CN104561967A - Preparation process for chemical conversion coating on surface of magnesium alloy - Google Patents
Preparation process for chemical conversion coating on surface of magnesium alloy Download PDFInfo
- Publication number
- CN104561967A CN104561967A CN201410813391.9A CN201410813391A CN104561967A CN 104561967 A CN104561967 A CN 104561967A CN 201410813391 A CN201410813391 A CN 201410813391A CN 104561967 A CN104561967 A CN 104561967A
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- China
- Prior art keywords
- magnesium alloy
- chemical conversion
- solution
- conversion film
- alloy surface
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- 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
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/60—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using alkaline aqueous solutions with pH greater than 8
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- 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
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/68—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous solutions with pH between 6 and 8
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- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemically Coating (AREA)
- Chemical Treatment Of Metals (AREA)
Abstract
The invention relates to the field of surface treatment of metal, and particularly discloses a preparation process for a chemical conversion coating on the surface of a magnesium alloy. The preparation process comprises the following steps: (1), sample pretreatment; (2), preparation of a chemical plating solution; (3), preparation of a chemical coating; (4), inspection. The preparation process for the chemical conversion coating on the surface of the magnesium alloy is an optimal process obtained by multiple tests, and by the preparation process, the appearance quality, adhesion strength and corrosion resistance of the chemical conversion coating on the surface of the magnesium alloy is remarkably improved.
Description
Technical field
The present invention relates to metallic surface process field, specifically a kind of preparation technology of magnesium alloy surface chemical conversion film.
Background technology
Since mid-term in 20th century 90, along with rising steadily and raising that Sustainable development requires of energy prices, resources and environment has become the matter of utmost importance of human kind sustainable development, the research of Novel light alloy material more and more comes into one's own, magnesium alloy relies on its excellent performance to receive the concern of many domestic and international experts, but, magnesium alloy also there is erosion resistance simultaneously and adhesion strength is poor, inflammable, the shortcomings such as temperature-room type plasticity distortion difficulty, the application of magnesium alloy is limited by very large, therefore, effective its premium properties of protective treatment competence exertion need be carried out.At present, in order to improve the erosion resistance of magnesium alloy, usually need carry out surface modification treatment to it, mainly containing anodic oxidation, differential arc oxidation, electroless plating, chemical conversion, organic coating etc.; Wherein chemical conversion treatment is widely adopted so that its technique is simple, with low cost.
The subject matter that the preparation technology of the magnesium alloy surface chemical conversion film of prior art exists has (1) rete outward appearance, adhesion strength poor; Easily can wipe rete with absorbent cotton, (2) rete corrosion resistance is poor.These problems have become Mg alloy surface process bottleneck problem, must solve as early as possible.
Summary of the invention
In order to solve the deficiency of the preparation technology of the magnesium alloy surface chemical conversion film of above-mentioned prior art, the invention provides a kind of preparation technology of new magnesium alloy surface chemical conversion film, solve the shortcoming that adhesion strength is low, corrosion resistance is poor of magnesium alloy surface chemical conversion film.
Technical scheme of the present invention is as follows: a kind of preparation technology of magnesium alloy surface chemical conversion film, comprises the following steps:
(1) exemplar pre-treatment: the magnesium alloy exemplar choosing same size, its sand for surface wheel mechanical eliminates rust, and polishes flat; Upper extension, then use acetone degreasing; Clean up with distilled water, acid activation, and then washing is clean;
(2) chemical plating fluid preparation: add NaCr2O2HO solution, the MgSO7HO solution of 75g/l, the MnSO7HO solution of 75g/l that massfraction is 150g/l in a reservoir successively, mix, then regulate bath pH value to be 8.0 ~ 9.0;
(3) plated film preparation: magnesium alloy exemplar is immersed in above-mentioned plating solution and carries out plated film process, then washing, acid activation, washing; The air-dry dry magnesium alloy exemplar of reusable heat;
(4) check: hang under magnesium alloy exemplar, then carry out adhesion strength inspection successively to coatings, erosion resistance is checked.
The bath temperature of described step (3) remains on 85 ~ 100 DEG C, and plating time is 15 ~ 20min.
Described step (1) and step (3) acid activation are dilute sulphuric acid activation, and the volumetric concentration of sulfuric acid is 5% ~ 8%.
The volume ratio of described step (2) NaCr2O2HO solution, MgSO7HO solution, MnSO7HO solution is 2.5:1:1.
The adhesion strength inspection of described step (4) coatings adopts absorbent cotton wipe method; The erosion resistance inspection of coatings adopts volumetry.
The coatings of described Mg alloy surface is black.
Advantage of the present invention: the preparation technology of magnesium alloy surface chemical conversion film of the present invention is the optimised process obtained after test of many times, it significantly improves the visual appearance of magnesium alloy surface chemical conversion film, adhesion strength and corrosion resistance.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with specific embodiment, the present invention is further elaborated.
Embodiment one:
A preparation technology for magnesium alloy surface chemical conversion film, comprises the following steps:
(1) exemplar pre-treatment: the magnesium alloy exemplar choosing same size, its sand for surface wheel mechanical eliminates rust, and polishes flat; Upper extension, then use acetone degreasing; Clean up with distilled water, acid activation, and then washing is clean;
(2) chemical plating fluid preparation: add NaCr2O2HO solution, the MgSO7HO solution of 75g/l, the MnSO7HO solution of 75g/l that massfraction is 150g/l in a reservoir successively, mix, then regulate bath pH value to be 8.0;
(3) plated film preparation: magnesium alloy exemplar is immersed in above-mentioned plating solution and carries out plated film process, then washing, acid activation, washing; The air-dry dry magnesium alloy exemplar of reusable heat;
(4) check: hang under magnesium alloy exemplar, then carry out adhesion strength inspection successively to coatings, erosion resistance is checked.
The bath temperature of described step (3) remains on 90 DEG C, and plating time is 20min.
Described step (1) and step (3) acid activation are dilute sulphuric acid activation, and the volumetric concentration of sulfuric acid is 6%.
The volume ratio of described step (2) NaCr2O2HO solution, MgSO7HO solution, MnSO7HO solution is 2.5:1:1.
The adhesion strength inspection of described step (4) coatings adopts absorbent cotton wipe method; The erosion resistance inspection of coatings adopts volumetry.
The coatings of described Mg alloy surface is black.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. a preparation technology for magnesium alloy surface chemical conversion film, is characterized in that, comprises the following steps:
(1) exemplar pre-treatment: the magnesium alloy exemplar choosing same size, its sand for surface wheel mechanical eliminates rust, and polishes flat; Upper extension, then use acetone degreasing; Clean up with distilled water, acid activation, and then washing is clean;
(2) chemical plating fluid preparation: add NaCr2O2HO solution, the MgSO7HO solution of 75g/l, the MnSO7HO solution of 75g/l that massfraction is 150g/l in a reservoir successively, mix, then regulate bath pH value to be 8.0 ~ 9.0;
(3) plated film preparation: magnesium alloy exemplar is immersed in above-mentioned plating solution and carries out plated film process, then washing, acid activation, washing; The air-dry dry magnesium alloy exemplar of reusable heat;
(4) check: hang under magnesium alloy exemplar, then carry out adhesion strength inspection successively to coatings, erosion resistance is checked.
2. according to the preparation technology of a kind of magnesium alloy surface chemical conversion film described in claim 1, it is characterized in that, the bath temperature of described step (3) remains on 85 ~ 100 DEG C, and plating time is 15 ~ 20min.
3. according to the preparation technology of a kind of magnesium alloy surface chemical conversion film described in claim 1, it is characterized in that, described step (1) and step (3) acid activation are dilute sulphuric acid activation, and the volumetric concentration of sulfuric acid is 5% ~ 8%.
4. according to the preparation technology of a kind of magnesium alloy surface chemical conversion film described in claim 1, it is characterized in that, the volume ratio of described step (2) NaCr2O2HO solution, MgSO7HO solution, MnSO7HO solution is 2.5:1:1.
5. according to the preparation technology of a kind of magnesium alloy surface chemical conversion film described in claim 1, it is characterized in that, the adhesion strength inspection of described step (4) coatings adopts absorbent cotton wipe method; The erosion resistance inspection of coatings adopts volumetry.
6. according to the preparation technology of a kind of magnesium alloy surface chemical conversion film described in claim 1, it is characterized in that, the coatings of described Mg alloy surface is black.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410813391.9A CN104561967A (en) | 2014-12-24 | 2014-12-24 | Preparation process for chemical conversion coating on surface of magnesium alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410813391.9A CN104561967A (en) | 2014-12-24 | 2014-12-24 | Preparation process for chemical conversion coating on surface of magnesium alloy |
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| Publication Number | Publication Date |
|---|---|
| CN104561967A true CN104561967A (en) | 2015-04-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410813391.9A Pending CN104561967A (en) | 2014-12-24 | 2014-12-24 | Preparation process for chemical conversion coating on surface of magnesium alloy |
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| CN (1) | CN104561967A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105386027A (en) * | 2015-12-07 | 2016-03-09 | 浙江大学 | Preparation process for chemical conversion coating on surface of magnesium alloy |
| CN106987834A (en) * | 2016-01-21 | 2017-07-28 | 宝山钢铁股份有限公司 | A kind of film build method and chemical composition coating of magnesium-rare earth alloy chemical composition coating |
-
2014
- 2014-12-24 CN CN201410813391.9A patent/CN104561967A/en active Pending
Non-Patent Citations (1)
| Title |
|---|
| 薛寿昌: "镁合金黑色化学转化膜工艺", 《电镀与精饰》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105386027A (en) * | 2015-12-07 | 2016-03-09 | 浙江大学 | Preparation process for chemical conversion coating on surface of magnesium alloy |
| CN106987834A (en) * | 2016-01-21 | 2017-07-28 | 宝山钢铁股份有限公司 | A kind of film build method and chemical composition coating of magnesium-rare earth alloy chemical composition coating |
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Application publication date: 20150429 |