Dacromet vs Hot Dip Galvanizing? 2

[IJR]

Pals

I will appreciate a brief discussion on the pros and cons of these two methods of metal protection

Or you can suggest some literature

respects
IJR

 

[swall]

It might help if you could describe your application.

 

[IJR]

My application involves corrosion protection of high strength anchor rods which will be prestressed against fatigue failure.

The rods are European grade 8.8 (almost equivalent to the steel used in ASTM A325 bolts)

respects
IJR

 

[swall]

Dacromet is baked at around 500F after application, whereas galvanize is done at the temperature of molten zinc (780F) or hotter. With the latter, you may get some stress relief of the parts that may be a problem for you.

 

[CoryPad]

Just to emphasize swall's response, it is standard to use a non-electrolytical zinc-rich coating rather than hot-dipped galvanizing on high-strength fasteners. The high temperature of the molten zinc may reduce the strength of the fasteners. Dacromet is only one of multiple types of non-electrolytic zinc-rich coatings. You should consider products from Magni and Doerken as well.

Regards,

Cory

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

 

[hokie66]

It is also standard to galvanize grade 8.8 bolts. I am not aware of any problems this causes.