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Magnesium alloy surface chromium-free composite passivation solution

A passivation solution, magnesium alloy technology, applied in the direction of metal material coating process, etc., to achieve the effect of good environmental protection, excellent corrosion resistance, and fast film formation

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

[0011] A kind of chromium-free composite passivation solution on the surface of magnesium alloy, the composition of this passivation solution is: sodium molybdate 12g / L, manganese dihydrogen phosphate 8g / L, calcium dihydrogen phosphate 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, OP-100.3g / L, the balance is deionized water.

Embodiment 2

[0013] A chromium-free composite passivation solution on the surface of a magnesium alloy, the passivation solution is composed of: sodium molybdate 14g / L, manganese dihydrogen phosphate 6g / L, calcium dihydrogen phosphate 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, OP-100.5g / L, the balance is deionized water.

Embodiment 3

[0015] 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, 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, the balance is deionized water.

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PUM

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Abstract

The present invention discloses a magnesium alloy surface chromium-free composite passivation solution, which 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.

Description

technical field [0001] The invention relates to the technical field of surface treatment, in particular to a chromium-free composite passivation solution for the surface of magnesium alloys. 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 application prospect in ve...

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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