Relationship Between Corrosion Potential of
Mild Steel and Adsorption Properties of the Inhibitors
Wang Baocheng, Zhu Jinhua
(State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University,
Xi'an 710049, China)
Abstract: Inhibition behaviors of hexamine (HA) and sodiumdiethyldithiocabamate
(SDEDTC) were tested in the system of mild steel£¯hydrochloric acid. The relation between
the corrosion potential of the system and temperature, and the criteria for corrosion
potentials of different corrosion-inhibitive types of inhibitors were derived
theoretically. The experimental results show that the variation of mild steel corrosion
potentials after adding inhibitors is linear with respect to the reciprocal of
temperature. HA is an anodic type inhibitor, and SDEDTC is a mixed type inhibitor. Their
adsorption forms are physical, and the adsorption heat reaches to -35 kJ£¯mol (HA) and
-30 kJ£¯mol (SDEDTC) , respectively.
Keywords: mild steel; corrosion potential; inhibitor; adsorption heat