The study of inhibiting structural material corrosion in water recycling systems by sodium hydroxide
| Autor: | Oksana Myrgorod, Nataliya Miroshnichenko, Hanna Pancheva, Alexei Pilipenko, Anna Reznichenko, Alexander Sincheskul |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Carbon steel Energy Engineering and Power Technology 02 engineering and technology engineering.material Electrochemistry Industrial and Manufacturing Engineering Corrosion chemistry.chemical_compound 0203 mechanical engineering circulating water Management of Technology and Innovation mineralization Electrical and Electronic Engineering Polarization (electrochemistry) corrosion sodium hydroxide Applied Mathematics Mechanical Engineering Metallurgy carbon steel 021001 nanoscience & nanotechnology Computer Science Applications grey cast iron 020303 mechanical engineering & transports chemistry Distilled water Control and Systems Engineering Sodium hydroxide engineering Cast iron Cyclic voltammetry 0210 nano-technology |
| Zdroj: | Eastern-European Journal of Enterprise Technologies. 2:21-28 |
| ISSN: | 1729-4061 1729-3774 |
| DOI: | 10.15587/1729-4061.2017.95989 |
| Popis: | Influence of sodium hydroxide on the rate and nature of corrosion of St3 carbon steel and SCh 18-36 grey cast iron in highly mineralized recycling water was studied. The nature of the corrosion damage was determined and the weight index of corrosion of these alloys was calculated. By means of polarization measurements, the electrochemical indices of anodic processes on steel and cast iron were determined. The effect of the circulating water pH on behavior of steel and cast iron under anodic polarization has been studied by cyclic voltammetry. It has been shown that the effective impact of pH on characteristics of the anode processes occured at pH≥11.4. At these pH values, the metal steady-state potential shifted to a region of positive values which was an indication of inhibition of the anodic process itself. At pH≥11.4, the pitting potential significantly shifted to the positive side: the process of healing pits was faster than their formation. It has been established that steel and especially cast iron tend to pass into a passive state at pH> 10. The corrosion rate values did not exceed this index for the studied alloys in distilled water and were in the range of acceptable values. Thus, it is possible to effectively inhibit the rate of steel and cast iron corrosion, especially in the waterline zone by shifting the pH of the circulating water to the alkaline region. As a result of the conducted studies, optimal working conditions for iron alloys as the most technically important structural materials for designing closed cycles of circulating water supply systems have been established. |
| Databáze: | OpenAIRE |
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