双相钢退火氧化物对热浸镀锌未镀点之影响.pdf

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2019-11-30 发布于天津
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双相钢退火氧化物对热浸镀锌未镀点之影响.pdf

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雙相鋼退火氧化物對熱浸鍍鋅未鍍點之影響 The Effect of Annealing Oxide on the Formation of Bare Spot of Hot Dip Galvanized Dual Phase Steel 1 2 3 3 W.J. Cheng, J.H. Shen, K.C. Yang, L.J. Chiang Hot dip galvanized dual phase (DP) steel has been widely used as automobile components due to its high strength and anti-corrosion ability. However, the addition of alloy element, Mn, caused the selective oxidation of the steel. This selective oxidation of the steel retarded the diffusion between steel and zinc bath leading to the formation of bare spot. In this study, we investigated the causal relationship between the 150~200 nm annealing oxidation on the steel surface and the bare MnO MnO spot formation. Results showed that there was a MnO oxide, with 150~200nm in diameter, formed on the bare spot surface instead of zinc. The MnO was reduced due MnO to thermite reaction leading to the formation of zinc or MnO Zn-Fe phases. The formation of bare spot defect of DP steel was caused by the formation of MnO oxide on Fe2(Al,Zn)5 the steel surface that inhibited the formation of Fe2(Al, Zn)5 intermetallic layer. 關鍵字： Key words: Dual phase steel, annealed oxidation, bare spot, thermite reaction 一、前　言 1970