Production of uniform nanocomposite coating of polypyrrole carbon nanotube/ cadmium oxide to protect corrosion of austenitic stainless steel 304

In this research, a uniform film of polypyrrole/CNT/cadmium oxide nanocomposite was produced to protect the austenitic stainless steel 304 against corrosion in 0.5 molar hydrochloric acid medium. For this purpose, the chemical deposition method was used for CNT / CdO synthesis. Electrochemical synthesis method was used to coat the stainless steel and to find optimal coating conditions. Polarization tests were used to find the optimum amount of reinforcement nanocomposite. Optical microscope and scanning electron microscope (SEM) were used to study the morphology of coating. Results showed that the final nano composite had a remarkable corrosion resistance and the presence of CNT / CdO reduced the porosities in the final polymer film. Also coating results showed that the optimum amount of apply current density and pH for electropolymerization were 4mA/cm2 and 9 respectively. The 0.5% weight-volumetric functionalized carbon nanotube with Cadmium Oxide was determined as optimum amount of nano composite reinforcement using a polypyrrole matrix. Polypyrrole Carbon nanotube/Cadmium Oxide nanocomposite coating on the surface of austenitic stainless steel 304 protected more than 98% against corrosion in a 0.5 M solution hydrochloric acid.