Comparative anti-corrosion properties of alkylthiols SAMs and mercapto functional silica sol–gel coatings on copper surface in sodium chloride solution

Abstract

In this paper, we tried to fabricate a compact and thick mercapto functional silica sol-gel coating to achieve excellent corrosion resistance performance on copper. A detailed comparative study of alkylthiol self-assembled monolayers (SAMs) and mercapto functional silica sol-gel coating prepared by 1-octanethiol, n-dodecanethiol and (3-mercaptopropyl)trimethoxysilane (MPTMS) was carried out. The elements composition and chemical bonding of the protective coatings were characterized by X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy. In addition, the cross section morphologies of Cu-MPTMS sol-gel coating were investigated by field emission scanning electron microscopy. The wettability of various coatings was investigated by contact angle measurement instrument. Finally, the anti-corrosion ability of the coatings was characterized using an electrochemical workstation. Results demonstrated that compared to other alkylthiol SAMs, the Cu-MPTMS sol-gel coating showed the best anti-corrosion property in sodium chloride solution because it owned a multiple hierarchic Si-O-Si network structure, thus to achieve a higher range of thickness and lengthen the diffusion path way of corrosive medium. It was also found that compact and thick mercapto functional silica sol-gel coating shows better corrosion resistance performance than other SAMs of the same type.

Corrosion Protection Evaluation of Copper Coated with a Block Copolymer and Block Coploymer/Carbon Black Nanoparticles in 3 wt% NaCl Solution

“…From the data in Table 6 and Table 7, it is apparent that the parameters extrapolated for the bare copper are in agreement with already published literature. [23,48,52] Moreover, compared to the parameters of Cu-SEBS and Cu-SEBS-CB, we can see that the bare copper owned the lowest value of R f and R ct , highlighting the protective effect of SEBS and SEBS-CB coated copper electrodes. Not just that, but it also is clear that R ct increases with the increasing SEBS ratio.…”

X-ray Photoelectron Spectroscopy as a tool to investigate silane-based coatings for the protection of outdoor bronze: The role of alloying elements

“…5d. lt is well known that the partial oxidation of the thiol groups can occur in the presence of oxygen gas contamination (31,32] and it is catal ysed by the presence of multiple-valence cations (like Cu and Sn ions), among which copper ions show high catalytic effects (31 ]. This justifies the presence of oxidized species on coated Cu, but not on coated ZrN, as from zirconium element only zirconium (IV) cations can be formed.…”

Olefin-Bridged Bidentate Adsorbates for Generating Self-Assembled Monolayers on Gold

“…To evaluate the conformational order of the SAMs, the OBC15SH SAMs equilibrated in various solvents were analyzed using PM-IRRAS. The position of the antisymmetric C–H stretch of the methylene (ν as CH 2 ) can be used to judge the conformational order of the hydrocarbon chains; for example, a conformationally ordered alkyl chain in the trans-extended conformation exhibits a ν as CH 2 peak at 2918 cm –1 , , and deviations to higher wavenumbers indicate the presence of conformationally disordered chains. − ,, The PM-IRRAS spectra of the C–H stretching region for the OBC15SH SAMs are shown in Figure , and the ν as CH 2 peak positions are given in Table . SAMs derived from the analogous n -alkanethiol, C15SH , were used as a reference to compare and contrast the conformational order of the OBC15SH SAMs.…”