The influence of inhibitor Na2CrO4 and NaNO3 on corrosion and micro structure on AISI 348 steel material

Samosir, Rahmad and Budiarto, and Simanjuntak, Sutan LMH (2017) The influence of inhibitor Na2CrO4 and NaNO3 on corrosion and micro structure on AISI 348 steel material. In: 1st Nommensen International Conference on Technology and Engineering, Nommensen HKBP University, Medan Indonesia.

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Official URL: http://iopscience.iop.org

Abstract

The influence of inhibitor Na2CrO4 and NaNO3 on corrotion and microstructure on AISI 348 steel material have been carried out. A series of corrosion tests were conducted with polarization and potentiodynamic and microstructure resistance methods on AISI steel 348 for secondary cooling pipes at steam power plants. This research was carried out in demineralized water at room temperature (25°C) using Na2CrO4 and NaNO3 inhibitors whose concentration varied between 0-150 ppm for corrosion rate inhibitors. Observations of microstructures were performed using optical microscopy and SEM. The corrosion test showed that in the NaNO3 inhibitor solution, the highest corrosion rate was 0.05 mpy at 15 ppm and the lowest corrosion rate was 0.0058 mpy at 30 ppm, and the highest tail was 174.89 mV at 75 ppm and the lowest tail 103 , 04 mV at concentration 0 ppm. While in Na2CrO4 inhibitor solution obtained the highest corrosion rate 0,0606 mpy at concentration 75 ppm and lowest corrosion rate 0,0197 mpy at concentration 15 ppm, and highest tail 264 mV at concentration 30 ppm and lowest tail -128 mV at concentration 75 ppm from Inhibitor Na2CrO4. The optimum concentration of NaNO3 was 30 ppm with an efficiency of 72.1%, and the optimum concentration of Na2CrO4 was 150 ppm with an efficiency of 1.9%. The result of microstructure observation showed that on the surface of the sample was formed a protective film of oxide, and on corrosion of AISI 348 steel corrosion of well form.

Item Type: Conference or Workshop Item (Paper)
Subjects: TECHNOLOGY
Depositing User: Edi Wibowo
Date Deposited: 06 Aug 2018 05:00
Last Modified: 22 Jan 2019 09:04
URI: http://repository.uki.ac.id/id/eprint/92

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