Journal
CORROSION
Volume 60, Issue 10, Pages 891-896Publisher
NATL ASSOC CORROSION ENG
DOI: 10.5006/1.3287822
Keywords
electrochemical corrosion; grain size effect; low-carbon steel; nanocrystallized material; ultrasonic shot peening
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A nanocrystallized surface was fabricated on low-carbon steel by ultrasonic shot peening (USSP) technique. The grain size on the top latter of the surface narrocrystallized (SNC) low-carbon steel was about 20 nm. which increased with distance from the peening surface. The electrochemical corrosion behavior of the SNC low-carbon steel with different grain sizes was studied by electrochemical methods in 0.05 M sulfuric acid (H2SO4) + 0.05 M sodium sulfate (Na2SO4) aqueous solution. Grain sizes <35 am showed a strong effect on the electrochemical corrosion behavior. The corrosion rate of the SNC low-carbon steel increased with the decreasing of grain size. This was attributed to the increased number of the active sites caused by SNC low-carbon steel.
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