Mechanical characterization of nano-reinforced silica based sol–gel hybrid coatings on AISI 316L stainless steel using nanoindentation techniques

Effect of cerium on structure modifications of a hybrid sol–gel coating, its mechanical properties and anti-corrosion behavior

“…The area function A(hc) was calibrated on fused silica and relates the contact area to the contact depth hc. Data of hardness and elastic modulus of various films [26] and coating deposited using the sol-gel route [27] from experimental data using this technique can be found in the literature. The maximal normal force was 100 mN, the loading rate is 1 mN s À1 and the penetration depth was kept under 100 nm in order to avoid substrate influence.…”

“…The maximal normal force was 100 mN, the loading rate is 1 mN s À1 and the penetration depth was kept under 100 nm in order to avoid substrate influence. Solid-state 29 Si, 13 C and 27 Al magic-angle spinning nuclear magnetic resonance (MAS/NMR) spectra were recorded for unsupported hybrid films using a VARIAN spectrometer operating at 300 MHz and 7.05 T. The Larmor frequency for 29 Si, 13 C and 27 Al were 59.59 MHz, 75.42 MHz and 78.16 MHz, respectively. The spectra were obtained from the Fourier transformation of the free induction decays (FID) following a single p/2 excitation pulse and a dead time of 2 s. Chemical shifts were referenced to tetramethylsilane (TMS), used as external standard.…”

“…Proton decoupling was always used during spectra acquisition. Because of the high sensitivity of the 29 Si, 13 C and 27 Al NMR measurements, the accuracy in the chemical shift values was of 0.2 ppm.…”

“…Anti-corrosion protection and mechanical properties of alumino-silane hybrid coating containing different cerium contents were evaluated, depending on cerium content, by electrochemical analyses (EIS) and nanoindentation. Finally, 29 Si, 13 C and 27 Al RMN analyzes were 3 , with different cerium contents, were deposited onto aluminum by dip-coating process. Corrosion resistance and mechanical properties were investigated by electrochemical impedance measurements and nano-indentation respectively.…”

The corrosion resistance of 316L stainless steel coated with a silane hybrid nanocomposite coating

“…Furthermore, the corrosion of stainless steel welds and joints occurs in the transpassive potential region in highly oxidizing environments of many industrial processes, especially in sulfuric acid media releasing Cr(VI) ions [40]. To resolve all these problems, the application of hybrid coatings has been increasingly investigated in the last years [38,[41][42][43].…”