CN108728839A - A kind of Chrome-free chemical conversion liquid for magnesium alloy - Google Patents
A kind of Chrome-free chemical conversion liquid for magnesium alloy Download PDFInfo
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- CN108728839A CN108728839A CN201810464352.0A CN201810464352A CN108728839A CN 108728839 A CN108728839 A CN 108728839A CN 201810464352 A CN201810464352 A CN 201810464352A CN 108728839 A CN108728839 A CN 108728839A
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- magnesium alloy
- chemical conversion
- chrome
- free chemical
- conversion liquid
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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
- C23C22/06—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 acidic solutions with pH less than 6
- C23C22/48—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 acidic solutions with pH less than 6 not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates
- C23C22/57—Treatment of magnesium or alloys based thereon
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- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
Abstract
A kind of Chrome-free chemical conversion liquid for magnesium alloy, wherein 5~25 g/L of potassium permanganate concentration, 2~10 g/L of chlorination cerium concentration, 15~25 g/L of sodium chloride concentration；After Chrome-free chemical conversion liquid for magnesium alloy of the present invention processing, magnesium alloy sample is anti-corrosion, and the time is more than 150 seconds, and neutral salt spray test is more than 96 hours, has good corrosion resistance, and coating has good adhesive force.Chrome-free chemical conversion liquid for magnesium alloy of the present invention not only improves working environment, also reduces environmental pollution, while reducing production cost, can be widely applied to the surface treatment of magnesium alloy product.
Description
Technical field
The present invention relates to magnesium alloy surface treatment, more particularly to a kind of Chrome-free chemical conversion liquid for magnesium alloy.
Background technology
Magnesium alloy is structural metallic materials most light in current commercial Application, have density is small, specific strength and specific stiffness are high,
Electromagnetic shielding and damping property is good, dimensionally stable, forming easy to process and the advantages that be easy recycling, be widely used to aviation boat
It, the fields such as automobile, electronics, weaponry.But since the chemism of magnesium is higher, lead to its product inoxidizability, corrosion-resistant
Property is poor, greatly limits its application.
Solve the problems, such as that magnesium alloy is anti-oxidant, corrosion resistant generally from control impurity content, preparation high purity alloys and surface
Reason etc. is started with, and chemical conversion treatment is easy to operate, low-cost method in Mg alloy surface processing.Magnesium alloy is through changing
After learning conversion processing, matrix surface forms one layer of conversion film, to prevent erosion of the Korrosionsmedium to magnesium alloy substrate.
Traditional chemical conversion technology is chromate chemical conversion, and the chemical composition coating of formation has self-repairability, corrosion resistance
It is very high.But due to the Cr VI containing high pollution in conversion film, chromate chemical conversion processing is banned in many countries
Only.
Invention content
The object of the present invention is to provide a kind of Chrome-free chemical conversion liquid for magnesium alloy, existing to solve using chromium-free component
There is the problem of pollution of hexa covalent chromium ion environment in chemical conversion solution.
Technical scheme is as follows:5~25 g/L of concentration of potassium permanganate, chlorine in Chrome-free chemical conversion liquid for magnesium alloy
Change 2~10 g/L of concentration, 15~25 g/L of concentration of sodium chloride of cerium.
The pH value of above-mentioned Chrome-free chemical conversion liquid for magnesium alloy is 3.0~4.0.
The preparation method of above-mentioned Chrome-free chemical conversion liquid for magnesium alloy is：By potassium permanganate, cerium chloride and sodium chloride by molten
Yu Shuizhong, stirring to all solids are dissolved.
Above-mentioned wet concentration deionized water.
The method that above-mentioned Chrome-free chemical conversion liquid for magnesium alloy carries out chemical conversion, includes the following steps：
（1）Magnesium alloy sample is polishing to surface-brightening；
（2）Magnesium alloy sample after polishing is cleaned with acetone and is degreased, then washing removal acetone, then alkali cleaning removes alkali soluble
Property impurity, last secondary water are washed away except lye；
（3）Magnesium alloy sample after secondary washing is immersed in Chrome-free chemical conversion liquid for magnesium alloy and carries out chemical conversion treatment, when
Between at least 30min, then washing removal Chrome-free chemical conversion liquid for magnesium alloy, re-dry removes moisture removal, completes Mg alloy surface
Chemical conversion.
Magnesium alloy is surface-treated using chromium-free chemical conversion of the present invention, to magnesium alloy sample after treatment
Pitting test is carried out, the anti-corrosion time is more than 150 seconds；Neutral salt spray test is carried out, passed 96 hours, it is very good to show
Corrosion resisting property.And after spray painting, enamelled coating has good adhesive force.
The present invention provides a kind of Chrome-free, high anti-corrosion, high adhesion force magnesium alloy chemical conversion fluids, using it to magnesium alloy
Product carries out chemical conversion treatment, not only increases membranous layer corrosion resistance and adhesive force, and improve working environment, reduces ring
Border is polluted, while reducing production cost.The conversion film obtained after chromium-free chemical conversion of the present invention processing is not only anti-corrosion
Property it is high and also relatively strong with the adhesive force of organic coating, the surface treatment of magnesium alloy product can be widely used in safely.
Specific implementation mode
Pitting test is carried out by QJ 468-1985 in the embodiment of the present invention.
Neutral salt spray test is carried out by GB/T 10125-2012 in the embodiment of the present invention.
Carried out in the embodiment of the present invention lye ingredient that uses of alkali cleaning for：10~25g/L of caustic soda concentration, phosphoric acid na concn
40~60g/L, 20~30g/L of concentration of sodium silicate, 70~90 DEG C of the temperature that alkali cleaning is, 10~30min of time.
Embodiment 1
Take 5g potassium permanganate, 4g cerium chlorides, 15g sodium chloride to be added in 1L distilled water, stirring and dissolving uniformly obtain magnesium alloy without
Chromium chemical conversion solution；
Sample after polishing, acetone cleaning, washing, alkali cleaning, washing, carry out 30min chemical conversion treatments, then carry out washing and
It is dry；Sample 1 is obtained, does pitting test and neutral salt spray test respectively to it, the 1 anti-corrosion time of sample is 189 seconds, stain occurs
Time be 102 hours.
Embodiment 2
15g potassium permanganate, 6g cerium chlorides, 20g sodium chloride is taken to be added in 1L distilled water, stirring and dissolving uniformly obtains magnesium alloy
Chromium-free chemical conversion；
Sample after polishing, acetone cleaning, washing, alkali cleaning, washing, carry out 30min chemical conversion treatments, then carry out washing and
It is dry；Sample 2 is obtained, does pitting test and neutral salt spray test respectively to it, the 2 anti-corrosion time of sample is 204 seconds, stain occurs
Time be 110 hours.
Embodiment 3
25g potassium permanganate, 8g cerium chlorides, 25g sodium chloride is taken to be added in 1L distilled water, stirring and dissolving uniformly obtains magnesium alloy
Chromium-free chemical conversion；
Sample after polishing, acetone cleaning, washing, alkali cleaning, washing, carry out 30min chemical conversion treatments, then carry out washing and
It is dry；Sample 3 is obtained, does pitting test and neutral salt spray test respectively to it, the 3 anti-corrosion time of sample is 175 seconds, stain occurs
Time be 98 hours.
The present invention is not limited to the above embodiments, and all technical solutions formed using equivalent replacement or equivalence replacement belong to this
The claimed range of invention.Except the various embodiments described above, embodiment of the present invention is also very much, all using equivalent or equivalent replace
The technical solution changed, within protection scope of the present invention.
Claims (3)
1. a kind of Chrome-free chemical conversion liquid for magnesium alloy, it is characterised in that：5~25 g/L of concentration of potassium permanganate, cerium chloride it is dense
Spend 2~10 g/L, 15~25 g/L of concentration of sodium chloride.
2. a kind of preparation method of Chrome-free chemical conversion liquid for magnesium alloy as described in claim 1, it is characterised in that：By permanganic acid
Potassium, cerium chloride and sodium chloride are by soluble in water, stirring to all solids dissolving.
3. a kind of method as carried out chemical conversion using Chrome-free chemical conversion liquid for magnesium alloy described in claim 1, feature
It is：Include the following steps：
（1）Magnesium alloy sample is polishing to surface-brightening；
（2）Magnesium alloy sample after polishing is cleaned with acetone and is degreased, then washing removal acetone, then alkali cleaning removes alkali soluble
Property impurity, last secondary water are washed away except lye；
（3）Magnesium alloy sample after secondary washing is immersed in Chrome-free chemical conversion liquid for magnesium alloy and carries out chemical conversion treatment, when
Between at least 30min, then washing removal Chrome-free chemical conversion liquid for magnesium alloy, re-dry removes moisture removal, completes Mg alloy surface
Chemical conversion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810464352.0A CN108728839A (en) | 2018-05-15 | 2018-05-15 | A kind of Chrome-free chemical conversion liquid for magnesium alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810464352.0A CN108728839A (en) | 2018-05-15 | 2018-05-15 | A kind of Chrome-free chemical conversion liquid for magnesium alloy |
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| CN108728839A true CN108728839A (en) | 2018-11-02 |
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| CN201810464352.0A Pending CN108728839A (en) | 2018-05-15 | 2018-05-15 | A kind of Chrome-free chemical conversion liquid for magnesium alloy |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002097164A2 (en) * | 2001-05-31 | 2002-12-05 | Universite Pierre Et Marie Curie | Composition and method for treating magnesium alloys |
| CN101113518A (en) * | 2006-07-28 | 2008-01-30 | 佛山市顺德区汉达精密电子科技有限公司 | Magnesium alloy surface rare earth treatment technique |
| CN101225517A (en) * | 2008-02-22 | 2008-07-23 | 陈东初 | Non-chromium treatment fluid for preparation of corrosion-resistant oxidation film on magnesium alloy surface and method of use thereof |
| CN105734550A (en) * | 2014-12-11 | 2016-07-06 | 朱绒霞 | Preparation method for magnesium alloy rare earth conversion coating |
| CN106756931A (en) * | 2016-12-26 | 2017-05-31 | 巢湖云海镁业有限公司 | A kind of modified copper nano-wire rare-earth salts conversion fluid and its application method for Mg alloy surface treatment |
-
2018
- 2018-05-15 CN CN201810464352.0A patent/CN108728839A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002097164A2 (en) * | 2001-05-31 | 2002-12-05 | Universite Pierre Et Marie Curie | Composition and method for treating magnesium alloys |
| CN101113518A (en) * | 2006-07-28 | 2008-01-30 | 佛山市顺德区汉达精密电子科技有限公司 | Magnesium alloy surface rare earth treatment technique |
| CN101225517A (en) * | 2008-02-22 | 2008-07-23 | 陈东初 | Non-chromium treatment fluid for preparation of corrosion-resistant oxidation film on magnesium alloy surface and method of use thereof |
| CN105734550A (en) * | 2014-12-11 | 2016-07-06 | 朱绒霞 | Preparation method for magnesium alloy rare earth conversion coating |
| CN106756931A (en) * | 2016-12-26 | 2017-05-31 | 巢湖云海镁业有限公司 | A kind of modified copper nano-wire rare-earth salts conversion fluid and its application method for Mg alloy surface treatment |
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