Enhancing Corrosion Resistance Through Superhydrophobic Modification


R. Sudhakaran, S. Babu, A. Sivarajan & T. Asokan
Govt. Arts College, Tiruchirappalli – 22, Affiliated to Bharathidasan University, Tiruchirappalli-24,Tamil Nadu, India.

T. Kasilingam, Theivanai Ammal College for Women (Autonomous), Villupuram, Tamil Nadu, India.


Induced by the lotus effect in which water droplets falling on the leaves bead up and roll off, copper immersed in potable water in the presence of binary inhibitor system (Zn2+ and trisodium citrate) were attempted to create hydrophobic surfaces. However, the water contact angle in presence of inhibitor system was found to be 155°±4°, whereas in the case of copper, it was 84°±2°. A detailed description of the surface-modified superhydrophobic in potable water on copper. The protection of copper surface using trisodium citrate with Zn2+ in potable water medium was investigated by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization studies (PDS). Surface examination techniques like Scanning electron microscope (SEM), Energy dispersive x-ray analysis (EDX), Atomic force microscope (AFM) and Water contact angle (WCA) were also performed. PDS results revealed the formulation acted as a mixed type inhibitor. Adsorption of used inhibitor lead to a decrease in the double layer capacitance and an increase in the charge transfer resistance and confirm the formation of protective layer by EIS, SEM, EDX, AFM and WCA measurement technique. Simple approach was developed for generating superhydrophobic surface modification of copper.