M.Sangeetha [a]*,S.Rajendran [b], J.Sathiyabama[c], T. Umasankareswari[d],
A Krishnaveni [e] and RM Joany[f]
* Corresponding Authors
[a]. Department of Chemistry (S&H), K.S.Rangasamy College of Technology, Tiruchengode, Tamil Nadu, India, E-mail:firstname.lastname@example.org
[b]. Corrosion Research Centre, Department of Chemistry, RVS School of Engineering and Technology, Dindigul – 624005, E-mail: email@example.com ,
[c]. PG and Research Department of Chemistry, GTN Arts College, Dindigul – 624005, Tamil Nadu, India,
[d] Department of Chemistry, Rajapalyam Rajus College, Rajapalayam, Inida
[e] Department of Chemistry, Yadava College, Madurai, India
[f] Sathyabama University, Chennai, India.
Most of the flowers are coloured. Colourless flowers have attractive fragrance. Hence Extracts of flowers have active principles containing polar atoms such as nitrogen, oxygen, sulpher and phosphorus. The active principle molecules pump electrons towards the metal surface through these electron rich centers. Thus the release of electron from the metal surface is prevented. Thus Corrosion of metals is prevented by flower extracts. Weight loss and electrochemical studies have been employed to evaluate the corrosion inhibition efficiencies of the extracts of flowers. Usually aqueous extracts are conveniently employed. Adsorption of active principle on the metal surface obey Langmuir, temkin and frenlich absorption isotherm. Thermodynamic parameters have been calculated. Protective film has been analysed by SEM, EDX, AFM and FTIR. Mild steel in the metal mostly employed in these studies.
KEY WORDS :corrosion inhibitors, flower extract, green inhibitors, colored inhibitors.