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材料研究学报  2014, Vol. 28 Issue (1): 23-30    DOI: 10.11901/1005.3093.2013.548
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锌液中的Al含量对热冲压钢锌层组织的影响*
杨洪林1,张深根1(),洪继要2,刘昕2,李俊2,王华3
1. 北京科技大学材料科学与工程学院 北京 100083
2. 宝钢集团中央研究院 上海 201900
3. 上海大学材料科学与工程学院 上海 200072
Effect of Al Content on the Microstructure of Hot-Depped Zinc Coating on Hot Stamping Steel
Honglin YANG1,Shengen ZHANG1,**(),Jiyao HONG2,Xin LIU2,Jun LI2,Hua WANG3
1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083
2. Central Research Institute of Baosteel, Shanghai, 201900
3. School of Materials Science and Engineering, Shanghai University, Shanghai 200072
引用本文:

杨洪林,张深根,洪继要,刘昕,李俊,王华. 锌液中的Al含量对热冲压钢锌层组织的影响*[J]. 材料研究学报, 2014, 28(1): 23-30.
Honglin YANG, Shengen ZHANG, Jiyao HONG, Xin LIU, Jun LI, Hua WANG. Effect of Al Content on the Microstructure of Hot-Depped Zinc Coating on Hot Stamping Steel[J]. Chinese Journal of Materials Research, 2014, 28(1): 23-30.

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摘要: 

采用热镀锌模拟实验装置在四种不同铝含量锌液中进行连续热镀锌实验, 分别制备出具有不同锌层组织的热冲压钢。用扫描电镜、能谱仪和辉光放电光谱仪等手段研究了锌液中不同铝含量对热冲压钢镀层组织形貌的影响。结果表明, 在不同铝含量的锌液中热冲压钢均具有良好的可镀性, 锌液中的铝含量对锌层/钢界面处的合金层组织、形貌、化学成分和锌层光亮性均有较大的影响。在光亮退火过程中钢板表面发生锰、 硅等元素的富集及选择性氧化, 且Mn-Si氧化物与锌液中的铝发生氧化还原反应。锌液中的铝含量(质量分数, 下同)为0.11%时, 锌层/钢界面处形成了连续的ζ相; 当锌液中的铝含量为0.17%时, 锌层/钢界面处由Fe-Al相和ζ相组成; 当铝含量为0.25%时, 界面层主要为粗糙的Fe2Al5颗粒; 铝含量为0.43%时颗粒状的Fe2Al5相消失, 界面层变得光滑。同时, 随着锌液中铝含量的提高锌层的光亮性逐渐变差。

关键词 金属材料热冲压钢热镀锌抑制层选择氧化    
Abstract

Different galvanized coatings on hot stamping steel was obtained by using hot dip galvanizing simulation experiment device dipping in zinc baths with four different Al contents. The effect of Al content on the microstructure of galvanized was investigated using SEM/EDS and glow discharge optical emission spectrometer (GDOES).The results show that press-hardened steel has good reactive wetting in different Al content zinc bath. The Al content (mass fraction) in zinc bath has a significant influence on coating/steel interface composition, morphology and light property. Enrichment of Mn, Si elements occurred in the steel surface during bright annealing process, and the Mn-Si oxides react (redox reaction) with Al in zinc bath. For 0.11% dissolved Al bath, continuous ζ phases formed at the coating/steel interface. For 0.17% dissolved Al bath, the coating/steel interface consist of ζ phases and Fe-Al phases. A continuous Fe2Al5 inhibition layer achieved in baths with Al content 0.25% and 0.43%, and the morphology of interface layer became coarser when Al content in zinc bath was 0.25%. In addition, with the increase of Al content in zinc bath, the light property of zinc coatings gradually became worse.

Key wordsmetallic materials    press-hardened steel    galvanizing    inhibition layer    selective oxidation
收稿日期: 2013-07-30     
基金资助:* 国家九七三计划2012CB723904 资助项目。
图1  试样的退火曲线
图2  退火后的钢板表面扫描照片及氧化物的EDS分析(质量分数)
图3  退火后钢板表面元素的GDOES深度分析(800℃/60 s, DP: -30℃, N2+5%H2)
图4  不同铝含量锌层的表面对比
图5  不同锌层表面处的铝元素分布
图6  不同铝含量钢/镀层界面处的SEM像
Point Al Fe Zn Mn O
1 0.76 14.64 81.84 2.76
2 4.23 88.75 2.19 0.95 3.88
3 1.02 15.15 81.84 - 1.99
4 6.54 93.17 0.29 - -
5 11.98 88.02 - - -
6 6.07 93.93 - - -
表1  图6中各点的EDS分析
图7  不同铝含量锌层的背散射照片
图8  不同铝含量镀层中各元素的GDOES深度分析
图9  铝含量对界面层形貌的影响
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