Abstract
This study proposes coating impedance detector 3.0 (CID 3.0), an improved version of our previously developed CID 2.0. The new circuit design in CID 3.0 has lower power consumption because it has fewer components, and it affords better accuracy through the modification of the analog part of CID 2.0 and the use of oversampling. This approach successfully afforded CID 3.0 with higher measurement stability for evaluating a high-performance coating with impedance values exceeding <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$10^{9}~\Omega $ </tex-math></inline-formula> . Furthermore, CID 3.0 could detect impedance decreases associated with coating delamination when the coating suffers an attack.
Highlights
Among many corrosion prevention methods, such as sacrificial anode and impressed current cathodic protection, protective organic coatings are considered the most low-cost, direct, and effective solution for offshore wind turbines
To reduce data uncertainty and increase the measurement reliability when the examined coatings have high impedance values, as is the case with the commercial paints applied within the offshore wind energy industry, this study proposes CID 3.0, a revised version of CID 2.0
The impedance values of the seven ideal resistors as obtained using CID 3.0 were 9.78 kΩ, 99.4 kΩ, 0.992 MΩ, 9.91 MΩ, 101.18 MΩ, 1.072 GΩ, and 9.07 GΩ, respectively; these are similar to the values measured by VOM
Summary
Among many corrosion prevention methods, such as sacrificial anode and impressed current cathodic protection, protective organic coatings are considered the most low-cost, direct, and effective solution for offshore wind turbines. Such coatings, in a manner similar to those on ships and buildings, can provide a physical barrier to protect offshore wind turbines from corrosive environments. The coating health gradually deteriorates with time. Coatings cannot provide permanent protection to a substrate, and they must be periodically inspected and maintained to maximize their lifetime and ensure their function. The health of coatings applied on steel structures should be evaluated periodically to prevent corrosion failures in offshore wind towers
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