Abstract
Conventional absorption and refrigeration systems use a LiBr/H2O mixture, which causes corrosion problems to the metallic components. In order to avoid this and some other problems such as crystallization and vapor pressure, some additives such as CaCl2 and/or LiNO3 are added to the LiBr/H2O mixture. In the present work, the corrosion behavior of 1018 carbon steel as well as of type 304 and 316L stainless steels was evaluated in LiBr/H2O at 80 °C with the addition of CaCl2, LiNO3, and CaCl2+LiNO3. Potentiodynamic polarization curves and electrochemical impedance spectroscopy were used for this purpose. The results showed that the corrosion current density values of all tested steels decreased with the addition of CaCl2 and/or LiNO3, which induced the formation of a passive film on carbon steel. Both types of stainless steels showed a passive film in all tested conditions, but the passive current density was the lowest, whereas the passive zone was the widest, for 316L steel. The corrosion mechanism remained unaltered for both stainless steels but was changed with the addition of CaCl2 and/or LiNO3 for carbon steel.
Highlights
Absorption refrigeration systems are compression refrigeration systems that use thermal compressors [1,2,3]
Li [16] used the ternary mixture CaCl2–LiBr–LiNO3 for an absorption system based on one step that uses solar energy, whereas Li [17] carried out a study by using the CaCl2–LiNO3–KNO3/H2O quaternary system
Due to its low cost, carbon steel was widely used in these systems, but it suffers from severe corrosion problems in a LiBr solution
Summary
Absorption refrigeration systems are compression refrigeration systems that use thermal compressors [1,2,3]. Carbon steel is widely used as a structural metallic component in absorption cooling systems due to its low cost, it suffers from severe corrosion problems, which makes it necessary to evaluate some other more corrosion-resistant ferrous alloys such as austenitic type 304 and 316L stainless steels, they are susceptible to localized corrosion. For this purpose, commercial cylindrical bars, 6 mm in diameter, were obtained. They were abraded with 600–4000-grade emery paper, washed, and cleaned with acetone
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