Effect Of Chromium Carbide (Cr23C6) Formation On Microstructure And Corrosion Passivity Behavior Of AISI 304 Stainless Steel

Siti Faizah , Mad Asasaari (2010) Effect Of Chromium Carbide (Cr23C6) Formation On Microstructure And Corrosion Passivity Behavior Of AISI 304 Stainless Steel. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

This project aimed to study the effect of chromium carbide, Cr23C6 formation on the microstructure and corrosion resistance behavior of AISI 304 stainless steels in 3.5 % NaCl solution. Five specimens of AISI 304, 15 mm x 15 mm x 2 mm each size with various heating time, 5 seconds, 10 seconds, 20 seconds, 40 seconds, and 60 seconds respectively are used. All specimens are immersed in 3.5 % NaCl solution, for cyclic potentiodynamic polarization technique with a scan rate of 0.5 mV/s, then, the corrosion behavior of AISI 304 was analyzed. The Cr23C6 formation on the microstructure of AISI 304 to resist pitting corrosion is studied by exposed the specimens to the heating time and five different pH solutions which is pH 3, pH 5, pH 7, pH 9, and pH 12. The number of Cr23C6 formation is high at 60 s of heating time by observing on the optical microscope. X-ray diffraction (XRD) analysis is used to study the Cr23C6 formation that presence on the structure of AISI 304. The increase in number and size of Cr23C6 performed in the structure of AISI 304, the corrosion resistance of the specimens decrease. At high heating time and more acidic solution, the pitting corrosion attack is increased. Based on the cyclic polarization scan, it is clear that at 60 s, the value of high potential stress is 0.325 V, decreases from 0.420 V as performed by 5 s heating time. While for the effect of pH solution, specimen immersed in pH 3 shows the lowest potential, 0.32 V as performed by specimen number one.

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