Effect of chain length on the anticorrosion property of bis[3‐(triethoxysilyl)propyl]tetrasulfide/trimethoxysilane dual‐component silane film on the AZ31B Mg alloy surface

Abstract

In this paper, the dual-component silane films composed of trimethoxysilane and bis [3-(triethoxysilyl)propyl]tetrasulfide (BTESPT) were prepared on the surface of AZ31B Mg alloys. The selected trimethoxysilanes had different chain length. The results showed that the dual-component silane films could effectively enhance the corrosion resistance of Mg alloys. Moreover, with the enlarging of the chain length of trimethoxysilane, the hydrophobic property and the corrosion resistance of the dual-component silane films were enhanced. And the dual-component silane film composed of BTESPT and octadecyltrimethoxysilane (OTMS) showed the highest contact angle and the best corrosion resistance. It could be ascribed to the high density of CH 2 groups and -S-S-S-Sin the dual-component silane film, greatly improving the hydrophobicity and the anticorrosion property. Simultaneously, the substantial Si-O-Si network in the dual-component silane film also enlarged the length of the penetration paths for corrosive media, delaying the corrosion of the Mg alloy.

Phytic acid pretreatment activate hot-dip galvanized steel to enhance the corrosion resistance of silane film

“…R c reflects the barrier relationship between electrolyte and metal. The larger R c indicates the strong barrier effect of the coating; R ct is an inductive impedance parallel to the double layer, which responds to the greater the R ct , the more difficult the charge transfer process, that is, the slower the corrosion process [34]. According to results in figures 9(a), (b), it can be seen that R c and R ct of the PA/GT hybrid film were higher than those of the GT film, displaying that the barrier effect of the coating was enhanced after the PA treatment, and the PA5/GT film always display the highest R c and R ct with values 2 or 3 times higher than those of the GT film, exhibits PA treatment could effectively increase the denseness and thickness of the GT film when the concentration was 5 ml l −1 , thus improving the corrosion impedance.…”

Fabrication of Ti3C2Tx‐Based Superhydrophobic Composite Coating for Reinforcement Corrosion Resistance of AZ31B Mg Alloy

“…The superhydrophobic surfaces with unique water-repellent, antimicrobial, and antifouling performances have gained tremendous attention in anticorrosion field. [14][15][16][17] The micro-nanoscale structures of superhydrophobic coatings could entrap large amounts of air pockets to form an air film at the coating-corrosive solution interface, which could effectively reduce the contact of the metal substrate with aggressive solution and significantly depress the permeation of corrosive species. [18][19][20] So that a superhydrophobic coating would be an effective and simple way for sealing method that improves corrosion resistance of Mg alloy.…”