Effect of Austenizing and Tempering Time on Corrosion Rate of Austenitic Stainless Steel in Oxalic Acid

Abstract:

The aim of this work is to study the effect of austenizing time, tempering process and tempering time on corrosion rate of austenitic stainless steel in oxalic acid. The samples of typical 304 stainless steel were heated to 1050°C for 10, 20 and 30 minutes and quenched to room temperature in water, then tempered at 250°C, 400°C and 600°C for 30, 60 minutes for each tempering time. These samples were then immersed in 0.1M of oxalic acid and then their weight losses were measured after 30 days. The result obtained show that corrosion rate of all austenitic stainless steel samples decreased with an increase austenizing time, this behaviour is due to more homogenously of austenite, and the corrosion rate will be increased with increase the tempering temperature and tempering time, this behaviour is due different phases at microstructure below 400°C, and above of 400 to 600°C the corrosion rate will be increased due to formation of carbides which are non-uniform distributed at the grain boundaries and causes intergranular corrosion.

• Periodical: Advanced Materials Research (Volume 980)
• Pages: 46-51
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.980.46
• Online since: June 2014
• Authors: Mohamed A. Gebril*, M.S. Aldlemey, Farag Haider, Naji Ali
• Keywords: Austenitic Stainless Steel, Austenizing Time, Corrosion Rate, Oxalic Acid, Tempering

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