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Brightening etchant for magnesium alloy

A bright etching, magnesium alloy technology, applied in the field of magnesium alloy bright etching agent, can solve the problems of polluted environment, over-corrosion and pitting, gray-white and so on

Inactive Publication Date: 2003-10-22
FAW GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned pretreatment processes are complicated, high in production cost, high in energy consumption, pollute the environment, and have a large amount of corrosion on magnesium alloy parts, which are prone to over-corrosion and pitting corrosion, and the effect of removing stubborn fouling layers such as carbon layers on the surface is poor. And can only get off-white, uneven appearance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0007] Example 1: H 2 SO 4 (d=1.84) 100mL

[0008] HNO 3 (d=1.51) 30mL

[0009] .t: 10 τ: 10

Embodiment 2

[0010] Example 2: H 2 SO 4 (d=1.84) 100mL

[0011] H 2 O 2 (d=1.46) 15mL

[0012] .t: 20 τ: 10

Embodiment 3

[0013] Example 3: H 2 SO 4 (d=1.84) 100mL

[0014] H 2 O 2 (d=1.46) 15mL

[0015] H 3 PO 4 (d=1.87) 15mL

[0016] .t: 15 τ: 15

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PUM

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Abstract

The present invention relates to a magnesium alloy bright etchant. It is mainly formed from oxidative concentrated sulfuric acid as basic liquor and additive consisting of HNO3, HF, H3PO4 and H2O2, etc. and the volume ratio of the basic liquor and additive is 1:0.1-0.5. Said invention has the characteristics of small procedure, low production cost, low pollution, high-quality magnesium alloy component surface, large working range and short etching time.

Description

(1) Technical field [0001] The invention relates to a magnesium and magnesium alloy surface treatment preparation, in particular to a magnesium alloy bright etching agent. (2) Background technology [0002] Magnesium alloy has the characteristics of light weight (d=1.73), high specific strength, noise reduction and vibration reduction, and recyclability. It plays an important role in the lightweight, energy saving, and environmental protection of industrial products. Therefore, it has been widely used in various industries of industrial production, especially in the 3C industry, aerospace industry, and automobile industry. However, due to the strong chemical activity of magnesium alloy (E=-2.4V), atmospheric corrosion, contact corrosion, abrasion corrosion and other phenomena are prone to occur in the atmosphere. Therefore, directly using parts made of magnesium alloys must be surface treated. [0003] In addition, because magnesium alloy parts usually adopt die-casting molding p...

Claims

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Application Information

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IPC IPC(8): C23F1/22
Inventor 徐关庆
Owner FAW GROUP
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