CN110468437A - A kind of preparation method of petroleum stainless steel pipes corrosion resistance structure - Google Patents

A kind of preparation method of petroleum stainless steel pipes corrosion resistance structure Download PDF

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Publication number
CN110468437A
CN110468437A CN201910755136.6A CN201910755136A CN110468437A CN 110468437 A CN110468437 A CN 110468437A CN 201910755136 A CN201910755136 A CN 201910755136A CN 110468437 A CN110468437 A CN 110468437A
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stainless steel
nickel
concentration
electrolyte
corrosion resistance
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CN110468437B (en
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郭卫东
牛宗伟
田佩佩
刘可峰
滕云龙
李丽
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Shengli Oil Field Jindao Industry Wins Island Petroleum Machinery Factory LLC
Shandong University of Technology
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Shengli Oil Field Jindao Industry Wins Island Petroleum Machinery Factory LLC
Shandong University of Technology
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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D15/00—Electrolytic or electrophoretic production of coatings containing embedded materials, e.g. particles, whiskers, wires
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D3/00—Electroplating: Baths therefor
    • C25D3/02—Electroplating: Baths therefor from solutions
    • C25D3/12—Electroplating: Baths therefor from solutions of nickel or cobalt
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D3/00—Electroplating: Baths therefor
    • C25D3/02—Electroplating: Baths therefor from solutions
    • C25D3/56—Electroplating: Baths therefor from solutions of alloys
    • C25D3/562—Electroplating: Baths therefor from solutions of alloys containing more than 50% by weight of iron or nickel or cobalt
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/10—Electroplating with more than one layer of the same or of different metals
    • C25D5/12—Electroplating with more than one layer of the same or of different metals at least one layer being of nickel or chromium
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/34—Pretreatment of metallic surfaces to be electroplated
    • C25D5/36—Pretreatment of metallic surfaces to be electroplated of iron or steel
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D7/00—Electroplating characterised by the article coated
    • C25D7/04—Tubes; Rings; Hollow bodies

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)

Abstract

The invention discloses a kind of preparation methods of petroleum stainless steel pipes corrosion resistance structure, belong to electrolysis or electrophoresis process technical field, it prepares preplating nickel electrolyte, (2) first time electro-deposition, (3) configuration low-surface-energy composite electrolyte through (1): by stearic acid and dehydrated alcohol, 1:100 is mixed into stearic acid ethanol solution by volume, add lauryl sodium sulfate and nanometer silicon carbide, then the pH value of solution is adjusted to 5 obtained composite electrolytes with stearic acid, and four step of (4) second of electro-deposition is made.Second of electro-deposition in the method is the hard dense coating that low-surface-energy is made in the composite electrolyte of low-surface-energy, on the one hand the silicon carbide being embedded in nickel cobalt (alloy) forms micro-nano dual asperity structure with nickel-phosphorus alloy, there is between water droplet air layer when contacting water droplet, hydrophobic structure is formed, corrosion resistance is improved；On the other hand the wearability that coating can be improved, improves its service life.

Description

A kind of preparation method of petroleum stainless steel pipes corrosion resistance structure
Technical field
The invention belongs to be electrolysed or electrophoresis process technical field, and in particular to a kind of petroleum stainless steel pipes corrosion resistance structure Preparation method.
Background technique
Metal material is due to being made into pipe fitting with good characteristics such as good electric conductivity, thermal diffusivity and easy processings It is widely used on various fields, especially oil field.However the chemical property of metal tube is more active, and quilt is easy in petroleum Corrosion, so as to shorten the life of pipe fitting.So mostly using the relatively good stainless steel tube of corrosion resistance, greatly to reduce base The corrosion efficiency of material, but still can be corroded over time.
In order to improve the corrosion resisting property of stainless steel, researcher is attempted by the inspiration of " lotus leaf effect " in nature in base Building has the coating of super hydrophobic surface on material, improves its corrosion resistance by reducing the attachment of liquid.Preparation is super at present The method of hydrophobic surface has sol-gel processing, anodizing, etching method and chemical deposition etc., but these methods exist surely It is qualitative it is poor, environmental pollution is serious and the binding force of coating and matrix is poor, really realize industrialized production.
Then, someone, which has studied, prepares super hydrophobic surface using electrodeposition process.201510527327.9 disclosure of Chinese invention A kind of preparation method in stainless steel base bionic super-hydrophobic graphene film, passes through electrodeposition process by substrate of stainless steel Being formed has the nickel film of micro nano structure as intermediate deposit, then uses CVD method in nickel plating stainless steel surface using it as catalyst The bionical graphene film for constructing micro-nano-scale bilayer hierarchical structure makes stainless steel have superhydrophobic characteristic.But the technique Equipment used is expensive, and preparation process is complicated, and reaction source and the residual air after reacting for participating in deposition are inflammable and explosive or even toxic.
Chinese invention 201710039436.5 provides a kind of super-hydrophobic stainless steel watch finishing coat and preparation method thereof, passes through Two-step method orients electric deposition nickel, copper or monel, has obtained the micro-nano structure in display arrangement, micro-nano knot in stainless steel surface Structure includes micron order pointed cone and nanoscale whisker, and nanoscale whisker forms petal-shaped knot to external radiation centered on micron order pointed cone Structure improves the corrosion resisting property of stainless steel using petal-like super-drainage structure then again through aoxidizing.Although the method is theoretically It can be improved the corrosion resistance of stainless steel, but technical process is not easy to control, is difficult that the micro-nano structure of rule is made, causes hydrophobicity Poor, service life is short.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of preparation method of petroleum stainless steel pipes corrosion resistance structure, energy Enough be made that hardness is high and coating with micro-nano dual structure, there is air layer between water droplet, and reduce surface from By energy, hydrophobic performance is improved jointly.
In order to solve the above technical problems, the technical scheme is that designing a kind of petroleum stainless steel pipes corrosion resistance structure Preparation method, it is characterised in that: the following steps are included:
(1) it prepares preplating nickel electrolyte: nickel sulfate and nickel chloride being put into portions of de-ionized water and stirred evenly, boron is then added Acid, add remaining deionized water be made preplating nickel electrolyte, concentration of the nickel sulfate in preplating nickel electrolyte be 150~ 200g/L, concentration of the nickel chloride in preplating nickel electrolyte are 20~30g/L, and the usage amount of boric acid makes preplating nickel electrolyte PH is 4；
(2) first time electro-deposition: stainless steel and pure nickel plate are placed in parallel in preplating nickel electrolyte made from step (1), no The cathode for steel connection working power of becoming rusty, pure nickel plate connect the anode of working power, and it is heavy to carry out electricity for the first time at being 50 DEG C in temperature Product 2min, then rinses the stainless steel of first time electro-deposition well with deionized water, and the current density of first time electro-deposition is 2~ 4A/dm2；
(3) configure low-surface-energy composite electrolyte: by stearic acid and dehydrated alcohol, 1:100 is mixed into stearic acid ethyl alcohol by volume Nickel sulfate and cobaltous sulfate are added into stearic acid ethanol solution and stirs evenly, add lauryl sodium sulfate and receives for solution Then the pH value of solution is adjusted to 5 obtained composite electrolytes, sulphur with stearic acid with magnetic stirrer 1h by rice silicon carbide Concentration of the sour nickel in composite electrolyte is 180~230g/L, and concentration of the cobaltous sulfate in composite electrolyte is 30~60g/L, Concentration of the lauryl sodium sulfate in composite electrolyte is 0.04~0.1g/L, and nanometer silicon carbide is dense in composite electrolyte Degree is 10g/L；
(4) second of electro-deposition: the stainless steel and pure nickel plate that handle through step (2) are placed in parallel in multiple made from step (3) Close electrolyte in, stainless steel connect working power cathode, pure nickel plate connect working power anode, temperature be 70 DEG C at into The stainless steel with super-hydrophobic nickel-cobalt-nSiC composite deposite, the electricity of second of electro-deposition is made in second of electro-deposition 30min of row Current density is 5~10A/dm2。
Further, concentration of the nickel sulfate in preplating nickel electrolyte is 175g/L in step (1), and nickel chloride is in nickel preplating Concentration in electrolyte is 25g/L.
Further, concentration of the nickel sulfate in composite electrolyte is 200g/L in step (3), and cobaltous sulfate is in combined electrolysis Concentration in liquid is 45g/L, and concentration of the lauryl sodium sulfate in composite electrolyte is 0.07g/L,
Further, the partial size of nanometer silicon carbide used is 40nm in step (1).
Further, in step (2) stainless steel between pure nickel plate at a distance from be 3cm.
Further, in step (4) stainless steel between pure nickel plate at a distance from be 3cm.
Further, stainless steel used passes through pre-treatment step in step (1), and pre-treatment step includes polishing: with 800~ The sand paper of 2000 mesh is polished, and the oxidation film on surface is removed, and is cleaned after being then cleaned by ultrasonic 10 min with alcohol with deionized water Completely, it is cleaned up after then being cleaned by ultrasonic 10 min with acetone with deionized water.
Further, pre-treatment step further includes alkali cleaning: the addition of sodium phosphate, sodium hydroxide, sodium metasilicate and sodium carbonate is gone Mixed solution is configured in ionized water, concentration of the sodium phosphate in mixed solution is 20~60g/L, and sodium hydroxide is in mixed solution In concentration be 5~15g/L, concentration of the sodium metasilicate in mixed solution is 10~20g/L, and sodium carbonate is dense in mixed solution Degree is 15~25g/L, and the stainless steel through polishing is put into alkali cleaning 3min in mixed solution, is then cleaned up with deionized water.
Further, pre-treatment step further includes acid-wash activation: the acetum acid-wash activation for being 20g/L with concentration is through alkali Stainless steel 2min after washing, is then cleaned up with deionized water, and hair dryer drying is stand-by.
Further, concentration of the sodium phosphate in the first mixed solution is 40g/L, and sodium hydroxide is in the first mixed solution Concentration be 10g/L, concentration of the sodium metasilicate in the first mixed solution is 15g/L, and sodium carbonate is dense in the first mixed solution Degree is 20g/L.
Compared with prior art, the beneficial effects of the present invention are:
1, it is handled due to first having carried out a nickel preplating before second of electro-deposition, stainless steel surface is avoided to generate oxide layer, Enhance the binding force between coating and matrix, and second of electro-deposition is carried out in the composite electrolyte with low-surface-energy , the hard dense coating with ground surface energy is made, silicon carbide one side and the nickel-phosphorus alloy shape being embedded in nickel cobalt (alloy) At micro-nano dual asperity structure, there is air layer when contacting water droplet between water droplet, form hydrophobic structure, improves anti-corrosion Property；On the other hand the wearability that coating can be improved, improves its service life.
2, because on the one hand the lauryl sodium sulfate in electrolyte can increase the wetability of nanometer silicon carbide, the group of reduction Poly- phenomenon, conducive to equably inlaying in the coating, is formed uniform so that nanometer silicon carbide is distributed more uniform in the electrolytic solution Micro-nano dual asperity structure, further increases hydrophobicity and wearability；On the other hand in its structure chain alkyl have dredge It is aqueous, the surface tension between plating solution and matrix can be reduced, the firmness of coating and nickel Coating combination is enhanced.
3, nickel ion slightly can be provided for electrolyte as the pure nickel plate of anode, increase cathodic polarization effect, promote Nickel deposition；The presence of chloride ion can prevent or reduce the passivation of pure nickel plate in electrolyte.
4, on the one hand the boric acid acid in electrolyte maintains the PH of composite plating bath, prevents the change dramatically of acidity, makes coating light It is bright, it is fine and close；On the other hand since boric acid has dissociation, preferably inhibit the hydrolysis of nickel sulfate, make electrodeposit reaction smooth It carries out.
5, when the pH value of electrolyte is 5, the comparision contents of each element are moderate in coating, and the corrosion resistance and wearability of coating are most By force.
6, since each electrolyte is molten into the stearic acid ethanol solution that can reduce low-surface-energy, being formed has low-surface-energy Coating, reduce the free energy on surface, further increase the hydrophobicity of coating, then improve its corrosion resisting property；And it is being formed Low-surface-energy modification has been carried out while coating, has saved preparation section, simplifies technique.
7, the stainless steel before electro-deposition is pre-processed, its surface impurity can be thoroughly removed, on the one hand reduce coating In impurity, improve the quality of coating；On the other hand it can enhance the binding force between coating and stainless steel base, keep coating secured Attachment, improves its durability.
8, due to use specific preparation process, can using micro-nano dual structure and low-surface-energy modification jointly come Hydrophobicity is improved, and improves the wear-resisting and corrosion resisting property of coating itself, convenient for promoting and applying in the art.
Specific embodiment
Present invention is further described in detail With reference to embodiment.
Embodiment one
The super-hydrophobic dual structure of stainless steel surface is made via following steps in the present embodiment:
(1) it prepares preplating nickel electrolyte: nickel sulfate and nickel chloride being put into portions of de-ionized water and stirred evenly, boron is then added Acid adds remaining deionized water and preplating nickel electrolyte is made, and concentration of the nickel sulfate in preplating nickel electrolyte is 150g/L, Concentration of the nickel chloride in preplating nickel electrolyte is 20g/L, and the usage amount of boric acid makes the pH of preplating nickel electrolyte be 4.
(2) it polishes: being polished with the sand paper of 800~2000 mesh, remove the oxidation film on surface, be then cleaned by ultrasonic with alcohol It is cleaned up after 10 min with deionized water, then is cleaned up after being cleaned by ultrasonic 10 min with acetone with deionized water.
(3) alkali cleaning: sodium phosphate, sodium hydroxide, sodium metasilicate and sodium carbonate being added in deionized water and are configured to mixed solution, Concentration of the sodium phosphate in mixed solution is 20g/L, and concentration of the sodium hydroxide in mixed solution is 5g/L, and sodium metasilicate is mixing Concentration in solution is 10g/L, and concentration of the sodium carbonate in mixed solution is 15g/L, and the stainless steel polished through step (2) is put Enter alkali cleaning 3min in mixed solution, is then cleaned up with deionized water.
(4) acid-wash activation: the acetum acid-wash activation for being 20g/L with concentration is through step (3) treated stainless steel Then 2min is cleaned up with deionized water, hair dryer drying is stand-by.
(5) stainless steel and pure nickel plate first time electro-deposition: are placed in parallel in preplating nickel electrolyte made from step (1) In, stainless steel connects the cathode of working power, and pure nickel plate connects the anode of working power, carries out for the first time when temperature is 50 DEG C Electro-deposition 2min, then rinses the stainless steel of first time electro-deposition well with deionized water, stainless steel between pure nickel plate at a distance from For 3cm, the current density of first time electro-deposition is 2A/dm2；
(6) configure low-surface-energy composite electrolyte: by stearic acid and dehydrated alcohol, 1:100 is mixed into stearic acid ethyl alcohol by volume Nickel sulfate and cobaltous sulfate are added into stearic acid ethanol solution and stirs evenly, add lauryl sodium sulfate and receives for solution Then the pH value of solution is adjusted to 5 obtained composite electrolytes, sulphur with stearic acid with magnetic stirrer 1h by rice silicon carbide Concentration of the sour nickel in composite electrolyte is 180g/L, and concentration of the cobaltous sulfate in composite electrolyte is 30g/L, dodecyl sulphur Concentration of the sour sodium in composite electrolyte is 0.04g/L, and concentration of the nanometer silicon carbide in composite electrolyte is 10g/L, nanometer The partial size of silicon carbide is 40nm；
(7) second of electro-deposition: the stainless steel and pure nickel plate that handle through step (2) are placed in parallel in multiple made from step (6) It closes in electrolyte, stainless steel connects the cathode of working power, and pure nickel plate connects the anode of working power, between stainless steel and pure nickel plate Distance be 3cm, temperature be 70 DEG C at carry out second of electro-deposition 30min, be made have super-hydrophobic nickel-cobalt-nSiC it is compound The stainless steel of coating, the current density of second of electro-deposition are 5~10A/dm2。
By the stainless steel of modification, connect using optical contact angle tester measurement deionized water in the static state of super hydrophobic surface Feeler is 157 °.Its coefficient of friction is 0.39, and the coefficient of friction of not electrodeposited stainless steel substrates is 0.53, it is seen that its is resistance to Mill property is more obvious better than before unmodified.It is the corrosion of the coating matrix of survey in 3.5% sodium chloride solution in mass percent concentration Electric current is 0.536 μ A/cm2, there is preferable corrosion resistance.
Embodiment two
The present embodiment and embodiment one the difference is that:
Concentration of the nickel sulfate in preplating nickel electrolyte is 175g/L in step (1), and nickel chloride is dense in preplating nickel electrolyte Degree is 25g/L.
Concentration of the sodium phosphate in mixed solution is 40g/L in step (3), and concentration of the sodium hydroxide in mixed solution is 10g/L, concentration of the sodium metasilicate in mixed solution are 15g/L, and concentration of the sodium carbonate in mixed solution is 20g/L.
The current density of first time electro-deposition is 3A/dm in step (5)2。
Concentration of the nickel sulfate in composite electrolyte is 200g/L in step (6), and cobaltous sulfate is dense in composite electrolyte Degree is 45g/L, and concentration of the lauryl sodium sulfate in composite electrolyte is 0.07g/L.
The current density of second of electro-deposition is 8A/dm in step (7)2。
By the stainless steel of modification, connect using optical contact angle tester measurement deionized water in the static state of super hydrophobic surface Feeler is 158 °.Its coefficient of friction is 0.37, and the coefficient of friction of not electrodeposited stainless steel substrates is 0.53, it is seen that its is resistance to Mill property is more obvious better than before unmodified.It is the corrosion of the coating matrix of survey in 3.5% sodium chloride solution in mass percent concentration Electric current is 0.542 μ A/cm2, there is preferable corrosion resistance.
Embodiment three
The present embodiment and embodiment one the difference is that:
Concentration of the nickel sulfate in preplating nickel electrolyte is 200g/L in step (1), and nickel chloride is dense in preplating nickel electrolyte Degree is 30g/L.
Concentration of the sodium phosphate in mixed solution is 60g/L in step (3), and concentration of the sodium hydroxide in mixed solution is 15g/L, concentration of the sodium metasilicate in mixed solution are 20g/L, and concentration of the sodium carbonate in mixed solution is 25g/L.
The current density of first time electro-deposition is 4A/dm in step (5)2。
Concentration of the nickel sulfate in composite electrolyte is 230g/L in step (6), and cobaltous sulfate is dense in composite electrolyte Degree is 60g/L, and concentration of the lauryl sodium sulfate in composite electrolyte is 0.1g/L.
The current density of second of electro-deposition is 10A/dm in step (7)2。
By the stainless steel of modification, connect using optical contact angle tester measurement deionized water in the static state of super hydrophobic surface Feeler is 159 °.Its coefficient of friction is 0.34, and the coefficient of friction of not electrodeposited stainless steel substrates is 0.53, it is seen that its is resistance to Mill property is more obvious better than before unmodified.It is the corrosion of the coating matrix of survey in 3.5% sodium chloride solution in mass percent concentration Electric current is 0.547 μ A/cm2, there is preferable corrosion resistance.
Stainless steel used is 304L type stainless steel in above-described embodiment.
The above described is only a preferred embodiment of the present invention, being not that the invention has other forms of limitations, appoint What those skilled in the art changed or be modified as possibly also with the technology contents of the disclosure above equivalent variations etc. Imitate embodiment.But without departing from the technical solutions of the present invention, according to the technical essence of the invention to above embodiments institute Any simple modification, equivalent variations and the remodeling made, still fall within the protection scope of technical solution of the present invention.

Claims (10)

1. a kind of preparation method of petroleum stainless steel pipes corrosion resistance structure, it is characterised in that: the following steps are included:
(1) it prepares preplating nickel electrolyte: nickel sulfate and nickel chloride being put into portions of de-ionized water and stirred evenly, boron is then added Acid, add remaining deionized water be made preplating nickel electrolyte, concentration of the nickel sulfate in preplating nickel electrolyte be 150~ 200g/L, concentration of the nickel chloride in preplating nickel electrolyte are 20~30g/L, and the usage amount of boric acid makes preplating nickel electrolyte PH value is 4；
(2) first time electro-deposition: stainless steel and pure nickel plate are placed in parallel in preplating nickel electrolyte made from step (1), no The cathode for steel connection working power of becoming rusty, pure nickel plate connect the anode of working power, and it is heavy that electricity for the first time is carried out when temperature is 50 DEG C Product 2min, then rinses the stainless steel of first time electro-deposition well with deionized water, and the current density of first time electro-deposition is 2~ 4A/dm2；
(3) configure low-surface-energy composite electrolyte: by stearic acid and dehydrated alcohol, 1:100 is mixed into stearic acid ethyl alcohol by volume Nickel sulfate and cobaltous sulfate are added into stearic acid ethanol solution and stirs evenly, add lauryl sodium sulfate and receives for solution Then the pH value of solution is adjusted to 5 obtained composite electrolytes, sulphur with stearic acid with magnetic stirrer 1h by rice silicon carbide Concentration of the sour nickel in composite electrolyte is 180~230g/L, and concentration of the cobaltous sulfate in composite electrolyte is 30~60g/L, Concentration of the lauryl sodium sulfate in composite electrolyte is 0.04~0.1g/L, and nanometer silicon carbide is dense in composite electrolyte Degree is 10g/L；
(4) second of electro-deposition: the stainless steel and pure nickel plate that handle through step (2) are placed in parallel in multiple made from step (3) Close electrolyte in, stainless steel connect working power cathode, pure nickel plate connect working power anode, temperature be 70 DEG C at into The stainless steel with super-hydrophobic nickel-cobalt-nSiC composite deposite, the electricity of second of electro-deposition is made in second of electro-deposition 30min of row Current density is 5~10A/dm2。
2. the preparation method of petroleum stainless steel pipes corrosion resistance structure described in accordance with the claim 1, it is characterised in that: step (1) Concentration of the middle nickel sulfate in preplating nickel electrolyte is 175g/L, and concentration of the nickel chloride in preplating nickel electrolyte is 25g/L.
3. the preparation method of petroleum stainless steel pipes corrosion resistance structure described in accordance with the claim 1, it is characterised in that: step (3) Concentration of the middle nickel sulfate in composite electrolyte is 200g/L, and concentration of the cobaltous sulfate in composite electrolyte is 45g/L, dodecane Concentration of the base sodium sulphate in composite electrolyte is 0.07g/L.
4. the preparation method of petroleum stainless steel pipes corrosion resistance structure described in accordance with the claim 1, it is characterised in that: step (1) In the partial size of nanometer silicon carbide used be 40nm.
5. the preparation method of petroleum stainless steel pipes corrosion resistance structure described in accordance with the claim 1, it is characterised in that: step (2) Middle stainless steel between pure nickel plate at a distance from be 3cm.
6. the preparation method of petroleum stainless steel pipes corrosion resistance structure described in accordance with the claim 1, it is characterised in that: step (4) Middle stainless steel between pure nickel plate at a distance from be 3cm.
7. according to the preparation method of any petroleum stainless steel pipes corrosion resistance structure of claim 1 to 6, it is characterised in that: Stainless steel used passes through pre-treatment step in step (1), and pre-treatment step includes polishing: it is polished with the sand paper of 800~2000 mesh, The oxidation film on surface is removed, is cleaned up after being then cleaned by ultrasonic 10 min with alcohol with deionized water, then is ultrasonic with acetone It is cleaned up after cleaning 10 min with deionized water.
8. the preparation method of petroleum stainless steel pipes corrosion resistance structure according to claim 7, it is characterised in that: pretreatment step Suddenly further include alkali cleaning: sodium phosphate, sodium hydroxide, sodium metasilicate and sodium carbonate being added in deionized water and are configured to mixed solution, phosphorus Concentration of the sour sodium in mixed solution is 20~60g/L, and concentration of the sodium hydroxide in mixed solution is 5~15g/L, sodium metasilicate Concentration in mixed solution is 10~20g/L, concentration of the sodium carbonate in mixed solution is 15~25g/L, will be polished Stainless steel is put into alkali cleaning 3min in mixed solution, is then cleaned up with deionized water.
9. the preparation method of petroleum stainless steel pipes corrosion resistance structure according to claim 8, it is characterised in that: pretreatment step Suddenly further include acid-wash activation: then stainless steel 2min of the acetum acid-wash activation for being 20g/L with concentration after alkali cleaning is spent Ionized water cleans up, and hair dryer drying is stand-by.
10. the preparation method of petroleum stainless steel pipes corrosion resistance structure according to claim 9, it is characterised in that: sodium phosphate Concentration in the first mixed solution is 40g/L, and concentration of the sodium hydroxide in the first mixed solution is 10g/L, and sodium metasilicate exists Concentration in first mixed solution is 15g/L, and concentration of the sodium carbonate in the first mixed solution is 20g/L.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111364086A (en) * 2020-04-20 2020-07-03 安徽宝立华机械设备有限公司 Nano metal ceramic electrodeposition coating of inner hole wall of petroleum drill rod and preparation method thereof

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