The plan-view images in 6 shows also that the increase in the oxidation temperature of the porous zinc layer causes a change in morphology for each sample from whiskers to more spherical particles. Therefore, agglomeration of the material is observed, which can lead to a decrease in the specific surface area of the film. This phenomenon was observed for all morphologies except samples from batch B, which retained their morphology to a much greater extent than the samples from other batches.