Abstract
Recently, countries from around the globe have been actively developing a new solar power system, namely, the floating photovoltaic (FPV) system. FPV is advantageous in terms of efficiency and cost effectiveness; however, environmental conditions on the surface of water are harsher than on the ground, and the regulations and standards for the long-term durability of supporting devices are insufficient. As a result, this study aims to investigate the durability of supporting devices through a novel type of accelerated corrosion test, copper-accelerated acetic acid salt spray (CASS). After an eight-day CASS test, the results demonstrated that only a small area of white protective layer on the SUPERDYMA shape steel was fully corroded and rusted. Moreover, five types of screw, fastened solidly on the SUPERDYMA shape steel, namely a galvanized steel screw capped with a type 316 stainless steel (SS) nut, a type 304 SS screw, a type 410 SS screw, a chromate-passivated galvanized steel screw, and a XP zinc–tin alloy coated steel screw, achieved varying degrees of rust. In general, the corrosion degree of the eight-day CASS test was more serious than that of the 136-day neutral salt spray (NSS) test. Therefore, the CASS test is faster and more efficient for the evaluation of the durability of supporting devices.
Highlights
Published: 7 April 2021Over recent years, the market of photovoltaic systems has been expanding rapidly
SUPERDYMA shape steel is a Zn-Al-Mg-Si coated steel from Nippon Steel and Sumitomo Metal in Japan, with a coating composition consisting of zinc as the main substrate in combination with aluminum, magnesium, and a trace amount of silicon
Shape steel K27 was selected as the substrate on which the screws were fastened in this study
Summary
Published: 7 April 2021Over recent years, the market of photovoltaic systems has been expanding rapidly. In addition to common types of rooftop, ground-mounted, and building-integrated photovoltaic systems, countries from around the world have been actively developing a floating photovoltaic (FPV) system, which is mainly installed on surface of idle waters [1,2]. The. FPV system is highly suitable for countries that are densely populated and are highly dependent on imported energy, and it is expected to solve the development dilemma of insufficient land resources [3,4]. The common materials of supporting devices are hotdipped galvanized steel or aluminum. Concrete piles are generally used in fixed systems and are piled into the ground directly under water. The materials used in floating systems are mainly engineering plastics, most of which are high density polyethylene (HDPE) [5]
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