Abstract
Despite the excellent performance of stainless steel in diverse application, there are media of exposure may accelerate failure of several stainless steel alloys. The possibility of this failure has to be examined by measuring the effective parameters that may result in corrosion at different rates. The present study has been conducted to examine the effect of exposing specimens of 304 stainless steel to 0.5, 1.0, 1.5 and 2.0 M chloride concentration and 70, 80, and 90 °C. Electrochemical technique of measuring the potentials and currency of the examined system has been used to collect the corrosion data. Microstructure of the specimens is examined using Scanning Electron Microscopy and X- Ray Diffraction. Both of these tests revealed no serious phase change due to exposure even at severe conditions. The potentials gained show significant effect of the operation conditions.
Highlights
AISI 304 Stainless Steel is widely used in many applications because of its mechanical and corrosion properties
Despite the fact that the corrosion resistance of SS is improved by addition of alloying elements, still today, when exposed to chloride solutions, stainless steel suffer from localized corrosion.[10]
Even so, compared with the corrosion study of SS-304 at room temperature, the corrosion study at relatively high temperature is too scarce in the literatures.[11]
Summary
AISI 304 Stainless Steel is widely used in many applications because of its mechanical and corrosion properties. Its tendency to corrode in the presence of halide ions limits the applications.[1] The most common type of corrosion in 304 SS at high temperature is stress corrosion cracking. It is well known that the pits sites are frequently related to microscopic features of a metal surface.[2,3,4,5,6] It is known that the localized corrosion resistance of steel depends on the concentration of chloride in the environment.[7] Stainless steel 304 has more chances to be applied in relatively high temperature environment, such as nuclear power industry, chemistry industry.[8] Temperature has a great effect on the corrosion behavior of SS-304 exposed to the chloride environment.[9] Despite the fact that the corrosion resistance of SS is improved by addition of alloying elements, still today, when exposed to chloride solutions, stainless steel suffer from localized corrosion.[10] Generally as temperature increases, local corrosion occurs more and propagates faster, which can accelerate the failure of equipment greatly. The present work focus on corrosion behavior of 304 SS in chloride solution at high temperature using potentiostatic measurements
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