Corrosion by concentrated sulfuric acid: variation of weight loss per unit areas as a function of time for ferrous alloys

Abstract:

One of the great problems faced in the production of concentrated sulfuric acid is storage and transportation because this acid is very aggressive. Carbon steel austenitic stainless are the most commonly used alloys. When these alloys come into contact with concentrated sulfuric acid, there is an immediate acid attack with the formation of a protective layer on the metallic surface. Corrosion rate mean values of these alloys in concentrated sulfuric acid can be found in the literature; however, data on the variation of the corrosion rates as a function of immersion time are rare. This type of study is important because it allows estimating the time of formation of the protective layer. This paper aims at presenting curves of variation of weight loss per unit area as a function of immersion time obtained for two carbon steels and an austenitic stainless in concentrated sulfuric acid (93.5%, 96% and 98%) at 25°C and 33°C. Results for a high corrosion resistant alloy are also presented.


Reference:
PANOSSIAN, Zehbour; PIMENTA, Gutemberg de S.; SILVA, Claudete de; SILVA, Carlos Alesandre Martins da ; SANTOS, Mariliza ; RUFINO, Carlos Henrique; ARAÚJO, Marcelo . Corrosion by concentrated sulfuric acid : variation of weight loss per unit areas as a function of time for ferrous alloys. In: NACE INTERNATIONAL CONFERENCE, 2012, Salt Lake, Utah. Proceedings… 15 p.

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