CN102453937A - Pretreatment method capable of improving corrosion resistance of magnesium and magnesium alloy - Google Patents
Pretreatment method capable of improving corrosion resistance of magnesium and magnesium alloy Download PDFInfo
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- CN102453937A CN102453937A CN2010105098050A CN201010509805A CN102453937A CN 102453937 A CN102453937 A CN 102453937A CN 2010105098050 A CN2010105098050 A CN 2010105098050A CN 201010509805 A CN201010509805 A CN 201010509805A CN 102453937 A CN102453937 A CN 102453937A
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Abstract
The invention provides a pretreatment method capable of improving the corrosion resistance of magnesium and a magnesium alloy. The method comprises the following steps of: (1) removing oil, namely dipping one of trichloroethylene, ethyl acetate, acetone and butanone by using absorbent cotton, wiping to remove oil stains, and wiping by using clean cotton cloth for 2 to 4 times; (2) etching, namely etching by using 130 to 150 weight parts of chromic anhydride, 30 to 45 weight parts of ferric nitrate nonahydrate and 3 to 5.5 weight parts of potassium fluoride at the temperature of between 18 and 25 DEG C for 0.5 to 2 minutes, and removing a natural oxidation film by using a composition B to prevent the film from reforming before electroplating; and (3) performing zinc galvanization, namely performing zinc galvanization by using 22 to 45 weight parts of zinc vitriol, 80 to 100 weight parts of sodium pyrophosphate decahydrate, 5 to 7.5 weight parts of sodium carbonate and 3 to 5 weight parts of lithium fluoride at the pH value of 10.2 to 10.4 and the temperature of between 80 and 85 DEG C for 3 to 10 minutes. By the method, the decorative performance, corrosion resistance, weldability, electrical conductivity and corrosion resistance of the magnesium and the magnesium alloy are improved, and a clad layer has higher adhesion force.
Description
Technical field
The present invention proposes a kind of pretreatment process that improves magnesium and magnesiumalloy corrosion stability.
Background technology
The plating pre-treatment occupies extremely important status with the plating aftertreatment in the metallic surface depositing process; The product of the surperficial coating technology manufacturing of many employings defective occurs often all by pre-treatment or aftertreatment is improper causes; The purpose that surface coarsening is handled is to improve coat binding strength, available mechanical process or chemical method alligatoring.Sensitization is handled and to be made the surface go up that adsorption layer is easy to the material (catalytic film) of oxidation and the reductive agent of catalytic metal ion during as next step activation.Immerses through water flushing back through the surface that sensitization is handled and to contain in the activation solution of catalytic metal ion, then catalytic metal ion just with sensitization after the absorption material that is easy to oxidation from the teeth outwards produce reaction and the formation metallic particles deposits from the teeth outwards.Reductive agent is put in surface after activated after water flushing, thereby makes the solution metal ion be reduced into metal and deposit and form a kind of metal conductive film from the teeth outwards, makes it to become electrical conductor, so that carry out brush plating.Carry out the plating pre-treatment and can improve that it is ornamental, corrosion stability, weldability, electroconductibility, wear resistance etc.
Summary of the invention
The present invention is proposed by the problems referred to above, and the present invention provides the pretreatment process that improves magnesium and magnesiumalloy corrosion stability, ornamental in order to after improving it and electroplating, corrosion stability, weldability, electroconductibility, wear resistance.
The present invention improves the pretreatment process of magnesium and magnesiumalloy corrosion stability, realizes that present method comprises the following steps:
(1) oil removing: bedew in trieline, vinyl acetic monomer, acetone, the butanone with absorbent cotton and to carry out wiping after a kind of, remove degreasing after, the cotton wiping with cleaning gets final product for 2-4 time again;
(2) etch: adopt the composition weight umber to be: chromic anhydride 130-150, nine nitric hydrate iron 30-45, Potassium monofluoride 3-5.5, temperature 18-25 ℃, 0.5-2min;
Compsn B removes natural sull and prevents before plating, to form once more;
(3) soak zinc: adopt the composition weight umber to be: Zinc vitriol 22-45, hydration trisodium phosphate 80-100, yellow soda ash 5-7.5, lithium fluoride 3-5,80-85 degree centigrade of time 3-10min of PH10.2-10.4 temperature;
Also will adopt the composition weight umber before in step (3) is 85% phosphatase 11 50-180, matt salt 53-78, temperature 16-30 degree centigrade of time 0.5-2.0min activation treatment.
Advantageous effect of the present invention is, the present invention improves the pretreatment process of magnesium and magnesiumalloy corrosion stability, ornamental in order to after improving it and electroplating, and corrosion stability, weldability, electroconductibility, wear resistance, the sticking power of coating is better.
Embodiment
Improve the pretreatment process of magnesium and magnesiumalloy corrosion stability, realize that present method comprises the following steps:
(1) oil removing: bedew in trieline, vinyl acetic monomer, acetone, the butanone with absorbent cotton and to carry out wiping after a kind of, remove degreasing after, the cotton wiping with cleaning gets final product for 2-4 time again;
(2) etch: adopt the composition weight umber to be: chromic anhydride 130-150, nine nitric hydrate iron 30-45, Potassium monofluoride 3-5.5, temperature 18-25 ℃, 0.5-2min;
Compsn B removes natural sull and prevents before plating, to form once more;
(3) soak zinc: adopt the composition weight umber to be: Zinc vitriol 22-45, hydration trisodium phosphate 80-100, yellow soda ash 5-7.5, lithium fluoride 3-5,80-85 degree centigrade of time 3-10min of PH10.2-10.4 temperature;
Also will adopt the composition weight umber before in step (3) is 85% phosphatase 11 50-180, matt salt 53-78, temperature 16-30 degree centigrade of time 0.5-2.0min activation treatment.
Claims (2)
1. improve the pretreatment process of magnesium and magnesiumalloy corrosion stability, realize that present method comprises the following steps:
(1) oil removing: bedew in trieline, vinyl acetic monomer, acetone, the butanone with absorbent cotton and to carry out wiping after a kind of, remove degreasing after, the cotton wiping with cleaning gets final product for 2-4 time again;
(2) etch: adopt the composition weight umber to be: chromic anhydride 130-150, nine nitric hydrate iron 30-45, Potassium monofluoride 3-5.5, temperature 18-25 ℃, 0.5-2min;
Compsn B removes natural sull and prevents before plating, to form once more;
(3) soak zinc: adopt the composition weight umber to be: Zinc vitriol 22-45, hydration trisodium phosphate 80-100, yellow soda ash 5-7.5, lithium fluoride 3-5,80-85 degree centigrade of time 3-10min of PH10.2-10.4 temperature;
2. the pretreatment process of raising magnesium according to claim 1 and magnesiumalloy corrosion stability; Also will adopt the composition weight umber before in step (3) is 85% phosphatase 11 50-180, matt salt 53-78, temperature 16-30 degree centigrade of time 0.5-2.0min activation treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105098050A CN102453937A (en) | 2010-10-18 | 2010-10-18 | Pretreatment method capable of improving corrosion resistance of magnesium and magnesium alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105098050A CN102453937A (en) | 2010-10-18 | 2010-10-18 | Pretreatment method capable of improving corrosion resistance of magnesium and magnesium alloy |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102453937A true CN102453937A (en) | 2012-05-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105098050A Pending CN102453937A (en) | 2010-10-18 | 2010-10-18 | Pretreatment method capable of improving corrosion resistance of magnesium and magnesium alloy |
Country Status (1)
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| CN (1) | CN102453937A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103898582A (en) * | 2013-06-03 | 2014-07-02 | 无锡市锡山区鹅湖镇荡口青荡金属制品厂 | Pretreatment solution for electroplating chromium on surface of magnesium alloy die casting |
| CN106521467A (en) * | 2015-09-15 | 2017-03-22 | 常州兰翔机械有限责任公司 | Engine case inner-surface anti-corrosion treatment method |
| CN108624877A (en) * | 2018-06-15 | 2018-10-09 | 莱诺斯科技（北京）股份有限公司 | A kind of magnesium lithium alloy material surface anti-corrosive treatment method |
-
2010
- 2010-10-18 CN CN2010105098050A patent/CN102453937A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103898582A (en) * | 2013-06-03 | 2014-07-02 | 无锡市锡山区鹅湖镇荡口青荡金属制品厂 | Pretreatment solution for electroplating chromium on surface of magnesium alloy die casting |
| CN106521467A (en) * | 2015-09-15 | 2017-03-22 | 常州兰翔机械有限责任公司 | Engine case inner-surface anti-corrosion treatment method |
| CN106521467B (en) * | 2015-09-15 | 2019-02-01 | 中国航发常州兰翔机械有限责任公司 | A kind of casing inner surface anti-corrosive treatment method |
| CN108624877A (en) * | 2018-06-15 | 2018-10-09 | 莱诺斯科技（北京）股份有限公司 | A kind of magnesium lithium alloy material surface anti-corrosive treatment method |
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Application publication date: 20120516 |