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2018, vol. 59, iss. 1, pp. 92-99
Formation and growth of pits on X5CrNi18-10 austenitic stainless steel in presence of chlorides and sulphates
aUniversity of Belgrade, Institute of Chemistry, Technology and Metallurgy - IChTM
bUniversity of Belgrade, Faculty of Mechanical Engineering, Innovation Center
cMetalurški Institut, 'Kemal Kapetanović', Zenica, Bosna i Hercegovina

emailborejegdic@yahoo.com
Project:
Investigation and Optimization of the Technological and Functional Performance of the Ventilation Mill in the Thermal Power Plant Kostolac B (MESTD - 34028)
Development of covering and core production technology based on local raw materials for manufacturing of special coated electrodes designed for steel arc welding (MESTD - 34016)

Keywords: stainless steels; pitting corrosion; potentiodynamic polarization method; statistical analysis
Abstract
The resistance of X5CrNi18-10 stainless steel to pitting corrosion in a solution containing chlorides and sulphates was tested using the potentiodynamic polarization method. The obtained results show that the stainless steel is significantly resistant to pit formation, but it is susceptible to pit growth and crevice corrosion. Pits formed at the corrosion potential grow continuously. Statistical analysis of the results obtained during pitting corrosion testing was performed. It can be assumed with a probability of 95% that values of indicators of resistance to pit formation (the pitting potential Epit, the metastable pitting potential Empit and the difference Epit-Ekor) will be within the range of several percents. Values of indicators of resistance to pit growth (the amount of charge required for the pit growth q, the protective potential Eprot and the difference Epit-Eprot) will be within the broader range. In addition, the appearance of pits on the surface of the stainless steel, as well as the appearance of the pits bottom, were analyzed. It was shown that the structure of the stainless steel tested was not sensitized to pitting and intergranular corrosion, which means that the stainless steel was not previously thermally treated.
References
*** Standard test method for conducting cyclic potentiodynamic polarization measurements for localized corrosion susceptibility of Iron-, Nickel-, or Cobalt-Based Alloys - ASTM G61
*** Standard Guide for Applying Statistics to Analysis of Corrosion Data - ASTM G16
*** Standard Guide for Examination and Evaluation of Pitting Corrosion - ASTM G46
*** Methods of accelerated tests for resistance to pitting corrosion: GOST 9.912
*** Method of measuring the pitting potential for stainless steels by potentiodynamic control in sodium chloride solution: ISO 15158
*** Standard test method for conducting cyclic potentiodynamic polarization measurements to determine the corrosion susceptibility of small implant devices - ASTM F2129
*** Electrochemical potentiokinetic reactivation measurement using the double loop method (based on Čihal’s method): ISO 12732
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