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
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[0014] Example 1
[0015] Dry the iron-based powder metallurgy parts at 400°C for half an hour to remove oil (grease), and then use a 20% (mass percentage, the same below) hydrochloric acid solution for rust removal, and rinse with cold water after rust removal. Boil the workpiece after the above treatment for 10 minutes to eliminate the cleaning fluid that may remain inside the workpiece during the degreasing and rust removal process. The boiled workpiece adopts 25% ZnCl 2 With NH 4 Soaking in Cl mixed solution, where ZnCl 2 With NH 4 The mass ratio of Cl is 1:3. After immersing for 2 minutes, the powder metallurgy parts are taken out and dried at 180°C for 20 minutes. After drying, the workpiece can be immersed in pure zinc liquid. The workpiece is immersed in pure zinc liquid for 1 minute to obtain a 30-micron thick hot-dip galvanized layer. Through metallographic analysis, the microscopic pores of the powder metallurgy parts after hot-dip galvanizing are obviously reduced, and...
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[0016] Example 2
[0017] The iron-based powder metallurgy parts are degreasing (grease) with alkaline detergent, and then 20% hydrochloric acid solution is used for rust removal, and then cleaned with cold water after rust removal. Boil the workpiece after the above treatment for 10 minutes to eliminate the cleaning fluid that may remain inside the workpiece during the degreasing and rust removal process. 35% ZnCl is used for the workpiece after boiling 2 With NH 4 Soaking in Cl mixed solution, where ZnCl 2 With NH 4 The mass ratio of Cl is 1:3. After immersing for 2 minutes, the powder metallurgy parts are taken out and dried at 150°C for 30 minutes. After the workpiece is dried, it can be immersed in the pure zinc liquid. The workpiece is immersed in the pure zinc liquid for 2 minutes to obtain a 90-micron thick hot-dip galvanized layer. Through metallographic analysis, the microscopic pores of the powder metallurgy parts after hot-dip galvanizing are obviously reduced, and the...
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[0018] Example 3
[0019] The iron-based powder metallurgy parts were dried at 350°C for half an hour to remove oil (grease), and then a 20% hydrochloric acid solution was used for rust removal, and then washed with cold water after rust removal. Boil the workpiece after the above treatment for 10 minutes to eliminate the cleaning fluid that may remain inside the workpiece during the degreasing and rust removal process. The boiled work piece was painted with 8% potassium fluorozirconate aqueous solution, and then the powder metallurgy piece was taken out and dried at 350°C for 30 minutes. After drying, the workpiece can be immersed in the pure aluminum liquid, and the workpiece is immersed in the pure aluminum liquid for 1 minute to obtain a 30 micron thick hot-dip aluminum coating. According to metallographic analysis, the microscopic pores of the powder metallurgy parts after hot-dip aluminizing are obviously reduced, and the density is increased by 0.8%.
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