Corosion Resistant Coatings

[brakemeister]

I have an application in which I will be gluing a friction material to mild steel which needs to have a corosion resistant coating. Currently, the coating is zinc phosphate but I can switch to zinc di-chromate if need be. The adhesive is phenolic based and is baked at 400 degrees F.

My question is would one of these plating techniques bond more tightly to the steel and, thus, form a better substrate for the adhesive?

 

[Goahead]

Why not using zinc plating - galvanized steel?

http://www.welding-advisers.com/

 

[MintJulep]

Do you really need a plating at all on the surface that you are bonding to? The phenolic adhesive and the other friction material should from a pretty good corrosion barrier on that surface.

 

[israelkk]

As a base for adhesive bonding adhesion the zinc phosphate coating is much superior to zinc di-chromate.

 

[brakemeister]

The friction is only bonded to a small percentage of the surface of the part. The part has to pass a salt spray test.