An Electrochemical Based Investigation of Corrosion Inhibit Hydrophobic Ptfe Decorated Tin Coating in Dilute Nacl Solution

Present work demonstrates the electrochemical corrosion characteristics of polytetrafluorethylene (PTFE) decorated TiN nano-cluster coating on stainless steel (SS-304) for corrosion resistant applications. Both the layers were directly deposited by RF magnetron sputtering in two steps. The basic microscopic, spectroscopic and nanoindentation experiments were employed to examine the essential properties of prepared coatings. However, electrochemical and contact angle experiments were utilized to examine the corrosion characteristic. The results revealed that the PTFE decoration modify the hydrophilic character (θw ~ 78.2°±2°) of the alloy surface into almost superhydrophobic character (142.6°±2°), indorsing the aqueous protection characterstics. The long-time immersion (6 h) measurements demonstrated the least corrosion rate of decorated surface (0.0026 µm/year) with low surface energy (4.81 & 1.46 mN/m) and better hardness (16.78 ± 0.36 GPa). Maximum wear resistance (H/Er ~ 0.064) and maximum resistance to fatigue fracture (H3/Er2 ~ 0.068 GPa) have also been obtained for that surface. The decorated surface durability was also investigated as a function of air exposure time and immersion time in chloride solution. A process describing the formation of corrosion initiation and products was also discussed in detail.