Corrosion behavior of Cr3C2–NiCr vacuum plasma sprayed coatings

Characterisation and Corrosion-Erosion Behaviour of Carbide based Thermal Spray Coatings

“…However the ductility of the NiCr matrix phase significantly increased for both coatings at 800 0 C, but the erosion rate of heat treated samples increased due to the increasing constraint imposed upon the matrix by the developing carbide microstructure. Suarez M et al [50] investigated the corrosion resistance of, as coated and post treated Cr 3 C 2 -NiCr coating of 450 μm thickness, deposited by a vacuum plasma spray process (VPS) on a steel substrate. The post-heat treatment of coating was done by heating as-deposited coating in Ar at 400 °C and 800 °C, respectively.…”

Electrochemical investigation of chromium nanocarbide coated Ti–6Al–4V and Co–Cr–Mo alloy substrates

“…In another study, the influence of postdeposition heat treatment on the corrosion behavior of 450 µm thick Cr 3 C 2 -NiCr coating vacuum plasma sprayed on steel was evaluated. Significant improvement in the corrosion resistance of post-heat treated coating was attributed to the microstructural changes that decreased the interconnected porosity and increased the adhesion of the coating to the substrate [33].…”

Cr2C3–NiCr VPS thermal spray coatings as candidate for chromium replacement

“…On the other hand, it is worth mentioning that from the corrosion point of view, it has been shown [18] that during experiments using electrochemical polarization techniques, carried out on the VPS coatings heat treated at 900°C, the corrosion current density values, i corr , are nearly 4 times smaller as compared to the i corr values determined for the coating in the as-received condition, as a consequence of the metallurgical bond established at the coating-substrate interface. Nevertheless, as it was indicated in a previous research [18], the fact that a high difference of the potential electrode values exists between the carbides particles and the Ni matrix, the coated system will never reach passivity in a 3.5% sodium chloride aqueous solutions, since the corrosion potential, E corr , had high negative values of − 419.4 mV, despite the substantial reduction of the passage of corrosive solution towards the substrate/coating interface.…”

“…Despite chromium carbide's excellent wear-and corrosion-resistant properties, it is not used as primary carbide in industry owing to its lower hardness in comparison to other carbides (such as tungsten carbide). Therefore, several attempts have been made to improve the hardness, wear property and corrosion of chromium carbide coatings by varying the coating techniques, processing parameters, characteristics of the feedstock powder [12][13][14][15][16] and the post heat treatments [17][18][19][20][21][22].…”