Surface treatment process for iron-base sintered metal piece

An iron-based powder metallurgy and surface treatment technology, which is applied in the direction of metal material coating process, coating, hot-dip plating process, etc., can solve the problems of high production cost, poor applicability, polluted plating solution, etc., and achieve good surface integrity , Improve the density, the effect of strong feasibility

Inactive Publication Date: 2007-06-06
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After adopting the above-mentioned sealing method, the quality of the coating has been improved to some extent, but there are also disadvantages such as poor applicability, polluted plating solution, high production cost, and complicated process to varying degrees.
At the same time, such a sealing method also has defects such as low hard bottom, poor corrosion resistance, and poor air tightness.

Method used

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  • Surface treatment process for iron-base sintered metal piece
  • Surface treatment process for iron-base sintered metal piece
  • Surface treatment process for iron-base sintered metal piece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Dry the iron-based powder metallurgy parts at 400°C for half an hour to remove oil (grease), then use 20% (mass percentage, the same below) hydrochloric acid solution for derusting treatment, and wash with cold water after derusting. Boil the workpiece treated above for 10 minutes to eliminate the cleaning solution that may remain inside the workpiece during the degreasing and rust removal process. The boiled workpiece uses 25% ZnCl 2 with NH 4 Cl mixed solution for soaking, in which ZnCl 2 with NH 4 The mass ratio of Cl was 1:3. After soaking for 2 minutes, the powder metallurgy parts were taken out and dried at 180°C for 20 minutes. After the workpiece is dried, it can be immersed in the pure zinc liquid, and the workpiece is dipped in the pure zinc liquid for 1 minute to obtain a 30 micron thick hot-dip galvanized layer. According to metallographic analysis, the micropores of the powder metallurgy parts after hot-dip galvanizing are obviously reduced, and the den...

Embodiment 2

[0017] Use alkaline detergent to remove oil (grease) from iron-based powder metallurgy parts, then use 20% hydrochloric acid solution to remove rust, and wash with cold water after rust removal. Boil the workpiece treated above for 10 minutes to eliminate the cleaning solution that may remain inside the workpiece during the degreasing and rust removal process. The boiled workpiece uses 35% ZnCl 2 with NH 4 Cl mixed solution for soaking, in which ZnCl 2 with NH 4 The mass ratio of Cl was 1:3. After soaking for 2 minutes, the powder metallurgy parts were taken out and dried at 150°C for 30 minutes. After the workpiece is dried, it can be immersed in the pure zinc liquid, and the workpiece is dipped in the pure zinc liquid for 2 minutes to obtain a 90 micron thick hot-dip galvanized layer. According to metallographic analysis, the micropores of the powder metallurgy parts after hot-dip galvanizing are obviously reduced, and the density is increased by 1.6%. Figure 1 is an op...

Embodiment 3

[0019] Dry the iron-based powder metallurgy parts at 350°C for half an hour to remove oil (grease), then use 20% hydrochloric acid solution for rust removal, and wash with cold water after rust removal. Boil the workpiece treated above for 10 minutes to eliminate the cleaning solution that may remain inside the workpiece during the degreasing and rust removal process. The boiled workpiece was painted with 8% potassium fluozirconate aqueous solution, and then the powder metallurgy piece was taken out and dried at 350° C. for 30 minutes. After the workpiece is dried, it can be immersed in the pure aluminum liquid, and the workpiece is dip-coated in the pure aluminum liquid for 1 minute to obtain a 30-micron thick hot-dip aluminum layer. According to metallographic analysis, the micropores of the powder metallurgy parts after hot-dip aluminum plating are obviously reduced, and the density is increased by 0.8% at the same time.

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Abstract

The surface treatment process for iron-base sintered metal piece includes the following steps: conventional deoiling and dedusting treatment, the subsequent water boiling to eliminate residual cleaning liquid, soaking in or brushing with proper hot dip coating promoter, stoving, and soaking in hot dip coating metal liquid for 10 sec to 2 min to obtain coating in the required thickness.

Description

technical field [0001] The invention relates to a surface treatment method for iron-based powder metallurgy parts. Specifically, the present invention relates to a method for surface treatment of iron-based powder metallurgy parts using hot-dip technology. Background technique [0002] Powder metallurgy technology can effectively improve product performance, reduce mechanical processing, reduce costs, and save energy. It has great advantages, and can produce products with complex shapes, precise dimensions, and low prices. Therefore, powder metallurgy products are widely used in automobile, motorcycle industry and other related industries. Among powder metallurgy products, iron-based powder metallurgy products account for the largest proportion. Powder metallurgy parts generally contain 10% to 30% of pores. Oil and impurities are easy to penetrate into the pores, and it is difficult to remove them by conventional degreasing process, which brings many difficulties to surfac...

Claims

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Application Information

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IPC IPC(8): C23C2/04C23C2/06C23C2/12C23C2/14
Inventor 陈刚
Owner JIANGSU UNIV
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