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Magnesium or magnesium alloy surface hot-dip tinning or tin base alloy method

A technology of tin-based alloy and magnesium alloy, applied in the field of magnesium or magnesium alloy surface treatment, can solve problems such as short immersion plating time, and achieve the effects of good electrical conductivity, simple equipment and strong paintability

Inactive Publication Date: 2010-03-03
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current industrial hot-dip tinning temperature is 300°C, the dipping time is short, and the obtained coating has certain corrosion resistance and wear reduction, and the coating is bright and beautiful, easy to paint, and has the advantages of electrical conductivity and brazing.

Method used

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  • Magnesium or magnesium alloy surface hot-dip tinning or tin base alloy method
  • Magnesium or magnesium alloy surface hot-dip tinning or tin base alloy method
  • Magnesium or magnesium alloy surface hot-dip tinning or tin base alloy method

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0031] Proceed as follows:

[0032] a. Pre-treat the AZ91D magnesium alloy workpiece (30×20×3mm), including alkali cleaning and pickling;

[0033] b. Activation treatment, place the workpiece in the activation solution for 8 minutes;

[0034] c. For pre-nickeling of magnesium alloy, place the above-mentioned activated sample in an alkaline nickel solution for 15 minutes, and the temperature of the plating solution is 78-82°C;

[0035] D, help plating, the sample after nickel plating is dipped in help plating solution (the hydrochloric acid 100ml / L of zinc chloride 700g / L and mass fraction 38%) in help plating 2 minutes;

[0036] e, drying, drying the workpiece after plating at 250°C for 5 minutes;

[0037] f. Hot-dip, heating and melting the tin alloy, hot-dip plating at 290-310°C, hot-dip the workpiece for 10 seconds, and take it out;

[0038] g. Thermal diffusion, heat treatment the workpiece at 220° for 60 minutes to increase the bonding force of the coating and obtain b...

example 2

[0041] Proceed as follows:

[0042] a. Pretreatment of AZ31 magnesium alloy workpiece (30×20×3mm), including alkali cleaning and pickling;

[0043] b. Activation treatment, place the workpiece in the activation solution for 8 minutes;

[0044] c, nickel plating, the above-mentioned activated sample is placed in alkaline nickel solution and plated for 15 minutes;

[0045] D, help plating, the sample after nickel plating is dipped in help plating solution (zinc chloride 700g / L and ammonium hydrogen chloride 36g / L) in help plating 2 minutes;

[0046] e, drying, drying the workpiece after plating at 250°C for 5 minutes;

[0047] f. Hot-dip, heat and melt the tin, perform hot-dip plating at 330-350°C, perform hot-dip plating on the workpiece for 20 seconds, and take it out;

[0048] g. Thermal diffusion, heat treatment the workpiece at 220° for 60 minutes to increase the bonding force of the coating and obtain better surface quality.

[0049] Examples show that a bright and smo...

example 3

[0051] Proceed as follows:

[0052] a. Pretreatment of pure magnesium workpiece (20×20×10mm), including alkali cleaning and pickling;

[0053] b. Activation treatment, place the workpiece in the activation solution for 8 minutes;

[0054] c, nickel plating, the above-mentioned activated sample is placed in alkaline nickel solution and plated for 15 minutes;

[0055] D, help plating, the sample after nickel plating is dipped in help plating solution (zinc chloride 700g / L and ammonium hydrogen chloride 36g / L) in help plating 2 minutes;

[0056] e, drying, drying the workpiece after plating at 250°C for 5 minutes;

[0057] f. Hot-dip, heating and melting the tin, hot-dip plating at 330-350°C, hot-dip the workpiece for 20 seconds, and take it out;

[0058] g. Thermal diffusion, heat treatment the workpiece at 220° for 90 minutes to increase the bonding force of the coating and obtain better surface quality.

[0059]Examples show that a bright and smooth tin layer is obtained o...

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Abstract

The invention relates to a magnesium or magnesium alloy surface hot-dip tinning or tin base alloy method, belonging to the magnesium alloy surface treatment field. The method includes that a nickel protective layer is precoated on magnesium or magnesium alloy surface by chemical treatment, so as to prevent oxidation of matrix and reaction with plating assistant agent in plating assistant, hot dipping of low melting point alloy (such as tin, tin base alloy and the like) is carried out after plating assistant, and finally heat treatment is carried out on work piece to improve quality of surfacecoating. The coating obtained by the method is continuous and uniform and has certain abrasive resistance, anti-attrition and decay resistance performances; and meanwhile the tin layer has low resistivity and favorable solder ability. The hot dipping technology is mature and reliable and is convenient for practical production and application.

Description

technical field [0001] The invention relates to the surface treatment of magnesium or magnesium alloy, which adopts the method of hot-dipping tin and tin-based alloy and other low-melting-point alloys to change the surface characteristics of the magnesium alloy so that the surface of the magnesium alloy has the characteristics of anticorrosion and wear resistance. Background technique [0002] Magnesium not only has the characteristics of small specific gravity, high specific strength and specific stiffness, and good thermal conductivity, but also has good damping and shock absorption and electromagnetic shielding properties. It has become the preferred material for modern automobiles, electronics, communications and other industries. However, problems such as poor corrosion resistance and poor wear resistance of magnesium alloys limit the scope of its application. Therefore, proper surface treatment to enhance the corrosion resistance of magnesium alloys has important pract...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/08C23C2/02C23C2/28C23C18/18C23C18/32C23C18/36C23C28/02
Inventor 戈晓岚陈志超曾兵
Owner JIANGSU UNIV
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