Chromate-free compositions for applying a conversion or passivation coating for metals, more particularly zinc coated metal surfaces. In some examples, the at least one third portion may be separable from the first and second portions to further simplify the surgical procedure and reduce irritation to the patient. Preferably, the treatment cap includes a main body portion having provided therein an electricity generating device and an ozone generating device. The membrane, which may comprise stretch wrap or shrink wrap, may be adhered in place, for example, using water resistant tape, an adhesive, mechanical fasteners, or a girdle sheet that is wrapped around the vertical walls of the building structure so as to capture the protective membrane between the girdle sheet and the vertical walls.