挤压处理与Ca添加对Mg-7Sn合金显微组织与耐蚀性的影响
Effects of Extrusion Treatment and Calcium Addition on the Microstructure and Corrosion Resistance of Mg-7Sn Alloy
摘 要
利用金相显微镜(OM)、扫描电子显微镜(SEM)、X射线光电子能谱(XPS)、电化学试验与浸泡试验等研究了挤压处理与添加合金元素Ca对Mg-7Sn合金显微组织、耐蚀性及力学性能的影响。结果表明:添加Ca元素可以明显细化铸态Mg-7Sn合金的晶粒,并在晶粒内部与晶界形成了棒状的CaMgSn相,同时,腐蚀过程中,添加Ca会使合金表面形成含Ca的化合物,阻止或延缓腐蚀的进行,提高合金的耐蚀性。挤压处理使得合金的平均晶粒尺寸由55.2 μm减小到3.3 μm,粗大棒状的CaMgSn相被破碎成细小的块状。挤压处理后Mg-7Sn-1Ca合金的耐蚀性出现轻微下降,但保证了较高的显微硬度。挤压态Mg-7Sn-1Ca合金兼具力学性能和耐蚀性。
Ca添加
挤压处理
显微组织
耐腐蚀性能
Mg-7Sn alloy
Ca addition
extrusion treatment
microstructure
corrosion resistance
Abstract
The effects of extrusion treatment and addition of alloying element Ca on the microstructure, corrosion resistance and mechanical properties of Mg-7Sn alloy were studied by optical microscopy (OM), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), electrochemical test and immersion test.The results showed that the addition of Ca element could significantly refine the grains of the cast Mg-7Sn alloy, and form rod-shaped CaMgSn with grain boundaries within the grains. At the same time, during the corrosion process, the addition of Ca could form compounds containing Ca on the alloy surface, prevent or delay corrosion, and improve the corrosion resistance of the alloy. The extrusion treatment reduced the average grain size of the alloy from 55.2 μm to 3.3 μm, and the coarse rod-shaped CaMgSn phase was broken into small blocks. After extrusion treatment, the corrosion resistance of Mg-7Sn-1Ca alloy slightly decreased, but high microhardness was ensured. The extruded Mg-7Sn-1Ca alloy exhibited both good mechanical properties and corrosion resistance.
中图分类号 TG146.2 DOI 10.11973/fsyfh-202307008
所属栏目 试验研究
基金项目 基承德市科学技术研究与发展计划项目(202103B011)
收稿日期 2021/11/5
修改稿日期
网络出版日期
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引用该论文: LI Wandong,HUANG Lili,WANG Xinghua. Effects of Extrusion Treatment and Calcium Addition on the Microstructure and Corrosion Resistance of Mg-7Sn Alloy[J]. Corrosion & Protection, 2023, 44(7): 46
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【2】刘亚,文九巴,李欢,等. 固溶温度对Mg-Zn-Gd-Y-Zr生物可降解合金组织及性能影响[J]. 稀有金属材料与工程,2021,50(8):2850-2858.
【3】桑恒,敬和民,宋广生,等. 固溶处理AZ91-xCu合金的组织与腐蚀性能[J]. 金属热处理,2021,46(3):125-130.
【4】HYUN J M,SANG C J,JAE G J,et al. Influence of undissolved second-phase particles on dynamic recrystallization behavior of Mg-7Sn-1Al-1Zn alloy during low-and high-temperature extrusions[J]. Journal of Materials Science & Technology,2021,71:87-97.
【5】SASAKI T T,ELSAYED F R,NAKATA T,et al. Strong and ductile heat-treatable Mg-Sn-Zn-Al wrought alloys[J]. Acta Materialia,2015,99:176-186.
【6】YANG M B,PAN F S. Effects of Y addition on as-cast microstructure and mechanical properties of Mg-3Sn-2Ca (wt.%) magnesium alloy[J]. Materials Science and Engineering A,2009,525(1/2):112-120.
【7】CHAI Y F,HE C,JIANG B,et al. Influence of minor Ce additions on the microstructure and mechanical properties of Mg-1.0Sn-0.6Ca alloy[J]. Journal of Materials Science & Technology,2019(2):26-37.
【8】武华健,程仁山,李景仁,等. Al含量对Mg-Sn-Ca合金微观组织与力学性能的影响[J]. 金属学报,2020,56(10):1423-1432.
【9】HUANG X F,WU A L,LI Q,et al. Effects of extrusion and Ag,Zn addition on the age-hardening response and microstructure of a Mg-7Sn alloy[J]. Materials Science and Engineering A.2016,661:233-239.
【10】HUANG S H. Microstructure and mechanical properties of a Ag micro-alloyed Mg-5Sn alloy[J]. Journal of Materials Engineering and Performance,2018,27(7):3199-3205.
【11】LEE Y C,DAHLE A K,STJOHN D H. The role of solute in grain refinement of magnesium[J]. Metallurgical and Materials Transactions A,2000,31(11):2895-2906.
【12】MAHALLAWYN N E,AHMED D A,AKDESIR M,et al. Effect of Zn addition on the microstructure and mechanical properties of cast,rolled and extruded Mg-6Sn-xZn alloys[J]. Materials Science & Engineering A,2017,680(5):47-53.
【13】雷雪,王日初,彭超群,等. Nd对Mg-11Li-3Al-2Zn-0.2Zr合金组织、力学性能及腐蚀行为的影响[J]. 有色金属科学与工程,2019,10(3)46-53.
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【15】刘威,白朴存,崔晓明,等. Ca对AZ91镁合金显微组织和性能的影响[J]. 热加工工艺,2014,43(12):51-53.
【16】ZHANG Y,CHEN X Y,LU Y L,et al. Microstructure and mechanical properties of as-extruded Mg-Sn-Zn-Ca alloy with different extrusion ratios[J]. Transactions of Nonferrous Metals Society of China,2018,28(11):2191-2199.
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【18】李会新,姬莉,高黎黎,等. Ca含量对Mg-Al-Zn合金组织及腐蚀性能的影响[J]. 铸造技术,2018,39(5):988-991.
【19】LIU Q,CHENG W L,ZHANG H,et al. The role of Ca on the microstructure and corrosion behavior of Mg-8Sn-1Al-1Zn-Ca alloys[J]. Journal of Alloys and Compounds,2014,590:162-167.
【20】余琨,胡亚男,谭欣,等. 海水激活电池用Mg-Hg-Ga合金阳极材料的腐蚀行为[J]. 中南大学学报(自然科学版),2012,43(2):466-471.
【21】ARRABAL R,PARDO A,MERIN M C,et al. Effect of Nd on the corrosion behaviour of AM50 and AZ91D magnesium alloys in 3.5wt.% NaCl solution[J]. Corrosion Science,2012,55:301-312.
【22】CUI Z Y,GE F,LIN Y,et al. Corrosion behavior of AZ31 magnesium alloy in the chloride solution containing ammonium nitrate[J]. Electrochimica Acta,2018,278:421-437.
【23】BAKHSHESHI-RAD H R,ADUL-KADIR M R,IDRIS M H,et al. Relationship between the corrosion behavior and the thermal characteristics and microstructure of Mg-0.5Ca-xZn alloys[J]. Corrosion Science,2012,64:184-197.
【24】CHENG W L,MA S C,BAI Y,et al. Corrosion behavior of Mg-6Bi-2Sn alloy in the simulated body fluid solution:The influence of microstructural characteristics[J]. Journal of Alloys and Compounds,2018,731:945-954.
【25】LU Y,BRADSHAW A R,CHIU Y L,et al. Effects of secondary phase and grain size on the corrosion of biodegradable Mg-Zn-Ca alloys[J]. Materials Science & Engineering C,2015,48:480-486.
【26】TANG J W,CHEN L,LI Z G,et al. Formation of abnormal coarse grains and its effects on corrosion behaviors of solution treated ZK60 Mg alloy[J]. Corrosion Science,2021,180:1-17.
【27】WANG L,SHINOHARAA T,ZHANG BP,et al. Characterization of surface products on AZ31 magnesium alloy in dilute NaCl solution[J]. Journal of Alloys and Compounds 485 (2009) 747-752.
【28】LIU W J,CAO F H,JIA B L,et al. Corrosion behaviour of AM60 magnesium alloys containing Ce or La under thin electrolyte layers. Part 2:Corrosion product and characterization[J]. Corrosion Science,2010,52(2):639-650.
【29】WANG J F,LI Y,HUANG S,et al. Study of the corrosion behavior and the corrosion films formed on the surfaces of Mg-xSn alloys in 3.5wt.% NaCl solution[J]. Applied Surface Science,2014,317:1143-1150.
【30】马莹,郭阳,张忠明,等. Ca对铸态Mg-4Zn合金组织及腐蚀性能的影响[J]. 材料热处理学报,2015,36(1)62-69.
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