Construction and corrosion behaviors of a bilayer superhydrophobic film on copper substrate

Abstract

A novel bilayer superhydrophobic film was constructed on Cu substrate by a simple multi-step process. First, (3mercaptopropyl) trimethoxysilane (MPTMS) molecules were self-assembled onto the pre-etched Cu surface via covalent bonding followed by hydrolysis and condensation, then 1H, 1H, 2H, 2H-perfluorodecyltrichlorosilane (PFDTS) were grafted onto the resultant hydroxyl terminated surface via the Si-O-Si bonding. The so-prepared sample was defined as Cu-MPTMS-PFDTS. The structure and morphology of the samples were characterized by means of contact angle measurement, X-ray photoelectron spectroscopy and scanning electron microscopy. The corrosion behaviors of the films were evaluated by Tafel plot and electrochemical impedance spectroscopy on an electrochemical work station. The results indicated that the bilayer superhydrophobic film possessed better corrosion protection as compared with the control samples. The superiority of the corrosion protection was mainly ascribed to the following two aspects: the superhydrophobicity and polysiloxane micro-structures of the Cu-MPTMS-PFDTS.

A facile strategy for the fabrication of a bioinspired hydrophilic–superhydrophobic patterned surface for highly efficient fog-harvesting

“…In the XPS spectrum of CuO-PFDT, new bands at 164.1 eV and 684.9 eV were revealed, which indicates S2p and F1s respectively from PFDT 27,28. 2c and 2d present the full XPS spectra of the original CuO gauze and PFDT modified CuO gauze.…”

Stability and corrosion resistance of superhydrophobic surface on oxidized aluminum in NaCl aqueous solution

“…Compared with the researches on corrosion of SHS [7][8][9][10][11][12] , the methods to investigate the stability of SHS were much fewer. For example, Ou et al [16,17] and Xiong et al [18] proposed a humidity test and a solution immersion test to evaluate the stability and corrosion of SHS, respectively.…”

“…In recent years, superhydrophobic surfaces (SHS) [3][4][5][6] with static contact angle larger than 150° and sliding angle smaller than 10°have attracted considerable interest in alleviating corrosion for engineering materials, such as Ni, Al, Mg, and so on [7][8][9][10][11][12] . The corrosion resistance of SHS is due to the fact that the permeation of corrosive species, such as Cl -dissolved in water, to the metallic matrix can be suppressed greatly by the air pockets on the solid-liquid interface [13,14] .…”

Superhydrophobic surfaces on diverse metals based on ultrafast sequential deposition of silver and stearic acid

“…Typically, surface morphology was firstly tailored by different techniques of anodization [2,3], electrodeposition [4], laser treating [5], electrospinning [6,7], chemical vapor deposition [8], sol-gel processing [9], etc. Then, surface was passivated by low-surface-energy molecules of fluoroalkyl-silane [2,3,[10][11][12], fluoroalkyl mercaptan [4,13], poly(alkyl siloxane) [14], etc.…”