10%-15%, heating the electrolytic degreasing liquid to 55-65° C., placing the negative pressure side body (1) and the positive pressure side body (2) into an ultrasonic chemical degreasing tank for ultrasonic electrolytic degreasing, and controlling the ultrasonic electrolytic degreasing time to be 5-10 min; S3, soaking the negative pressure side body (1) and the positive pressure side body (2) after ultrasonic electrolytic degreasing in 60-80°C hot water for 20-30 seconds, and then washing the negative pressure side body (1) and the positive pressure side body (2) with two-stage countercurrent water for 15-20 seconds; S4, soaking the washed negative pressure side body (1) and the positive pressure side body (2) in a hydrochloric acid solution with a mass fraction of 10% to 30% for 5 to 10 minutes; S5. Add water, nickel chloride and HCl into a plating tank to form a pre-nickel plating solution, add 200-250 g of nickel chloride per liter of water, and add 160-200 ml of 37% HCl per liter of water. Control the temperature of the pre-nickel plating solution at 10-30° C. Place the negative pressure side body (1) and the positive pressure side body (2) into the plating tank for electroplating. Set the current density to 2-5 A / dm 2 The electroplating time is controlled within 1-5 minutes. After the electroplating, the negative pressure side body (1) and the positive pressure side body (2) are subjected to two-stage countercurrent water washing for 15-20 seconds to form a negative pressure side nickel plating layer (32) with a thickness of 2-3 μm on the negative pressure side base material layer (31), and a positive pressure side nickel plating layer (42) with a thickness of 2-3 μm is formed on the positive pressure side base material layer (41); S6. Add water, nickel sulfamate, nickel chloride, boric acid and a wetting agent into a plating tank to form a nickel sulfamate plating solution. Add 360-420 g of nickel sulfamate per liter of water, 5-20 g of nickel chloride per liter of water, 35-45 g of boric acid per liter of water, and 0.3-1 g of a wetting agent per liter of water. Control the pH of the nickel sulfamate plating solution to 3.8-4.5, and control the temperature of the nickel sulfamate plating solution to 50-60° C. Place the negative pressure side body (1) and the positive pressure side body (2) into the plating tank for electroplating. The current density during electroplating is 0.3-1 A / dm 2 The electroplating time is controlled within 15-20 minutes. After the electroplating, the negative pressure side body (1) and the positive pressure side body (2) are washed with two-stage countercurrent water for 15-30 seconds to form a negative pressure side first aminosulfonic acid nickel plating layer (33) with a thickness of 2-3 μm on the negative pressure side nickel plating layer (32), and a positive pressure side first aminosulfonic acid nickel plating layer (43) with a thickness of 2-3 μm is formed on the positive pressure side nickel plating layer (42); S7. Add pure water, potassium gold cyanide, a tank opening agent and cobalt concentrate into a plating tank to form a gold plating solution. Add 5-8 g of potassium gold cyanide per liter of water, add 700-800 ml of a tank opening agent per liter of water, and add 15-25 ml of cobalt concentrate per liter of water. Control the temperature of the gold plating solution at 40-50°C, control the pH of the gold plating solution at 4.0-4.5, place the negative pressure side body (1) and the positive pressure side body (2) into the plating tank for electroplating, and control the current density at 0.5-2A / dm 2 , the time is controlled to be 30-50 minutes, after electroplating, the negative pressure side body (1) and the positive pressure side body (2) are subjected to two-stage countercurrent water washing for 20-40 seconds, and a negative pressure side gold plating layer (34) with a thickness of 2-5 μm is formed on the first aminosulfonic acid nickel plating layer (33) on the negative pressure side, and a positive pressure side gold plating layer (44) with a thickness of 2-5 μm is formed on the first aminosulfonic acid nickel plating layer (43) on the positive pressure side; S8. Add water, nickel sulfamate, nickel chloride, boric acid and a wetting agent into a plating tank to form a nickel sulfamate plating solution. Add 360-420 g of nickel sulfamate per liter of water, 5-20 g of nickel chloride per liter of water, 35-45 g of boric acid per liter of water, and 0.3-1 g of a wetting agent per liter of water. Control the pH of the nickel sulfamate plating solution to 3.8-4.5, and control the temperature of the nickel sulfamate plating solution to 50-60° C. Place the negative pressure side body (1) and the positive pressure side body (2) into the plating tank for electroplating. The current density during electroplating is 0.3-1 A / dm 2 The electroplating time is controlled within 15-20 minutes. After the electroplating, the negative pressure side body (1) and the positive pressure side body (2) are washed with two-stage countercurrent water for 15-30 seconds to form a negative pressure side second aminosulfonic acid nickel plating layer (35) with a thickness of 1-2 μm on the negative pressure side gold plating layer (34), and a positive pressure side second aminosulfonic acid nickel plating layer (45) with a thickness of 1-2 μm is formed on the positive pressure side gold plating layer (44); S9, adding water, chemical nickel agent A and chemical nickel agent B into a plating tank to form a high-phosphorus chemical nickel plating solution, adding 140-150 ml of chemical nickel agent A per liter of water, adding 60-70 ml of chemical nickel agent B per liter of water, controlling the pH of the high-phosphorus chemical nickel plating solution at 4.6-5.0, and controlling the temperature of the high-phosphorus chemical nickel plating solution at 86-92°C, placing the negative pressure side body (1) and the positive pressure side body (2) into the plating tank for chemical nickel plating, and the chemical nickel plating time The process is carried out for 120-150 minutes. After chemical nickel plating, a high-phosphorus chemical nickel plating layer of 20-25 μm is formed on the ammonia nickel plating layer. The isolation diaphragm assembly is washed with two-stage countercurrent water for 15-20 seconds and then dried. A negative-pressure side high-phosphorus chemical nickel plating layer (36) of 20-25 μm thickness is formed on the second aminosulfonic acid nickel plating layer (35) on the negative-pressure side. A positive-pressure side high-phosphorus chemical nickel plating layer (46) of 20-25 μm thickness is formed on the second aminosulfonic acid nickel plating layer (45) on the positive-pressure side.

6. The method for producing a corrosion-resistant and wear-resistant pressure transmitter according to claim 5, characterized in that: In step S6, the wetting agent is sodium lauryl sulfate.

7. The method for producing a corrosion-resistant and wear-resistant pressure transmitter according to claim 5, characterized in that: In step S8, the wetting agent is sodium lauryl sulfate.

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