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 PDF

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Publication number
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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China
Prior art keywords
magnesium alloy
chemical conversion
chrome
free chemical
conversion liquid
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Pending
Application number
CN201810464352.0A
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Chinese (zh)
Inventor
李玉胜
翟虎
刘闯
徐林林
张帅
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Shenyang Ming Teng Technology Co Ltd
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Shenyang Ming Teng Technology Co Ltd
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Priority to CN201810464352.0A priority Critical patent/CN108728839A/en
Publication of CN108728839A publication Critical patent/CN108728839A/en
Pending legal-status Critical Current

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    • CCHEMISTRY; METALLURGY
    • C23COATING 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
    • C23CCOATING 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
    • C23C22/00Chemical 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
    • C23C22/05Chemical 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
    • C23C22/06Chemical 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
    • C23C22/48Chemical 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
    • C23C22/57Treatment of magnesium or alloys based thereon

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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)
  • 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

A kind of Chrome-free chemical conversion liquid for magnesium alloy
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.
CN201810464352.0A 2018-05-15 2018-05-15 A kind of Chrome-free chemical conversion liquid for magnesium alloy Pending CN108728839A (en)

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

Publications (1)

Publication Number Publication Date
CN108728839A true CN108728839A (en) 2018-11-02

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CN (1) CN108728839A (en)

Citations (5)

* Cited by examiner, † Cited by third party
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

Patent Citations (5)

* Cited by examiner, † Cited by third party
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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