CN113430604A - Method for uniformly plating hard chromium on surface of GH4169 conical block gasket - Google Patents
Method for uniformly plating hard chromium on surface of GH4169 conical block gasket Download PDFInfo
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- CN113430604A CN113430604A CN202110707091.2A CN202110707091A CN113430604A CN 113430604 A CN113430604 A CN 113430604A CN 202110707091 A CN202110707091 A CN 202110707091A CN 113430604 A CN113430604 A CN 113430604A
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- 238000007747 plating Methods 0.000 title claims abstract description 99
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 title claims abstract description 89
- 229910052804 chromium Inorganic materials 0.000 title claims abstract description 70
- 239000011651 chromium Substances 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 title claims abstract description 49
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000004576 sand Substances 0.000 claims abstract description 21
- 238000007664 blowing Methods 0.000 claims abstract description 17
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 16
- 230000004913 activation Effects 0.000 claims abstract description 10
- 229910001245 Sb alloy Inorganic materials 0.000 claims abstract description 5
- 239000002140 antimony alloy Substances 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- WGLPBDUCMAPZCE-UHFFFAOYSA-N chromium trioxide Inorganic materials O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 claims description 13
- 238000005406 washing Methods 0.000 claims description 12
- 238000006356 dehydrogenation reaction Methods 0.000 claims description 11
- 238000005238 degreasing Methods 0.000 claims description 10
- 238000009713 electroplating Methods 0.000 claims description 9
- 238000005868 electrolysis reaction Methods 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 4
- 229910021586 Nickel(II) chloride Inorganic materials 0.000 claims description 3
- QMMRZOWCJAIUJA-UHFFFAOYSA-L nickel dichloride Chemical compound Cl[Ni]Cl QMMRZOWCJAIUJA-UHFFFAOYSA-L 0.000 claims description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 12
- 239000000463 material Substances 0.000 description 9
- 238000001994 activation Methods 0.000 description 8
- 239000011248 coating agent Substances 0.000 description 5
- 238000000576 coating method Methods 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- 238000002161 passivation Methods 0.000 description 4
- 239000010406 cathode material Substances 0.000 description 3
- 230000008021 deposition Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 238000002791 soaking Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 239000010431 corundum Substances 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- -1 preferably Inorganic materials 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
Images
Classifications
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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
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/34—Pretreatment of metallic surfaces to be electroplated
- C25D5/38—Pretreatment of metallic surfaces to be electroplated of refractory metals or nickel
- C25D5/40—Nickel; Chromium
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
- C25D17/10—Electrodes, e.g. composition, counter electrode
-
- 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
- C25D5/14—Electroplating with more than one layer of the same or of different metals at least one layer being of nickel or chromium two or more layers being of nickel or chromium, e.g. duplex or triplex layers
-
- 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
Abstract
The invention discloses a method for uniformly plating hard chromium on the surface of a GH4169 conical block gasket, which comprises the following steps: (1) carrying out sand blowing activation treatment on the surface of the GH4169 conical block gasket to ensure that the sand blowing surface is gray; (2) pre-nickel plating treatment is carried out on the part; (3) lead-antimony alloy is used as an anode, a part is used as a cathode, a round auxiliary cathode is arranged on the periphery of the part, the auxiliary cathode is connected with the part through a lead, and chromium plating is carried out. The method has simple process and easy realization, can form uniform and compact plating layers on the surfaces of GH4169 tapered block gaskets after chromium plating, and the thickness and the hardness of the plating layers meet the requirements.
Description
Technical Field
The invention relates to a surface treatment method, in particular to a method for uniformly plating hard chromium on the surface of a GH4169 conical block gasket.
Background
The GH4169 alloy is a nickel-based high-temperature alloy, can work for a long time at a high temperature of more than 600 ℃ under the action of certain stress, has excellent high-temperature strength, good oxidation resistance and hot corrosion resistance, good comprehensive properties such as fatigue property and fracture toughness, and is widely used for aircraft engine parts such as critical rotating parts, wings, supporting structures (gaskets), pressure chambers and the like.
GH4169 hardness is low, the room temperature hardness of standard heat treatment is HBS 346-450 (HV 352-463), and some design designs specify that the surface of the GH4169 material of the tapered block gasket is uniformly plated with hard chromium (HV 800-1100), and the thickness is required to be 15-35 μm. However, the chrome plating of the GH4169 material was not achieved by the conventional chrome plating method, and when the conventional hard chrome plating treatment (cathode activation → anodic corrosion → switching cathode → step up → rush current → drop to normal current) was performed using a test bar of the same material as the GH4169 conical piece shim, the test bar surface blackened with almost no chrome layer as shown in fig. 1. In practice, the inventor discovers that when a conventional chromium plating process is adopted to carry out chromium plating on a conical block gasket made of a common material, the schematic diagram of the obtained conical block gasket is shown in fig. 2, the cathode current efficiency is very low during the chromium plating process of the conventional chromium plating process, the cathode current efficiency is only 12% -15% during industrial production, and the chromium plating is 15-35 mu m on the surface of a part, but a chromium plating layer with the required thickness cannot be obtained due to the fact that the deposition speed of a near area at the inner right angle of the conical block gasket is slow during electroplating and the phenomenon of re-passivation exists, and the plating layers at the outer circle and the inner right angle are rough, so that the problem that the grinding is difficult after hard chromium plating exists.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: aiming at the problems in the prior art, the method for uniformly plating the hard chromium on the surface of the GH4169 conical block gasket is simple in process and easy to implement.
The inventor practically finds that when the GH4169 material workpiece is subjected to cathode activation, cathode activation and anode corrosion by adopting the conventional chromium electroplating process, the surface of the workpiece is blackened and has no plating layer, the chromium plating current efficiency is low, and chromium plating cannot be carried out in a low-current density area of the part. In addition, the inventor also discovers through practice that when the conventional chromium plating process is adopted to carry out chromium plating on the conical block gasket which is easy to be plated with chromium, the cathode current efficiency is very low and is only 12% -15% in industrial production, and the chromium plating is required to be 15-35 μm on the surface of a part, but the chromium plating layer with the required thickness is difficult to obtain due to the fact that the adjacent area of the inner right angle of the maximum radius circle of the conical block gasket is passivated again; and the coating at the sharp corners (protruding sharp corners) of the outer circle (maximum radius circle) and the inner circle (minimum radius circle) is rough and difficult to grind. The inventor finds that the phenomenon of re-passivation of the adjacent area at the inner right angle of the conical block gasket is probably caused by the fact that the deposition speed is slow during electroplating in the area, the reason that the deposition speed is slow during electroplating is caused by the fact that the adjacent area at the inner right angle is influenced by the shape into a low current area, and in addition, the phenomenon that the plating layers at the outer circle and the inner circle sharp angle of the conical block gasket are rough is probably caused by the fact that power lines are concentrated at the outer circle and the inner circle sharp angle of the area.
The inventor researches and adopts the following technical scheme to solve the technical problems:
a method for uniformly plating hard chromium on the surface of a GH4169 conical block gasket comprises the following steps:
(1) carrying out sand blowing activation treatment on the surface of the GH4169 conical block gasket to ensure that the sand blowing surface is gray;
(2) pre-nickel plating treatment is carried out on the part;
(3) lead-antimony alloy is used as an anode, a part is used as a cathode, a round auxiliary cathode is arranged on the periphery of the part, the auxiliary cathode is connected with the part through a lead, and chromium plating is carried out.
In the method for uniformly plating the hard chromium on the surface of the GH4169 conical block gasket, in the step (2), preferably, the nickel pre-plating solution used for the nickel pre-plating contains 200-250 g/L NiCl2·6H2O and 180-220 g/L HCl; the pre-plating nickel is carried out after the part is placed in a groove and is kept for 2-4 min, the electroplating time of the pre-plating nickel is 3-5 min, and the current density of electroplating is 5-10A/dm2。
The method for uniformly plating the hard chrome on the surface of the GH4169 conical block gasket preferably further comprises the step (3) of arranging a pictographic anode right above the low current density area of the part and connecting the pictographic anode with the anode by a lead before carrying out chrome plating.
In the method for uniformly plating the hard chromium on the surface of the GH4169 conical block gasket, in the step (2), the chromium plating solution for chromium plating preferably contains 200-250 g/L CrO3、2～2.5g/LH2SO4And 3 to 5g/LCr3+(ii) a The temperature of the chromium plating is 50-60 ℃, and the current density of the chromium plating is 50-55A/dm2。
In the method for uniformly plating the surface of the GH4169 conical block gasket with the hard chromium, preferably, CrO is plated in the chromium plating solution3And H2SO4The mass concentration ratio of (A) is 95-105.
In the method for uniformly plating the hard chrome on the surface of the GH4169 conical block gasket, preferably, in the step (1), the sand blowing activation conditions are as follows: the sand adopted by sand blowing is brown fused alumina with 100 meshes, the sand blowing pressure is not more than 2bar, and the nozzle distance is 150-300 mm.
The method for uniformly plating the hard chrome on the surface of the GH4169 conical block gasket preferably further comprises the step of washing the part between the step (1) and the step (2) so that the whole surface of the part is wetted, foreign matters on the surface of the part are removed, and a water film is not broken within 30 s;
and (3) a step of washing the part with water is further included between the step (2) and the step (3), the whole surface of the part is wetted, foreign matters on the surface of the part are removed, and the water film is not broken within 30 s.
The method for uniformly plating the hard chromium on the surface of the GH4169 conical block gasket preferably further comprises the step of performing dehydrogenation treatment on the chromium-plated part after the step (3); the dehydrogenation treatment is carried out within 10 hours of chromium plating, the temperature of the dehydrogenation treatment is 190 ℃, and the time of the dehydrogenation treatment is not less than 3 hours.
The method for uniformly plating the hard chromium on the surface of the GH4169 conical block gasket preferably further comprises the steps of sequentially washing the chromium-plated part with cold water and hot water to remove chromic anhydride on the surface of the gasket after the dehydrogenation treatment, and then drying.
The method for uniformly plating the hard chrome on the surface of the GH4169 conical block gasket preferably further comprises the step of performing electrolytic pre-degreasing treatment on the part before the step (1), wherein the electrolytic pre-degreasing treatment is as follows: electrolyzing the part as a cathode for 4-6 min, and then electrolyzing the part as an anode for 3-5 min at the electrolysis temperature of 60-90 ℃ and the current density of electrolysis of 5-10A/dm2. The inventors found that when cathodic electrolytic degreasing is performed, the plated parts are in a cathodic state in which hydrogen embrittlement of the parts and impurity precipitation are likely to occur; when anodic electrolysis is adopted for oil removal, the part is in an anodic state, and anodic dissolution can be generated on the surface of the part in the anodic state. According to the invention, by carrying out cathodic electrolysis degreasing firstly, a large amount of grease on the surface of the part can be removed rapidly, and then the electrolytic degreasing is converted into anodic electrolysis degreasing, hydrogen permeated into metal can be discharged in a short time, and impurities deposited on the surface of the part can be dissolved, so that the part can obtain a clean surface.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, through the processes of sand blowing activation, nickel preplating and chromium plating by arranging the circular protective cathode at the periphery of the part, not only is the blackening of the surface of the part avoided, but also the effective and uniform chromium plating can be carried out on the whole surface of the part, and the hardness of the plating layer reaches the standard; the process technology of the invention is reasonable, the thickness of the GH4169 conical block gasket after hard chromium plating is effectively controlled, and technical reference is provided for uniform hard chromium plating of parts with similar materials and structures.
2. The invention effectively solves the problems of surface blackening caused by cathode activation and anode corrosion before the chromium plating of the part by reasonably controlling the sand blowing activation process parameters; by controlling the technological parameters of the nickel preplating process, setting the protective cathode and the pictographic anode and controlling the setting positions of the protective cathode and the pictographic anode, the problem that parts cannot be subjected to chromium plating due to passivation can be effectively solved, the problem that parts cannot be subjected to chromium plating due to passivation in low current areas can be effectively solved, contact points can be reduced, accurate control over current distribution is achieved, uniform hard chromium plating on the surfaces of the parts is guaranteed, and the problem of difficulty in grinding caused by the fact that tip effects are generated on the sharp edges of the parts when the conical block gaskets of the parts are subjected to hard chromium plating is effectively solved.
Drawings
FIG. 1 is a topographic map of a GH4169 material test bar subjected to chromium plating by adopting a conventional chromium plating process.
FIG. 2 is a diagram showing the appearance of a tapered block washer made of a material susceptible to chromium plating after chromium plating by a conventional chromium plating process.
FIG. 3 is a cross-sectional view of a tapered block shim.
Fig. 4 is a schematic top view of the parts mount in embodiment 1.
FIG. 5 is a bottom view of a GH4169 tapered block shim after being chrome plated using the method of example 1.
FIG. 6 is a top view of a GH4169 taper block shim after being chrome plated using the method of example 1.
Description of the drawings:
1. the inner right angle of the maximum radius circle of the conical block gasket; 2. the conical block gasket has a convex sharp corner of the maximum radius circle and the minimum radius circle.
Detailed Description
The invention is further described below with reference to specific preferred embodiments, without thereby limiting the scope of protection of the invention.
Example 1
A method for uniformly plating hard chromium on the surface of a GH4169 conical block gasket comprises the following steps:
(1) pre-degreasing parts: electrolytic degreasing is carried out at the temperature of 60-90 ℃ and the current density of 5-10A/dm2Electrolyzing the part as a cathode for 3-5 min, then electrolyzing the part as an anode for 2-3 min, and using an iron plate or a nickel-plated iron plate for an oil removing polar plate.
(2) Sand blowing and activating: the parts are placed in a sand blower to clean the carburized surfaces of the runway and the tooth part, and the sand: 100 meshes of brown corundum, the pressure is less than or equal to 2bar, and the nozzle distance is as follows: 150-300 mm, and the sand blowing surface is ensured to be gray after sand blowing. Under the condition, the surface of the part can be effectively activated, rust, oxide skin and residual dirt on the surface of the part are removed, and the roughness of the surface of the part is reduced, so that the binding force of a coating is improved;
(3) washing with water: washing with water at normal temperature for 1-3 min, soaking the whole surface of the part with water, removing foreign matters on the surface of the part, and preventing the water film from breaking within 30 s;
(4) pre-nickel plating treatment of parts: the formula of the nickel preplating solution comprises the following components: 200-250 g/L NiCl2·6H2O and 180-220 g/L HCl, keeping for 2-4 min after the parts are put into a groove for corrosion, and then electrifying and electroplating for 3-5 min at a current density of 5-10A/dm2；
(5) Washing with water: washing with water at normal temperature for 1-3 min, soaking the whole surface of the part with water, removing foreign matters on the surface of the part, and preventing the water film from breaking within 30 s;
(6) and (3) chromium plating: the electro-chromic method comprises the following steps that electro-chromic is carried out by taking lead-antimony alloy as an anode, a part GH4169 conical block gasket as a cathode, the sectional view of the part GH4169 conical block gasket is shown in figure 3, a round auxiliary cathode is arranged on the periphery of the part, the round auxiliary cathode is connected with the part, copper wires are selected as auxiliary cathode materials, and the auxiliary cathode materials can be connected with electrolytic cathode parts by extending the copper wires of the auxiliary cathode materials; an image anode is arranged above an inner right angle (namely a low current density area) of the maximum diameter position of a part gasket and is connected with the anode, lead-antimony alloy is preferably selected as the material of the image anode, a schematic diagram of part mounting and hanging shown in figure 4 is adopted, an inner ring of the part is supported by an elastic clamp, the elastic clamp is used for fixing the part through three contact points, the clamp is used for mounting and hanging the part and is a conductive tool, the three contact points are designed to effectively prevent the part from shaking, and the chromium plating bath solution contains CrO3(chromic anhydride) 200-250 g/L, H2SO42-2.5 g/L and Cr3+3-5 g/L of CrO in the chromium plating bath solution3And H2SO4The mass concentration ratio of the chromium plating solution is 95-105, the temperature of the chromium plating bath solution is 50-60 ℃, and the current density is 50-55A/dm2；
(7) And (3) cold water washing: at room temperature for 1-3 min, soaking the whole surface of the part with water, and removing chromic anhydride on the surface of the part;
(8) hot water washing: the temperature is 50-60 ℃, the time is 1-3 min, all the surfaces of the parts are wetted, the chromic anhydride on the surfaces of the parts is further removed, and the surfaces of the parts are convenient to dry;
(9) and (3) drying: drying the surface of the part by compressed air;
(10) hydrogen removal: and (4) carrying out dehydrogenation treatment within 10 hours after plating, wherein the temperature is 190 ℃, and the time is more than or equal to 3 hours, so as to eliminate the risk of hydrogen embrittlement possibly generated.
The GH4169 conical block gasket plated with chromium according to the present invention is shown in bottom view and top view in FIGS. 5 and 6, respectively, and it was found by inspection that: a) visual inspection under natural scattered light or white transmitted light without reflected light. Inspecting the appearance of the conical block washer, and having a coating on all surfaces, includingThe low current region at the inner right angle is also covered with a coating. b) Pre-plating requirements for conical block gaskets
Post-plating requirements
The minimum size was found to be 3.042mm, the maximum size was found to be 3.046mm, the average size was found to be 3.050mm, and the chromium layer was found to be uniform. c) According to the specification of HB 5041, heating a part or a sample to 300 +/-10 ℃ by using an air furnace, preserving heat for 1h, then quenching in cold water, and inspecting by a visual method, wherein a plating layer does not foam and fall off; d) the hardness of the coating is detected to be HV 820-.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (10)
1. A method for uniformly plating hard chromium on the surface of a GH4169 conical block gasket is characterized by comprising the following steps:
(1) carrying out sand blowing activation treatment on the surface of the GH4169 conical block gasket to ensure that the sand blowing surface is gray;
(2) pre-nickel plating treatment is carried out on the part;
(3) lead-antimony alloy is used as an anode, a part is used as a cathode, a round auxiliary cathode is arranged on the periphery of the part, the auxiliary cathode is connected with the part through a lead, and chromium plating is carried out.
2. The method for uniformly plating hard chromium on the surface of the GH4169 conical block gasket as claimed in claim 1, wherein in the step (2), the nickel pre-plating solution adopted by the nickel pre-plating contains 200-250 g/L NiCl2·6H2O and 180-220 g/L HCl;
the nickel preplating is carried out after the part is placed in a groove and is kept for 2-4 min, and the electroplating time of the nickel preplating is3-5 min, and the current density of electroplating is 5-10A/dm2。
3. The method for uniformly plating hard chrome on the surface of GH4169 conical block gasket of claim 1, wherein in step (3), before the chrome plating, the method further comprises the steps of arranging a pictographic anode right above the low current density region of the part conical block gasket and connecting the pictographic anode with the anode by a lead.
4. The method for uniformly plating hard chromium on the surface of GH4169 conical block gasket as claimed in any one of claims 1 to 3, wherein in the step (3), the chromium plating solution for chromium plating contains 200 to 250g/L CrO3、2～2.5g/LH2SO4And 3 to 5g/LCr3+(ii) a The temperature of the chromium plating is 50-60 ℃, and the current density of the chromium plating is 50-55A/dm2。
5. The method for uniformly plating hard chrome on the surface of GH4169 conical block gasket as claimed in claim 4, wherein in the chrome plating solution, CrO3And H2SO4The mass concentration ratio of (A) is 95-105.
6. The method for uniformly plating hard chrome on the surface of the GH4169 conical block gasket as claimed in any one of claims 1 to 3, wherein in the step (1), the sand blowing activation conditions are as follows: the sand adopted by sand blowing is brown fused alumina with 100 meshes, the sand blowing pressure is not more than 2bar, and the nozzle distance is 150-300 mm.
7. The method for uniformly plating hard chromium on the surface of the GH4169 conical block gasket as claimed in any one of claims 1 to 3, wherein the method further comprises the step of washing the part with water between the step (1) and the step (2);
and (3) a step of washing the part with water is further included between the step (2) and the step (3).
8. The method for uniformly plating hard chromium on the surface of the GH4169 conical block gasket as claimed in any one of claims 1 to 3, wherein the method further comprises the step of performing dehydrogenation treatment on the chromium-plated part after the step (3); the dehydrogenation treatment is carried out within 10 hours after the chromium plating, the temperature of the dehydrogenation treatment is 180-200 ℃, and the time of the dehydrogenation treatment is not less than 3 hours.
9. The method for uniformly plating hard chrome on the surface of GH4169 cone-block gasket of claim 8, which further comprises the step of washing the chrome plated part to remove chromic anhydride on the surface of the gasket and then drying the washed chrome plated part after the dehydrogenation treatment.
10. The method for uniformly plating hard chromium on the surface of the GH4169 conical block gasket as claimed in any one of claims 1 to 3, wherein before the step (1), the method further comprises the step of carrying out electrolytic pre-degreasing treatment on the part, wherein the electrolytic pre-degreasing treatment is as follows: electrolyzing the part as a cathode for 4-6 min, and then electrolyzing the part as an anode for 3-5 min; the electrolysis temperature is 60-90 ℃, and the current density of electrolysis is 5-10A/dm2。
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115110073A (en) * | 2022-06-16 | 2022-09-27 | 中国航发贵州黎阳航空动力有限公司 | Chemical nickel plating method for nickel-based superalloy |
Citations (8)
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