How to prevent rust of powder metallurgy parts?
Dec 08, 2022
How to prevent rust of powder metallurgy parts?
Why do powder metallurgy products rust? It often contacts with the air, so it is easy to rust and corrode. If it is in some rainy coastal areas, the air humidity is high, and the corrosion of powder metallurgy products is more serious. In some cases, not only the surface of the product is corroded, but also the surface of the internal connected pores will be corroded, which seriously affects its use performance and even leads to scrapping. How to prevent rust of powder metallurgy parts? The following is a small edition of ZHONGWEI:
powder metallurgy
1. Iron powder rust prevention: since the purchased iron powder is a powder solid, there will be a large number of pores between the iron powder. If wet air is introduced, it will rust and agglomerate in a short time and cannot be used. Therefore, the purchased iron powder is packed in a sealed thick plastic bag, with desiccant installed inside and a thick woven bag outside for easy lifting.
2. Iron powder storage: When iron powder is stored in the warehouse, the principle of first in first out must be followed. The mixed iron powder shall be packed into thick plastic bags according to the packaging method at the time of purchase to prevent the mixed iron powder from being oxidized; Put it on the wooden pallet, and the service time is generally controlled within 3 days.
3. Use of iron powder pressing process: during the production process of pressing synchronizer hub, mix the iron powder with ferrule as required, and do not bring out all the iron powder at one time due to multiple tasks, so as to ensure the use and use of iron powder in each shift, and strictly control the stock of mixed iron powder between processes.
4. Storage of synchronizer hub compact: synchronizer hub compact has low strength and is easy to be damaged, so it must be handled carefully and placed in the plastic tray of the turnover vehicle. If the blank is sintered and pressed within 48 hours, no additional outer packaging protection is required. If the time exceeds, the overturning car will be sealed with plastic film to prevent moist air from entering.
5. Rust prevention test method: after sintering, no rust prevention misuse shall be adopted, and 30 # engine oil shall be used for finishing of powder metallurgy wheel hub; Dip anti rust oil into the film immediately after sintering, and use 30 # engine oil when finishing the P/M gear hub. Combustion combination: dip WD40 antirust oil vertically, and finish the powder metallurgy gear hub with 30 # engine oil.
The above five methods are about rust prevention of powder metallurgy parts, and I hope they can help you!
