Black Chromate Application

2024-08-07 By Cherry  

The black chromate mainly involves surface treatment technology,

which aims to improve the corrosion resistance, wear resistance

and aesthetics of the products. ‌

Die-cast products usually need to be surface-treated to

improve their physical and chemical properties.

Black chromate treatment is a common surface treatment method

that improves the corrosion resistance and wear resistance of

the product by forming a passivation film on the surface of

the die-casting.

This treatment not only protects the die-casting from erosion

of the external environment, but also enhances its

service life and aesthetics. ‌

Specifically, the process of black chromate treatment includes

several key steps: ‌

1. Surface cleaning:

First, the die-casting needs to be thoroughly

cleaned to remove contaminants that may remain during the manufacturing

process, such as polishing fluids, particle cuttings, and mold release

agents.

This is usually done by using wet chemical techniques, such

as aqueous surfactant solutions (which may contain acids or organic solvents). ‌

2. Deburring and vibration blasting: 

After cleaning, sharp corners and edges on metal parts are rounded to remove

small debris and raised edges.

This step is completed by vibratory shot blasting, a common method in mass

production, which can effectively eliminate residues that affect quality

and make the surface of the workpiece smooth. ‌

3. Chromating: 

After proper cleaning and deburring, the die casting can be chromated.

This step can form a passivation film on the surface of the die-cast aluminum alloy,

which can be colorless to yellow and does not affect the surface resistance, thereby

providing additional protection against corrosion. ‌For die castings that require higher

corrosion resistance requirements, spraying can be performed after chromatin

to further improve the protective effect. ‌

4. Wear-resistant and high-temperature-resistant coating:

In addition to the basic anti-corrosion function, chromates,

and dichromates can also be used as additives for wear-resistant

coatings to improve the hardness and wear resistance of the

coating. ‌This coating is suitable for floors, industrial

equipment, and other fields, and can effectively resist wear

and scratches. In addition, due to the high thermal stability of

chromates and dichromates, they can also be used in high-temperature

resistant coatings to protect materials from maintaining good

stability and performance in high-temperature environments. ‌

Conclusion

The application of black chromates in die casting

products are not limited to providing corrosion protection,

but also includes improving the wear resistance and

high-temperature resistance of the product, thereby enhancing

the overall performance and life of the product.

To learn more info about Die Casting Machines, pls contact

LK OFFICIAL AGENT OFFICE DCM

LK Die Casting Machine Official Agent for Egypt(EGY), Saudi Arabia(ksa),United Arab Emirates(UAE),

the Islamic Republic of Iran(Iran), Qatar(QAT), the State of Kuwait(Kuwait)

Address: Industry Zone, South of Port Said Kebly, Egypt

https://www.zazdiecasting.com/

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