Does Parts Still Need Anti-Rust Oil After Blackening on Steel Parts?

Yes, parts still need anti-rust oil after blackening on steel parts.

Reason:

Blackening, or black oxide treatment, provides some corrosion resistance, but it is primarily a cosmetic and aesthetic finish. Black oxide itself is not a sufficient rust inhibitor, especially in harsh environments or when parts are exposed to moisture. The black oxide layer is relatively porous and can allow air and moisture to reach the underlying steel, which can lead to corrosion. Applying anti-rust oil or a similar protective coating helps to seal the pores and offers enhanced protection against rust, extending the lifespan of the part. This is why it is highly recommended to apply a protective layer of oil after blackening for long-term corrosion prevention.

Materials Suitable for Blackening:

Several types of steel and iron-based materials can undergo blackening. The most common materials include:

• Carbon Steel
• Alloy Steel
• Tool Steel
• Cast Iron
• Mild Steel

These materials have a natural tendency to oxidize, making them suitable for black oxide treatment.

Stainless Steel Cannot Be Blackened:

Stainless steel, due to its high chromium content, is resistant to rust but also does not take well to black oxide treatments. As an alternative, electrophoresis (e-coating) is commonly used for stainless steel parts. Electrophoresis is a process that involves applying a protective, corrosion-resistant, and uniform black coating to stainless steel through an electrically charged bath. This method offers better protection and is widely used in industries where both corrosion resistance and aesthetic appearance are important.

Looking for expert assistance in blackening steel parts or other surface treatments? Contact ZC Precision today for high-quality machining and finishing services that meet your specific requirements. Let us help you with the perfect blackening solution for your stainless steel components!