无铵助镀剂条件下氯化镍对锌层厚度及组织结构的影响
Effect of NiCl2 Content in Flux without Ammonium on the Thickness and Structure of Batch Hot-dip Galvanized Coatings
摘 要
采用光学显微镜和扫描电镜对角钢在氯化镍含量不同的无铵助镀剂中助镀获得的镀层进行了镀层金属间化合物层形貌和镀层厚度的分析.结果表明,在一定范围内,随着氯化镍含量的增加,获得的镀层厚度不断减小,当氯化镍含量增加到6 g/L时镀层厚度不再随氯化镍含量的增加而减薄,氯化镍含量增加到6~8 g/L时镀层最薄,氯化镍含量为4~8 g/L时能获得厚度适中的镀层;氯化镍含量对镀锌层的形貌有影响,随着氯化镍含量的增加金属间化合物层中的ζ金属间化合物层减薄,晶粒尺寸减小.Γ和δ金属间化合物变化不明显.
批量镀
镀层厚度
金属间化合物
NiCl2
batch galvanized coating
coating thickness
intermetallic compound
Abstract
The thickness and morphology of coatings and intermetallic compound layers on Q235 steel pretreated in fluxes without ammonium but with different NiCl2 contents were analyzed by OM and SEM.The study showed that with the increase of NiCl2 content,the thickness of galvanizing coatings decreased,and with the increase of NiCl2 content the thickness of coatings decreased in a certain concentration range (0-6 g/L).However,when NiCl2 content surpassed the range,the thickness of coatings wouldn′t change with the increase of NiCl2 content,the coating thickness reached minimum when NiCl2 content was 6 g/L.To get a coating with appropriate thickness,NiCl2 content should be 4-8 g/L.NiCl2 would refine the ζ intermetallic phase,make it more compact and decrease its thickness.However NiCl2 had no obvious influence on Γ and δ intermetallic phases.
中图分类号 TG174
所属栏目 镀层专题
基金项目 国家电网科技项目(521820130014)
收稿日期 2014/6/11
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备注王贺贺(1988-),硕士研究生,从事电镀相关研究.
引用该论文: TU Zhan,WANG He-he,LI Yuan-peng,JIANG She-ming,TANG Nan,YANG You-hua,YU Gang-qiang. Effect of NiCl2 Content in Flux without Ammonium on the Thickness and Structure of Batch Hot-dip Galvanized Coatings[J]. Corrosion & Protection, 2015, 36(5): 435
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参考文献
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【4】BOONYONGMANEERAT Y,SAENGKIETTIYUT K,RATTANAWALEEDIROJN P,et al.Effect of NiCl2 based fluxes on interfacial layer formation of hot dip galvanized steels[J].Journal of Iron and Steel Research:International,2010,17(8):74-78.
【5】PISTOFIDIS N,VOURLIAS G,KONIDARIS S,et al.The effect of preflux bath additives on the morphology and structure of the hot-dip galvanized coatings[J].Crystal Research and Technology,2006,41(8):759-765.
【6】FRATESI R,RUFFINI N,MALAVOLTA M,et al.Contemporary use of Ni and Bi in hot-dip galvanizing[J].Surface and Coatings Technology,2002,157(1):34-39.
【7】李俊红.锌镍合金的研制[J].有色金属:冶炼部分,2006(3):51-53.
【8】MARDER A R.The metallurgy of zinc-coated steel[J].Progress in Materials Science,2000,45(3):191-271.
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