Zn-Mg合金镀液中Al含量对批量热浸镀镀层结构的影响
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摘要
在Zn-Mg批量热浸镀时,添加Al能抑制Mg在镀液表面的氧化,但其会对镀层结构和组织产生影响。在Q235钢表面采用不同Al含量的Zn-Mg合金镀液制备了镀层。利用SEM,EDS,GDOES等技术分析了Al含量对Zn-Mg合金镀层组织、结构的影响。结果表明:随着Zn-Mg合金镀液中Al含量的增加,镀层中的Fe-Zn合金相层逐渐减薄,Al含量为0.150%时,Fe-Zn合金相层消失,镀层主要由自由锌层组成; Al主要存在于镀层/基体界面,且以Fe-Al金属间化合物形式存在; Fe-Zn合金相层的减薄主要原因是Fe-Al金属间化合物层的抑制作用。
When Zn-Mg alloy coatings were batch hot-dip galvanized on Q235 steel sheets,adding Al could inhibit the oxidation of Mg in bath,but also affect the structure and composition of coating. The coatings containing various Al contents were obtained on Q235 steel sheets,respectively. The effects of Al contents on coating microstructure and composition were analyzed by using SEM,EDS and GDOES. Results showed that with the increase of Al contents,the thickness of Fe-Zn phase layer decreased. When Al content reached up to 0.150%,the Fe-Zn phase layer disappeared. In addition,the coating was mainly composed of free zinc layer. Aluminum was mainly distributed on the interface of coating and substrate,and which existed as a Fe-Al intermediate layer. Besides,the main reason that caused the thickness decrease of Fe-Zn alloy phase layer was that the Fe-Al intermediate alloy layer inhibited the growth of the Fe-Zn alloy phase in the coating.
When Zn-Mg alloy coatings were batch hot-dip galvanized on Q235 steel sheets,adding Al could inhibit the oxidation of Mg in bath,but also affect the structure and composition of coating. The coatings containing various Al contents were obtained on Q235 steel sheets,respectively. The effects of Al contents on coating microstructure and composition were analyzed by using SEM,EDS and GDOES. Results showed that with the increase of Al contents,the thickness of Fe-Zn phase layer decreased. When Al content reached up to 0.150%,the Fe-Zn phase layer disappeared. In addition,the coating was mainly composed of free zinc layer. Aluminum was mainly distributed on the interface of coating and substrate,and which existed as a Fe-Al intermediate layer. Besides,the main reason that caused the thickness decrease of Fe-Zn alloy phase layer was that the Fe-Al intermediate alloy layer inhibited the growth of the Fe-Zn alloy phase in the coating.
引文
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[3]李锋,吕家舜,杨洪刚.锌铝镁镀层钢板的研究进展[J].轧钢,2013,30(2):45-51.
[4]吕家舜,李锋,杨洪刚.热浸镀锌铝镁钢板镀层组织及腐蚀性能研究[J].材料工程,2012,40(10):89-93.
[5] HOSKING N C,STROM M A,SHIPWAY P H,et al.Corrosion resistance of zinc-magnesium coated steel[J].Corrosion Science,2007,49(9):3 669-3 695.
[6] DUTTA M,HALDER A K,SINGH S B. Morphology and properties of hot dip Zn-Mg and Zn-Mg-Al alloy coatings on steel sheet[J]. Surface and Coatings Technology,2010,205(7):2 578-2 584.
[7] VOLOVITCH P,ALLELY C,OGLE K. Understanding corrosion via corrosion product characterization:I. Case study of the role of Mg alloying in Zn-Mg coating on steel[J].Corrosion Science,2009,51(6):1 251-1 262.
[8] DUCHOSLAV J,ARNDT M,STEINBERGER R,et al.Nanoscopic view on the initial stages of corrosion of hot dip galvanized Zn-Mg-Al coatings[J]. Corrosion Science,2014,83(3):327-334.
[9]吴长军,尹力,苏旭平,等. Zn Fe Mg三元系450℃等温截面实验测定:第十六届全国相图学术会议暨相图与材料设计国际研讨会[C].常州:常州大学,2012:350-351.
[10]曲家惠,金浩,王福,等.镁对IF钢热镀锌镀层的组织和性能的影响[J].腐蚀科学与防护技术,2008(1):9-11.
[11]山口洋,久松敬弘.連續溶融亞鉛メツキにぉけゐ溶融亞鉛のAlの影響[J].铁と鋼,1973,59(1):131-141.
[12]山口洋,久松敬弘.薄鋼板の溶融亞鉛メツキにぉけゐ反应機構[J].铁と鋼,1977,63(7):1 160-1 169.