• Home
• Product
  • ZnCoat®
  • ZnCoat® Yellow
  • ZnCoat® Black
• Applications
• News/Events
• Contact

Specifications

• Salt Spray (SST)
• IFI-170
• Bimetallic
• Fertilizer

Home » Product » ZnCoat® Black » Bimetallic

Bimetallic Corrosion Resistance Test Results

Bimetalic Corrosion occurs when two metals with different potentials are in contact with each other.  This can result in premature failure, also known as Galvanic corrosion.  Galvanic potential differences between Zinc and Aluminum cause bimetallic corrosion to occur when these materials are mated together. The result is pitting corrosion of the Aluminum surface. ZnCoat® is an advanced coating containing both Zinc and Aluminum. The combination of Zinc and Aluminum in ZnCoat® greatly reduces the bimetallic cell, allowing ZnCoat® fasteners to be mated to Aluminum surfaces without compromising quality.

ZnCoat® Black	Zinc Plating / Trivalent
240 h SST	240 h SST
No pitting of the Aluminum substrate	Medium to dense pitting of the Aluminum substrate
Magnification of Aluminum substrate	Magnification of Aluminum substrate

Tested in SST for 240 hours per ASTMB117.  Washers were rinsed, dried & sandblasted.

 Back to Products page