Journal
CORROSION SCIENCE
Volume 83, Issue -, Pages 396-408Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2014.03.012
Keywords
Stainless steel; Alloy; Metal coatings; High temperature corrosion; Oxidation
Funding
- National Key Technology Research and Development Program of the Ministry of Science and Technology of China [2011BAE12B03]
- National Natural Science Foundation of China [11372110, 51101056]
- Fundamental Research Funds for the Central Universities [12MS07]
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Isothermal corrosion of TP347H (Al), C22 alloy (A2) and laser-cladding C22 coating (A3) was evaluated by mass loss measurements in molten alkali chloride salts at 450-750 degrees C. Corrosion mechanisms were characterised by scanning electron microscopy, optical microscopy and X-ray diffraction. A3 exhibited superior corrosion resistance, followed by A2, which results from alloying elements, refined microstructure and Cr-O (CrOx), Co(Fe, Cr)(2)O-4 in the corrosion scale. Severe intergranular corrosion caused failure of Al, slight intergranular corrosion happened in A2 but none in A3. Fe-rich oxides were main products of Al while NiO of A2 and A3 with Cr2O3 and Mo-containing compositions. (C) 2014 Elsevier Ltd. All rights reserved.
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