Corrosion Behavior of Ti-Si-B-C Nanocomposite Hard Coating with Different Si Contents on 4130 Steel
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TION
HIGH strength steel is dominating the future materials for several industrial components. However, it is prone to corrosion. The prevention of corrosion depends on the material to be protected, environmental condition and many other concerns. The most commonly used methods to decelerate corrosion are applying organic and metallic protective coatings. Although such coatings are appropriate for several applications, for specialized applications, particularly where erosion and corrosion protections are simultaneously required, newer coatings are needed. Recently, nanocomposites hard coatings have drawn the attention of researchers because of of their better tribologic properties, higher hardness, and high thermal and corrosion resistance compared with the conventional coatings.[1,2] Different strategies, for example, PVD, CVD and plasma spray, are being utilized to develop the nanostructured coatings to enhance the life, performance and reliability.[3,4]
APARNA SHUKLA and S. K. MISHRA are with the CSIRNational Metallurgical Laboratory, Jamshedpur 831007, India. Contact e-mails: [email protected], [email protected], [email protected] B. SIVAKUMAR is with the IIT Madras, Chennai, India. Manuscript submitted February 24, 2020.
METALLURGICAL AND MATERIALS TRANSACTIONS A
Research activities on the fabrication of nanocomposite coatings have increased, and many possible combinations of different elements are being studied.[5–9] The various aspects of mechanical properties, such as the role of phase immiscibility, interface behavior, diffusional creep and dislocation gliding, are being investigated. It has been established that the presence of nano-crystalline phases embedded in the amorphous matrix improves the hardness and toughness of the coatings. Considering the practical applications of these nano-composite coatings, it is important to understand their corrosion behavior. Studies on the corrosion behavior of these nanocomposite coatings are few, and more understanding is needed.[10,11] Titanium-based hard coatings such as TiB2, TiC, TiN, (Ti-Al)N, (Ti-B)N, Ti-Si-C-N, Ti-Si-C, TiO2 and TiO2-SiO2 have shown a tribologic behavior in complex operating conditions.[10–19] Matthes et al. deposited TiB2, (Ti,Al)N, (Ti,B)N and TiN hard coatings with varying thicknesses by different processes. Among them, TiB2 showed the highest corrosion current density and TiN the lowest, whereas (Ti,Al)N and (Ti,B)N corrosion current densities were found to be in between.[12] The electrochemical oxidation of TiB2 film showed that the corrosion resistance of amorphous TiB2 films was approximately 4000 times better than that of bulk powder material and eight to ten times better than the amorphous crystalline films.[13] The corrosion results revealed that the TiB2 coatings underwent different
chemical specifies, such as TiO2+, Ti3+, TiO2 and BO3, during the polarization, which protected the surface. Similarly, Madaoui et al. reported that magnetron-sputtered TiCN coatings on XC48 steel substrate exhibited higher hardness and corrosion resist
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