Reducing the degree of sensitization of AISI 304 stainless steel with ceramics heat insulating paste

Abstract

Investigates the influence of ceramics heat insulating paste on the degree of sensitization of AISI 304 stainless steel using double‐loop electrochemical potentiokinetic reactivation technique. Steel samples with and without protection by ceramics heat insulating paste were heat treated at 700°C for 15, 30 and 60 minutes. Double‐loop electrochemical potentiokinetic reactivation (DL‐EPR) tests were conducted for the as‐received and heat‐treated samples in 0.5M H₂SO₄ + 0.01M KSCN solutions. Measurements of the ratios of the reactivation current to the anodic current indicated that the ceramics heat insulating paste effectively prevented sensitization of the steel for the first 15 minutes at 700°C and reduced the degree of sensitization for samples heat treated for 30 and 60 minutes. Concludes that the decreased degree of protection by the ceramics heat insulating paste was due to the dehydration and subsequent cracking of the paste.

Citation

Qiu, J.H. (1997), "Reducing the degree of sensitization of AISI 304 stainless steel with ceramics heat insulating paste", Anti-Corrosion Methods and Materials, Vol. 44 No. 1, pp. 10-12. https://doi.org/10.1108/00035599710157404