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Published: Kem. Ind. 72 (7-8) (2023) 515–521
Paper reference number: KUI-75/2022
Paper type: Professional paper
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Corrosion Analysis of the 15Mo3 Steel Pipes in the Steam Heater of the Plomin Thermal Power Plant

Z. Veljin, V. Špada, J. Batelić and I. Pentek


This paper presents the investigation of corrosion of 15Mo3 pipe in the steam heater system of the Plomin thermal power plant. Corrosion damage led to a rupture in the system as well as delays. Therefore it was necessary to determine the type and the cause of the corrosion. Corrosion is classified according to three factors: the mechanism, the specificity of its occurrence, and the form of the corrosion attack. Power plants are explained with an emphasis on thermal power plants, along with an analysis of the sample and system in which the damage occurred. The results of the investigation of corrosion products on the pipe and the rupture itself are presented. Chemical analysis, microscopic research with light and electron microscopy, hardness tests according to Vickers, and analysis with FT-IR spectroscopy were carried out. Erosion corrosion was proven to be the cause of the failure in a specific example.

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thermal power plant, corrosion, erosion corrosion, 15Mo3 steel, SEM/EDS analysis