Eng. &Tech.Journal, Vol.34,Part (A), No.5,2016 876 Estimation the Efficiency of Nano Particles Coating on Carbon Steel by Atomization Dr. Rana Afif Anaee Materials Engineering Department, University of Technology/ Baghdad Email: Dr.rana_afif@yahoo.com Dr. Ahmed M. Al- Ghaban Materials Engineering Department, University of Technology/ Baghdad Douaa A. Abdullah Materials Engineering Department, University of Technology/ Baghdad Received on:27/8/2015 & Accepted on:12/11/2015 ABSTRACT In this work, three nanoparticles were applied as coatings on carbon steel using atomization method (cold spraying) by airbrush. The coatings included nano Al 2 O 3 , nano SiC and nano ZrO 2 materials. The characterization of coated surfaces has been investigated by AFM and SEM. All these inspections indicated that the deposition of nanoparticles on carbon steel surface was uniform and homogeneous. The thickness of coated layers was calculated using gravimetric method, while the particle size and roughness were measured from the analysis of atomic force microscopy. With constant conditions of coating, nano alumina coating gave the highest thickness (6.2216 nm) due to agglomeration of these particles compared with others as illustrated in SEM images. Corrosion test was performed to estimate the corrosion resistance, protection efficiency and porosity percentage which indicated the role of nano particle coating on corrosion control. These data showed that the nano alumina was better than other coatings and gave PE 99.69%. Cyclic polarization was also estimated to show the probability of pitting corrosion. The coating with alumina gave the best data for decreasing the chance of pitting corrosion. Keywords: Carbon steel, cold spray, Nanoparticles, Coating. INTRODUCTION orrosion is the destructive attack of a metal by chemical or electrochemical reaction with its environment. Corrosion occurs in the aqueous environment because of protons and oxygen, which are readily available in nature [1,2]. When conferring corrosion control by nano materials, there are two main considerations; the first aspect is the understanding of corrosion behaviors of nanostructured materials, whether or not a nanostructured material possess is better corrosion resistant or not. The second aspect is how nano sized materials can be effectively employed in corrosion prevention strategies. Nano technological advancements are expected to improve corrosion monitoring and inspection sectors [3-6]. Nano coatings can be made by a variety of non-vacuum and vacuum based methods, such as sol– gel, electro-deposition, atomization, magnetron sputtering …etc. [7]. Corrosion resistance of a coating may be inferior with such aggregation due to the accelerated diffusion of aggressive ions along the interfaces between the incorporated particles [8]. Nanoparticles of diamond and other chemical compounds used for hard coatings (SiC, ZrO 2 and Al 2 O 3 ) are commercially available, with typical particle sizes in the range 4–300 nm. Co-deposition of ceramic nano scaled particles (ZrO 2 , Al 2 O 3 , ZnO, TiO 2 , ferrites, etc.) during electroplating and electro less plating can bring C