Corrosion-resistant composite pipe thread brush plating layer and preparation method thereof

Abstract

The present application relates to the technical field of composite pipe thread brush plating layer, and particularly relates to a corrosion-resistant composite pipe thread brush plating layer and a preparation method thereof.A corrosion-resistant composite pipe thread brush plating layer comprises a bottom nickel layer, the bottom nickel layer is arranged on the surface of the composite pipe thread, the thickness of the bottom nickel layer is 1.0-2.0 microns, and a nickel-tungsten layer, the nickel-tungsten layer is arranged on the upper surface of the bottom nickel layer, and the thickness of the nickel-tungsten layer is 10-15 microns.The present application optimizes the composition structure of the corrosion-resistant composite pipe thread brush plating layer, adopts the structure of the double plating layer of the bottom nickel layer and the nickel-tungsten layer, instead of the technical scheme of the traditional single plating layer, since the nickel-tungsten amorphous alloy plating layer has the same structure, the chemical composition is uniform, so in the actual use process, the passivation protective layer is easy to appear, the corrosion-resistant anions in the external corrosion medium are effectively prevented from passing through the corrosion film through the formed amorphous passivation protective layer, and the phenomenon that the composite pipe thread is corroded is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of composite pipe thread brush plating, in particular to a corrosion-resistant composite pipe thread brush plating and a preparation method thereof. BACKGROUND

[0002] A composite pipe is usually composed of different metal materials. A multi-metal composite pipe retains the respective advantages of a base pipe and a cladding metal, and the cost of the pipe material is only 1 / 5-1 / 2 of that of a pure corrosion-resistant alloy pipe. Compared with a pure alloy pipe, a double-metal composite pipe can also improve safety and reliability in a chloride-containing and / or acidic environment. Compared with a mechanically composite pipe, a metallurgically composite pipe has a metallurgical bonding surface between the two metals, and the bonding strength is high. Main metallurgical composite forming processes include hot extrusion, hot rolling, centrifugal casting, explosive welding and powder metallurgy.

[0003] In order to enhance the corrosion resistance of the composite pipe, the thread part of the composite pipe is usually subjected to brush plating treatment. Brush plating is an electrochemical treatment method. A uniform and dense metal or alloy plating layer is formed on the metal surface by applying an electric current to the metal surface, thereby providing excellent corrosion resistance. This method is often used to improve the hardness, wear resistance, corrosion resistance and appearance quality of the metal surface.

[0004] With respect to the above related technology, the inventors have found that the thread part of the composite pipe now only has a single plating layer structure. In actual use, due to contact, the plating layer is prone to fall off, resulting in cracking of the plating layer of the thread part of the composite pipe, thereby reducing the corrosion resistance of the thread part of the composite pipe. SUMMARY

[0005] In order to improve the poor corrosion-resistant plating layer performance of the thread part of the composite pipe, the present application provides a corrosion-resistant composite pipe thread brush plating layer and a preparation method thereof.

[0006] In a first aspect, the present application provides a corrosion-resistant composite pipe thread brush plating layer, which adopts the following technical solution:

[0007] A corrosion-resistant composite pipe thread brush plating layer comprises:

[0008] A bottom nickel layer is arranged on the surface of the thread part of the composite pipe, and the thickness of the bottom nickel layer is 1.0-2.0 μm.

[0009] A nickel-tungsten layer is arranged on the upper surface of the bottom nickel layer, and the thickness of the nickel-tungsten layer is 10-15 μm.

[0010] By the technical scheme, the composition structure of the corrosion-resistant composite pipe thread brush plating layer is optimized, the double-layer structure of the bottom nickel layer and the nickel-tungsten layer is adopted, and the traditional single-layer technical scheme is replaced. Since the nickel-tungsten amorphous alloy plating layer has a homogeneous structure, the chemical composition is uniform, and therefore, in actual use, a passivation protective layer is easily formed. The passivation protective layer formed by the amorphous state effectively prevents the corrosive anions in the external corrosive medium from passing through the corrosion film, thereby avoiding the corrosion of the composite pipe thread.

[0011] On this basis, the composite pipe thread is subjected to brush plating treatment, the metal nickel is used as the bottom layer to block the diffusion of the metal elements in the base material to the surface, and the relatively inert nickel is used to further improve the corrosion resistance of the composite pipe thread brush plating layer. Meanwhile, compared with the traditional single-layer plating layer, the multi-layer plating layer combined technical scheme is selected, the nickel is used as the bottom layer, the good adhesion and strength of the nickel are utilized, and the cracking problem between the plating layer and the base body due to poor strength is improved, thereby further improving the corrosion-resistant service life of the composite pipe thread.

[0012] Further, the corrosion-resistant composite pipe thread brush plating layer further comprises:

[0013] A copper plating layer is arranged between the bottom nickel layer and the nickel-tungsten layer, and the copper plating layer is formed into a metal copper layer with a thickness of 4.0-6.0 μm.

[0014] By the technical scheme, the composition structure of the corrosion-resistant composite pipe thread brush plating layer is further optimized. On the one hand, the copper and the bottom nickel layer surface form a good metal bonding effect, the stability of the plating layer is improved, and the copper has good corrosion resistance, thereby further improving the corrosion resistance of the composite pipe thread. On the other hand, the copper in the copper plating layer is a cubic crystal, has good sliding performance and ductility, and can effectively slide and relieve stress concentration when the copper plating layer is subjected to external force in actual use, thereby improving the anti-cracking performance of the corrosion-resistant composite pipe thread brush plating layer in use, and further improving the corrosion-resistant service life of the corrosion-resistant composite pipe thread brush plating layer.

[0015] Further, a fast nickel layer is arranged between the copper plating layer and the nickel-tungsten layer, and the fast nickel layer is formed into a metal nickel layer with a thickness of 10-15 μm.

[0016] Secondly, the application provides a preparation method of a corrosion-resistant composite pipe thread brush plating layer, which adopts the following technical scheme:

[0017] The preparation method of the corrosion-resistant composite pipe thread brush plating layer comprises the following preparation steps:

[0018] The base material is subjected to electrocleaning treatment, and then is subjected to activation treatment.

[0019] The bottom nickel layer is prepared by using a bottom nickel electroplating solution to electro-brush plate the surface of the activated substrate in a positive connection mode;

[0020] The copper plating layer is prepared by using a copper plating electroplating solution to electro-brush plate the surface of the substrate with the bottom nickel layer in a positive connection mode;

[0021] The fast nickel layer is prepared by using a fast nickel electroplating solution to electro-brush plate the surface of the substrate with the copper plating layer in a positive connection mode;

[0022] The nickel tungsten layer is prepared by using a nickel tungsten electroplating solution to electro-brush plate the surface of the substrate with the fast nickel layer in a positive connection mode, and the corrosion-resistant composite pipe thread electro-brush plated layer is prepared after the electroplating is completed.

[0023] By the above technical solutions, the parameters and steps of the electro-brush plating treatment are optimized, the prepared corrosion-resistant composite pipe thread electro-brush plated layer has good corrosion resistance and crack resistance.

[0024] Further, the bottom nickel electroplating solution comprises the following substances by weight: nickel sulfate 250-400 parts;

[0025] Nickel chloride 10-20 parts; hydrochloric acid 15-30 parts; acetic acid 65-85 parts.

[0026] Further, the copper plating electroplating solution comprises the following substances by weight: copper chloride 45-70 parts;

[0027] Potassium hydroxide 15-30 parts; additive 3-5 parts.

[0028] Further, the fast nickel electroplating solution comprises the following substances by weight: nickel sulfate 300-350 parts; sodium chloride 35-60 parts; H3BO3 15-45 parts; additive 0.1-0.5 parts.

[0029] Further, the nickel tungsten electroplating solution comprises the following substances by weight: nickel sulfate 300-450 parts; sodium tungstate 20-40 parts; H3BO3 15-45 parts; citric acid 35-50 parts.

[0030] In summary, the present application has the following beneficial effects:

[0031] Firstly, the application optimizes the composition structure of the corrosion-resistant composite pipe thread brush plating layer, adopts the structure of double plating layers of a bottom nickel layer and a nickel-tungsten layer, instead of the traditional single plating layer technical solution. Since the nickel-tungsten amorphous alloy plating layer has a homogeneous structure, its chemical composition is uniform, so in actual use, a passivation protective layer is easily formed, which effectively prevents the corrosive anions in the external corrosive medium from passing through the corrosion film, thereby avoiding the corrosion of the composite pipe thread.

[0032] On this basis, the application performs brush plating treatment on the composite pipe thread, blocks the diffusion of metal elements in the base material to the surface by taking metal nickel as the bottom layer, and further improves the corrosion resistance of the composite pipe thread brush plating layer by using the relative inertness of nickel. Meanwhile, compared with the traditional single-layer plating layer, the application selects the technical solution of a multi-layer plating layer combination, takes nickel as the bottom layer, uses its good adhesion and strength to improve the poor strength between the plating layer and the base body and solve the problem of cracking, thereby further improving the corrosion-resistant service life of the composite pipe thread.

[0033] Secondly, the application further optimizes the composition structure of the corrosion-resistant composite pipe thread brush plating layer. On the one hand, copper and the bottom nickel layer form a good metal bonding effect on the surface, which improves the stability of the plating layer, and copper has good corrosion resistance, which further improves the corrosion resistance of the composite pipe thread. On the other hand, the copper in the copper plating layer is a cubic crystal with good sliding and ductility. In actual use, when the copper plating layer is subjected to external force, it can effectively slide and relieve stress concentration, thereby improving the anti-cracking performance of the corrosion-resistant composite pipe thread brush plating layer in use, and further improving the corrosion-resistant service life of the corrosion-resistant composite pipe thread brush plating layer.

[0034] Thirdly, the application optimizes the parameters and steps of the brush plating treatment, so that the prepared corrosion-resistant composite pipe thread brush plating layer has good corrosion resistance and anti-cracking performance. DETAILED DESCRIPTION

[0035] The application will be further described in detail below in combination with examples.

[0036] Preparation Example 1

[0037] Bottom nickel electroplating solution 1

[0038] A bottom nickel electroplating solution 1 is prepared by adding water to make up to 1 L after adding 250 g / L nickel sulfate, 10 g / L nickel chloride, 15 g / L HCl and 65 g / L acetic acid.

[0039] Preparation Example 2

[0040] Bottom nickel electroplating solution 2

[0041] Prepare a base nickel plating solution 2 by adding water to a final volume of 1L, using 310g / L nickel sulfate, 15g / L nickel chloride, 22g / L HCl and 70g / L acetic acid.

[0042] Preparation Example 3

[0043] Nickel plating solution 3

[0044] Prepare a base nickel plating solution 3 by adding water to a final volume of 1L, using 400g / L nickel sulfate, 20g / L nickel chloride, 30g / L HCl and 85g / L acetic acid.

[0045] Preparation Example 4

[0046] Copper plating solution 1

[0047] Mix 45 g / L copper chloride, 15 g / L potassium hydroxide and 3 g / L surfactant Span 80, add water to make up to 1 L, and collect to obtain copper plating solution 1.

[0048] Preparation Example 5

[0049] Copper plating solution 2

[0050] Mix 56 g / L copper chloride, 23 g / L potassium hydroxide and 4 g / L surfactant Span 80, add water to make up to 1 L, and collect to obtain copper plating solution 2.

[0051] Preparation Example 6

[0052] Copper plating solution 3

[0053] Mix 70 g / L copper chloride, 30 g / L potassium hydroxide and 5 g / L surfactant Span 80, add water to make up to 1 L, and collect to obtain copper plating solution 3.

[0054] Preparation Example 7

[0055] Fast nickel plating solution 1

[0056] Add 300 g / L nickel sulfate, 35 g / L sodium chloride, 15 g / L H3BO3 and 0.1 g / L surfactant Span 80 to water to a final volume of 1 L, stir and mix, and collect to obtain fast nickel plating solution 1.

[0057] Preparation Example 8

[0058] Fast nickel plating solution 2

[0059] Add 325 g / L nickel sulfate, 42 g / L sodium chloride, 30 g / L H3BO3 and 0.3 g / L surfactant Span 80 to water to a final volume of 1 L, stir and mix, and collect to obtain fast nickel plating solution 2.

[0060] Preparation Example 9

[0061] Fast nickel plating solution 3

[0062] Take 300 g / L nickel sulfate, 20 g / L sodium tungstate, 15 g / L H3BO3 and 35 g / L citric acid, add water to 1 L, stir and mix, and collect fast nickel plating solution 3.

[0063] Preparation Example 10

[0064] Nickel tungsten plating solution 1

[0065] Take 300 g / L nickel sulfate, 20 g / L sodium tungstate, 15 g / L H3BO3 and 35 g / L citric acid, add water to 1 L, stir and mix, and collect fast nickel plating solution 3.

[0066] Preparation Example 11

[0067] Nickel tungsten plating solution 2

[0068] Take 375 g / L nickel sulfate, 30 g / L sodium tungstate, 28 g / L H3BO3 and 42 g / L citric acid, add water to 1 L, stir and mix, and collect fast nickel plating solution 3.

[0069] Preparation Example 12

[0070] Nickel tungsten plating solution 3

[0071] Take 450 g / L nickel sulfate, 40 g / L sodium tungstate, 45 g / L H3BO3 and 50 g / L citric acid, add water to 1 L, stir and mix, and collect fast nickel plating solution 3.

[0072] Example 1

[0073] A corrosion-resistant composite pipe thread brush plating layer, which comprises a nickel tungsten layer and a bottom nickel layer from top to bottom, the thickness of the bottom nickel layer is 1.0-2.0 μm, and the thickness of the nickel tungsten layer is 10-15 μm.

[0074] A method for preparing a corrosion-resistant composite pipe thread brush plating layer, comprising the following preparation steps:

[0075] Sandblasting the surface of the composite pipe thread to be brush plated, the sandblasting uses 120 mesh quartz sand, the sandblasting pressure is 0.7 MPa, the distance between the nozzle and the composite pipe thread is 5 cm, the sandblasting time is 1 min, and the angle between the nozzle and the substrate is 90°.

[0076] After the sandblasting is completed, the substrate is pretreated by first using a positive electrode, a voltage of 10 V, and a relative movement speed of 10 m / min to perform a 1 min electrocleaning treatment using No. 1 electrocleaning solution, and then using a negative electrode, a voltage of 10 V, and a relative movement speed of 10 m / min to perform a 1 min activation treatment using No. 2 activation solution.

[0077] Electro-brush plating of the bottom nickel layer: the surface of the activated substrate is treated by electro-brush plating with the bottom nickel plating solution 1 in a positive connection mode, to prepare the bottom nickel layer, with the control voltage being 10-11 V;

[0078] Electro-brush plating of the nickel-tungsten layer: the surface of the substrate with the bottom nickel layer is treated by electro-brush plating with the nickel-tungsten plating solution 1 in a positive connection mode, to prepare the nickel-tungsten layer, with the control voltage being 8-11 V; after the electro-brush plating is completed, the corrosion-resistant composite pipe thread electro-brush plated layer is prepared after water washing and drying.

[0079] Example 2

[0080] A corrosion-resistant composite pipe thread electro-brush plated layer comprises a nickel-tungsten layer and a bottom nickel layer from top to bottom, the thickness of the bottom nickel layer is 1.0-2.0 μm, and the thickness of the nickel-tungsten layer is 10-15 μm.

[0081] A preparation method of a corrosion-resistant composite pipe thread electro-brush plated layer comprises the following preparation steps:

[0082] The surface of the composite pipe thread to be electro-brush plated is treated by sandblasting, the sandblasting uses 120-mesh quartz sand, the sandblasting pressure is 0.7 MPa, the distance between the nozzle and the composite pipe thread is 5 cm, the sandblasting time is 1 min, and the angle between the nozzle and the substrate is 90°.

[0083] After the sandblasting is completed, the substrate is pretreated by the following steps: first, electrocleaning for 1 min under the conditions of a positive electrode, a voltage of 10 V, and a relative movement speed of 10 m / min with No. 1 electrocleaning solution; and then, activation treatment for 1 min under the conditions of a reverse electrode, a voltage of 10 V, and a relative movement speed of 10 m / min with No. 2 activation solution.

[0084] Electro-brush plating of the bottom nickel layer: the surface of the activated substrate is treated by electro-brush plating with the bottom nickel plating solution 2 in a positive connection mode, to prepare the bottom nickel layer, with the control voltage being 10-11 V;

[0085] Electro-brush plating of the nickel-tungsten layer: the surface of the substrate with the bottom nickel layer is treated by electro-brush plating with the nickel-tungsten plating solution 2 in a positive connection mode, to prepare the nickel-tungsten layer, with the control voltage being 8-11 V; after the electro-brush plating is completed, the corrosion-resistant composite pipe thread electro-brush plated layer is prepared after water washing and drying.

[0086] Example 3

[0087] A corrosion-resistant composite pipe thread electro-brush plated layer comprises a nickel-tungsten layer and a bottom nickel layer from top to bottom, the thickness of the bottom nickel layer is 1.0-2.0 μm, and the thickness of the nickel-tungsten layer is 10-15 μm.

[0088] A preparation method of a corrosion-resistant composite pipe thread electro-brush plated layer comprises the following preparation steps:

[0089] The surface of the composite pipe thread requiring brush plating is sandblasted, the sandblasting uses 120-mesh quartz sand, the sandblasting pressure is 0.7 MPa, the distance between the nozzle and the composite pipe thread is 5 cm, the sandblasting time is 1 min, and the angle between the nozzle and the base body is 90°.

[0090] After the sandblasting is completed, the base material is pretreated by first performing electrocleaning on the positive electrode at a voltage of 10 V and a relative movement speed of 10 m / min for 1 min using No. 1 electrocleaning liquid, and then performing activation treatment on the negative electrode at a voltage of 10 V and a relative movement speed of 10 m / min for 1 min using No. 2 activation liquid.

[0091] Brush plating of a bottom nickel layer: The surface of the activated base material is subjected to brush plating treatment using a bottom nickel electroplating solution 3 in a positive connection mode to prepare a bottom nickel layer, and the control voltage is 10-11 V.

[0092] Brush plating of a nickel-tungsten layer: The surface of the base material with the bottom nickel layer is subjected to brush plating treatment using a nickel-tungsten electroplating solution 3 in a positive connection mode to prepare a nickel-tungsten layer, and the control voltage is 8-11 V. After the electroplating is completed, the corrosion-resistant composite pipe thread brush plating layer can be prepared after water washing and drying.

[0093] Example 4

[0094] A corrosion-resistant composite pipe thread brush plating layer sequentially includes a nickel-tungsten layer, a copper plating layer, and a bottom nickel layer from top to bottom, the thickness of the bottom nickel layer is 1.0-2.0 μm, the thickness of the nickel-tungsten layer is 10-15 μm, the thickness of the copper plating layer is 4.0-6.0 μm, and the thickness of the fast nickel layer is 10-15 μm.

[0095] A preparation method of a corrosion-resistant composite pipe thread brush plating layer includes the following preparation steps:

[0096] The surface of the composite pipe thread requiring brush plating is sandblasted, the sandblasting uses 120-mesh quartz sand, the sandblasting pressure is 0.7 MPa, the distance between the nozzle and the composite pipe thread is 5 cm, the sandblasting time is 1 min, and the angle between the nozzle and the base body is 90°.

[0097] After the sandblasting is completed, the base material is pretreated by first performing electrocleaning on the positive electrode at a voltage of 10 V and a relative movement speed of 10 m / min for 1 min using No. 1 electrocleaning liquid, and then performing activation treatment on the negative electrode at a voltage of 10 V and a relative movement speed of 10 m / min for 1 min using No. 2 activation liquid.

[0098] Brush plating of a bottom nickel layer: The surface of the activated base material is subjected to brush plating treatment using a bottom nickel electroplating solution 2 in a positive connection mode to prepare a bottom nickel layer, and the control voltage is 10-11 V.

[0099] Copper plating layer: using the positive connection mode, the surface of the substrate with a bottom nickel layer is treated by copper plating solution 1 to prepare a copper plating layer, and the control voltage is 8-11V;

[0100] Nickel tungsten plating layer: using the positive connection mode, the surface of the substrate with a fast nickel layer is treated by nickel tungsten plating solution 2 to prepare a nickel tungsten layer, and the control voltage is 8-11V. After the electroplating is completed, the corrosion-resistant composite pipe thread electro-brush plated layer can be prepared after water washing and drying.

[0101] Example 5

[0102] A corrosion-resistant composite pipe thread electro-brush plated layer includes, from top to bottom, a nickel tungsten layer, a copper plating layer, and a bottom nickel layer. The thickness of the bottom nickel layer is 1.0-2.0 μm, the thickness of the nickel tungsten layer is 10-15 μm, the thickness of the copper plating layer is 4.0-6.0 μm, and the thickness of the fast nickel layer is 10-15 μm.

[0103] A method for preparing a corrosion-resistant composite pipe thread electro-brush plated layer includes the following preparation steps:

[0104] The surface of the composite pipe thread to be electro-brush plated is sandblasted. The sandblasting uses 120-mesh quartz sand, the sandblasting pressure is 0.7 MPa, the distance between the nozzle and the composite pipe thread is 5 cm, the sandblasting time is 1 min, and the angle between the nozzle and the substrate is 90°.

[0105] After the sandblasting is completed, the substrate is pretreated by using a positive electrode, a voltage of 10V, and a relative movement speed of 10 m / min for 1 min with No. 1 electro-clean solution, and then by using a reverse electrode, a voltage of 10V, and a relative movement speed of 10 m / min for 1 min with No. 2 activation solution.

[0106] Bottom nickel plating layer: using the positive connection mode, the surface of the substrate with a bottom nickel layer is treated by nickel plating solution 2 to prepare a bottom nickel layer, and the control voltage is 10-11V;

[0107] Copper plating layer: using the positive connection mode, the surface of the substrate with a bottom nickel layer is treated by copper plating solution 2 to prepare a copper plating layer, and the control voltage is 8-11V;

[0108] Nickel tungsten plating layer: using the positive connection mode, the surface of the substrate with a fast nickel layer is treated by nickel tungsten plating solution 2 to prepare a nickel tungsten layer, and the control voltage is 8-11V. After the electroplating is completed, the corrosion-resistant composite pipe thread electro-brush plated layer can be prepared after water washing and drying.

[0109] Example 6

[0110] A kind of corrosion-resistant composite pipe thread brush plating layer, from top to bottom include each other covering nickel tungsten layer, copper plating layer and bottom nickel layer in turn, bottom nickel layer thickness is 1.0-2.0 μm, the thickness of nickel tungsten layer is 10-15 μm, copper plating layer thickness is 4.0-6.0 μm, fast nickel layer thickness is 10-15 μm.

[0111] A kind of corrosion-resistant composite pipe thread brush plating layer preparation method, comprising the following preparation steps:

[0112] The surface of the composite pipe thread to be brush plated is sandblasted, the sandblasting uses 120 mesh quartz sand, the sandblasting pressure is 0.7 MPa, the distance between the nozzle and the composite pipe thread is 5 cm, the sandblasting time is 1 min, and the angle between the nozzle and the substrate is 90°.

[0113] After sandblasting is completed, the substrate is first pretreated by electrocleaning at a forward electrode, a voltage of 10 V, and a relative movement speed of 10 m / min using No. 1 electrocleaning solution for 1 min, and then activated by electrocleaning at a reverse electrode, a voltage of 10 V, and a relative movement speed of 10 m / min using No. 2 activation solution for 1 min.

[0114] Brush plating of a bottom nickel layer: using a positive connection, the surface of the activated substrate is brush plated using a bottom nickel plating solution 2, a bottom nickel layer is prepared, and the control voltage is 10-11 V;

[0115] Brush plating of a copper plating layer: using a positive connection, the surface of the substrate with a bottom nickel layer is brush plated using a copper plating solution 3, a copper plating layer is prepared, and the control voltage is 8-11 V;

[0116] Brush plating of a nickel tungsten layer: using a positive connection, the surface of the substrate with a fast nickel layer is brush plated using a nickel tungsten plating solution 2, a nickel tungsten layer is prepared, and the control voltage is 8-11 V. After electroplating is completed, the corrosion-resistant composite pipe thread brush plating layer is prepared after water washing and drying.

[0117] Example 7

[0118] A kind of corrosion-resistant composite pipe thread brush plating layer, from top to bottom include each other covering nickel tungsten layer, fast nickel layer, copper plating layer and bottom nickel layer in turn, bottom nickel layer thickness is 1.0-2.0 μm, the thickness of nickel tungsten layer is 10-15 μm, copper plating layer thickness is 4.0-6.0 μm, fast nickel layer thickness is 10-15 μm.

[0119] A kind of corrosion-resistant composite pipe thread brush plating layer preparation method, comprising the following preparation steps:

[0120] The surface of the composite pipe thread requiring brush plating is sandblasted, the sandblasting uses 120-mesh quartz sand, the sandblasting pressure is 0.7 MPa, the distance between the nozzle and the composite pipe thread is 5 cm, the sandblasting time is 1 min, and the angle between the nozzle and the base body is 90°.

[0121] After the sandblasting is completed, the base material is pretreated by first performing electrocleaning treatment for 1 min under a forward electrode, a voltage of 10 V, and a relative movement speed of 10 m / min using No. 1 electrocleaning liquid, and then performing activation treatment for 1 min under a reverse electrode, a voltage of 10 V, and a relative movement speed of 10 m / min using No. 2 activation liquid.

[0122] The bottom nickel layer is prepared by using a positive connection mode to perform brush plating treatment on the surface of the activated base material using a bottom nickel plating liquid 2, and the control voltage is 10-11 V.

[0123] The copper plating layer is prepared by using a positive connection mode to perform brush plating treatment on the surface of the base material having the bottom nickel layer using a copper plating liquid 2, and the control voltage is 8-11 V.

[0124] The fast nickel layer is prepared by using a positive connection mode to perform brush plating treatment on the surface of the base material having the copper plating layer using a fast nickel plating liquid 1, and the control voltage is 8-11 V.

[0125] The nickel tungsten layer is prepared by using a positive connection mode to perform brush plating treatment on the surface of the base material having the fast nickel layer using a nickel tungsten plating liquid 2, and the control voltage is 8-11 V. After the electroplating is completed, the corrosion-resistant composite pipe thread brush plating layer is prepared after water washing and drying.

[0126] Example 8

[0127] A corrosion-resistant composite pipe thread brush plating layer sequentially includes a nickel tungsten layer, a fast nickel layer, a copper plating layer, and a bottom nickel layer from top to bottom, the thickness of the bottom nickel layer is 1.0-2.0 μm, the thickness of the nickel tungsten layer is 10-15 μm, the thickness of the copper plating layer is 4.0-6.0 μm, and the thickness of the fast nickel layer is 10-15 μm.

[0128] A preparation method of a corrosion-resistant composite pipe thread brush plating layer includes the following preparation steps:

[0129] The surface of the composite pipe thread requiring brush plating is sandblasted, the sandblasting uses 120-mesh quartz sand, the sandblasting pressure is 0.7 MPa, the distance between the nozzle and the composite pipe thread is 5 cm, the sandblasting time is 1 min, and the angle between the nozzle and the base body is 90°.

[0130] After sandblasting, the substrate is pretreated by first using No. 1 electrocleaning liquid under forward electrode and voltage 10 V and relative moving speed 10 m / min for 1 min, and then using No. 2 activating liquid under reverse electrode and voltage 10 V and relative moving speed 10 m / min for 1 min.

[0131] The bottom nickel layer is prepared by using the bottom nickel electroplating liquid 2 to electro-brush plate the surface of the activated substrate in a positive connection mode, with the control voltage being 10-11 V.

[0132] The copper plating layer is prepared by using the copper electroplating liquid 2 to electro-brush plate the surface of the substrate with the bottom nickel layer in a positive connection mode, with the control voltage being 8-11 V.

[0133] The fast nickel layer is prepared by using the fast nickel electroplating liquid 2 to electro-brush plate the surface of the substrate with the copper plating layer in a positive connection mode, with the control voltage being 8-11 V.

[0134] The nickel tungsten layer is prepared by using the nickel tungsten electroplating liquid 2 to electro-brush plate the surface of the substrate with the fast nickel layer in a positive connection mode, with the control voltage being 8-11 V. After the electroplating is completed, the corrosion-resistant composite pipe thread electro-brush plated layer is prepared after water washing and drying.

[0135] Example 9

[0136] A corrosion-resistant composite pipe thread electro-brush plated layer sequentially includes a nickel tungsten layer, a fast nickel layer, a copper plating layer and a bottom nickel layer from top to bottom, the thickness of the bottom nickel layer is 1.0-2.0 μm, the thickness of the nickel tungsten layer is 10-15 μm, the thickness of the copper plating layer is 4.0-6.0 μm, and the thickness of the fast nickel layer is 10-15 μm.

[0137] A preparation method of a corrosion-resistant composite pipe thread electro-brush plated layer includes the following preparation steps:

[0138] The surface of the composite pipe thread to be electro-brush plated is subjected to sandblasting treatment, the sandblasting uses 120-mesh quartz sand, the sandblasting pressure is 0.7 MPa, the distance between the nozzle and the composite pipe thread is 5 cm, the sandblasting time is 1 min, and the angle between the nozzle and the substrate is 90°.

[0139] After sandblasting, the substrate is pretreated by first using No. 1 electrocleaning liquid under forward electrode and voltage 10 V and relative moving speed 10 m / min for 1 min, and then using No. 2 activating liquid under reverse electrode and voltage 10 V and relative moving speed 10 m / min for 1 min.

[0140] Brush plating of the nickel undercoat layer: the surface of the activated substrate is treated by brush plating with the nickel undercoat plating solution 2 in a positive connection mode, to prepare the nickel undercoat layer, with the control voltage of 10-11 V;

[0141] Brush plating of the copper plating layer: the surface of the substrate with the nickel undercoat layer is treated by brush plating with the copper plating solution 2 in a positive connection mode, to prepare the copper plating layer, with the control voltage of 8-11 V;

[0142] Brush plating of the fast nickel layer: the surface of the substrate with the copper plating layer is treated by brush plating with the fast nickel plating solution 3 in a positive connection mode, to prepare the fast nickel layer, with the control voltage of 8-11 V;

[0143] Brush plating of the nickel tungsten layer: the surface of the substrate with the fast nickel layer is treated by brush plating with the nickel tungsten plating solution 2 in a positive connection mode, to prepare the nickel tungsten layer, with the control voltage of 8-11 V. After the electroplating is completed, the corrosion-resistant composite pipe threaded brush plating layer is prepared after water washing and drying.

[0144] Performance detection

[0145] The composite pipe used in Examples 1-9 is 2532 / C110 laser cladding metallurgical composite pipe, and the specification parameters are shown in Table 1. The buckle type is BGT2 (internal chamfer) gas seal buckle.

[0146] Table 1. Pipe body and coupling material and specification parameters

[0147]

[0148] After 9 times of make and break tests on the corrosion-resistant composite pipes in Examples 1-9, the corrosion-resistant composite pipes in Examples 1-9 are subjected to corrosion-resistant tests, and the test conditions are shown in Table 2.

[0149] Table 2. Corrosion test conditions

[0150]

[0151] After 168 h, 200 h and 400 h of immersion corrosion tests, the samples are taken out, longitudinally cut according to the four quadrants, and then the pipe body and the coupling are separated, and the surface and plating layer conditions of each part are observed, as shown in the following Table 3.

[0152] Table 3. Performance detection table

[0153]

[0154] From the comparison of the results of Examples 1-9 above, it can be found that:

[0155] Embodiments 1-3 illustrate that the application optimizes the composition and structure of the corrosion-resistant composite pipe threaded brush plating layer, adopts a double-layer structure of a bottom nickel layer and a nickel-tungsten layer, instead of the traditional single-layer technical solution. Since the nickel-tungsten amorphous alloy plating layer has a homogeneous structure and uniform chemical composition, a passivation protective layer is easily formed during actual use, effectively preventing the corrosive anions in the external corrosive medium from passing through the corrosion film and avoiding the corrosion of the composite pipe thread.

[0156] In combination with Embodiments 4-6, 7-9 and 1-3, it is illustrated that the application further optimizes the composition and structure of the corrosion-resistant composite pipe threaded brush plating layer. On the one hand, copper and the bottom nickel layer form a good metal bonding effect on the surface, improving the stability of the plating layer, and copper has good corrosion resistance, further improving the corrosion resistance of the composite pipe thread. On the other hand, the copper in the copper plating layer is a cubic crystal with good sliding and ductility. During actual use, when the copper plating layer is subjected to external force, it can effectively slide and relieve stress concentration, thereby improving the anti-cracking performance of the corrosion-resistant composite pipe threaded brush plating layer during use, and further improving the corrosion-resistant life of the corrosion-resistant composite pipe threaded brush plating layer.

[0157] The application is described in detail above in combination with specific embodiments and exemplary examples, but these descriptions cannot be understood as limitations of the application. Those skilled in the art understand that the technical solutions and embodiments of the application can be variously replaced, modified or improved without departing from the spirit and scope of the application, and these all fall within the scope of the application. The protection scope of the application is subject to the appended claims.

[0158] All publications, patent applications, patents and other references mentioned in this specification are hereby incorporated by reference. Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art. In case of conflict, the present specification, including definitions, will control.

[0159] When the specification derives materials, substances, methods, steps, devices or components, etc. with the word head "known to those skilled in the art", "prior art" or similar terms, the objects derived by the word head cover those commonly used in the art at the time of the application, but also include those not commonly used at present, but will be recognized as suitable for similar purposes in the art.

[0160] In the context of the specification, except for the explicitly stated content, any matters or items not mentioned are directly applicable to those known in the art without any change.

Claims

1. A corrosion resistant composite pipe threaded brush plating characterized by, It comprises: a bottom nickel layer, which is arranged on the surface of the composite pipe thread, and has a thickness of 1.0-2.0 μm; a nickel-tungsten layer, which is arranged on the upper surface of the bottom nickel layer and has a thickness of 10-15 μm; a copper plating layer, which is arranged between the bottom nickel layer and the nickel-tungsten layer, and is formed into a metal copper layer with a thickness of 4.0-6.0 μm; and a fast nickel layer is further arranged between the copper plating layer and the nickel-tungsten layer, and is formed into a metal nickel layer with a thickness of 10-15 μm.

2. A method of making a corrosion resistant composite pipe threaded brush plating layer according to claim 1, characterized in that, The corrosion-resistant composite pipe thread brush plating layer comprises the following preparation steps: substrate pretreatment: after the surface of the substrate is subjected to electric cleaning treatment, activation treatment is further performed; bottom nickel layer brush plating: the surface of the activated substrate is subjected to electric brush plating treatment by using a bottom nickel plating solution in a positive connection mode, so as to prepare the bottom nickel layer; copper plating layer brush plating: the surface of the substrate with the bottom nickel layer is subjected to electric brush plating treatment by using a copper plating solution in a positive connection mode, so as to prepare the copper plating layer; fast nickel layer brush plating: the surface of the substrate with the copper plating layer is subjected to electric brush plating treatment by using a fast nickel plating solution in a positive connection mode, so as to prepare the fast nickel layer; nickel-tungsten layer brush plating: the surface of the substrate with the fast nickel layer is subjected to electric brush plating treatment by using a nickel-tungsten plating solution in a positive connection mode, so as to prepare the nickel-tungsten layer; and after the plating is completed, the corrosion-resistant composite pipe thread brush plating layer is prepared.

3. A method of making a corrosion resistant composite pipe threaded brush plating layer according to claim 2, characterized in that, The bottom nickel plating solution comprises the following substances by weight: nickel sulfate 250-400 parts; nickel chloride 10-20 parts; hydrochloric acid 15-30 parts; acetic acid 65-85 parts.

4. A method of making a corrosion resistant composite pipe threaded brush plating layer according to claim 2, characterized in that, The copper plating solution comprises the following substances by weight: copper chloride 45-70 parts; potassium hydroxide 15-30 parts; additive 3-5 parts.

5. The method of claim 2, wherein the method further comprises the step of: The fast nickel plating solution comprises the following substances by weight: ​ nickel sulfate 300-350 parts; sodium chloride 35-60 parts; H3BO3 15-45 parts; additive 0.1-0.5 parts.

6. A method of making a corrosion resistant composite pipe threaded brush plating layer according to claim 2, characterized in that, The nickel-tungsten plating solution comprises the following substances by weight: nickel sulfate 300-450 parts; sodium tungstate 20-40 parts; H3BO3 15-45 parts; citric acid 35-50 parts.

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