Metal tubular pile end plate and processing technology thereof

Abstract

The invention discloses a metal tubular pile end plate and a machining process thereof. The metal tubular pile end plate comprises a metal tubular pile end plate base body and an anti-corrosion coating, wherein the surface of the metal tubular pile end plate base body is coated with the anti-corrosion coating; the anti-corrosion coating comprises a zinc-aluminum alloy powder dispersion layer and a polyurethane layer, the polyurethane layer is attached to the metal pipe pile end plate base body, and the zinc-aluminum alloy powder dispersion layer is dispersed in the polyurethane layer; a passivation layer is arranged on the surface of the metal pipe pile end plate base body. The anti-corrosion performance of the metal pipe pile end plate can be improved, the service life of the pipe pile end plate is prolonged, and therefore the quality of a pipe pile is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of metal pipe pile end plate and its processing technology, belong to pipe pile end plate technical field. BACKGROUND

[0002] Pipe pile is installed in foundation by driving or sinking, such as large pipe pile, PHC pile and other prestressed concrete pipe pile, applied to wharf, bridge and other pile foundation engineering. With the development of wharf bridge and other engineering towards large-scale, deep water, offshore, the structural mechanics performance, engineering performance requirement of engineering pile is higher, and SPHC pile is developed and applied. Since pipe pile is deeply buried in the ground, the surrounding environment has certain corrosiveness, and pipe pile joint such as pipe pile end plate is the key part of corrosion prevention, and the existing pipe pile end plate is easy to be corroded, and pipe pile has great quality hidden danger. SUMMARY

[0003] At least for one problem of the prior art, the present application provides a kind of metal pipe pile end plate and its processing technology, which can improve the corrosion resistance of metal pipe pile end plate, improve the service life of pipe pile end plate, thereby improving the quality of pipe pile.

[0004] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows: a kind of metal pipe pile end plate, including metal pipe pile end plate base body and anticorrosive coating coated on the surface of metal pipe pile end plate base body;

[0005] The anticorrosive coating is zinc-aluminum alloy powder dispersion layer and polyurethane layer, wherein the polyurethane layer is attached to the metal pipe pile end plate base body, and the zinc-aluminum alloy powder dispersion layer is dispersed in the polyurethane layer;

[0006] The surface of the metal pipe pile end plate base body is passivation layer.

[0007] Preferably, in the anticorrosive coating, the mass fraction of zinc-aluminum alloy powder dispersion layer in polyurethane layer is 30-35%.

[0008] Preferably, the particle size of the zinc-aluminum alloy powder is 15-40 μm.

[0009] Preferably, the thickness of the anticorrosive coating is 150-250 μm.

[0010] Preferably, in the anticorrosive coating, the raw materials of the polyurethane layer are as follows according to weight fraction: polyurethane prepolymer 60-73%, mica powder 9-14%, zinc phosphate 3-4.5%, benzotriazole 2.3-3.8%, barium sulfate 1.2-3.5%, nano-silicon dioxide 1-2.2%, bis-[gamma-(triethoxysil) propyl] tetrasulfide 0.8-1.5% and butyl acetate 8-14%.

[0011] Preferably, the particle size of the mica powder is 10-20 μm, the particle size of the barium sulfate is 0.5-2 μm, and the particle size of the nano-silica is 50-100 nm.

[0012] Preferably, the polyurethane prepolymer is generated by polymerization of polyether polyol and isophorone diisocyanate under the catalysis of dibutyltin dilaurate; the ratio of the polyether polyol and the isophorone diisocyanate is controlled according to the -NCO group and the -OH group, and the molar ratio R of the -NCO group to the -OH group is 1.2-1.7.

[0013] A processing technology of a metal pipe pile end plate, comprising the following steps:

[0014] (1) based on the pipe pile design end plate drawing, and based on the end plate drawing processing, obtaining a metal pipe pile end plate base body;

[0015] (2) polishing the metal pipe pile end plate base body, and then placing it in a passivation liquid for passivation, to obtain a semi-finished metal pipe pile end plate base body;

[0016] (3) adding zinc-aluminum alloy powder accessories to polyurethane main materials, stirring and homogenizing, so that the zinc-aluminum alloy powder accessories are uniformly dispersed in the polyurethane main materials to form a corrosion-resistant coating, spraying the corrosion-resistant coating on the semi-finished metal pipe pile end plate base body, and then drying and solidifying to form a corrosion-resistant coating layer with a thickness of 150-250 μm, to obtain a metal pipe pile end plate.

[0017] Preferably, the production process of the metal pipe pile end plate base body in step (1) is as follows: based on the end plate drawing, cutting and processing the metal end plate raw material, then heat treating and deburring, and finally fixing and drilling to obtain the metal pipe pile end plate base body.

[0018] Preferably, the passivation liquid in step (1) is a phosphate-organic acid composite passivation liquid.

[0019] Preferably, the passivation liquid in step (2) is as follows in terms of mass fraction: 1-2% of sodium dihydrogen phosphate, 0.2-0.5% of organic acid, 0.5-1.3% of sodium nitrite, 0.1-0.2% of potassium hydrogen fluoride, and the rest being water.

[0020] Preferably, the raw materials of the polyurethane main material in step (3) are as follows in terms of weight fraction: 60-73% of polyurethane prepolymer, 9-14% of mica powder, 3-4.5% of zinc phosphate, 2.3-3.8% of benzotriazole, 1.2-3.5% of barium sulfate, 1-2.2% of nano-silica, 0.8-1.5% of bis-[gamma-(triethoxysil) propyl] tetrasulfide, and 8-14% of butyl acetate.

[0021] Preferably, the drying and curing of step (3) is at a temperature of 75-80°C for 1.5-2.5h.

[0022] The metal pipe pile end plate of the present application has the following advantages: the metal pipe pile end plate of the present application is coated with an anticorrosive coating on the surface of the end plate base, the polyurethane layer is attached to the end plate base, and the zinc-aluminum alloy powder dispersion layer is dispersed in the polyurethane layer to form the anticorrosive coating, which effectively improves the anticorrosive performance of the end plate and prolongs the service life of the end plate; the polyurethane layer of the metal pipe pile end plate of the present application is formed into a complex system with polyurethane prepolymer, mica powder, zinc phosphate, benzotriazole, barium sulfate, nano-silicon dioxide, and bis-[gamma-(triethoxysil) propyl] tetrasulfide, which has better anticorrosive performance and improves the anticorrosive effect of the anticorrosive coating; the metal pipe pile end plate processing method of the present application uses a phosphate-organic acid composite passivation solution, which is more conducive to improving the bonding strength of the anticorrosive coating and the end plate base; compared with the zinc plating layer-polyurethane layer anticorrosive coating, the metal pipe pile end plate processing method of the present application uses the zinc-aluminum alloy powder dispersion layer and the polyurethane layer anticorrosive coating, which shortens the processing procedure and effectively ensures the anticorrosive effect of the end plate. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The figure is a structural schematic diagram of the metal pipe pile end plate of the present application.

[0024] In the figure: 1, metal pipe pile end plate base; 2, anticorrosive coating; 21, zinc-aluminum alloy powder dispersion layer; 22, polyurethane layer. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be described in detail below with reference to the accompanying drawings, and the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0026] Embodiment 1

[0027] A metal pipe pile end plate processing method has the following steps:

[0028] (1) Based on the end plate drawing, the metal end plate raw material is cut and processed, followed by heat treatment, deburring, hole finding and scribing, and finally fixed for drilling processing to obtain the metal pipe pile end plate base 1;

[0029] (2) The metal pipe pile end plate base 1 is polished and then placed in a phosphate-organic acid composite passivation solution for passivation to obtain a semi-finished metal pipe pile end plate base;

[0030] The phosphate-organic acid composite passivation solution contains 1.5% of sodium dihydrogen phosphate, 0.4% of organic acid, 0.8% of sodium nitrite, 0.15% of potassium hydrogen fluoride, and the rest is water in terms of mass fraction;

[0031] (3) Zinc-aluminum alloy powder auxiliary material with a particle size of 15-40 μm is added to the polyurethane main material, the mass fraction of the zinc-aluminum alloy powder auxiliary material in the polyurethane layer main material is 32.5%, and the zinc-aluminum alloy powder auxiliary material is uniformly dispersed in the polyurethane main material to form a corrosion-resistant coating, the corrosion-resistant coating is sprayed on the substrate of the above-mentioned semi-finished metal pipe pile end plate, and then dried and solidified at a temperature of 75-80 ℃ for 2 h to form a corrosion-resistant coating layer 2 with a thickness of 200 μm, the zinc-aluminum alloy powder dispersion layer 2 is dispersed in the polyurethane layer 21, and the polyurethane layer 21 is attached to the surface of the metal pipe pile end plate substrate 1 to obtain a metal pipe pile end plate.

[0032] The raw materials of the polyurethane main material include, in terms of weight fraction, 66% of polyurethane prepolymer, 12% of mica powder with a particle size of 10-20 μm, 4% of zinc phosphate, 3% of benzotriazole, 3% of barium sulfate with a particle size of 0.5-2 μm, 1.5% of nano-silicon dioxide with a particle size of 50-100 nm, 1.2% of bis-[γ-(triethoxysil) propyl] tetrasulfide, and 9.3% of butyl acetate.

[0033] The polyurethane prepolymer is generated by the polymerization reaction of polyether polyol, isophorone diisocyanate, and a dibutyl tin dilaurate catalyst, and the molar ratio R of -NCO groups to -OH groups is controlled to be 1.5.

[0034] Example 2

[0035] A processing technology of a metal pipe pile end plate includes the following steps:

[0036] (1) Based on the end plate drawing, the metal end plate raw material is cut and processed, followed by heat treatment, deburring, hole finding and scribing, and finally fixed for drilling processing to obtain a metal pipe pile end plate substrate 1.

[0037] (2) The metal pipe pile end plate substrate 1 is polished and then placed in a phosphate-organic acid composite passivation solution for passivation to obtain a semi-finished metal pipe pile end plate substrate.

[0038] The phosphate-organic acid composite passivation solution contains 1.5% of sodium dihydrogen phosphate, 0.4% of organic acid, 0.8% of sodium nitrite, 0.15% of potassium hydrogen fluoride, and the rest is water in terms of mass fraction;

[0039] (3) zinc-aluminum alloy powder auxiliary material with particle size of 15-40 μm is added to polyurethane main material, the mass fraction of zinc-aluminum alloy powder auxiliary material in polyurethane layer main material is 35%, the zinc-aluminum alloy powder auxiliary material is uniformly dispersed in the polyurethane main material to form a corrosion-resistant coating, the corrosion-resistant coating is sprayed on the substrate of the above-mentioned semi-finished metal pipe pile end plate, and then dried and cured at a temperature of 75-80 ℃ for 2 h to form a corrosion-resistant coating layer 2 with a thickness of 250 μm, the zinc-aluminum alloy powder dispersion layer 2 is dispersed in the polyurethane layer 21, and the polyurethane layer 21 is attached to the surface of the metal pipe pile end plate substrate to obtain a metal pipe pile end plate;

[0040] The raw materials of the polyurethane main material include, by mass fraction, 73% of polyurethane prepolymer, 9% of mica powder with a particle size of 10-20 μm, 3% of zinc phosphate, 2.3% of benzotriazole, 1.2% of barium sulfate with a particle size of 0.5-2 μm, 1% of nano-silicon dioxide with a particle size of 50-100 nm, 0.8% of bis-[γ-(triethoxysil) propyl] tetrasulfide, and 9.7% of butyl acetate.

[0041] The polyurethane prepolymer is generated by polymerization reaction of polyether polyol, isophorone diisocyanate, and a dibutyl tin dilaurate catalyst, with the molar ratio R of -NCO groups to -OH groups being controlled to be 1.7.

[0042] Example 3

[0043] A processing technology of a metal pipe pile end plate, and the process steps are as follows:

[0044] (1) Based on the end plate drawing, the metal end plate raw material is cut and processed, then heat treated, deburred, and then hole finding and scribing are performed, and finally fixed for drilling processing to obtain a metal pipe pile end plate substrate 1;

[0045] (2) The above-mentioned metal pipe pile end plate substrate is polished, and then placed in a phosphate-organic acid composite passivation solution for passivation to obtain a semi-finished metal pipe pile end plate substrate;

[0046] The phosphate-organic acid composite passivation solution includes, by mass fraction, 2% of sodium dihydrogen phosphate, 0.5% of organic acid, 1.3% of sodium nitrite, and 0.2% of potassium hydrogen fluoride, and the rest is water.

[0047] (3) zinc-aluminum alloy powder auxiliary material with particle size of 15-40 μm is added to polyurethane main material, the mass fraction of zinc-aluminum alloy powder auxiliary material in polyurethane layer main material is 30%, and stirring homogenization is performed to uniformly disperse the zinc-aluminum alloy powder auxiliary material in the polyurethane main material to form a corrosion-resistant coating, the corrosion-resistant coating is sprayed on the substrate of the semi-finished metal pipe pile end plate, and then drying and curing are performed at a temperature of 75-80 ℃ for 1.5-2.5 h to form a corrosion-resistant coating layer 2 with a thickness of 150 μm, the zinc-aluminum alloy powder dispersion layer 2 is dispersed in the polyurethane layer 21, and the polyurethane layer 21 is attached to the surface of the metal pipe pile end plate substrate to obtain the metal pipe pile end plate;

[0048] The raw materials of the polyurethane main material include, by weight fraction, 60% of polyurethane prepolymer, 14% of mica powder with a particle size of 10-20 μm, 4.5% of zinc phosphate, 3.8% of benzotriazole, 3.5% of barium sulfate with a particle size of 0.5-2 μm, 2.2% of nano-silicon dioxide with a particle size of 50-100 nm, 1.5% of bis-[γ-(triethoxysil) propyl] tetrasulfide, and 10.5% of butyl acetate.

[0049] The polyurethane prepolymer is generated by polymerization reaction of polyether polyol, isophorone diisocyanate, and dibutyl tin dilaurate catalyst, and the molar ratio R of -NCO groups to -OH groups is controlled to be 1.2.

[0050] Comparative Example 1

[0051] A processing technology of a metal pipe pile end plate, which is different from Example 2 in that (3) the corrosion-resistant coating is sprayed on the substrate of the semi-finished metal pipe pile end plate, the corrosion-resistant coating is polyurethane main material, and then drying and curing are performed at a temperature of 75-80 ℃ for 2 h to form a corrosion-resistant coating layer with a thickness of 250 μm, the corrosion-resistant coating layer is a polyurethane layer, and the polyurethane layer is attached to the surface of the metal pipe pile end plate substrate to obtain the metal pipe pile end plate.

[0052] Comparative Example 2

[0053] A processing technology of a metal pipe pile end plate, which is different from Example 2 in that (3) zinc powder auxiliary material with a particle size of 15-40 μm is added to polyurethane main material, the mass fraction of zinc powder auxiliary material in polyurethane layer main material is 35%, and stirring homogenization is performed to uniformly disperse the zinc powder auxiliary material in the polyurethane main material to form a corrosion-resistant coating, the corrosion-resistant coating is sprayed on the substrate of the semi-finished metal pipe pile end plate, and then drying and curing are performed at a temperature of 75-80 ℃ for 2 h to form a corrosion-resistant coating layer with a thickness of 250 μm, the zinc-aluminum alloy powder dispersion layer is dispersed in the polyurethane layer, and the polyurethane layer is attached to the surface of the metal pipe pile end plate substrate to obtain the metal pipe pile end plate.

[0054] Comparative Example 3

[0055] A processing technology of a metal pipe pile end plate, compared with example 2, the difference lies in: the raw material of the polyurethane main material, according to the weight fraction, polyurethane prepolymer 73%, mica powder with particle size 10-20 μm 9%, zinc phosphate 4.6%, barium sulfate with particle size 0.5-2 μm 1.5%, nano silicon dioxide with particle size 50-100 nm 1%, bis-[gamma-(triethoxysilane) propyl] tetrasulfide 1.2% and butyl acetate 9.7%;

[0056] Comparative example 4

[0057] A processing technology of a metal pipe pile end plate, compared with example 2, the difference lies in: the raw material of the polyurethane main material, according to the weight fraction, polyurethane prepolymer 73%, mica powder with particle size 10-20 μm 10.2%, zinc phosphate 3%, benzotriazole 2.3%, nano silicon dioxide with particle size 50-100 nm 1%, bis-[gamma-(triethoxysilane) propyl] tetrasulfide 0.8% and butyl acetate 9.7%.

[0058] Comparative example 5

[0059] A processing technology of a metal pipe pile end plate, compared with example 2, the difference lies in: the raw material of the polyurethane main material, according to the weight fraction, polyurethane prepolymer 73%, mica powder with particle size 10-20 μm 10%, zinc phosphate 3%, benzotriazole 2.3%, barium sulfate with particle size 0.5-2 μm 1.2%, bis-[gamma-(triethoxysilane) propyl] tetrasulfide 0.8% and butyl acetate 9.7%.

[0060] Comparative example 6

[0061] A processing technology of a metal pipe pile end plate, compared with example 2, the difference lies in: (2) the metal pipe pile end plate substrate is polished, not passivated, to obtain a semi-finished metal pipe pile end plate substrate.

[0062] Comparative example 7

[0063] A processing technology of a metal pipe pile end plate, compared with example 2, the difference lies in: the phosphate passivation solution, according to the mass fraction, sodium dihydrogen phosphate 1%, sodium nitrite 0.5%, potassium hydrogen fluoride 0.1%, and the rest is water.

[0064] Comparative example 8

[0065] A processing technology of a metal pipe pile end plate, compared with example 2, the difference lies in: (2) the metal pipe pile end plate substrate is polished, and then placed in a phosphate-organic acid composite passivation solution for passivation, to obtain a metal pipe pile end plate, without further spraying.

[0066] The metal pipe pile end plate of the above-mentioned examples 1-3 and comparative examples 1-7 is tested: the adhesion grade of the anticorrosive coating is tested according to the standard GB / T9286-2021; the salt spray resistance is tested according to the standard GB / T 1771-2007; the acid resistance (0.1 mol / L hydrochloric acid solution and 0.1 mol / L sulfuric acid solution) is tested according to the standard GB / T 9274-1988, and the test time is 24 h; the results are shown in the following table.

[0067] Table

[0068]

[0069]

[0070] As can be seen from the above table, the metal pipe pile produced by the processing technology of the application has an anticorrosive coating covering the surface of the metal pipe pile end plate base body, with a polyurethane layer attached to the metal pipe pile end plate base body and a zinc-aluminum alloy powder dispersion layer dispersed in the polyurethane layer to form an anticorrosive coating, effectively improving the anticorrosive performance of the metal pipe pile end plate and greatly improving the service life of the pipe pile end plate; in the processing method of the metal pipe pile end plate of the application, the end plate blank is first polished and passivated, and then sprayed with anticorrosive paint, which effectively improves the bonding strength of the anticorrosive paint layer and the metal pipe pile end plate base body through passivation of the metal pipe pile end plate base body, further improving the anticorrosive performance of the metal pipe pile end plate.

[0071] It will be obvious to a person skilled in the art that, in light of the foregoing description of exemplary embodiments, the present application is not limited to the details of the foregoing exemplary embodiments but can be implemented in other concrete forms without departing from the spirit and essential characteristics of the application. Thus, the embodiments should be considered in all respects as illustrative and not restrictive, the scope of the application being defined by the appended claims rather than by the foregoing description, and it is intended to include all changes coming within the meaning and equivalency range of the elements of the claims.

[0072] In addition, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the specification is described in this way only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A metal pipe pile end plate, characterized in that: It includes a metal pipe pile end plate substrate and an anti-corrosion coating coated on the surface of the metal pipe pile end plate substrate; The anti-corrosion coating is a zinc-aluminum alloy powder dispersion layer and a polyurethane layer, wherein the polyurethane layer is attached to the metal pipe pile end plate substrate, and the zinc-aluminum alloy powder dispersion layer is dispersed in the polyurethane layer; The surface of the metal pipe pile end plate substrate is a passivation layer.

2. The metal pipe pile end plate according to claim 1, characterized in that: In the anti-corrosion coating, the mass fraction of the zinc-aluminum alloy powder dispersion layer to the polyurethane layer is 30-35%.

3. The metal pipe pile end plate according to claim 1, characterized in that: The zinc-aluminum alloy powder has a particle size of 15 to 40 μm.

4. The metal pipe pile end plate according to claim 1, characterized in that: The thickness of the anti-corrosion coating is 150 to 250 μm.

5. The metal pipe pile end plate according to claim 1, characterized in that: In the anti-corrosion coating, the raw materials of the polyurethane layer are as follows, calculated by weight: 60-73% of polyurethane prepolymer, 9-14% of mica powder, 3-4.5% of zinc phosphate, 2.3-3.8% of benzotriazole, 1.2-3.5% of barium sulfate, 1-2.2% of nano-silicon dioxide, 0.8-1.5% of bis-[γ-(triethoxysilyl)propyl]tetrasulfide and 8-14% of butyl acetate.

6. The metal pipe pile end plate according to claim 5, characterized in that: The polyurethane prepolymer is produced by polymerization of polyether polyol and isophorone diisocyanate with dibutyltin dilaurate as a catalyst; wherein the ratio of polyether polyol and isophorone diisocyanate is controlled according to the -NCO group and the -OH group, and the molar ratio R of the -NCO group to the -OH group is 1.2 to 1.7; The particle size of the mica powder is 10-20 μm, the particle size of the barium sulfate is 0.5-2 μm, and the particle size of the nano-silicon dioxide is 50-100 nm.

7. A process for processing a metal pipe pile end plate according to any one of claims 1 to 6, characterized in that: The following steps are involved: (1) Designing the end plate drawing based on the pipe pile, and processing based on the end plate drawing to obtain the metal pipe pile end plate matrix; (2) polishing the metal pipe pile end plate substrate, and then placing it in a phosphate-organic acid composite passivation solution for passivation to obtain a semi-finished metal pipe pile end plate substrate; (3) Adding zinc-aluminum alloy powder auxiliary material to the polyurethane main material, stirring and homogenizing, so that the zinc-aluminum alloy powder auxiliary material is evenly dispersed in the polyurethane main material to form an anti-corrosion coating, spraying the anti-corrosion coating on the above-mentioned semi-finished metal pipe pile end plate substrate, and then drying and curing the formed anti-corrosion coating to obtain the metal pipe pile end plate.

8. The process for processing a metal pipe pile end plate according to claim 7, characterized in that: The passivation solution of step (2) is as follows, calculated by mass fraction: 1-2% sodium dihydrogen phosphate, 0.2-0.5% organic acid, 0.5-1.3% sodium nitrite, 0.1-0.2% potassium bifluoride, and the rest is water.

9. The process for processing a metal pipe pile end plate according to claim 7, characterized in that: Drying and curing in step (3): temperature is 75-80°C, time is 1.5-2.5h.

10. The process for processing a metal pipe pile end plate according to claim 7, characterized in that: The production process of the metal pipe pile end plate matrix in step (1) is as follows: based on the end plate drawing, the metal end plate raw material is cut and processed, followed by heat treatment and deburring, and then hole locating and marking, and finally fixed and drilled to obtain the metal pipe pile end plate matrix.

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