A Study on Corrosion Behavior of DP-Type and TRIP-Type Cold Rolled Steel Sheet

作者：Park Il Jeong; Kim Soon Tae^*; Lee In Sung; Park Yong Soo; Moon Man Been

来源：Materials Transactions, 2009, 50(6): 1440-1447.

DOI：10.2320/matertrans.MRA2008252

• dual phase (DP) and transformation induced plasticity (TRIP)-type sheet
• galvanic corrosion
• area effect
• sulfide
• nitride

Corrosion behaviors of DP-type and TRIP-type cold rolled steel sheet have been investigated using cathodic Tafel extrapolation test and immersion test, measuring nano-scale hardness of various phases and the volume fraction of various phases, and analyzing inclusion and nitride. Based upon nano-scale hardness of various phases before and after potentiodynamic anodic polarization test in deaerated 5 mass% NaCl at 35 degrees C, the phase with the most inferior corrosion resistance in DP-type steel is martensite (alpha') and that in TRIP-type steel is bainite (alpha(B)). The reasons why corrosion rate of TRIP-type steel is lower than that of DP-type steel are first, the volume fraction (39.8 vol%) of bainite (alpha(B)) in TRIP-type steel is higher than that (15.9 vol%) of martensite (a') in DP-type steel and second, the corrosion resistance of oxide and nitride formed in TRIP-type steel is more than that of sulfide formed in DP-type steel. [doi:10.2320/matertrans.MRA2008252]

• 出版日期2009-6