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Hot dipped galvanised bolts? really?....
9

Hot dipped galvanised bolts? really?....

Hot dipped galvanised bolts? really?....

(OP)
One of the design engineers (the lead) in the office has made a change to a set of drawing notes to the tune of: BOLTS AND WASHERS TO BE ZINC NICKEL ELECTROPLATED and replaced this with HOT DIPPED GALVANISED...

Am I correct in saying that bolts are not actually hot dipped galvanised... as they would be covered in a thick layer of zinc and the nut would not fasten?

that’s why bolts that require a "galvanised" finish are electroplated.... i.e. a thin layer of zinc is bonded to the bolt surface.

Cheers,

The Draffy

TheDraffy

RE: Hot dipped galvanised bolts? really?....

3
No. You are not correct. Consult BS 7371-6 and ASTM F2329 amongst others.

Steve Jones
Materials & Corrosion Engineer

http://www.linkedin.com/pub/8/83b/b04

All answers are personal opinions only and are in no way connected with any employer.

RE: Hot dipped galvanised bolts? really?....

(OP)
Thanks Steve,

Appreciated

C

TheDraffy

RE: Hot dipped galvanised bolts? really?....

2
Some of the structural guys have started pushing for mechanically galvanized bolts instead of hot-dip for more reliable tensioning. I prefer hot-dipped for the improved corrosion protection versus mechanically galvanized. Mechanical galvanizing is a porous coating, while hot-dip is effectively solid.

Zinc plating is typically very thin and provides minimal corrosion protection.

RE: Hot dipped galvanised bolts? really?....

There are several issues associated with hot-dip galvanized structural bolts.

This Specification addresses many:

www.boltcouncil.org/files/2009RCSCSpecification.pd...

Avoiding hot-dip galvanized A-490 bolts is important.

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