Anodic Zinc.

Some years ago anodic zinc programs where developed.

The basis of those programs is :

•       Zinc is not introduced as inorganic salt (ZnCl2 or ZnSO4), like in traditional treatment. The source is a complexed ion, like in the figure below.

•       This complexed ion has negative charge, so under ion migration conditions is traveling to the anode.

•       At the anode reacts with ferrous ions, created from the corrosion of the anode.

•       Zinc is liberated from the reaction, and precipitates at the anode.

Anodic Zinc, being an anodic inhibitor, has identical performances to anodic inhibitors, as it concerns general corrosion, and presents a little bit better performances against pitting.

As it concerns the differential aeration cells, anodic zinc has some ability to penetrate to the porous deposits and to reach the anode behind.

This ability is related to the type of stabilizer in use for the zinc stabilization and the type of the deposit. If successful, anodic zinc performs better than cathodic inhibitors, but less than chromate.

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