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Steel reinforced concrete usually protected against corrosion by passivation of the steel arising from the high alkalinity of the pore solution within the geopolymer concrete. The ingress of chlorides to the steel or concrete interface or carbonation of the concrete reducing the alkalinity of the pore solution at the steel or concrete interface. This will cause loss of durability in reinforced concrete. The corrosion behavior of steel embedded in geopolymer paste was studied by open circuit potential,  E ocp and potential zero charge method Epzc under 3.5% NaCI solution exposure. The  E corr (-660 mV vs SCE) more negative than  E pzc value (-630 mV vs SCE). It shows the steel plate have an excessive negative charges. It is noted that the zero charge corrosion protection (ZCCP) method successfully prevents the steel surface suffering from corrosion. Therefore, it is strongly believed that metal under Epzc is not in contact with H+ and OH− ionic charges due to the absence of electrical charge as well as electrostatic attraction on metal surface.

Preliminary study of zero charge corrosion protection on steel plate embedded in geopolymer paste