Mendeleev University of Chemical Technology of Russia, Moscow, Russia:

S. E. Zolotukhin, Cand. Eng., Associate Prof., Dept. of General Chemical Technology, e-mail: zolotukhin.s.e@muctr.ru
A. Yu. Kurbatov, Cand. Eng., Associate Prof., Dept. of Innovative Materials and Corrosion Protection, e-mail: kurbatov.a.i@muctr.ru
V. N. Grunsky, Dr. Eng., Prof., Dept. of General Chemical Technology
Yu. M. Averina, Cand. Eng., Associate Prof., Dept. of Innovative Materials and Corrosion Protection

A lot of works are devoted to the protection of technological equipment operating in aggressive environments. The production of sulfuric acid by the double contact - double absorption method dictates the most stringent requirements for the quality and durability of tanks, pipelines and other components, due to their operation in extremely harsh conditions (hot sulfuric acid). To increase the service life and reliability of equipment, austenitic steels and nickel-containing alloys are used. The issue of studying the processes of their corrosion in the assimilation of production is an extremely urgent task. As part of the work, an assessment was made of the corrosion resistance of nickel-containing steel and nickel-based alloys in relation to hot sulfuric acid under conditions simulating the process of removing the heat of absorption of sulfur trioxide by sulfuric acid. It has been proven that the additional introduction of silicon compounds into the composition of austenitic steels can significantly increase the corrosion resistance of the steel, primarily due to the formation of austenite-feritic structures. The positive effect of silicon compounds was noted for all ranges of the studied parameters. A similar effect is given by additives of copper, molybdenum and manganese. The effect of silicon addition for nickel alloys is most noticeable when using the material in the zone of high temperatures and sulfuric acid concentrations, while the overall corrosion rate for both alloys and austenitic steels was quite close, which led to the conclusion that the use of more expensive nickel-containing alloys is inappropriate. The data obtained as a result of the experiment on the corrosion rate of various materials can be used directly in production to calculate the operating time of the equipment and timely take the equipment out for repair or maintenance.
The researches were carried out using D. Mendeleev Center for collective use of scientific equipment, within the framework of the project No. 075-15-2021-688.

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