CN101042044A - Pumping rod or oil sucking pipe electroplating iron-nickel/tungsten alloy double-layer coating and surface processing technology - Google Patents
Pumping rod or oil sucking pipe electroplating iron-nickel/tungsten alloy double-layer coating and surface processing technology Download PDFInfo
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- CN101042044A CN101042044A CN 200710034268 CN200710034268A CN101042044A CN 101042044 A CN101042044 A CN 101042044A CN 200710034268 CN200710034268 CN 200710034268 CN 200710034268 A CN200710034268 A CN 200710034268A CN 101042044 A CN101042044 A CN 101042044A
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Abstract
It relates to a surface treatment process. It uses oxide inert electrodes as the anode to apply ferro plating. It uses ferric persulfate, nickel sulfate dip, nickel carbonate, boracic acid and citrate as the main material, the electrodeposition coating mainly composed of FexNiy, with x=20-45, y=55-80, being amorphous nanocrystalline structure. The coating is the bottom layer, then tungsten alloy to get the final dual layer plating surface treatment. The plating layer is corrosion resistant, with hardness of 480-950Hv, with extensive application.
Description
Technical field
The invention belongs to the oil field equipment technical field of surface, particularly relate to electroplating iron-nickel alloy and tungsten alloy coating and process of surface treatment thereof on oil pick-up tube, the sucker rod, in using, runs into mining site the difficult problem of two big world levels, corrosion and wearing and tearing to solve current oil recovery machiner.
Background technology
Sucker rod and oil pick-up tube are the oil recoveries that is used for the oil field.On mining site, run into the difficult problem of two big world levels: corrosion and wearing and tearing.Often contain CO in the well liquid
2, H
2Corrosive medium such as S and salt solution causes the sucker rod fatigue corrosion fracture, oil well pump and screw pump corrosion failure, and the tube corrosion perforation has a strong impact on crude oil production.Some pumpingh wells of hot oil recovery factory, Shengli Oil Tiandong County are because corrosion box cupling (45 steel, modifier treatment) work was just ruptured in three months.Some pumpingh wells of Zhongyuan Oil Field, fatigue corrosion fracture just took place in three months in sucker rod work.In inclined shaft (especially casing programme is the oil well of dog-leg shape), sucker rod and oil pipe generation eccentric wear usually grind off the wall of box cupling, the bar head of sucker rod or the some of the body of rod, and the oil pipe mill is leaked.
Plunger and pump barrel are a pair of friction pairs in the oil well pump, and stator and rotor are a pair of friction pairs in the screw pump.In oil pumping process, the well liquid that contains sand grains exists in the contact surface of these two kinds of friction pairs, has quickened wearing and tearing.
According to the mining site application experience, the damage of sucker rod, oil well pump and oil pipe is because the damage that corrosion and wearing and tearing cause accounts for more than 70%.The researcher of oil recovery machiner has carried out many research work at corrosion and wear problem over more than 100 year, and on sucker rod, as adopting corrosion resisting alloy: for example the K grade pumping rod adopts 20Ni2Mo, this Ni that contains, and Cr, the corrosion resisting alloy of Mo is more expensive; Adopt corrosion-inhibiting coating: comprise metal coating (for example heat is invaded aluminium, chromium plating, spraying nickel-base alloy) and nonmetallic coating (for example epoxy coating), the problem of existence: coating shedding, this sucker rod can not be used for inclined shaft; Adopt nonmetal: glass fiber reinforced plastic oil pumping rod, the carbon fibre composite coiled rod, these two kinds of sucker rods are somewhat expensive, and resistance to compression and anti-wear performance are relatively poor; Adopt corrosion inhibiter: somewhat expensive, antiseptic effect is undesirable; On oil pick-up tube, adopt the compound plating of nickel phosphorus; The undercoating technology; The bimetallic oil pipe; Nitriding; The frp lining oil pipe.Though obtained certain achievement, but problem does not solve also.
Summary of the invention
The purpose of this invention is to provide a kind of on sucker rod or oil pick-up tube the double-deck coating of electroplating iron-nickel/tungsten alloy, make both withstand corrosion of sucker rod and oil pick-up tube, again can be wear-resistant, satisfy the needs of mining site oil production equipment.
Another object of the present invention aims to provide a kind of plating and has withstand corrosion, again the process of surface treatment of coating that can be wear-resistant.
The objective of the invention is to realize by following manner:
A kind of on sucker rod or oil pick-up tube the double-deck coating of electroplating iron-nickel/tungsten alloy, by with the iron-nickel alloy coating of matrix bond, and the two-layer composition of outer field tungsten alloy coating; The component of this iron-nickel alloy coating is Fe
xNi
y, x=20-45 wherein, y=55-80; The coating component of described tungsten alloy is W-Ni-M, and M is iron or phosphorus or boron.
The W content that the coating of described tungsten alloy is formed is 5-45%, and the content of nickel is 35-85%, and in wt%, surplus is iron or phosphorus or boron.
The surface particles degree of this iron-nickel alloy coating is very tiny, even does not see tangible crystal boundary.Thin film crystallization crystal grain is tiny, belongs to nanocrystalline scope on the size and (sees Fig. 1: A); Distribute from Ni unit vegetarian noodles, can see in the Fe element mapping that Ni and Fe element evenly distribute at film surface, do not have the poly-partially phenomenon (seeing Fig. 1: B, C) of composition.The iron that obtains-nickel bianry alloy does not have simple metallic nickel and iron to exist, but is solvent with nickel, and iron is the substitutional solid solution (see figure 2) of solute.The coating component of tungsten alloy is W-Ni-M, and M can be an iron, also can be phosphorus, also boron.W content is 5-45%, and the content of nickel is 35-85%, and in wt%, surplus is iron or phosphorus or boron, and coating microhardness is 480-950Hv.
At first on sucker rod or oil pick-up tube, electroplate one deck iron-nickel alloy, and then on iron-nickel alloy coating, overlap last layer tungsten alloy coating.It is good that the iron-nickel alloy plating bath has a covering power, and the good toughness of coating with the good characteristics of steel substrate material adhesion, can form coating comparatively uniformly on the surface of comparatively coarse sucker rod and oil pick-up tube well, avoid the plating leakage phenomenon.Tungsten alloy coating has hardness height, characteristics that corrosion resistance is good, is suitable for the adverse circumstances of mining site.
Use tungsten alloy coating separately and use iron-nickel alloy coating that its unsurmountable shortcoming is all arranged separately.Concerning tungsten alloy coating, the covering power of plating bath is poor, electroplates on sucker rod and oil pick-up tube coarse surface like this, easily causes plating leakage, thereby does not reach the purpose of protection matrix; In order to make coating cover the surface of whole work-piece, the necessary thickness that increases coating can improve the surface-treated cost like this.Concerning iron-nickel alloy coating, the abrasion resistance of iron-nickel alloy coating itself and corrosion resistance ratio tungsten alloy are poor, and use can not be satisfied the needs of stope adverse circumstances separately.
Another object of the present invention realizes by following manner:
Technological process of the present invention is: after sucker rod or oil pick-up tube workpiece are carried out preliminary treatment, and hot water wash, cold wash, the workpiece activation, washing from the beginning, the deionization washing, electroplating iron-nickel alloy, the deionization washing, tungsten alloy plating, the deionization washing, hot water wash dries up.
Electroplating process adopts the oxide inert anode, and the current density of described electroplating iron-nickel alloy is 1-10A/dm
2, temperature is 45-80 ℃; The current density of tungsten alloy plating is 3-15A/dm
2, temperature is 45-80 ℃.
The tungsten alloy plating process also can adopt stainless steel anode.
In the above-mentioned activities plating, the more excellent operating condition of electroplating iron-nickel is: temperature 50-70 ℃, current density is 5-10A/dm
2, pH 2.5-3.5.The more excellent operating condition of tungsten alloy plating is: temperature 60-80 ℃, current density is 5-10A/dm
2Anode oxide inert anode (pH1.5-3.5) or stainless steel anode (pH 5.0-9.0).
Described electroplate liquid comprises iron-nickel alloy electroplate liquid and tungsten alloy electroplate liquid.
Wherein the component of iron-nickel alloy electroplate liquid is:
Ferrous sulfate 0.1-0.5mol/l, nickelous sulfate 0.2-1mol/l, boric acid 0.48-0.8mol/l, citrate 0.05-0.5mol/l.
The electroplate liquid component of tungsten alloy is:
Sodium tungstate 0.01-0.25mol/l, ferrous sulfate (or phosphorous acid) 0.015-0.3mol/l, nickelous sulfate 0.05-1mol/l, boric acid 0.1-0.8mol/l, citrate 0.05-0.5mol/l.
Adopt technology of the present invention, promptly pending surface of the work plates one deck layer of iron-nickel alloy now, puts tungsten alloy again.The outstanding advantage of this technology is: the first, utilize iron-nickel alloy plating bath covering power and covering power characteristics preferably, present pending surface of the work plates one deck iron-nickel alloy, with coarse surperficial Zhenping, and then the thing alloy layer of cover last layer wear-and corrosion-resistant, be difficult for causing plating leakage; The second, on apparent careful iron-nickel alloy coating, overlap tungsten alloy coating again, can obtain the tungsten alloy coating of compact structure, strengthened the protective capability of coating substrate.Experimental result shows, overlaps 10 microns tungsten alloys again after electroplating 10 microns iron-nickel alloys on the oil pick-up tube fragment, soaks a month non-corrosive through 5%NaCl; And without the bottoming of iron nickel, the oil pipe fragment of 20 microns tungsten alloys of Direct Electroplating soaks and promptly gets rusty after 5%NaCl24 hour; Three, tungsten alloy plating can be brought into play the wear-and corrosion-resistant effect of tungsten alloy better on iron-nickel alloy, satisfies the instructions for use of stope; Four, the iron-nickel alloy electroplating cost is cheap, plate cheap bottom earlier after, only need put very thin one deck tungsten alloy and get final product, saved electroplating cost.
The process that technology of the present invention is concrete is
1. the preliminary treatment of plating piece: electrochemical deoiling and electrolytic degreasing
2. hot water wash
3. cold wash
4. workpiece activation (pickling or etching)
5. washing from the beginning
6. deionization washing
7. electroplating iron-nickel alloy
Plating piece is put into the electroplating bath that the iron-nickel alloy electroplate liquid is housed and is electroplated after treatment, and current density is 1-10A/dm
2, temperature is 45-80 ℃, stirs, and anode oxide inert anode, pH 2.0-3.5, after having plated, flushing is transferred to next process.
8. deionization washing
9. tungsten alloy plating
The workpiece cleaning that is coated with iron-nickel alloy is put into the electroplating bath that the tungsten alloy electroplate liquid is housed after clean electroplate, current density is 3-15A/dm
2, temperature is 45-80 ℃, anode oxide inert anode (pH1.5-3.5) or stainless steel anode (pH 5.0-9.0).
10. deionization washing
The hot water wash
dries up
Product after having plated can carry out dehydrogenation to be handled.
In the above-mentioned activities plating, the more excellent operating condition of electroplating iron-nickel is: temperature 50-70 ℃, current density is 5-10A/dm
2, pH=2.0-3.5.The more excellent operating condition of tungsten alloy plating is: temperature 60-80 ℃, current density is 5-10A/dm
2
Characteristics of the present invention are, do and electroplate the bottoming technology of carrying out the iron-nickel alloy plating with anode with oxide inert electrode (as, titanium ruthenium coating metal oxide anode, contain iridium intermediate layer titanium ruthenium coating metal oxide anode, stanniferous-antimony intermediate layer titanium ruthenium coating metal oxide anode, contain the super coating metal anode of palladium hyperoxia etc.).Under these process conditions, electroplate degree layer even structure, the densification of coming out, apparent exquisiteness.And bibliographical information make anodization iron-nickel alloy technology with the soluble iron nickel electrode, coating, easily coarse, main salt concentration constantly raises, the plating solution maintenance difficulty; Among the present invention, propose to utilize the oxide inert electrode to do and electroplate with anode and carry out the iron-nickel alloy plating, main salt takes outside adding mode to carry out, and concentration is controlled, and plating solution maintenance is easy.Utilize the oxide inert electrode to do to electroplate and carry out the iron-nickel alloy electroplating technique with anode and do not appear in the newspapers; Utilize the iron-nickel alloy bottoming, the double-deck electroplating technology that overlaps tungsten alloy coating does not again appear in the newspapers; The technology of overlapping tungsten alloy again behind electroplating iron-nickel alloy on oil pick-up tube and the sucker rod is not appeared in the newspapers.The present invention overlaps last layer tungsten alloy coating again after powering on the deposited iron nickel alloy in sucker rod and oil pick-up tube, the sucker rod and the oil pick-up tube that can obtain anti-carbon dioxide, sodium chloride and sulfide corrosion (see Table 1: double-deck corrosion resistance coating); Coating and base material adhesion are good, and abrasion resistance is equivalent to or is better than hard chrome plating (see figure 3), bath stability.
| Sequence number | Interventions Requested | Standard-required | |
| 1 | Salt spray test | With the NaCl solution of 50g/L, 35 ℃ of temperature | 300 hours, be 10/7sB |
| 2 | 5％Na 2S solution soaks | Use 5%Na
2S solution, 25 ℃ of immersions of | 200 hours, no significant change |
| 3 | Carbon dioxide | Saturated CO 2, 60 ℃ of temperature | 72 hours, homogeneous corrosion speed was 0.01362mm/a, and corrosion inhibition rate is 99.5% |
| 10％CO 2, 60 ℃ of temperature | 72 hours, homogeneous corrosion speed was 0.00795mm/a, and corrosion inhibition rate is 96.88% | ||
| 4 | Mobil hydraulic oil soaks | Soak down for 25 ℃ in temperature with Mobil hydraulic oil | 152 hours, 1.403 μ m/ |
Description of drawings
Fig. 1: iron-nickel alloy coating surface topography (A), distribution diagram of element (B, C).
Fig. 2: Fe-Ni alloy coating XRD figure.
Fig. 3: under the water boundaries condition, the situation of change of rub the sassafras coefficient and the wear extent of sample of the present invention and chromium sample (the added load of 50,100,150 expressions is 50 grams, 100 grams, 150 grams).
The specific embodiment
Embodiments of the invention are intended to illustrate the present invention rather than limitation of the invention further.
Embodiment 1: the surfacing of oil pick-up tube, material: N80
1. the preparation of solution
The iron nickel plating solution:
Main raw material(s): ferrous sulfate, nickelous sulfate, boric acid, citrate, process for preparation: after adding half groove clear water, add each main salt component of plating bath of amount of calculation again, stir, use the ammoniacal liquor adjust pH, add clear water, make and to try plating to the scope of application.
The tungsten alloy electroplate liquid:
Main raw material(s): sodium tungstate, phosphorous acid, nickelous sulfate, boric acid, citrate, process for preparation: after adding half groove clear water, add each main salt component of plating bath of amount of calculation again, stir, add clear water, make and to try plating to the scope of application.
2. the preliminary treatment of plating piece
Electrochemical deoiling and electrolytic degreasing are arranged.
3. workpiece activation
In dilute sulfuric acid, soaked 1-2 minute
4. plating
Plating piece is put into electroplating bath after treatment,
The electroplating iron-nickel solution component is:
FeSO
4(0.2mol/l)+NiSO
4(0.4mol/l)+H
3cit(0.28mol/l)+H
3BO
3(0.5mol/l)
In current density is 7A/dm
2, adopt to contain iridium intermediate layer titanium ruthenium coating metal oxide anode, pH=3, temperature is electroplated down for 60 ℃, after having plated, deionized water rinsing 3 times.
The tungsten alloy plating solution component is:
Na
2WO
4(0.12mol/l)+NiSO
4(0.6mol/l)+H
3cit(0.19mol/l)+H
3PO
3(0.24mol/l)+
H
3BO
3(0.16mol/l)
In current density is 7A/dm
2, adopt to contain iridium intermediate layer titanium ruthenium coating metal oxide anode, pH=2.5, temperature is electroplated down for 60 ℃, and after having plated, deionized water rinsing 3 times dries up.
5. dehydrogenation
Product after having plated can 200 ℃ of dehydrogenase 12 h.
6. check
Check coating with visual method, the coating densification, comes off, peeling, phenomenon such as burns at free of pinholes; Through tensile test, coating does not have and comes off.Immerse in the 5%NaCl solution a month non-corrosive.Acid salt spray test 120 hours is rust not.Microhardness 750Hv.
The component of this iron-nickel alloy coating is Fe
45Ni
55, x=45y=55 (recording) wherein by EDX; The coating component of described tungsten alloy is W-Ni-M, and M is a phosphorus.W content is 5%, and the content of nickel is 85%, and (recording by EDX) all the other content are phosphorus.
Embodiment 2: the surfacing of oil pick-up tube, material: N80
1. the preparation of solution, 2. plating piece preliminary treatment, 3. workpiece activation, 5. dehydrogenation,
All identical with embodiment 1.Difference in step 4.
4. plating
Plating piece is put into electroplating bath after treatment,
The electroplating iron-nickel solution component is:
FeSO
4(0.5mol/l)+NiSO
4(1.0mol/l)+H
3cit(0.5mol/l)+H
3BO
3(0.8mol/l)
In current density is 10A/dm
2, adopt to contain iridium intermediate layer titanium ruthenium coating metal oxide anode, pH=2.0, temperature is electroplated down for 50 ℃, after having plated, deionized water rinsing 3 times.
The tungsten alloy plating solution component is:
Na
2WO
4(0.01mol/l)+NiSO
4(1.0mol/l)+H
3cit(0.19mol/l)+H
3PO
3(0.3mol/l)+H
3BO
3(0.16mol/l)
In current density is 7A/dm
2, adopt to contain iridium intermediate layer titanium ruthenium coating metal oxide anode, pH=1.5, temperature is electroplated down for 60 ℃, and after having plated, deionized water rinsing 3 times dries up.
6. check
Check coating with visual method, the coating densification, comes off, peeling, phenomenon such as burns at free of pinholes; Through tensile test, coating does not have and comes off.
Embodiment 3: the surfacing of oil pick-up tube, material: J55
1. the preparation of solution
The iron nickel plating solution:
Main raw material(s): ferrous sulfate, nickelous sulfate, boric acid, citrate, process for preparation: after adding half groove clear water, add each main salt component of plating bath of amount of calculation again, stir, use the ammoniacal liquor adjust pH, add clear water, make and to try plating to the scope of application.
The tungsten alloy electroplate liquid:
Main raw material(s): sodium tungstate, phosphorous acid, nickelous sulfate, boric acid, citrate, process for preparation: after adding half groove clear water, add each main salt component of plating bath of amount of calculation again, stir, add clear water, make and to try plating to the scope of application.
2. the preliminary treatment of plating piece
Electrochemical deoiling and electrolytic degreasing are arranged.
3. activation
In dilute sulfuric acid, soaked 1-2 minute
4. plating
Plating piece is put into electroplating bath after treatment,
The electroplating iron-nickel solution component is:
FeSO
4(0.18mol/l)+NiSO
4(0.45mol/l)+H
3cit(0.28mol/l)+H
3BO
3(0.5mol/l)
In current density is 7A/dm
2, adopt titanium ruthenium coating metal oxide anode, pH=3, temperature is electroplated down for 60 ℃, after having plated, the deionized water rinsing flushing.
The tungsten alloy plating solution component is:
Na
2WO
4(0.12mol/l)+NiSO
4(0.6mol/l)+H
3cit(0.19mol/l)+H
3PO
3(0.24mol/l)+H
3BO
3(0.16mol/l)
In current density is 7A/dm
2, adopt titanium ruthenium coating metal oxide anode, pH=3.5, temperature is electroplated down for 55 ℃, and after having plated, the deionized water rinsing flushing dries up.
5. dehydrogenation
Product after having plated can 200 ℃ of dehydrogenase 12 h.
6. check
Check coating with visual method, the coating densification, comes off, peeling, phenomenon such as burns at free of pinholes; Through tensile test, coating does not have and comes off.Immerse in the 5%NaCl solution a month non-corrosive.Acid salt spray test 120 hours is rust not.Microhardness 750Hv.
The component of this iron-nickel alloy coating is Fe
36Ni
64, x=36y=54 (recording) wherein by EDX; The coating component of described tungsten alloy is W-Ni-M, and M is a phosphorus.W content is 5%, and the content of nickel is 85% (recording by EDX), and all the other content are phosphorus.
Embodiment 4: the surfacing of oil pick-up tube, material: J55
1. the preparation of solution, 2. plating piece preliminary treatment, 3. workpiece activation, 5. dehydrogenation,
All identical with embodiment 3.Difference in step 4.
4. plating
Plating piece is put into electroplating bath after treatment,
The electroplating iron-nickel solution component is:
FeSO
4(0.1mol/l)+NiSO
4(0.25mol/l)+H
3cit(0.28mol/l)+H
3BO
3(0.5mol/l)
In current density is 5A/dm
2, pH=3.5, temperature is electroplated down for 70 ℃, after having plated, the deionized water rinsing flushing.
The tungsten alloy plating solution component is:
Na
2WO
4(0.12mol/l)+NiSO
4(0.6mol/l)+H
3cit(0.19mol/l)+H
3PO
3(0.1mol/l)+H
3BO
3(0.16mol/l)
In current density is 7A/dm
2, pH=3.5, temperature is electroplated down for 55 ℃, and after having plated, the deionized water rinsing flushing dries up.
6. check
Check coating with visual method, the coating densification, comes off, peeling, phenomenon such as burns at free of pinholes; Through tensile test, coating does not have and comes off.
Embodiment 5:
The surfacing of sucker rod, material: 20CrMo
1. the preparation of solution
The iron nickel plating solution:
Main raw material(s): ferrous sulfate, nickelous sulfate, boric acid, citrate, process for preparation: after adding half groove clear water, add each main salt component of plating bath of amount of calculation again, stir, use the ammoniacal liquor adjust pH, add clear water, make and to try plating to the scope of application.
The tungsten alloy electroplate liquid:
Main raw material(s): sodium tungstate, phosphorous acid (or ferrous sulfate), nickelous sulfate, boric acid, citrate, process for preparation: after adding half groove clear water, add each main salt component of plating bath of amount of calculation again, stir, add clear water, make and to try plating to the scope of application.
2. the preliminary treatment of plating piece
Preprocess method by existing electroplating technology can.
3. activation
Place sodium nitrate solution to carry out the activation of anode etching workpiece, current density is 7A/dm
2, adopt stainless steel anode pH5-9.
4. plating
Plating piece is put into electroplating bath after treatment,
The electroplating iron-nickel solution component is:
FeSO
4(0.15mol/l)+NiSO
4(0.69mol/l)+H
3cit(0.5mol/l)+H
3BO
3(0.5mol/l)
In current density is 7A/dm
2, adopt to contain iridium intermediate layer titanium ruthenium coating metal oxide anode, pH=3, temperature is electroplated down for 70 ℃, after having plated, the deionized water rinsing flushing.
The tungsten alloy plating solution component is:
Na
2WO
4(0.12mol/l)+NiSO
4(0.10mol/l)+H
3cit(0.19mol/l)+FeSO
4(0.04mol/l)+H
3BO
3(0.7mol/l)
In current density is 7A/dm
2, adopt stainless steel anode, pH=7.5, temperature is electroplated down for 75 ℃, after having plated, deionized water rinsing.
5. dehydrogenation
Product after having plated can 500 ℃ of dehydrogenase 12 h.
6. check
Check coating with visual method, the coating densification, comes off, peeling, phenomenon such as burns at free of pinholes; Through tensile test, coating does not have and comes off.Through the cassette salt spray test, nondiscolouring in 48 hours.Microhardness is 650Hv. through 500 degree heat treatments, and microhardness is 900Hv, and the component of this iron-nickel alloy coating is Fe
20Ni
80(recording) by EDX, x=20 wherein, y=80; The coating component of described tungsten alloy is W-Ni-M, and M is Fe.W content is 35%, and the content of nickel is 40% (recording by EDX), and all the other content are iron.
Embodiment 6: the surfacing of sucker rod, material: 20CrMo
1. the preparation of solution, 2. plating piece preliminary treatment, 3. workpiece activation, 5. dehydrogenation,
All identical with embodiment 5.Difference in step 4.
4. plating
Plating piece is put into electroplating bath after treatment,
The electroplating iron-nickel solution component is:
FeSO
4(0.15mol/l)+NiSO
4(0.69mol/l)+H
3cit(0.5mol/l)+H
3BO
3(0.5mol/l)
In current density is 7A/dm
2, adopt to contain iridium intermediate layer titanium ruthenium coating metal oxide anode, pH=3, temperature is electroplated down for 70 ℃, after having plated, the deionized water rinsing flushing.
The tungsten alloy plating solution component is:
Na
2WO
4(0.25mol/l)+NiSO
4(0.1mol/l)+H
3cit(0.19mol/l)+FeSO
4(0.015mol/l)+H
3BO
3(0.7mol/l)
In current density is 10A/dm
2, adopt stainless steel anode, pH=9.0, temperature is electroplated down for 75 ℃, after having plated, deionized water rinsing.
6. check
Check coating with visual method, the coating densification, comes off, peeling, phenomenon such as burns at free of pinholes; Through tensile test, coating does not have and comes off.
Claims (7)
1, a kind of on sucker rod or oil pick-up tube the double-deck coating of electroplating iron-nickel/tungsten alloy, it is characterized in that: by with the iron-nickel alloy coating of matrix bond, and the two-layer composition of outer field tungsten alloy coating.
2, according to claim 1 a kind of on sucker rod or oil pick-up tube the double-deck coating of electroplating iron-nickel/tungsten alloy, it is characterized in that: the component of described iron-nickel alloy coating is Fe
xNi
y, x=20-45 wherein, y=55-80; The coating component of described tungsten alloy is W-Ni-M, and M is iron or phosphorus or boron, and wherein, W content is 5-45%, and the content of nickel is 35-85%, and in wt%, surplus is iron or phosphorus or boron.
3, claim 1 described a kind of on sucker rod or oil pick-up tube the process of surface treatment of the double-deck coating of electroplating iron-nickel/tungsten alloy, it is characterized in that: after sucker rod or oil pick-up tube workpiece are carried out preliminary treatment, hot water wash, cold wash, the workpiece activation, washing from the beginning, deionization washing, electroplating iron-nickel alloy, the deionization washing, tungsten alloy plating, deionization washing, hot water wash dries up.
4, according to claim 3 a kind of on sucker rod or oil pick-up tube the process of surface treatment of the double-deck coating of electroplating iron-nickel/tungsten alloy, it is characterized in that: the electroplating iron-nickel alloy process adopts the oxide inert anode; The current density of described electroplating iron-nickel alloy is 1-10A/dm
2, temperature is 45-80 ℃; The current density of tungsten alloy plating is 3-15A/dm
2, temperature is 45-80 ℃.
5, according to claim 4 a kind of on sucker rod or oil pick-up tube the process of surface treatment of the double-deck coating of electroplating iron-nickel/tungsten alloy, it is characterized in that: the tungsten alloy plating process adopts oxide inert anode or stainless steel anode.
6, according to claim 3 a kind of on sucker rod or oil pick-up tube the process of surface treatment of the double-deck coating of electroplating iron-nickel/tungsten alloy, it is characterized in that: during electroplating iron-nickel, temperature 50-70 ℃, current density is 5-10A/dm
2, pH 2.0-3.5; During tungsten alloy plating, temperature 60-80 ℃, current density is 5-10A/dm
2Anode is that 1.5-3.5 or stainless steel anode are pH 5.0-9.0 with the pH of oxide inert anode.
7, according to claim 3 or 6 described a kind of on sucker rod or oil pick-up tube the process of surface treatment of the double-deck coating of electroplating iron-nickel/tungsten alloy, it is characterized in that: the component of the employed iron-nickel alloy electroplate liquid of electroplating iron-nickel alloy is:
Ferrous sulfate 0.1-0.5mol/l, nickelous sulfate 0.2-1mol/l, boric acid 0.48-0.8mol/l, citrate 0.05-0.5mol/l;
The electroplate liquid component of the employed tungsten alloy of tungsten alloy plating is:
Sodium tungstate 0.01-0.25mol/l, ferrous sulfate or phosphorous acid 0.015-0.3mol/l, nickelous sulfate 0.05-1mol/l, boric acid 0.1-0.8mol/l, citrate 0.05-0.5mol/l.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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