Does Sintered Steel Rust ?

⚙️ The possibility of rust in sintered steel
Sintered steel is a type of steel produced through powder metallurgy processes, and its ability to rust mainly depends on two core factors: composition, structure, and usage environment
The material composition determines the basic rust prevention ability
• If it is sintered steel made of ordinary carbon steel material, it does not contain anti rust alloy elements. Like ordinary steel, it is prone to oxidation reaction and rusting when exposed to corrosive media such as water, oxygen, acid and alkali.
• If anti rust elements such as chromium and nickel are added to sintered steel (such as sintered stainless steel) to form a composition structure similar to stainless steel, a dense passivation film can be generated on the surface, greatly improving the anti rust ability and making it less prone to rusting.
The pore structure accelerates the corrosion process, and there are certain pores inside the sintered steel, which is a characteristic of powder metallurgy technology. Compared to dense steel, these pores are more prone to accumulating moisture and corrosive substances, which can become the starting point of rust and accelerate the speed and degree of rust. Even sintered steel containing rust prevention elements may experience localized rust at the pores.

🛡️ Common methods of rust prevention treatment
To avoid rusting of sintered steel, the following measures are usually taken:
• Surface coating: A protective layer is formed on the surface of sintered steel by galvanizing, chrome plating, electrophoresis, and other methods to isolate external corrosive media.
• Oil immersion treatment: Immerse sintered steel in rust proof oil to fill the pores and reduce contact between moisture and oxygen.
• Densification treatment: By using processes such as hot forging and hot pressing, the internal pores of sintered steel are reduced, reducing the probability of corrosion.

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