Improving mild steel corrosion resistance in tap water: influence of water flow and supply rates
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Дата
2021
Автори
Науковий керівник
Назва журналу
Номер ISSN
Назва тому
Видавець
КПІ ім. Ігоря Сікорського; ТОВ «Українська водна спілка»
Анотація
The mild steel corrosion has been studied in hot tap water (50 C) using linear polarization
technique in the laboratory set-up that models water circulating system. The influence of water flow
rate (0.15-0.45 m/s) and water supply rate (0-70 % of system volume per hour) on corrosion
kinetics have been investigated. The corrosion products, formed on the surface of the steel
corrosion probes, have been analysed with X-Ray Diffraction (XRD). It has been found, that in
condition of low water flow rate (0.15 m/s) and in the absence of water supply the corrosion rate is
high (0.29 mm/year) due to low blocking abilities of the surface deposits. Amorphous Fe(OH)3 is
the main corrosion product to be detected on the surface. The increase in water flow rate above
0.15 m/s and water supply rate above 30 % of system volume per hour leads to the 1.6 times
corrosion rate reduction (to 0.18 mm/year) due to the formation of dense surface layer of calcium
carbonate and iron oxyhydroxides. The results obtained can be utilized to improve the corrosion
performance of hot water supply systems.
Опис
Ключові слова
corrosion rate, flow rate, mild steel, polarization resistance, tap water, швидкість корозії, витрата води, маловуглецева сталь, поляризаційний опір, водопровідна вода
Бібліографічний опис
Vasyliev, G. Improving mild steel corrosion resistance in tap water: influence of water flow and supply rates / G. Vasyliev // Вода і водоочисні технології. Науково-технічні вісті. – 2021. – № 2(30). – С. 51-58.