RESEARCH ARTICLE


A Comparative Study of Corrosive-Erosive Effects at AISI D3 Steel, 304 Stainless Steel and CrN/AlN Material



J. C. Caicedo*, 1, 2, G. Cabrera1, H. H. Caicedo3, 4, W. Aperador5
1 School of Materials, Universidad del Valle, Colombia
2 Advanced Materials for Micro and NanoTechnology Research Group, Universidad Autónoma de Occidente, Cali, Colombia
3 Department of Bioengineering
4 Department of Bioengineering, Department of Anatomy and Cell Biology, University of Illinois at Chicago, IL 60612, USA
5 Ingenieria Mecatrónica, Universidad Militar Nueva Granada, Bogotá, Colombia


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© 2012 Caicedo et al;

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the School of Materials, Universidad del Valle, Colombia; Tel.: 57+2+339 46 10, Ext. 42; Fax: 57+2+339 46, +1.312.9960402; E-mails: jcaicedoangulo@gmail.com, caicedo.hugo@gmail.com


Abstract

Corrosive-erosive effect on AISI D3 steel, 304 stainless steel and CrN/AlN coating in aqueous NaCl slurries was studied. CrN/AlN multilayer films with a thickness of 3 µm and bilayer period of Λ = 60 nm (50 bilayers) were obtained by using the physical vapor deposition (PVD) technique (magnetron sputtering). The corrosion-erosion experiments were performed in a test machine in which the impingement velocity, impact angle, concentration of solids and pH of the solution were controlled. Polarization curves were simultaneously obtained to correlate the electrochemical effects to the erosive wear mechanisms. The slurry used consists of silica particles suspended in a mixture of acid solution and 3.5% NaCl, with a pH value of 5.6. Electrochemical results showed the best corrosion resistance for 304 stainless steels. Additionally, the surface analysis by SEM micrograph revealed formation of cracks in CrN/AlN multilayers coating and plastic deformation in both steel substrates (AISI D3 steel, 304 stainless steel), especially when the mean impact angle is a critical value of 90°. Measurements of critical and passive current densities showed that the behavior of coated materials differed depending on the substrate that is used. Nonetheless, in a general way, by increasing the impact angle and by changing its incidence from normal to grazing, it led to a resistance to corrosion-erosion processes.

Keywords: Corrosion-erosion, multilayer coating, electrochemical tests, surface analysis.