Zinc is more reactive than iron when exposed to oxygen and moisture is zinc will corrode faster than iron so if we put them together sink protects iron but is sacrificing itself,hence the term sacrificial protection,this method is applied to prevent resting on ships,in the oxidation of zinc can be described using this following equation,so beside preventing resting there is another adventage to this galvenizing process the formed is zinc oxide rayer can be removed and the freshly exposed the sink can corrode once again thereby futher protecting the iron or steel hall