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Organic and inorganic composite magnesium alloy non-chromium passivation treatment fluid

An inorganic composite, chromium-free passivation technology, applied in the field of metal material surface treatment and passivation treatment liquid, can solve the problems of short corrosion resistance durability and weakened organic matter, and achieve the effect of excellent corrosion resistance

Inactive Publication Date: 2009-10-28
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, potassium permanganate has many disadvantages: first, its crystals and high-concentration solutions cannot directly contact the skin because of its strong corrosiveness; second, when used for water purification, although its bactericidal power is extremely strong, it is extremely It is easily weakened by organic matter, so the durability of corrosion resistance is slightly shorter

Method used

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  • Organic and inorganic composite magnesium alloy non-chromium passivation treatment fluid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The main components of the organic and inorganic composite passivation solution with ferrate as the main inorganic salt are:

[0022] Potassium ferrate 0.7g

[0023] Water-based silicone 25g

[0024] Waterborne Polyurethane 150g

[0025] Potassium periodate 10g

[0026] Deionized water 814.3g

[0027] The substrate used is magnesium alloy. The treatment process of the coating is pH 10, dip coating at room temperature, and drying at 150°C for 5 minutes.

[0028] The comparative example is a magnesium alloy blank substrate and a sample treated with a passivation solution from a certain company on the market.

[0029] figure 1 Polarization curves of various passivating solutions. Depend on figure 1 It can be seen that the corrosion resistance of the present invention is significantly improved compared with the blank sample, and is better than the result of a certain company's passivation solution treatment.

[0030] The neutral salt spray test of the passivation f...

Embodiment 2

[0032] Potassium ferrate 1g

[0033] Water-based silicone 44g

[0034] Waterborne Polyurethane 150g

[0035] Potassium periodate 4g

[0036] m-Phenylenediamine 3g

[0037] Deionized water 798g

[0038] The substrate used is magnesium alloy. The coating process is as follows: the pH value is 10, dip-coating at room temperature, and drying at 100° C. for 5 minutes.

[0039] The neutral salt spray test of the passivation film can reach 72 hours, and the adhesion can reach level 1.

[0040] In a word, the experimental results show that the passivation solution of the present invention can be used to obtain a passivation film with excellent adhesion on the metal surface. The performance of the passivation film is equivalent to the passivation effect of chromate, and even exceeds The corrosion resistance of the film, so it can completely replace chromate and realize an environmentally friendly passivation film. Compared with the prior art, the present invention has the follow...

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Abstract

The invention discloses an organic and inorganic composite magnesium alloy non-chromium passivation treatment fluid, pertains to the field of metal materials, and relates to a problem of treatment of metal material surface, and in particular to a passivation treatment fluid which can improve the corrosion resistance of the magnesium alloy surface and does not contain hexavalent chromium. In the method, within the pH value range of 8-10, organic resins such as 10 to 25 percent of waterborne acrylic resin, polyurethane, organic silicon and the like are adopted as a film forming agent; 0.01 to 2 percent of inorganic passivating agent such as ferrate or the like is added; a passivation solution stabilizing agent such as 0 to 5 percent of potassium periodate or the like is added; the method of roll coating, dip coating or the like is adopted for evenly coating the passivation solution on the surface of the magnesium alloy; and then non-chromium passivation film with good corrosion resistance is obtained after curing at the temperature above 80 DEG C. The formed film has 'self-healing' function after the composite passivation solution acts on the surface of the magnesium alloy, thus obtaining passivation film with good corrosion resistance and realizing the preparation of environment-friendly passivation film.

Description

technical field [0001] The invention belongs to the field of metal materials and relates to the problem of surface treatment of metal materials, in particular to a passivation treatment solution which improves the corrosion resistance of the surface of magnesium alloy and does not contain hexavalent chromium. Background technique [0002] Magnesium and magnesium alloys are lightweight structural materials with great development potential, but the corrosion resistance of magnesium alloys is poor. Therefore, proper surface treatment to improve the corrosion resistance of magnesium alloys has become a hot research topic. Micro-arc oxidation, laser surface treatment, ion implantation, physical vapor deposition (PVD) and plasma implantation deposition (IBAD) are new technologies for surface corrosion strengthening of magnesium alloys that have emerged in recent years. Some results have been achieved. [0003] As we all know, the surface of magnesium alloys is mainly treated by c...

Claims

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Application Information

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IPC IPC(8): C23C22/60
Inventor 郭婧刘姗姗卢万恒刘亚璇孔祥华杨辉胡守天
Owner UNIV OF SCI & TECH BEIJING
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