34 , 35 Under a low frequency, with prolonging the etching time, the Z modulus of the coating shows an increasing trend and Bode phase angles in the Bode diagram peak also show a similar trend. 36 Figure 13 describes the electrochemical corrosion behaviors of the as-sprayed Al coating, the Al coating etched with NaOH solution for 7 min, the as-sprayed Al coating modified by FAS-17, and the superhydrophobic Al coating.
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