CIESC Journal ›› 2020, Vol. 71 ›› Issue (10): 4750-4759.doi: 10.11949/0438-1157.20200591

• Surface and interface engineering • Previous Articles     Next Articles

Preparation and characterization of durable superhydrophobic protective coatings on aluminum alloy

Lei LIU(),Yue ZHANG,Xia LI,Jinglei LEI,Lingjie LI()   

  1. School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China
  • Received:2020-05-15 Revised:2020-05-27 Online:2020-10-05 Published:2020-06-12
  • Contact: Lingjie LI E-mail:291649902@163.com;ljli@cqu.edu.cn

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Abstract:

The durable superhydrophobic protective coatings on the 7B04 aluminum alloy surface was prepared by using acid etching and boiling water bath to construct micro-nano hierarchical structure, and then spraying suspension containing aluminum phosphate adhesive (AP) and perfluorooctyltrichlorosilane (PFOTS) to increase adhesion and reduce surface energy. The samples were characterized by field emission scanning electron microscopy (FESEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), contact angle measurement (CA), electrochemical impedance spectroscopy(EIS) and a variety of the environmental simulation experiments. The results showed that the static water contact angle (WCA) of the surface is 158.4° and the slide angle (SA) is about 0°, suggesting superhydrophobicity and low adhesion to water. The coating resistance (Rc) was as high as 101.55 kΩ· cm2 and the charge transfer resistance (Rt) in NaCl corrosion medium increased by nearly two orders of magnitude, showing excellent protective performance. The sample can withstand a variety of damages, with ideal mechanical durability, chemical durability and environmental durability.

Key words: aluminum alloy, surface wettability, corrosion, protection, electrochemistry, durability

CLC Number: 

  • TG 174.4

Fig.1

FESEM images of different sample surfaces"

Fig.2

XPS spectra of sample surface after acid etching and boiling water bath"

Fig.3

XPS spectra of superhydrophobic protective coating surface"

Fig.4

FTIR spectra of different samples"

Fig.5

Wettability results of different sample surfaces"

Fig.6

EIS Nyquist diagrams and equivalent circuits for different samples"

Table 1

Electrochemical parameters derived from EIS Nyquist diagrams shown in Fig.6(a)"

SampleRs/(Ω·cm2)Rc/(kΩ·cm2)Cc/(μF·cm-2)Rt/(kΩ·cm2)Cdl/(μF·cm-2)
untreated 7B04Al8.96——2.149.28
superhydrophobic 7B04Al8.79101.550.45150.989.26

Fig.7

Water contact angle changes of superhydrophobic protective coating after various mechanical damages"

Fig.8

Water contact angle changes of superhydrophobic protective coating after various chemical damages"

Fig.9

Water contact angle changes of superhydrophobic protective coating with storage time"

Fig.10

Formation mechanism of superhydrophobic protective coating"

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