CN100535185C - Metal surface treatment technique for magnesium alloy - Google Patents
Metal surface treatment technique for magnesium alloy Download PDFInfo
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- CN100535185C CN100535185C CNB2006101223820A CN200610122382A CN100535185C CN 100535185 C CN100535185 C CN 100535185C CN B2006101223820 A CNB2006101223820 A CN B2006101223820A CN 200610122382 A CN200610122382 A CN 200610122382A CN 100535185 C CN100535185 C CN 100535185C
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Abstract
The invention provides a metallic surface treatment process for magnesium alloy, comprising steps such as pretreatment, passivation, coating and spraying formation, wherein, the external surface of magnesium alloy is formed into a pretreatment layer, a passivation layer and a protective layer in turn; while the non-external surface of a magnesium alloy workpiece is formed into a passivation layer and a spraying formation layer in turn. The treatment process is characterized by a simple formula, low cost and easy and convenient operation; moreover, the process not only improves the corrosion resistant capability of the magnesium alloy workpiece, but also protects the metallic character of the external surface of magnesium alloy formed through mechanical treatment.
Description
Technical field
The present invention relates to a kind of metal surface treatment process, particularly a kind of metal surface treatment technique for magnesium alloy.
Background technology
Magnesium alloy has very high specific tenacity, specific rigidity, than Young's modulus and good heat-conductivity conducting, have good damping shock absorption and electro-magnetic screen function simultaneously, be widely used in automobile making, aerospace, telecommunications field etc., be described as " the green engineering material of 21st century ".Yet because the chemically reactive of magnesium alloy itself is higher, in air, be easy to oxidation, very easily under various envrionment conditionss, corrode, thereby hindered the widespread use of magnesium alloy.
Mg alloy surface is carried out chemical modification, particularly Mg alloy surface is carried out chemical modification, be improve corrosion resistance of magnesium alloy can with one of effective way that improves its external coating sticking power.But traditional Mg alloy surface is carried out the method for chemical modification, corrosion is through the magnesium alloy outward appearance looks (as sandblast face, wire drawing face) of mechanical treatment, even application also is difficult to form metal effect more fully.
Summary of the invention
In view of the above problems, the object of the present invention is to provide a kind of metal surface treatment technique for magnesium alloy, this technological process is simple, can reach metal appearance and two aspects of protection against corrosion of having both magnesium alloy.
For achieving the above object, metal surface treatment technique for magnesium alloy provided by the invention, it mainly may further comprise the steps:
1) pre-treatment: the appearance of magnesium alloy workpiece is carried out mechanical polishing, polishing, degreasing degreasing, carry out surface sand-blasting, alkali cleaning, pickling then respectively;
2) passivation: utilize lithium salts system, tannic acid system or molybdate series that pretreated magnesium alloy workpiece is at room temperature carried out passivation;
3) application: adopt metal baking finish, PU lacquer or UV lacquer etc. to carry out application as the appearance of the magnesium alloy workpiece of protective paint after to passivation;
4) spray changes into: the non-appearance of the magnesium alloy workpiece after adopting zinc system, zinc-manganese system or organic acid to passivation sprays.
In the above-mentioned treatment process, in step 1), also be included in the step of carrying out ultrasonic cleaning after the sandblast, alkali cleaning, acid pickling step.
In the above-mentioned treatment process, step 2) can adopt concentration is that lithium nitrate or the Fluorinse of 1～10g/L carries out passivation, and the time of passivation is 30 minutes.
In the above-mentioned treatment process, in the application of step 3), adopt the amino bottoming of saturated polyester, its screening formulation is, in parts by weight, 50 parts of saturated polyester resins, 15 parts in aminoresin, 2 parts of Resins, epoxy, 2 parts of adhesion promoters, 6 parts in silver powder, 6 parts of N-BUTYL ACETATEs, the appearance of those components being mixed and being coated on by dilution in 1: 1 magnesium alloy workpiece, be cured for 180 ℃ with temperature then, be 15 minutes set time.
In the above-mentioned treatment process, during the step 4) spray changes into, can adopt concentration is the inferior zinc solution of di(2-ethylhexyl)phosphate of 50～100g/L, zinc nitrate solution that concentration is 5～15g/L, concentration is 1～10g/L Fluorinse or concentration is 60% phosphoric acid solution, non-appearance to magnesium alloy workpiece sprays, wherein, the pH value of those solution all need be adjusted to 3.5 for good.
Implement metal surface treatment technique for magnesium alloy provided by the invention; have fill a prescription simple, cost characteristics low, easy and simple to handle; after treatment; this magnesium alloy appearance is solidified with a protection enamelled coating on the sandblast face that pre-treatment forms; and the non-appearance of this magnesium alloy is formed with a spray and changes into layer; thus, both improved the resistance to corrosion of magnesium alloy workpiece, the metal speciality of having protected this magnesium alloy appearance to form again through mechanical treatment.
Description of drawings
Fig. 1 is the schema of metal surface treatment technique for magnesium alloy of the present invention.
Fig. 2 is the magnesium alloy surface structure synoptic diagram of an embodiment gained of technology of the present invention.
Embodiment
Below in conjunction with specific embodiment in detail the present invention is described in detail.
Embodiment 1
Magnesium alloy workpiece is handled as follows:
1) pre-treatment: the appearance of magnesium alloy workpiece 100 is carried out mechanical polishing, polishing, degreasing degreasing, carry out surface sand-blasting, ultrasonic cleaning, alkali cleaning, ultrasonic cleaning, pickling, ultrasonic cleaning processing then respectively;
2) passivation: utilizing concentration is that the lithium nitrate solution of 8g/L at room temperature carries out passivation to pretreated magnesium alloy workpiece 100, and the time of passivation is 30 minutes;
3) application: adopt the amino bottoming of saturated polyester, its screening formulation is, in parts by weight, 50 parts of saturated polyester resins, 15 parts in aminoresin, 2 parts of Resins, epoxy, 2 parts of adhesion promoters, 6 parts in silver powder, 6 parts of N-BUTYL ACETATEs, the appearance of those components being mixed and being coated on by dilution in 1: 1 magnesium alloy workpiece 100, be cured for 180 ℃ with temperature then, be 15 minutes set time;
4) spray changes into: employing concentration is that to be 3.5 zinc nitrate solution spray the non-appearance of magnesium alloy workpiece 100 for 10g/L, pH value.
Thus, as shown in Figure 2, processing through these four steps, be formed with a pretreatment layer 101, a passivation layer 102 and a protective layer 103 on the appearance of this magnesium alloy workpiece 100 successively, and be formed with successively on the non-appearance of this magnesium alloy workpiece 100 passivation layer 111 and one the spray change into the layer 112.
Embodiment 2
Magnesium alloy workpiece is handled as follows:
1) pre-treatment: the appearance of magnesium alloy workpiece 100 is carried out mechanical polishing, polishing, degreasing degreasing, carry out surface sand-blasting, ultrasonic cleaning, alkali cleaning, ultrasonic cleaning, pickling, ultrasonic cleaning processing then respectively;
2) passivation: utilizing concentration is that the Fluorinse of 7g/L at room temperature carries out passivation to pretreated magnesium alloy workpiece 100, and the time of passivation is 30 minutes;
3) application: adopt the amino bottoming of saturated polyester, its screening formulation is, in parts by weight, 50 parts of saturated polyester resins, 15 parts in aminoresin, 2 parts of Resins, epoxy, 2 parts of adhesion promoters, 6 parts in silver powder, 6 parts of N-BUTYL ACETATEs, the appearance of those components being mixed and being coated on by dilution in 1: 1 magnesium alloy workpiece 100, be cured for 180 ℃ with temperature then, be 15 minutes set time;
4) spray changes into: employing concentration is that to be 3.5 Fluorinse spray the non-appearance of magnesium alloy workpiece 100 for 10g/L, pH value.
Claims (5)
1. metal surface treatment technique for magnesium alloy, it may further comprise the steps:
1) pre-treatment: the appearance of magnesium alloy workpiece is carried out mechanical polishing, polishing, degreasing degreasing, carry out surface sand-blasting, alkali cleaning, pickling then respectively;
2) passivation: utilize lithium salts system, tannic acid system or molybdate series that pretreated magnesium alloy workpiece is at room temperature carried out passivation;
3) application: adopt metal baking finish, PU lacquer or UV lacquer to carry out application as the appearance of the magnesium alloy workpiece of protective paint after to passivation;
4) spray changes into: the non-appearance that adopts zinc system, zinc-manganese system to change into liquid or the organic acid soln magnesium alloy workpiece after to passivation sprays.
2. metal surface treatment technique for magnesium alloy as claimed in claim 1 is characterized in that, also is included in the step of carrying out ultrasonic cleaning after the sandblast, alkali cleaning, acid pickling step in the step 1) preprocessing process.
3. metal surface treatment technique for magnesium alloy as claimed in claim 1 is characterized in that step 2) can to adopt concentration in the passivating process be that lithium nitrate or the Fluorinse of 1～10g/L carries out passivation, the time of passivation is 30 minutes.
4. metal surface treatment technique for magnesium alloy as claimed in claim 1, it is characterized in that, in the step 3) coating process, adopt the amino bottoming of saturated polyester, the amino prescription of this saturated polyester is, in parts by weight, 50 parts of saturated polyester resins, 15 parts in aminoresin, 2 parts of Resins, epoxy, 2 parts of adhesion promoters, 6 parts in silver powder, 6 parts of N-BUTYL ACETATEs, the appearance of those components being mixed and being coated on by dilution in 1: 1 magnesium alloy workpiece, be cured for 180 ℃ with temperature then, be 15 minutes set time.
5. metal surface treatment technique for magnesium alloy as claimed in claim 1, it is characterized in that, in the step 4) spray formation process, adopting concentration is the inferior zinc solution of di(2-ethylhexyl)phosphate of 50～100g/L, zinc nitrate solution that concentration is 5～15g/L, concentration is 1～10g/L Fluorinse or concentration is 60% phosphoric acid solution, non-appearance to magnesium alloy workpiece sprays, wherein, the pH value of those solution is 3.5.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2006101223820A CN100535185C (en) | 2006-09-25 | 2006-09-25 | Metal surface treatment technique for magnesium alloy |
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| CNB2006101223820A CN100535185C (en) | 2006-09-25 | 2006-09-25 | Metal surface treatment technique for magnesium alloy |
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| CN100535185C true CN100535185C (en) | 2009-09-02 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101758009B (en) * | 2008-12-24 | 2012-05-30 | 上海富臣化工有限公司 | Surface construction method for ultraviolet light cured paint metal skin |
| US9011977B2 (en) * | 2009-09-11 | 2015-04-21 | GM Global Technology Operations LLC | Corrosion inhibitors in breakable microcapsules to passivate scratched metals |
| CN101934265A (en) * | 2010-08-04 | 2011-01-05 | 六和轻合金（昆山）有限公司 | Coating method of aluminum alloy wheel rim |
| CN105772378A (en) * | 2016-04-20 | 2016-07-20 | 青岛金龙恒丰电子科技有限公司 | Metal surface coating method |
| CN106433416B (en) * | 2016-10-13 | 2022-06-28 | 广州立邦涂料有限公司 | High-temperature-resistant primer and preparation method and application thereof |
| CN106733546A (en) * | 2016-12-14 | 2017-05-31 | 刘兴旺 | A kind of method of the corrosion-resistant surface treatment of magnadure casting |
| CN107262426A (en) * | 2017-06-12 | 2017-10-20 | 芜湖天航科技（集团）股份有限公司 | Metallic plate processing method |
| CN110253445A (en) * | 2019-06-27 | 2019-09-20 | 爱克斯瑞真空技术（苏州）有限公司 | A kind of metal surface sand blasting process applied to anode assemblies |
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Non-Patent Citations (2)
| Title |
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| 简论金属的表面被覆－－涂料涂装. 张雪敏.河南教育学院学报（自然科学版），第12卷第2期. 2003 |
| 简论金属的表面被覆－－涂料涂装. 张雪敏.河南教育学院学报（自然科学版），第12卷第2期. 2003 * |
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