What is the difference between Dacromet and other surface treatments for double - head bolts?

Hey there! As a supplier of Dacromet Double - head Bolts, I often get asked about the differences between Dacromet and other surface treatments for double - head bolts. So, I thought I'd write this blog to share some insights on this topic.

First off, let's talk about what Dacromet is. Dacromet is a kind of anti - corrosion coating technology. It involves applying a special coating to the surface of double - head bolts. This coating is made up of zinc, aluminum flakes, and a special binder. When it's applied to the bolt, it forms a dense protective layer that offers excellent corrosion resistance. You can check out our Dacromet Double - head Bolt for more details.

Now, let's compare Dacromet with some other common surface treatments for double - head bolts.

Galvanizing

Galvanizing is one of the most widely used surface treatments for bolts. It works by coating the bolt with a layer of zinc. There are two main types of galvanizing: hot - dip galvanizing and electro - galvanizing.

Hot - dip Galvanizing

Hot - dip galvanizing involves dipping the bolt into a bath of molten zinc. This creates a thick zinc coating that provides good corrosion protection. However, compared to Dacromet, hot - dip galvanizing has some drawbacks. The coating is relatively thick, which can sometimes affect the fit of the bolt in certain applications. Also, the process requires high temperatures, which can cause the bolt to distort, especially for smaller or more precise double - head bolts.

Electro - galvanizing

Electro - galvanizing, on the other hand, uses an electric current to deposit a thin layer of zinc onto the bolt. This method gives a more uniform and smoother coating compared to hot - dip galvanizing. But the coating thickness is usually much thinner than that of hot - dip galvanizing and Dacromet. As a result, its corrosion resistance is not as good, especially in harsh environments.

In contrast, Dacromet offers a thinner but more effective coating. It can provide long - term corrosion protection even in highly corrosive environments like marine or industrial settings. And since the coating process doesn't involve high temperatures, there's no risk of bolt distortion.

Black Oxide Coating

Black oxide coating is another popular surface treatment for bolts. It creates a black finish on the bolt, which not only gives it an aesthetically pleasing look but also provides some degree of corrosion resistance. The process involves chemically reacting the surface of the bolt with an oxidizing agent.

However, the corrosion resistance of black oxide coating is relatively limited. It's mainly suitable for indoor or less corrosive environments. If the double - head bolt is going to be used in outdoor or harsh conditions, Dacromet is a much better choice. Our 10.9 Grade Black Double - head Bolt can be an option if you're looking for a bolt with a black finish, but for better corrosion protection, Dacromet is recommended.

Phosphating

Phosphating is a process that forms a phosphate coating on the surface of the bolt. This coating can improve the adhesion of subsequent coatings, such as paint or oil, and also provides some corrosion resistance.

The phosphate coating is porous, which means it can hold lubricants or other protective substances. But its corrosion resistance alone is not as good as Dacromet. Dacromet's dense and non - porous coating offers better protection against moisture and corrosive agents. And unlike phosphating, Dacromet doesn't require additional coatings for long - term protection in most cases.

Advantages of Dacromet for Double - head Bolts

Corrosion Resistance

As mentioned earlier, Dacromet provides excellent corrosion resistance. The zinc and aluminum flakes in the coating form a barrier that prevents oxygen and moisture from reaching the surface of the bolt. This makes it suitable for a wide range of applications, from automotive to construction.

High - temperature Resistance

Dacromet can withstand relatively high temperatures without losing its anti - corrosion properties. This is important in applications where the bolts are exposed to heat, such as in engines or industrial furnaces.

Environmental Friendliness

Compared to some traditional surface treatments like chromate - based coatings, Dacromet is more environmentally friendly. It doesn't contain harmful heavy metals like chromium VI, which is a known carcinogen.

Uniform Coating

The Dacromet coating process can ensure a uniform coating on the entire surface of the double - head bolt, including hard - to - reach areas. This means that every part of the bolt is protected equally, reducing the risk of localized corrosion.

Applications of Dacromet Double - head Bolts

Dacromet double - head bolts are used in various industries. In the automotive industry, they're used in engine components, chassis, and suspension systems. The excellent corrosion resistance of Dacromet ensures the long - term reliability of these parts, especially in areas where road salt is used in winter.

In the construction industry, GB901 Double - headed Bolt with Dacromet coating can be used in structures exposed to the elements, such as bridges and buildings. The high - temperature resistance of Dacromet also makes it suitable for industrial applications where the bolts are exposed to heat and corrosive chemicals.

Conclusion

In conclusion, Dacromet offers many advantages over other surface treatments for double - head bolts. Its superior corrosion resistance, high - temperature performance, environmental friendliness, and uniform coating make it a great choice for a wide range of applications.

If you're in the market for double - head bolts and are looking for a reliable and long - lasting surface treatment, Dacromet is definitely worth considering. Whether you need bolts for automotive, construction, or industrial use, we can provide you with high - quality Dacromet double - head bolts.

If you're interested in our products or have any questions about Dacromet double - head bolts, feel free to reach out to us for a purchase negotiation. We're here to help you find the best solution for your needs.

References

• ASM Handbook Volume 5: Surface Engineering.
• Corrosion Basics: An Introduction by Mars G. Fontana.