| The Metallographic Study of Corrosion of Metals
with Latent Heat Storage Materials Suitable for
Solar Hot Water System |
D. Jaya Krishna1,* and Sharabh Kochar2
Pages : 133-144
DOI : 10.1080/0371750X.2017.1268072
|
| Abstract |
| In the present study three most commonly considered metals in thermal equipment
such as copper, aluminium and stainless steel have been considered to study the
corrosion rate with latent heat storage materials suitable for solar hot water system.
The latent heat storage materials (LHSMs) considered are paraffin wax, myristic acid,
stearic acid, palmatic acid, lauric acid and sodium acetate trihydrate. The compatibility
of these metals with selected LHSMs is evaluated by immersion corrosion test on a
short term basis.The experiment is performed at 70oC to make sure it is above the melting
points of selected LHSMs. During the experiment, it is made sure that the metal specimen
is totally immersed in the LHSM to avoid contact with air, thereby creating a more practical
and realistic situation of thermal energy storage system. The corrosion rate is measured
for a span of 20 days. Results are presented in terms of corrosion rate, physical and
microscopic appearance of the metal specimens. Based on the experiments, it is
observed that several pairs can be ruled out. The study could reveal that a good amount
of metal loss can be seen on both copper and aluminium. Stainless steel is found to
be the best out of three metals (almost immune to corrosion) and can be used as a
container material for solar water heating system.
[Keywords: Thermal energy, Latent heat storage materials, Corrosion rate, Immersion
corrosion test] |
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