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Magnesium alloy surface chromium-free composite passivation solution preparation process

A technology of passivation solution and magnesium alloy, which is applied in the coating process of metal materials, etc., to achieve the effects of fast film formation, high efficiency and good environmental protection effect

Inactive Publication Date: 2015-02-11
WUXI SHITANGWAN IND PARK DEV CONSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The currently reported chromium-free conversion treatment processes mainly include phosphate treatment, phosphate-permanganate treatment, fluorozirconate or fluorotitanate treatment, stannate treatment, molybdate or tungstate, vanadate treatment, cobalt salt treatment, etc., but compared with traditional chromate treatment technology, there is still room for improvement in improving treatment efficiency, lowering treatment temperature, and improving corrosion resistance, and it cannot replace chromate treatment technology. Chromium-free conversion treatment technology on the surface of magnesium alloy with high-efficiency film formation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] A preparation process for a chromium-free composite passivation solution on the surface of a magnesium alloy, the composition of the passivation solution is: the composition of the passivation solution used in the process is: sodium molybdate 12g / L, manganese dihydrogen phosphate 8g / L, phosphoric acid Calcium dihydrogen 4g / L, zinc oxide 16g / L, 85% phosphoric acid 26g / L, sodium nitrate 8g / L, calcium chlorate 2g / L, boric acid 4g / L, strontium chloride 1g / L, potassium peroxide 4g / L L, OP-100.3g / L, and the balance is deionized water; the preparation process is: take an appropriate amount of deionized water, dilute phosphoric acid, then slowly add zinc oxide that has been adjusted into a paste in advance, stir while adding, and wait until It is all dissolved, and then sequentially add sodium molybdate, manganese dihydrogen phosphate, calcium dihydrogen phosphate, sodium nitrate, calcium chlorate, boric acid, strontium chloride, potassium peroxide, OP-10 and the remaining deion...

Embodiment 2

[0012] A preparation process for a chromium-free composite passivation solution on the surface of a magnesium alloy, the composition of the passivation solution is: the composition of the passivation solution used in the process is: sodium molybdate 14g / L, manganese dihydrogen phosphate 6g / L, phosphoric acid Calcium dihydrogen 6g / L, zinc oxide 14g / L, 85% phosphoric acid 28g / L, sodium nitrate 6g / L, calcium chlorate 4g / L, boric acid 2g / L, strontium chloride 3g / L, potassium peroxide 2g / L L, OP-100.5g / L, and the balance is deionized water; the preparation process is: take an appropriate amount of deionized water, dilute phosphoric acid, then slowly add zinc oxide that has been adjusted into a paste in advance, stir while adding, and wait for It is completely dissolved, and then sequentially add sodium molybdate, manganese dihydrogen phosphate, calcium dihydrogen phosphate, sodium nitrate, calcium chlorate, boric acid, strontium chloride, potassium peroxide, OP-10 and the remaining ...

Embodiment 3

[0014] A preparation process for a chromium-free composite passivation solution on the surface of a magnesium alloy. The passivation solution is composed of: sodium molybdate 13g / L, manganese dihydrogen phosphate 7g / L, calcium dihydrogen phosphate 5g / L, zinc oxide 15g / L L, 85% phosphoric acid 27g / L, sodium nitrate 7g / L, calcium chlorate 3g / L, boric acid 3g / L, strontium chloride 2g / L, potassium peroxide 3g / L, OP-100.4g / L, balance It is deionized water; the preparation process is: take an appropriate amount of deionized water, dilute phosphoric acid, then slowly add zinc oxide that has been adjusted into a paste in advance, stir while adding, and wait for it to completely dissolve, then add sodium molybdate, Manganese dihydrogen phosphate, calcium dihydrogen phosphate, sodium nitrate, calcium chlorate, boric acid, strontium chloride, potassium peroxide, OP-10 and the remaining deionized water were added, stirred for 25 minutes, and then adjusted to pH 2.5.

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PUM

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Abstract

The present invention discloses a magnesium alloy surface chromium-free composite passivation solution preparation process, wherein the passivation solution comprises 12-14 g / L of sodium molybdate, 6-8 g / L of manganese dihydrogen phosphate, 4-6 g / L of calcium dihydrogen phosphate, 14-16 g / L of zinc oxide, 26-28 g / L of 85% phosphoric acid, 6-8 g / L of sodium nitrate, 2-4 g / L of calcium chlorate, 2-4 g / L of boric acid, 1-3 g / L of strontium chloride, 2-4 g / L of potassium peroxide, 0.3-0.5 g / L of OP-10, and the balance of deionized water. The preparation process comprises: diluting phosphoric acid with deionized water, adding zinc oxide blended into a paste while stirring, sequentially adding sodium molybdate, manganese dihydrogen phosphate, calcium dihydrogen phosphate, sodium nitrate, calcium chlorate, boric acid, strontium chloride, potassium peroxide, OP-10 and the remaining deionized water after the zinc oxide is completely dissolved, stirring for 20-30 min, and adjusting the pH value to 2-3.

Description

technical field [0001] The invention relates to the technical field of surface treatment, in particular to a preparation process of a chromium-free composite passivation solution on the surface of a magnesium alloy. Background technique [0002] Magnesium alloys are characterized by light weight, high specific strength, recyclability, and good casting performance. They are known as green metal structural materials in the 21st century. They have broad application prospects in aerospace, automotive, electronics, and military industries. In recent years grow at a rate of 20%. Especially due to the lightweight requirements of vehicles such as automobiles, motorcycles, bicycles, trains, etc., and the rapid development of 3C electronic products such as mobile phones, computers, MP3, cameras, video cameras, etc., magnesium alloy materials have good light weight and vibration reduction properties. , good anti-electromagnetic interference and recyclability, it has a very promising a...

Claims

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Application Information

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IPC IPC(8): C23C22/42
CPCC23C22/42
Inventor 庄进
Owner WUXI SHITANGWAN IND PARK DEV CONSTR
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