CN106906496A - A kind of method for preparing trivalent chromium plating coating in steel surface - Google Patents
A kind of method for preparing trivalent chromium plating coating in steel surface Download PDFInfo
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- CN106906496A CN106906496A CN201710184752.1A CN201710184752A CN106906496A CN 106906496 A CN106906496 A CN 106906496A CN 201710184752 A CN201710184752 A CN 201710184752A CN 106906496 A CN106906496 A CN 106906496A
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- Prior art keywords
- coating
- plating
- trivalent chromium
- acid
- chromium plating
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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
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/04—Electroplating: Baths therefor from solutions of chromium
- C25D3/06—Electroplating: Baths therefor from solutions of chromium from solutions of trivalent chromium
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
- C23C18/31—Coating with metals
- C23C18/32—Coating with nickel, cobalt or mixtures thereof with phosphorus or boron
- C23C18/34—Coating with nickel, cobalt or mixtures thereof with phosphorus or boron using reducing agents
- C23C18/36—Coating with nickel, cobalt or mixtures thereof with phosphorus or boron using reducing agents using hypophosphites
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
- C23C28/021—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material including at least one metal alloy layer
-
- 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
- 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
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/48—After-treatment of electroplated surfaces
- C25D5/50—After-treatment of electroplated surfaces by heat-treatment
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electrochemistry (AREA)
- Mechanical Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Electroplating And Plating Baths Therefor (AREA)
Abstract
The present invention relates to a kind of method for preparing trivalent chromium plating coating in steel surface, belong to field of metal surface treatment technology.Carried out using following steps：One layer of phosphorus nickel is deposited in steel surface（NiP）Coating；Again chrome coating is electroplated with the method for trivalent chromium plating on phosphorus nickel coating；Above-mentioned plating chrome coating is heat-treated, the temperature of heat treatment is 600 DEG C 1000 DEG C, and then the 2h of soaking time 0.5 cools to room temperature with the furnace.The present invention provide the method in steel surface trivalent chromium plating, the coating Taber indexes of preparation 0.5 4,（The trivalent chromium plating coating index for obtaining in the prior art is general more than 15）Overcome in current trivalent chromium plating method due to caused by coating and base material adhesion difference cladding wearability it is poor, it is easy to fall off the problems such as.
Description
Technical field
The present invention relates to a kind of method for preparing trivalent chromium plating coating in steel surface, category metal surface treatment technology neck
Domain.
Background technology
Chromium electroplated coating is due to high rigidity, excellent anti-wear performance, corrosion resistance and decorative surface, therefore electrodeposited chromium
It is widely used in steel surface treatment, to improve corrosion resistance, wearability, case hardness and the dicoration of steel substrate.Industry
The electrodeposited chromium of upper steel surface is substantially all using hexavalent chromium plating technology, but Cr VI toxicity is big, and environmental pollution is serious, and six
The waste liquid of valency chromium plating is difficult to process, and the developed country such as America and Europe has made strict regulation to the discharge capacity of Cr VI.Due to these
Reason, promotes people to seek the alternative of hexavalent chromium plating.Research finds that trivalent chromium plating is to substitute hexavalent chromium plating most to have
A kind of desired method, trivalent chromium toxicity is more much lower than Cr VI, and its electroplating effluent is more disposable.But trivalent chromium plating, due to
Polarization phenomena are there are in electroplating process, makes thickness of coating be difficult to increase, in coating and steel substrate adhesion difference and coating
There is internal stress so that the wearability of coating, corrosion resistance are poor, there is presently no the plating for being applied to industrial plating piece, be only limitted to
Ornamental electrodeposited chromium.The invention provides before and after a kind of trivalent chromium plating and surface treatment method, can be improved using the method
Trivalent chromium plating coating and the adhesion of base material, strengthen the wearability and corrosion resistance of coating.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of method for preparing trivalent chromium plating coating in steel surface.
It overcome in current trivalent chromium plating method due to caused by coating and base material adhesion difference cladding wearability it is poor, easy to fall off etc.
Problem.
The method of the present invention is carried out using following steps：
1）One layer of phosphorus nickel is deposited in steel surface（NiP）Coating；
2）Again chrome coating is electroplated with the method for trivalent chromium plating on phosphorus nickel coating；
3）Above-mentioned plating chrome coating is heat-treated, the temperature of heat treatment is 600 DEG C -1000 DEG C, soaking time 0.5-2h, so
After cool to room temperature with the furnace.
Step 3）In, preferably 700 DEG C -900 DEG C of heat treatment temperature.
Preparing for NiP coatings can be entered using chemical deposition or the chemical deposition method combined with electronickelling in step 1
OK, reducing agent used during chemical deposition is hypophosphites, such as sodium hypophosphite.Phosphorus content in NiP coatings（Mass percent）
Control is in 3-15%, preferably 5-9%；Thickness 2-20um, preferably 4-15um.It is nickel source that electronickelling uses nickel sulfamic acid.
The NiP coatings of chemical deposition electronickelling or plating trivalent chromium before, first by NiP coatings strong acid acid etching 1-10s, institute
Strong acid is hydrochloric acid, nitric acid, sulfuric acid, preferably hydrochloric acid, and the concentration of acid is 10-30wt%, and the plating piece after acid etching is heated to 200-
400 DEG C, 10-60min is incubated, be then immersed in the water of room temperature, time 5-30s.
Walk poly- 2）It is chromium source that middle electrodeposited chromium uses chromium sulfate, current density 20A/dm during plating2, the pH of electrodeposit liquid is 2.0.
The abrasion performance of coating prepared by the present invention is measured with Taber abrasiometers.Abrasion performance is characterized with Taber indexes
Performance, Taber indexes are smaller, and abrasion performance is better.Experiment parameter is：Abrasive material：Taber5135 abrasive materials, emery wheel：CS10,
Rotating speed 72rpm, load 1000g, cycle-index；6000.
The present invention provide the method in steel surface trivalent chromium plating, the coating Taber indexes of preparation in 0.5-4,（It is existing
There is the trivalent chromium plating coating index obtained in technology general more than 15）Overcome in current trivalent chromium plating method due to plating
Layer with base material adhesion difference caused by cladding wearability it is poor, it is easy to fall off the problems such as.
Specific embodiment
Embodiment 1
It is nickel source to use nickel sulfate, and sodium hypophosphite is reducing agent, and 2um thickness is deposited on steel substrate, and phosphorus content is controlled 3%
NiP coatings, by the coating HCl treatment 1s of 30wt%, running water is rinsed, then thereon with the method for trivalent chromium plating
Plating.Airing is cleaned after the completion of plating, is put into 600 DEG C of Muffle furnace and is incubated 1h, then cool to room temperature with the furnace.Coating
Taber indexes are 4.
Embodiment 2
It is nickel source to use nickel sulfate, and sodium hypophosphite is reducing agent, and 5um thickness is deposited on steel substrate, and phosphorus content is controlled in quality
NiP coatings than 6%, by the coating with 20% HCl treatment 5s, running water rinses, then thereon with trivalent chromium plating
Method is electroplated.Airing is cleaned after the completion of plating, is put into 800 DEG C of Muffle furnace and is incubated 1h, then cool to room temperature with the furnace.Plating
The Taber indexes of layer are 2.
Embodiment 3
It is nickel source to use nickel sulfate, and sodium hypophosphite is reducing agent, and 2um thickness is deposited on steel substrate, and phosphorus content is controlled 6%
NiP coatings, by the coating with 10% HCl treatment 10s, running water rinse, then thereon electroplate a layer thickness 2um nickel dams.
Nickel source, current density 2A/dm are made with nickel sulfamic acid during electronickelling2, electroplate liquid pH is 2.0, and airing is cleaned after the completion of electronickelling
, it is put into Muffle furnace and is heated to 200 DEG C, 30min is incubated, 10s in immersion running water at room temperature is taken out, then thereon with three
Valency chromium electric plating method electrodeposited chromium layers.The plating piece of completion is put into 1.5h is incubated in 800 DEG C of Muffle furnace, then furnace cooling
To room temperature.The Taber indexes of coating are 1.
Embodiment 4
It is nickel source to use nickel sulfate, and sodium hypophosphite is reducing agent, and 5um thickness is deposited on steel substrate, and phosphorus content is controlled 10%
NiP coatings, by the coating with 30% nitric acid treatment 10s, running water rinse, then thereon electroplate a layer thickness 5um nickel dams.
Nickel source, current density 4A/dm are made with nickel sulfamic acid during electronickelling-2, electroplate liquid pH is 2.0, and airing is cleaned after the completion of electronickelling
, it is put into Muffle furnace and is heated to 400 DEG C, 10min is incubated, 5s in immersion running water at room temperature is taken out, then thereon with three
Valency chromium electric plating method electrodeposited chromium layers.The plating piece of completion is put into 0.5h is incubated in 1000 DEG C of Muffle furnace, then furnace cooling
To room temperature.The Taber indexes of coating are 2.
Embodiment 5
It is nickel source to use nickel sulfate, and sodium hypophosphite is reducing agent, and 10um thickness is deposited on steel substrate, and phosphorus content is controlled 15%
NiP coatings, by the coating with 30% sulfuric acid treatment 1s, running water rinse, then thereon electroplate a layer thickness 10um nickel
Layer.Nickel source, current density 4A/dm are made with nickel sulfamic acid during electronickelling-2, electroplate liquid pH is 2.0, is cleaned after the completion of electronickelling cool
It is dry, it is put into Muffle furnace and is heated to 300 DEG C, 60min is incubated, 20s in immersion running water at room temperature is taken out, then thereon
With the method electrodeposited chromium layers of trivalent chromium plating.The plating piece of completion is put into 1000 DEG C of Muffle furnace and is incubated 2h, it is then cold with stove
But to room temperature.The Taber indexes of coating are 2.5.
Embodiment 6
It is nickel source to use nickel sulfate, and sodium hypophosphite is reducing agent, and 10um thickness is deposited on steel substrate, and phosphorus content is controlled 15%
NiP coatings, by the coating with 30% HCl treatment 1s, running water rinse, then thereon electroplate a layer thickness 5um nickel
Layer.Nickel source, current density 2A/dm are made with nickel sulfamic acid during electronickelling-2, electroplate liquid pH is 2.0, is cleaned after the completion of electronickelling cool
It is dry, it is put into Muffle furnace and is heated to 300 DEG C, 300min is incubated, 30s in immersion running water at room temperature is taken out, then thereon
With the method electrodeposited chromium layers of trivalent chromium plating.The plating piece of completion is put into 900 DEG C of Muffle furnace and is incubated 2h, it is then cold with stove
But to room temperature.The Taber indexes of coating are 0.5.
Claims (7)
1. a kind of method for preparing trivalent chromium plating coating in steel surface, it is characterised in that carried out using following steps：
1) one layer of phosphorus nickel coating is deposited in steel surface；
2) chrome coating is electroplated on phosphorus nickel coating with the method for trivalent chromium plating again；
3) above-mentioned plating chrome coating is heat-treated, the temperature of heat treatment is 600 DEG C -1000 DEG C, soaking time 0.5-2h, so
After cool to room temperature with the furnace.
2. method according to claim 1, it is characterised in that step 1) in NiP coatings preparation using chemical deposition or
The chemical deposition method combined with electronickelling is carried out.
3. method according to claim 2, it is characterised in that reducing agent used is hypophosphites, electricity during chemical deposition
It is nickel source that nickel plating uses nickel sulfamic acid.
4. the method according to claim 1,2 or 3, it is characterised in that the control of phosphorus mass percentage content exists in NiP coatings
3-15%, NiP coating layer thickness 2-20um.
5. method according to claim 1, it is characterised in that the NiP coatings of chemical deposition are in electronickelling or plating trivalent
Before chromium, first by NiP coatings strong acid acid etching 1-10s, the plating piece after acid etching is heated to 200-400 DEG C, is incubated 10-60min, then
Immerse in the water of room temperature, time 5-30s.
6. method according to claim 5, it is characterised in that strong acid used is hydrochloric acid, nitric acid, sulfuric acid, preferably hydrochloric acid,
The concentration of acid is 10-30wt%.
7. method according to claim 1, it is characterised in that step it is poly- 2) in electrodeposited chromium use chromium sulfate be chromium source, electroplate
When current density 20A/dm2, the pH of electrodeposit liquid is 2.0.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710184752.1A CN106906496A (en) | 2017-03-24 | 2017-03-24 | A kind of method for preparing trivalent chromium plating coating in steel surface |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710184752.1A CN106906496A (en) | 2017-03-24 | 2017-03-24 | A kind of method for preparing trivalent chromium plating coating in steel surface |
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| CN201710184752.1A Pending CN106906496A (en) | 2017-03-24 | 2017-03-24 | A kind of method for preparing trivalent chromium plating coating in steel surface |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111705345A (en) * | 2020-06-04 | 2020-09-25 | 东华大学 | Composite preparation process of coating suitable for grooved needle |
| CN111926351A (en) * | 2020-08-07 | 2020-11-13 | 浙江集工阀门有限公司 | Composite plating process for ball valve |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104995339A (en) * | 2013-01-15 | 2015-10-21 | 萨夫罗克有限公司 | Method for producing a chromium coating on a metal substrate |
| WO2016005651A1 (en) * | 2014-07-11 | 2016-01-14 | Savroc Ltd | A chromium-containing coating, a method for its production and a coated object |
| CN105917029A (en) * | 2014-01-15 | 2016-08-31 | 萨夫罗克有限公司 | Method for producing a chromium coating and a coated object |
| CN105917030A (en) * | 2014-01-15 | 2016-08-31 | 萨夫罗克有限公司 | Method for producing chromium-containing multilayer coating and a coated object |
-
2017
- 2017-03-24 CN CN201710184752.1A patent/CN106906496A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104995339A (en) * | 2013-01-15 | 2015-10-21 | 萨夫罗克有限公司 | Method for producing a chromium coating on a metal substrate |
| CN105917029A (en) * | 2014-01-15 | 2016-08-31 | 萨夫罗克有限公司 | Method for producing a chromium coating and a coated object |
| CN105917030A (en) * | 2014-01-15 | 2016-08-31 | 萨夫罗克有限公司 | Method for producing chromium-containing multilayer coating and a coated object |
| WO2016005651A1 (en) * | 2014-07-11 | 2016-01-14 | Savroc Ltd | A chromium-containing coating, a method for its production and a coated object |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111705345A (en) * | 2020-06-04 | 2020-09-25 | 东华大学 | Composite preparation process of coating suitable for grooved needle |
| CN111705345B (en) * | 2020-06-04 | 2021-12-21 | 东华大学 | Composite preparation process of coating suitable for grooved needle |
| CN111926351A (en) * | 2020-08-07 | 2020-11-13 | 浙江集工阀门有限公司 | Composite plating process for ball valve |
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Address after: 436070 Gedian Economic and Technological Development Zone, Wuhan City, Hubei Province Applicant after: WUHAN DESYTEK ENVIRONMENTAL PROTECTION NEW MATERIAL CO., LTD. Address before: 436070 Gedian Economic and Technological Development Zone, Wuhan City, Hubei Province Applicant before: WUHAN DESYTEK ENVIRONMENTAL PROTECTION NEW MATERIAL CO., LTD. |
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