CN106245082A - A kind of chrome-plating method of diameter-variable parts endoporus - Google Patents

A kind of chrome-plating method of diameter-variable parts endoporus Download PDF

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Publication number
CN106245082A
CN106245082A CN201610781325.7A CN201610781325A CN106245082A CN 106245082 A CN106245082 A CN 106245082A CN 201610781325 A CN201610781325 A CN 201610781325A CN 106245082 A CN106245082 A CN 106245082A
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China
Prior art keywords
diameter
anode
anode stub
chrome
section
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CN201610781325.7A
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CN106245082B (en
Inventor
张曙娟
薛晓明
郭俊文
王瑞栋
高志红
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Shanxi North Machine Building Co Ltd
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Shanxi North Machine Building Co Ltd
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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
    • C25D7/00—Electroplating characterised by the article coated
    • C25D7/04—Tubes; Rings; Hollow bodies
    • 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
    • C25D17/12—Shape or form
    • 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
    • C25D3/04—Electroplating: Baths therefor from solutions of chromium

Abstract

The invention discloses the chrome-plating method of a kind of diameter-variable parts endoporus, described inner bore of part includes conical bore section and straight hole section, and the small end of conical bore connects with straight hole section and diameter is identical, cleans inner bore of part surface, respectively connect one section of extension spray lance at part two ends, preheat in part is promoted to coating bath；Use anode stub to carry out chromium plating, regulate anode stub original position, carry out anodising, then electroplating power supply is adjusted to forward chromium plating；Progressively rising to normal process conditions electric current density, anode stub pumps on inner bore of part surface, is reached the thickness of coating set by the size and anode stub reciprocal time controlling output electric current.The present invention can effectively ensure that anode stub is maintained at Central of the parts, coaxial with part.There is the effect improving thickness of coating uniformity.

Description

A kind of chrome-plating method of diameter-variable parts endoporus
Technical field
The invention belongs to electroplating technology field, relate to the chrome-plating method of a kind of diameter-variable parts endoporus.
Background technology
Conical bore section and the part of straight hole section, at one end variable cross-section are divided into for existing diameter-variable parts, especially endoporus Conical bore section part hole in chromium plating, the endoporus portion coating of straight hole section is thicker, and the coating of conical bore section is relatively thin, be 0.04～ The milky white chromium of 0.08mm.Use the mobile anode chrome-plating method in double location at present, there is the problem that thickness of coating deviation is big.After chromium plating The lack of homogeneity of cylindrical section coating, axial-radial thickness deviation is 0.02mm to the maximum,
The mobile anode chrome-plating method in double location is applicable to the chromium plating of same footpath part.Principle is: a length of 400mm during chromium plating Anode stub moves back and forth up and down at pipe fitting endoporus under the drive of elevating mechanism, and electrolyte quickly flows between anode and cathode, arrives The time of regulation reaches thickness requirement.Coating uniformity is mainly by the guarantee of two fairleads at two ends.If by mobile for double location Anode chrome-plating method is for the diameter-variable parts chromium plating of band conical bore section.Existing problems are: when anode stub moves to part varying diameter portion Timesharing, anode stub is become a point location from two-point locating, it is impossible to ensures to hit exactly in straight hole section, thus affects coating uniformity.
Summary of the invention
It is an object of the invention to provide the chrome-plating method of a kind of diameter-variable parts endoporus, solve the mobile anode chromium plating in double location and exist During the endoporus of plating tape variable cross-section, the problem that there is thickness of coating lack of homogeneity.
The technical scheme is that the chrome-plating method of a kind of diameter-variable parts endoporus, it is characterised in that: described inner bore of part Including conical bore section and straight hole section, the small end of conical bore connects with straight hole section and diameter is identical, and its concrete steps include:
Step one, cleaning inner bore of part surface, respectively connect one section of extension spray lance, the internal diameter of extension spray lance and part at part two ends The internal diameter of straight hole section is identical；By parts fixation on chromium plating cathode hanging fixture；
Step 2, it is promoted to part in coating bath preheat；
Step 3, employing anode stub carry out chromium plating, and described anode stub includes insulating segment and conductive segment, insulating segment and conductive segment Being respectively provided with two insulation fairleads, the external diameter of this fairlead matches with the internal diameter of the straight hole section of part；Conductive segment energy during chromium plating Enough cross the conical bore section of part, it is ensured that anode and the axiality of straight hole；
Rapid four, regulation anode stub original position, carries out anodising, then electroplating power supply is adjusted to forward chromium plating；Progressively Rising to normal process conditions electric current density, anode stub pumps on inner bore of part surface, by controlling output electric current Size and anode stub reciprocal time reach set thickness of coating.
Step 5, electroplated after, part is hung out and dismantles after chrome-plating bath, rinse bore area and also deliver for a check.
Beneficial effect: the present invention can effectively ensure that anode stub is maintained at Central of the parts, coaxial with part.There is raising plating The effect of layer thickness homogeneity.
Accompanying drawing explanation
Fig. 1 is the structural representation of anode stub；
Fig. 2 is diameter-variable parts structural representation.
Detailed description of the invention
For making the purpose of the present invention, content and advantage clearer, the detailed description of the invention of the present invention is made the most in detail Thin description.
The present invention provides the chrome-plating method of a kind of diameter-variable parts endoporus, and described inner bore of part includes conical bore section and straight hole Section, the small end of conical bore connects with straight hole section and diameter is identical, and its concrete steps include:
Step one, cleaning inner bore of part surface, respectively connect one section of extension spray lance, the internal diameter of extension spray lance and part at part two ends The internal diameter of straight hole section is identical；By parts fixation on chromium plating cathode hanging fixture；
Step 2, part is promoted in coating bath, preheats 10min；
Step 3 is as it is shown in figure 1, lengthen anode stub to 1200mm, its effective length 400mm, and remainder insulate, sun Extremely rod includes that insulating segment 2 and conductive segment 3, insulating segment 2 and conductive segment 3 are respectively provided with two insulation fairleads 1, the external diameter of this fairlead Match with the internal diameter of the straight hole section of part；
During chromium plating, conductive segment can cross the conical bore section of part, it is ensured that anode and the axiality of straight hole, and then ensures coating Thickness evenness.Simultaneously for ensureing effective conduction of electroplating power supply and anode cable, anode cable is connected with hoist engine cylinder, Gu The copper coin being scheduled on hoist engine cylinder is connected with electroplating power supply positive pole, by conduction carbon brush group and the anode electricity being wrapped on reel Cable conducting electric current.2 fairleads are increased, it is ensured that anode is vertical at conical bore section running, coaxial with straight hole section on anode stub.
Step 4, the mobile anode chromium plating control system of startup, arrange anode stroke, bath temperature and electroplating time, regulation Anode stub original position；Restart electroplating power supply, carry out 50s " anodising " (also known as anti-electricity, i.e. using part as anode, Using anode stub as negative electrode), then electroplating power supply is adjusted to forward chromium plating；Progressively rise to normal process conditions electric current density, sun Extremely rod inner bore of part surface pumps, and reaches to set by the size and anode stub reciprocal time controlling output electric current Thickness of coating.
Step 5, electroplated after, closing control mechanism and power supply, part is hung out and dismantles after chrome-plating bath, rinse endoporus Surface is also delivered for a check.
The main technologic parameters of said method is as follows:
Bath temperature: 70 ± 4 DEG C
Electric current density: anodising: 35A/dm2, forward chromium plating: 45A/dm2
Anode stub reciprocates speed: 1m/min
Anode stub length: 1200mm
Solution composition: chromic anhydride 150-180g/L；Cr3+: 3-5g/L
Upper and lower fairlead and straight hole section tube wall gap: 1mm
Use the inventive method, be 0.01mm according to metallographic thickness measuring method coating axial-radial thickness maximum deflection difference value, and pass System method thickness maximum deflection difference value is 0.02mm.

Claims (6)

1. the chrome-plating method of a diameter-variable parts endoporus, it is characterised in that: described inner bore of part includes conical bore section and straight hole section, The small end of conical bore connects with straight hole section and diameter is identical, and its concrete steps include:
Step one, cleaning inner bore of part surface, respectively connect one section of extension spray lance, the internal diameter of extension spray lance and the straight hole of part at part two ends The internal diameter of section is identical；By parts fixation on chromium plating cathode hanging fixture；
Step 2, it is promoted to part in coating bath preheat；
Step 3, employing anode stub carry out chromium plating, and described anode stub includes that insulating segment and conductive segment, insulating segment and conductive segment respectively set Two insulation fairleads, the external diameter of this fairlead are had to match with the internal diameter of the straight hole section of part；During chromium plating, conductive segment can be got over Cross the conical bore section of part, it is ensured that anode and the axiality of straight hole；
Step 4, regulation anode stub original position, carry out anodising, then electroplating power supply be adjusted to forward chromium plating；Progressively rise To normal process conditions electric current density, anode stub pumps on inner bore of part surface, by controlling output electric current Size and anode stub reciprocal time reach the thickness of coating set.
Step 5, electroplated after, part is hung out and dismantles after chrome-plating bath, rinse bore area and also deliver for a check.
The chrome-plating method of a kind of diameter-variable parts endoporus the most according to claim 1, it is characterised in that: in step 2, by zero The preheating time of part is 10min.
The chrome-plating method of a kind of diameter-variable parts endoporus the most according to claim 1, it is characterised in that: in step 3, anode Cable is connected with hoist engine cylinder, and the copper coin being fixed on hoist engine cylinder is connected with electroplating power supply positive pole, by conduction carbon brush Group and the anode cable conducting electric current being wrapped on reel.
The chrome-plating method of a kind of diameter-variable parts endoporus the most according to claim 1, it is characterised in that: in step 4: plating solution Temperature is 70 ± 4 DEG C, and the electric current density of anodising is: 35A/dm2, the electric current density of forward chromium plating is: 45A/dm2, anode stub Reciprocate speed: 1m/min, a length of 1200mm of anode stub.
5. according to the chrome-plating method of a kind of diameter-variable parts endoporus described in any one of Claims 1 to 4, it is characterised in that: guide Set and straight hole section tube wall gap are 1mm.
6. according to the chrome-plating method of a kind of diameter-variable parts endoporus described in claim 1 or 4, it is characterised in that: in step 4, sun Pole is processed as a part as anode, using anode stub as negative electrode.
CN201610781325.7A 2016-08-30 2016-08-30 A kind of chrome-plating method of diameter-variable parts endoporus Active CN106245082B (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106757259A (en) * 2016-12-27 2017-05-31 兰州空间技术物理研究所 A kind of device for the different size uniform differential arc oxidation of alloy shoulder hole
CN106835218A (en) * 2017-02-27 2017-06-13 中钢集团西安重机有限公司 A kind of anode variable motion formula electroplanting device
CN111118560A (en) * 2019-12-16 2020-05-08 山西北方机械制造有限责任公司 Chromium plating method for driving plate
CN111962120A (en) * 2020-08-18 2020-11-20 重庆佰鸿机械设备有限公司 Pipe fitting inner wall surface treatment process
CN112442716A (en) * 2020-12-04 2021-03-05 四川华庆机械有限责任公司 Chromium plating method

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106757259A (en) * 2016-12-27 2017-05-31 兰州空间技术物理研究所 A kind of device for the different size uniform differential arc oxidation of alloy shoulder hole
CN106757259B (en) * 2016-12-27 2019-02-19 兰州空间技术物理研究所 A kind of device for the different uniform differential arc oxidations of size alloy stepped hole
CN106835218A (en) * 2017-02-27 2017-06-13 中钢集团西安重机有限公司 A kind of anode variable motion formula electroplanting device
CN111118560A (en) * 2019-12-16 2020-05-08 山西北方机械制造有限责任公司 Chromium plating method for driving plate
CN111962120A (en) * 2020-08-18 2020-11-20 重庆佰鸿机械设备有限公司 Pipe fitting inner wall surface treatment process
CN112442716A (en) * 2020-12-04 2021-03-05 四川华庆机械有限责任公司 Chromium plating method

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