Electrochemical Analysis on Intergranular Corrosion of Austenitic Stainless Steel Weld in Molten Nitrate Salt

Autor:	Noparat Kanjanaprayut, Thamrongsin Siripongsakul, Panya Wiman, Wannapha Issaard, Thanasak Nilsonthi, Piyorose Promdirek
Jazyk:	angličtina
Rok vydání:	2024
Předmět:	intergranular corrosion austenitic stainless steel weld linear sweep voltammetry delta ferrite sigma phase Mining engineering. Metallurgy TN1-997
Zdroj:	Metals, Vol 14, Iss 11, p 1284 (2024)
Druh dokumentu:	article
ISSN:	14111284 2075-4701
DOI:	10.3390/met14111284
Popis:	An investigation of intergranular corrosion (IGC) sensitization in molten nitrate salts of austenitic stainless steel welds of AISI 304, AISI 304H, and AISI321 produced by GTAW with ER 308L and ER 347 fillers was performed. The degree of sensitization (DOS) to IGC was assessed using a double loop electrochemical potentiokinetic reactivation and pitting potential. It was found that DOS levels in weld zones were quite low, not exceeding 15%, while those in HAZs were up to 60% after exposure at 600 °C for 300 h. The low DOS levels were due to low carbide precipitation. However, another cause of DOS was the delta-ferrite to sigma transformation in weld zones. Linear sweep voltammetry was used to quantify the sigma phase.
Databáze:	Directory of Open Access Journals
Externí odkaz:	https://doaj.org/article/9d9784dee0d046c78bad3dc3c67f2288 Zobrazit plný text záznamu View record in DOAJ