Latest ArticlesThe surface corrosion rate of superhydrophobic coating during chemical corrosion was evaluated by using mass change representation method, and a modified superhydrophobic coating by adding fluorine-containing compound to the final coating was proposed. Under room temperature, acid, alkali, and salt corrosion resistance experiments were conducted on glass substrates coated with fluorine-containing superhydrophobic coatings, fluorine-free superhydrophobic coatings, and RTV coatings, respectively, and different corrosion time and corrosive medium concentration were set. The results show that the acid and salt resistance of superhydrophobic coating is stronger than the alkali resistance. The addition of fluorine-containing compounds can significantly improve the chemical resistance of superhydrophobic coating. The acid and alkali resistance of the fluorine-containing superhydrophobic coatings is similar to that of the RTV coatings, but its salt corrosion resistance is significantly better than that of the RTV coatings.
The influence of the geometric size and complex capacitance measurement error on the dielectric spectrum measurement errors of contact and non-contact methods was theoretically analyzed, and the two errors were compared. The influence of electrode gap distance and dielectric constant of sample on the dielectric spectrum measurement errors was simulated and analyzed. On the basis of dielectric spectra of high temperature vulcanized silicone rubber obtained by dielectric spectrometer, the influence of measurement errors of the geometric size (sample thickness) on the accuracy of measurement results for contact and non-contact methods was analyzed. The results show that the non-contact method is much more affected by the measurement accuracy of the geometric size and complex capacitance than the contact method, and it has high requirement on the instrument accuracy and is easier to produce significant errors than the contact method. With the increase of relative dielectric constant of the sample, the measurement error of relative dielectric constant by non-contact method dramatically increases and then gradually becomes stable. When the relative dielectric constant of the sample is no more than 5, with the increase of electrode gap distance, the measurement error of the relative dielectric constant dramatically increases. The non-contact method is suitable for the occasion with high measurement accuracy of the geometric size and dielectric constant.
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