Long-term factors influencing the adhesion of metallized zinc to concrete

Metallized zinc cathodic protection often is used to mitigate steel reinforcement corrosion in concrete, The zinc is flame or are sprayed to the surface of the concrete structure to be protected, The metallized coating should be applied such that its adhesion to concrete is maximized, Factors believed to affect adhesion were investigated for pure zinc and a 85Zn-15Al alloy. On reinforced concrete samples polarized for more than 800 days at three different current densities, adhesion decreased, The reduction increased as a function of time and of the current density applied, When no current was applied, there was a small initial increase of adhesion with time, For the metallized samples that were freeze-thaw cycled, no loss of adhesion was found after 70 cycles.