首页|ToF-SIMS characterization of a bare-spot defect in a hot-dip galvanized boron-added steel sheet
ToF-SIMS characterization of a bare-spot defect in a hot-dip galvanized boron-added steel sheet
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To determine the root cause of a bare-spot defect in a hot-dip galvanized boron-added steel sheet,we performed metallurgical characterizations using time-of-flight secondary ion mass spectrometry(ToF-SIMS)in addition to glow discharge optical emission spectrometry,field-emission scanning electron microscopy(FE-SEM),and energy dispersive spectroscopy.Mn and B enrichments on the steel surface in the bare-spot area were detected through various methods.FE-SEM revealed external oxide nodules and zinc droplets,which indicated poor wettability.ToF-SIMS further revealed considerably more detailed lateral and depth distributions of Mn,B,and Al.The formation of external Mn-B compound oxides on the steel surface prior to hot dipping,which substantially deteriorated the wettability and prevented the formation of a Fe2Al5 inhibition layer,resulted in the formation of a bare-spot defect.ToF-SIMS mapping of Al ion proved that a slight reaction still occurred between the dissolved Al in the molten zinc bath and steel substrate,although no evident Fe2Al5 inhibition layer formed in the bare-spot area.
bare spotselective oxidationgalvanized steelToF-SIMS
JIN Xinyan、HONG Jufeng
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Research Institute,Baoshan Iron & Steel Co.,Ltd.,Shanghai 201999,China
State Key Laboratory of Development and Application Technology of Automotive Steels(Baosteel),Shanghai 201999,China
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