Preparation and Physicochemical Characterization of Natural Phosphate and Kaolin Coatings in Stainless Steel

 

R. Najih,¹ A. Chtaini^2,* and H. Oulfajrite²

¹ Laboratoire Valorisation et Sécurité des Produits Agro-Alimentaires, Faculté des Sciences et Techniques de Beni Mellal, Maroc

² Equipe d’Electrochimie Moléculaire et Matériaux Inorganiques, Faculté des Sciences et Techniques de Beni Mellal, Maroc

 

DOI: 10.4152/pea.201101039

 

Abstract

The inhibition efficiency of natural phosphate and kaolin systems in controlling corrosion of stainless steel in HClO₄ (0.1 M) solution has been evaluated by electrochemical polarization methods, and electrochemical impedance spectroscopy. The electrochemical data show that the corrosion resistance is greatly enhanced after surface modification. The best protection is obtained with natural phosphate. The uniform coatings of phosphate and kaolin on iron substrates were obtained by electro deposition.

Keywords: electrodeposition; natural phosphate; kaolin; impedance; polarization; stainless steel.

 

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References

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* Corresponding author. E-mail address: chtainia@yahoo.fr

Received 7 September 2010; accepted 18 December 2010