CN111748759A - Flame spraying corrosion-resistant coating for stainless steel pipe valve of fluid system - Google Patents

Flame spraying corrosion-resistant coating for stainless steel pipe valve of fluid system Download PDF

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Publication number
CN111748759A
CN111748759A CN201910240421.4A CN201910240421A CN111748759A CN 111748759 A CN111748759 A CN 111748759A CN 201910240421 A CN201910240421 A CN 201910240421A CN 111748759 A CN111748759 A CN 111748759A
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coating
spraying
stainless steel
nialmgsc
mpa
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CN201910240421.4A
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不公告发明人
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Yangzhou Noah Fluid System Technology Co ltd
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Yangzhou Noah Fluid System Technology Co ltd
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Priority to CN201910240421.4A priority Critical patent/CN111748759A/en
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
    • C23C4/129—Flame spraying
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
    • C23C4/06—Metallic material
    • C23C4/067—Metallic material containing free particles of non-metal elements, e.g. carbon, silicon, boron, phosphorus or arsenic

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Coating By Spraying Or Casting (AREA)

Abstract

The invention relates to design and preparation of a flame spraying corrosion-resistant coating for a stainless steel pipe valve of a fluid system. The invention relates to a flame spraying NiAlMgSc powder core wire, wherein the outer skin adopts a pure aluminum strip, and the powder core comprises the following components: nickel: 15-20%; magnesium: 5-7%; scandium: 2-5%; boron: 1-3%; silicon: 1-3%; aluminum: and (4) the balance. The technological parameters of flame spraying NiAlMgSc coating are as follows: the oxygen pressure is 0.5-0.8 MPa; the acetylene pressure is 0.75-1.15 MPa; the pressure of the compressed air is 0.6-0.8 MPa; the spraying distance is 140 mm-160 mm; the wire feeding speed is 1.13-1.75 m/min; the spraying angle is 90 degrees. The invention can solve the problem of corrosion protection of the surface of the stainless steel pipe valve part of the fluid system in the ship ballast tank, and can also be applied to dry-wet alternate corrosion protection of the ship ballast tank in a full-submerged area and a splashing area of the sea and environmental corrosion protection of a steel structure bridge in an atmospheric area of the sea.

Description

Flame spraying corrosion-resistant coating for stainless steel pipe valve of fluid system
Technical Field
The invention relates to a preparation method of a flame spraying corrosion-resistant coating of a stainless steel pipe valve of a fluid system, which is mainly suitable for corrosion protection of the surface of a stainless steel pipe valve component of the fluid system in a ship running in a marine environment.
Background
Since the seawater contains about 3% of NaCl, which is the highest concentration of metal corrosion rate, the ship bridge is in such marine environment for a long time, the corrosion is extremely serious, and the ballast water tank of the ship is in a severe working environment, and the alternation of dry and wet is frequent, so that the stainless steel pipe valve component of the fluid system in each cabin of the ship becomes one of the most serious corrosion parts. Especially, the ship ballast tank is used for providing stability for ships and adjusting ship draft so as to meet the requirement of good maneuvering performance of the ships. The corrosion environment which the ballast tank may encounter according to the requirements of ship navigation and different sea conditions mainly comprises a seawater atmosphere area, a seawater splashing area, a seawater full immersion area and a ship bottom sediment area. The ship is frequently in service in the four corrosion environments, so that the stainless steel pipe valve components of the fluid system in the ballast tank are always in a dry-wet alternating state of empty tank/seawater ballast, and are difficult to protect, so that the corrosion environment is very severe. Early corrosion to the ballast tank of the ship is not paid attention to enough, no protective measures are taken, corrosion allowance is improved by increasing the thickness of the steel plate, and the weight of the empty ship is increased. In recent years, the surface and the inner wall of the stainless steel pipe are coated, but the corrosion of the valve parts of the stainless steel pipe of the internal fluid system is still serious.
Therefore, a metal-based corrosion-resistant coating, such as a Zn coating, a Zn-Al coating and a Zn-Al-Mg coating, is prepared on the surface of a fluid system stainless steel pipe valve component in a ship ballast tank by adopting a metal coating protection technology, but aiming at the inherent characteristic of porous flame spraying coating, the invention provides a method for redesigning and improving a conventional metal corrosion-resistant coating (the Zn coating, the Zn-Al coating and the Zn-Al-Mg coating) system, and nickel (Ni), scandium (Sc), boron (B) and silicon (Si) are added into the coating, so that a NiAlMgSc-based corrosion-resistant coating with high bonding strength and compact coating is prepared, and the durability and the safety of the ship ballast tank are ensured. The invention can also be widely applied to the requirements of the corrosion resistance service life of steel structures such as steel bridges, hydraulic structures, ocean steel structures and the like.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a material design and coating preparation process method for flame spraying of a NiAlMgSc anticorrosive coating on the surface of a stainless steel pipe valve of a ship fluid system, which can protect the environmental corrosion of the stainless steel pipe valve component of the fluid system in each cabin of a ship in an ocean atmosphere region and improve the corrosion protection performance of a ship ballast tank in an ocean full immersion region and a splashing region.
The invention provides a flame spraying corrosion-resistant coating for a stainless steel pipe valve of a fluid system, which comprises a NiAlMgSc powder core wire material and a NiAlMgSc spraying layer prepared on the surface of a stainless steel matrix by adopting a flame spraying technology. The sheath of the flame sprayed NiAlMgSc powder core wire adopts a pure aluminum strip, and the powder core comprises the following components in percentage by weight:
15 to 20 percent of nickel
5 to 7 percent of magnesium
Scandium 2-5%
1 to 3 percent of boron
1 to 3 percent of silicon
Balance of aluminum
The invention provides a preparation method for preparing a NiAlMgSc spray coating on the surface of a stainless steel matrix by using a flame spraying technology, which comprises the following steps:
1. preparation of cored wire
Rolling a pure aluminum strip into a U shape, and adding the powder of the cored wire accounting for 25-30% of the weight of the cored wire into the U-shaped groove;
closing the U-shaped groove, coating the powder in the U-shaped groove, gradually drawing and reducing the diameter of the U-shaped groove through a wire drawing die, and finally preparing the flame spraying cored wire material with the diameter of 3 mm;
2. preparation of flame-sprayed NiAlMgSc coating
The surface of 316 stainless steel is cleaned by oil removal, rust removal, dirt removal and the like, and then is subjected to sand blasting roughening treatment, wherein the technological parameters of flame spraying of the NiAlMgSc coating are as follows: the oxygen pressure is 0.5-0.8 MPa; the acetylene pressure is 0.75-1.15 MPa; the pressure of the compressed air is 0.6-0.8 MPa; the spraying distance is 140 mm-160 mm; the wire feeding speed is 1.13-1.75 m/min; the spraying angle is 90 degrees;
3. advantages of the invention
The invention provides a method for spraying a NiAlMgSc anticorrosive coating on the surface of a stainless steel pipe valve of a ship fluid system by adopting flame, wherein Zn or Al in the coating generates a chemical reaction to generate a phosphate passive film with stronger corrosion resistance, thereby playing a good role in physically isolating and sealing the external corrosive atmosphere, blocking the entry of corrosive media and achieving a stronger protection effect on matrix metal.
The Ni is added into the coating components in the Zn-Al-Mg coating, so that the low-melting-point components (Zn, Al and Mg) in the coating are not easy to oxidize and burn in the spraying process, the porosity and the mechanical property of the coating are favorably improved, and the strength and the impact toughness of the coating are improved.
Sc is used as the most effective modifier in the aluminum alloy, and Sc is added into the coating to play a role in refining grains and improving the strength of the coating. The main Sc is added into the Al-based coating powder material, a large amount of eutectic Al-Sc alloy is condensed to precipitate primary A1 during the coating deposition in the high-temperature melting process of the powder core material, and Sc phase has the same lattice structure and close lattice constant as Al solid solution and can be used as a crystal core to refine grains. Meanwhile, Sc is easy to be dissolved in the coating matrix in a solid mode, and Sc precipitates and strengthens the alloy.
B and Si are indispensable elements in most self-fluxing alloys, and the content of oxides in the coating can be reduced by adding B, Si elements in the spraying wire. Therefore, the surface of the fused spray particles can generate a layer of B after the strong deoxidation and reduction of B and Si in the spraying process2O3And SiO2The borosilicate composite oxide has the melting point of 722 ℃, has small viscosity and light specific gravity, is easy to volatilize in the air and not remain in the coating, and simultaneously greatly reduces the pores between the coating and the substrate, thereby achieving the purpose of preventing the metal from losing efficacy.
Detailed Description
Example 1
(1) Preparation of cored wire
Rolling a pure aluminum strip with the thickness of 10mm multiplied by 0.3mm (the width is 10mm, the thickness is 0.3 mm) into a U shape, adding mixed powder core components into the U-shaped groove, wherein the powder core filling rate is 25%, closing the U-shaped groove to wrap the powder core therein, and gradually drawing and reducing the diameter through a wire drawing die to finally enable the diameter to reach 2mm, wherein the powder core comprises the following components in percentage by mass: nickel: 15 percent; magnesium: 5 percent; scandium: 2 percent; boron: 1 percent; silicon: 1 percent; aluminum: the balance;
(2) preparation of flame spraying NiAlMgSc anticorrosive coating
The surface of 316 stainless steel is cleaned by oil removal, rust removal, dirt removal and the like, and then is subjected to sand blasting roughening treatment, wherein the technological parameters of flame spraying of the NiAlMgSc coating are as follows: the oxygen pressure is 0.5 MPa; acetylene pressure 0.75 MPa; the pressure of compressed air is 0.6 MPa; the spraying distance is 140 mmmm; the wire feeding speed is 1.13 m/min; the spraying angle is 90 degrees.
Example 2
(1) Preparation of cored wire
Rolling a pure aluminum strip with the thickness of 10mm multiplied by 0.3mm (the width is 10mm, the thickness is 0.3 mm) into a U shape, adding mixed powder core components into the U-shaped groove, wherein the powder core filling rate is 26%, closing the U-shaped groove to wrap the powder core therein, and gradually drawing and reducing the diameter through a wire drawing die to finally enable the diameter to reach 2mm, wherein the powder core comprises the following components in percentage by mass: nickel: 17 percent; magnesium: 6 percent; scandium: 3 percent; boron: 2 percent; silicon: 2 percent; aluminum: the balance;
(2) preparation of flame spraying NiAlMgSc anticorrosive coating
The surface of 316 stainless steel is cleaned by oil removal, rust removal, dirt removal and the like, and then is subjected to sand blasting roughening treatment, wherein the technological parameters of flame spraying of the NiAlMgSc coating are as follows: the oxygen pressure is 0.6 MPa; acetylene pressure is 0.8 MPa; the pressure of compressed air is 0.7 MPa; the spraying distance is 150 mm; the wire feeding speed is 1.26 m/min; the spraying angle is 90 degrees.
Example 3
(1) Preparation of cored wire
Rolling a pure aluminum strip with the thickness of 10mm multiplied by 0.3mm (the width is 10mm, the thickness is 0.3 mm) into a U shape, adding mixed powder core components into the U-shaped groove, wherein the powder core filling rate is 28%, closing the U-shaped groove to wrap the powder core therein, and gradually drawing and reducing the diameter through a wire drawing die to finally enable the diameter to reach 2mm, wherein the powder core comprises the following components in percentage by mass: nickel: 18 percent; magnesium: 7 percent; scandium: 4 percent; boron: 2 percent; silicon: 2 percent; aluminum: the balance;
(2) preparation of flame spraying NiAlMgSc anticorrosive coating
The surface of 316 stainless steel is cleaned by oil removal, rust removal, dirt removal and the like, and then is subjected to sand blasting roughening treatment, wherein the technological parameters of flame spraying of the NiAlMgSc coating are as follows: the oxygen pressure is 0.7 MPa; acetylene pressure is 0.9 MPa; the pressure of compressed air is 0.7 MPa; the spraying distance is 150 mm; the wire feeding speed is 1.55 m/min; the spraying angle is 90 degrees.
Example 4
(1) Preparation of cored wire
Rolling a pure aluminum strip with the thickness of 10mm multiplied by 0.3mm (the width is 10mm, the thickness is 0.3 mm) into a U shape, adding mixed powder core components into the U-shaped groove, wherein the powder core filling rate is 30%, closing the U-shaped groove to wrap the powder core therein, and gradually drawing and reducing the diameter through a wire drawing die to finally enable the diameter to reach 2mm, wherein the powder core comprises the following components in percentage by mass: nickel: 20 percent; magnesium: 7 percent; scandium: 5 percent; boron: 3 percent; silicon: 3 percent; aluminum: the balance;
(2) preparation of flame spraying NiAlMgSc anticorrosive coating
The surface of 316 stainless steel is cleaned by oil removal, rust removal, dirt removal and the like, and then is subjected to sand blasting roughening treatment, wherein the technological parameters of flame spraying of the NiAlMgSc coating are as follows: the oxygen pressure is 0.8 MPa; acetylene pressure is 1.15 MPa; the pressure of compressed air is 0.8 MPa; the spraying distance is 160 mm; the wire feeding speed is 1.75 m/min; the spraying angle is 90 degrees.
The coatings prepared in different examples were tested for section hardness, bond strength, porosity and corrosion resistance with the following results:
1. results of bond Strength test
The results of the composite coating bonding strength test developed according to the analysis of the invention (as shown in fig. 1) show that the bonding strength of the coatings prepared by the four examples is higher than the established technical index value (more than 20 MPa) and higher than the bonding strength of the traditional anti-corrosion electric arc spraying coating (Al coating, Zn15-Al coating) (about 28-30 MPa);
2. test results of section hardness
The results of the microhardness test of the cross section of the coating developed according to the present invention (as shown in FIG. 2) show that the microhardness values of the cross section prepared in the four examples are all higher than the established technical index value (higher than 300 HV)0.1）；
3. Porosity test results
The results of the porosity tests of the coatings developed according to the present invention, as shown in fig. 3, show that the porosities obtained by the implementation of the four examples are less than the established technical index value (less than 10%);
4. corrosion resistance test results
According to the results of the neutral salt spray corrosion test of the coating developed by the analysis of the invention (as shown in fig. 4), the corrosion resistance of the coatings prepared by the four examples is superior to the corrosion resistance of the conventional arc spraying coatings (Al coating, Zn coating and Zn15-Al coating), the surface condition of the coatings is good after long-time corrosion, the corrosion weight is not increased, and the phenomena of large-area corrosion products and local stripping appear on the surface of the conventional arc spraying coating. The corrosion resistance of the composite coating prepared by the invention is excellent.
Drawings
FIG. 1 is a graph showing the results of the interfacial bond strength test of the composite coating
FIG. 2 is a graph showing the results of a composite coating cross-sectional hardness test
FIG. 3 is a graph showing the results of porosity tests of composite coatings
FIG. 4 is a graph of the results of a neutral salt spray test of the arc sprayed coating and the composite coating.

Claims (2)

1. A flame spraying corrosion-resistant coating for a stainless steel pipe valve of a fluid system comprises a NiAlMgSc powder core wire material, and a NiAlMgSc spraying layer is prepared on the surface of a stainless steel matrix by adopting a flame spraying technology; the sheath of the flame sprayed NiAlMgSc powder core wire adopts a pure aluminum strip, and the powder core comprises the following components in percentage by mass: nickel: 15-20%; magnesium: 5-7%; scandium: 2-5%; boron: 1-3%; silicon: 1-3%; aluminum: and (4) the balance.
2. The method for preparing a flame-sprayed corrosion-resistant coating for a stainless steel pipe valve of a fluid system as claimed in claim 1, comprising the steps of:
(1) preparation of cored wire
1. Rolling a pure aluminum strip into a U shape, and adding the powder of the cored wire accounting for 25-30% of the weight of the cored wire into the U-shaped groove;
2. closing the U-shaped groove, coating the powder in the U-shaped groove, gradually drawing and reducing the diameter of the U-shaped groove through a wire drawing die, and finally preparing the flame spraying powder core wire material with the diameter of 3 mm;
(2) preparation of flame-sprayed NiAlMgSc coating
The surface of 316 stainless steel is cleaned by oil removal, rust removal, dirt removal and the like, and then is subjected to sand blasting roughening treatment, wherein the technological parameters of flame spraying of the NiAlMgSc coating are as follows: the oxygen pressure is 0.5-0.8 MPa; the acetylene pressure is 0.75-1.15 MPa; the pressure of the compressed air is 0.6-0.8 MPa; the spraying distance is 140 mm-160 mm; the wire feeding speed is 1.13-1.75 m/min; the spraying angle is 90 degrees.
CN201910240421.4A 2019-03-28 2019-03-28 Flame spraying corrosion-resistant coating for stainless steel pipe valve of fluid system Pending CN111748759A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910240421.4A CN111748759A (en) 2019-03-28 2019-03-28 Flame spraying corrosion-resistant coating for stainless steel pipe valve of fluid system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910240421.4A CN111748759A (en) 2019-03-28 2019-03-28 Flame spraying corrosion-resistant coating for stainless steel pipe valve of fluid system

Publications (1)

Publication Number Publication Date
CN111748759A true CN111748759A (en) 2020-10-09

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910240421.4A Pending CN111748759A (en) 2019-03-28 2019-03-28 Flame spraying corrosion-resistant coating for stainless steel pipe valve of fluid system

Country Status (1)

Country Link
CN (1) CN111748759A (en)

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Application publication date: 20201009