Journal
METALS
Volume 12, Issue 12, Pages -Publisher
MDPI
DOI: 10.3390/met12122156
Keywords
concentrated solar power (CSP); thermal energy storage (TES); molten salts; duplex stainless steel; oxide scales; high-temperature corrosion
Funding
- Direccio General d'Industria
- ACCIO(Generalitat de Catalunya) [ACE034/21/000031]
Ask authors/readers for more resources
This study evaluated the compatibility of two different duplex stainless steels with a molten salt mixture at high temperatures. The results showed that DS2507 exhibited better corrosion resistance than DS2205, with thinner and more compact oxide layers that adhered better to the metallic substrate.
Next generation concentrated solar power (CSP) plants promise a higher operating temperature and better efficiency. However, new issues related to the corrosion against protection of the construction alloys need to be solved. In this work, two different duplex stainless steels grades, namely 2205 (DS2205) and 2507 (DS2507), were evaluated for their compatibility with the eutectic molten salt mixture of Li2CO3-K2CO3-Na2CO3 at 500 degrees C in air for thermal energy storage applications. Corrosion tests combined with complementary microscopy, microanalysis and mechanical techniques were employed to study the oxide scales formed on the surface of the duplex steels. The corrosion tests evidenced that the attack morphology in both duplex steels was a uniform oxidative process without localized corrosion. DS2507 presented a better corrosion resistance than DS2205, due to the formation of thinner, compact and continuous oxide layers with higher compositional content in Cr, Ni and Mo than DS2205. The oxide scales of DS2507 showed more remarkable mechanical integrity and adhesion to the metallic substrate.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available