Effect of refrigerant absorbent combinations in the corrosion resistance of copper as structural material in absorption refrigeration systems (ARS)

Abstract

The present research was focused on analyzing the corrosion resistance of copper in the presence of refrigerant-absorbent combinations such as lithium bromide (LiBr), lithium nitrate (LiNO 3 ) and calcium chloride (CaCl 2 ), used in Adsorption Refrigeration Systems (ARS). Electrochemical techniques such as open circuit potential, electrochemical impedance spectroscopy, electrochemical noise analyses and potentiodynamic polarisation curves were applied to study the test solution combination effect on the corrosion rate of copper as a structural material in ARS. OCP analyses reveal that the E corr shifted based on the temperature and test solution. Meanwhile, when the copper was immersed in LiBr/H 2 O + CaCl 2 at 80°C, the corrosion current density (I corr ) was lower (0.003 mA/cm 2 ). Also, The R p estimated from EIS shows an increase at 80°C. Micrographs of the copper surface immersed in LiBr/H 2 O and LiBr + CaCl 2 observed cracks and pits. But also, when the corrosion product layer was removed, a less heterogeneous surface was revealed.

Corrosion Behavior of Carbon Steel in LiCl/H2O Mixtures

“…In another research work, 316L-type stainless steel was evaluated by When [25] in KCOOH and LiCl-H 2 O, and a lower dissolution rate in KCOOH was found as compared with that in LiCl-H 2 O. In our research, we have evaluated the corrosion behavior of different metals in the CaCl 2 -LiBr-LiNO 3 -H 2 O system instead of LiBr/H 2 O working fluid, finding a significant reduction in the corrosion rates of the different tested alloys [26][27][28]. In some research works [29,30], it has been shown that the LiCl-H 2 O cooling fluids have better thermophysical properties than LiBr-H 2 O.…”