TECHICAL Series MATHEMATICS • INFORMATICS • PHYSICS Series PHILOLOGY Series ECONOMIC SCIENCES Sereies EDUCATIONAL SCIENCES Series LAW AND SOCIAL SCIENCES Series
Spectrum of Electrochemical Noise and Its Relationship with Passivation Processes of Stainless Steels AISI 304 and AISI 316
(Spectrul zgomotului electrochimic și relația acestuia cu procesele de pasivare a oțelurilor inoxidabile AISI 304 și AISI 316)
Vol LXVII • No. 2/2015
Anatoliy Klymenko
Paton Electric Welding Institute of N.A.S. of Ukraine, Kyiv, Ukraine e-mail: Aklimenko@meta.ua

 Keywords   electrochemical noise, stainless steels, pitting corrosion, “noise” polarization resistance


 Abstract
The present work describes the researches regarding the passivation processes of stainless steels AISI 304 and AISI 316, performed using the method of electrochemical noise. Researches were carried out using the circuit designed with three identical electrodes in three various corrosion environments: 10% FeCl3, 0.1М NaHCO3 + 0.1М Na2CO3, 20% NaCl. Results of measurement have been processed mathematically using the MathCAD system. From the received data, the “noise” polarization resistance on electrodes in the investigated environments was counted. The calculated “noise” polarization resistance has been compared to polarization resistance received by the method of linear polarization. It has been found experimentally that steel AISI 316 is less inclined to formation of pittings in comparison with AISI 304.

 Rezumat
În prezenta lucrare, sunt descrise cercetările efectuate privind procesele de pasivare a oțelurilor inoxidabile AISI 304 și AISI 316, utilizând metoda zgomotului electrochimic. Cercetările au fost efectuate utilizând un circuit cu trei electrozi identici în trei medii corozive diferite: 10% FeCl3, 0.1М NaHCO3 + 0.1М Na2CO3, 20% NaCl. Rezultatele măsurătorilor au fost procesate cu ajutorul sistemului MathCAD. Din datele recepționate, s-a contorizat rezistența la polarizare a “zgomotului” în mediul investigat. Rezistența la polarizare a “zgomotului” calculată a fost comparată cu rezistența la polarizare recepționată prin metoda polarizării liniare. S-a constatat experimental că oțelul AISI 316 este mai puțin susceptibil la apariția pitting-ului în comparație cu oțelul AISI 304.




Journal INFO (ISSN 1224-8495)
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