Electrodeposition of silane/reduced graphene oxide nanocomposite on AA2024-T3 alloy with enhanced corrosion protection, chemical and mechanical stability

Novel Phosphate Conversion Coating with Superior Corrosion Resistance on the Mg-Al-RE Alloy Based on the Introduction of Silane

“…These findings suggested that hydrolyzed APTES played a part in the formation of the coating, which was supported by the discovery of a strong Si peak. Previous studies − indicated that the Si 2p spectrum contains four distinct types of Si bonds located at approximately 101.8, 102.2, 103.2, and 104.4 eV (Figure c), which were assigned to the Si-O-Mn, Si-O-Mg, Si-O-Si, and Si-C groups, respectively. Additionally, after fitting the peak of O 1s depicted in Figure d, four components were discovered at 531.6 eV (P–O), 531.8 eV (C–O), 532.7 eV (Si–O), and 533.8 eV (Mg-O-Si/Mn-O-Si). − Notably, the peak of the oxygen of metal oxide, which generally appears at ∼530 eV, was not detected, indicating the presence of metal oxides in the coating.…”

“…Previous studies − indicated that the Si 2p spectrum contains four distinct types of Si bonds located at approximately 101.8, 102.2, 103.2, and 104.4 eV (Figure c), which were assigned to the Si-O-Mn, Si-O-Mg, Si-O-Si, and Si-C groups, respectively. Additionally, after fitting the peak of O 1s depicted in Figure d, four components were discovered at 531.6 eV (P–O), 531.8 eV (C–O), 532.7 eV (Si–O), and 533.8 eV (Mg-O-Si/Mn-O-Si). − Notably, the peak of the oxygen of metal oxide, which generally appears at ∼530 eV, was not detected, indicating the presence of metal oxides in the coating. The P 2p peak was curve-fitted to two components at 133.5 and 135.1 eV, as shown in Figure e, corresponding to HPO 4 2– and PO 4 3– , respectively. , The primary and secondary peaks correspond to the Mn 2p 3/2 (642.1 eV) and Mn 2p 1/2 (652.9 eV) spin–orbit energy levels seen in the spectrum (Figure f).…”

Complex films formed on Al alloy surface via vapor phase assembly of benzotriazole and dodecyltrimethoxysilane

“…The high volatility greatly affects VCIs’ efficiency. It is also the basis for forming the protective film via the VPA process (Zhang et al , 2022b). From supplementary material appendix (Figure S1), DTMS has a lower mass-loss rate compared to BTA.…”

Inhibition performance of halogen-substituted benzaldehyde thiosemicarbazones as corrosion inhibitors for mild steel in hydrochloric acid solution

“…The fitted electrochemical impedance parameters are summarized in Table 4 . The polarization resistance R P and inhibition efficiency η EIS from EIS measurements are calculated as follows: 44 R P = R ct + R f where R 0 P and R inhi P are the polarization resistance in the absence and presence of different concentrations of benzaldehyde thiosemicarbazone derivatives, respectively. The results in Table 4 indicate that both R f and R ct values increase with increasing inhibitor concentrations and the values of CPE dl show the opposite variation trend, suggesting the successful adsorption of benzaldehyde thiosemicarbazone derivatives on mild steel surface and the previously adsorbed water molecules were substituted by the inhibitor molecules.…”