The electric current pulse (ECP) was applied on the liquidus of 304 stainless steel during solidification and the pitting corrosion of the water-quenched specimens was explored in the present work. The results revealed that the utilisation of ECP can inhibit manganese sulphide from segregating around oxide inclusions during solidification and consequently, the pitting corrosion resistance of ECPed steel was significantly improved. Hence, the application of ECP during solidification might be an efficient way to improve the pitting corrosion resistance of the 304 stainless steel.
This paper is part of a themed issue on Materials in External Fields.
ChibaA, MutoI, YuS, Effect of atmospheric aging on dissolution of MnS inclusions and pitting initiation process in type 304 stainless steel. Corros Sci. 2016;106:25–34. doi: 10.1016/j.corsci.2016.01.022
2.
CruzRPV, NishikataA, TsuruT. Pitting corrosion mechanism of stainless steels under wet-dry exposure in chloride-containing environments. Corros Sci. 1998;40:125–139. doi: 10.1016/S0010-938X(97)00124-8
3.
ZhengSJ, WangYJ, ZhangB, Identification of MnCr2O4, nano-octahedron in catalysing pitting corrosion of austenitic stainless steels. Acta Mater. 2010;58:5070–5085. doi: 10.1016/j.actamat.2010.05.043
4.
ZhangL, ThomasBG. Inclusions in continuous casting of steel. XXIV National Steelmaking Symposium. 2003;1074:26–28.
5.
KeR, AlkireR. Surface analysis of corrosion pits initiated at MnS inclusions in 304 stainless steel. J Electrochem Soc. 1992;139:1573–1580. doi: 10.1149/1.2069458
6.
EklundGS. Initiation of pitting at sulfide inclusions in stainless steel. J Electrochem Soc. 1974;121:467–473. doi: 10.1149/1.2401840
7.
BakerMA, CastleJE. The initiation of pitting corrosion at MnS inclusions. Corros Sci. 1993;34:667–682. doi: 10.1016/0010-938X(93)90279-P
8.
CastleJE, KeR.Studies by auger spectroscopy of pit initiation at the site of inclusions in stainless steel. Corros Sci. 1990;30:409–428. doi: 10.1016/0010-938X(90)90047-9
9.
SmialowskiM, Szklarska-SmialowskaZ, RychcikM, Effect of sulphide inclusions in a commercial stainless steel on the nucleation of corrosion pits. Corros Sci. 1969;9:123–125. doi: 10.1016/S0010-938X(69)80048-X
10.
KeR, AlkireR. Initiation of corrosion pits at inclusions on 304 stainless steel. J Electrochem Soc. 1995;142:4056–4062. doi: 10.1149/1.2048462
11.
RovereCAD, AlanoJH, OtuboJ, Corrosion behavior of shape memory stainless steel in acid media. J Alloys Compd. 2011;509:5376–5380. doi: 10.1016/j.jallcom.2011.02.051
12.
QinRS, YanHC, HeGH, Exploration on the fabrication of bulk nanocrystalline materials by direct-nanocrystallizing method. Chin J Mater Res. 1995; 9:219–222.
13.
ZhangXF, LuWJ, QinRS. Morphology and distribution control of MnS inclusions in molten steel by electropulsing. Mater Res Innov. 2014;18:244–248.
14.
ConradH. Effects of electric current on solid state phase transformations in metals. Mater Sci Eng A. 2000;287:227–237. doi: 10.1016/S0921-5093(00)00780-2
15.
DaiWB, YuJK, DuCM, Refinement of inclusions in molten steel by electric current pulse. Mater Sci Technol. 2015;31:1555–1559. doi: 10.1179/1743284715Y.0000000015
16.
MohlaPP, BeechJ. Effect of cooling rate on the morphology of sulphide inclusions. J Iron Steel Inst. 1969;207:177–181.
