金属-铸型界面反应法制备镁合金合金化表层的热力学分析及试验研究
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摘要
提出镁合金凝固过程中与预置在铸型表面的合金元素前躯体反应,制备镁合金合金化表层的新思路。以ZnS为前躯体计算分析其热力学可行性,并进行相关试验研究。结果表明:Mg与ZnS反应生成Zn和Mg S,在693~1 000 K具有热力学可行性;液态Mg在表面预置ZnS的铸型中凝固后,Mg表面Zn的质量分数为10.0%,Zn的质量分数由表及里逐步降低,表面以下距离超过35μm后,Zn的质量分数近乎为0。
The reactions between magnesium and precursor of alloying elements preseted on the mold surface were applied to prepare alloying surface on magnesium alloy during solidification. ZnS was selected as the precursor and the thermodynamic feasibility was demonstrated. The surface reaction between the precursor ZnS and Mg was studied with experiment. The results show that it is feasible to generate Znand Mg S by the reaction of Mg and ZnS at the temperature range of 693-1 000 K. After the solidification of liquid Mg in the preseted ZnS mold,the mass fraction of Znon Mg surface is 10.0%. From the surface to the centre,the mass fraction of Zndecreases gradually. When the depth from surface exceeds 35 μm,the mass fraction of Znis close to zero.
The reactions between magnesium and precursor of alloying elements preseted on the mold surface were applied to prepare alloying surface on magnesium alloy during solidification. ZnS was selected as the precursor and the thermodynamic feasibility was demonstrated. The surface reaction between the precursor ZnS and Mg was studied with experiment. The results show that it is feasible to generate Znand Mg S by the reaction of Mg and ZnS at the temperature range of 693-1 000 K. After the solidification of liquid Mg in the preseted ZnS mold,the mass fraction of Znon Mg surface is 10.0%. From the surface to the centre,the mass fraction of Zndecreases gradually. When the depth from surface exceeds 35 μm,the mass fraction of Znis close to zero.
引文
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[20]梁英教,车荫昌.无机物热力学数据手册[M].沈阳:东北大学出版社,1993:452-455.
[2]陈愚,肖泽辉,谭香玲.镁合金表面熔覆改性技术的研究进展[J].材料导报,2008,22(3):90-93.
[3]PAN C J,HOU Y,WANG Y N,et al.Effects of self-assembly of 3-phosphonopropionic acid,3-aminopropyltrimethoxysilane and dopamine on the corrosion behaviors and biocompatibility of a magnesium alloy[J].Materials Science and Engineering C,2016,67:132-143.
[4]YANG W,ZHU Z J,WANG J J,et al.Slow positron beam study of corrosion behavior of AM60B magnesium alloy in NaCl solution[J].Corrosion Science,2016,106:271-280.
[5]LI J R,JIANG Q T,SUN H Y,et al.Effect of heat treatment on corrosion behavior of AZ63 magnesium alloy in 3.5wt.%sodium chloride solution[J].Corrosion Science,2016,111:288-301.
[6]张志彬,梁秀兵,陈永雄,等.镁合金表面热喷涂铝基涂层研究进展[J].材料导报,2013(3):41-44.
[7]曹亚男,张艳梅,揭晓华,等.镁合金表面激光熔覆的研究现状[J].材料导报,2011(9):99-102.
[8]TANG H,GAO Y.Preparation and characterization of hydroxyapatite containing coating on AZ31 magnesium alloy by microarc oxidation[J].Journal of Alloys and Compounds,2016,688:699-708.
[9]ZHANG S,WU C L,ZHANG C H,et al.Laser surface alloying of Fe Co Cr Al Ni high-entropy alloy on 304 stainless steel to enhance corrosion and cavitation erosion resistance[J].Optics&Laser Technology,2016,84:23-31.
[10]VALKOVA S,PETROVA P,LAZAROVAB R,et al.Formation and characterization of Al-Ti-Nb alloys by electron-beam surface alloying[J].Applied Surface Science,2016,389:768-774.
[11]张松,吴臣,亮王超,等.铁单元素基合金表面激光高熵合金化涂层的制备[J].金属学报,2014,50(5):1308-1313.
[12]ELSENTRIECY H H,QU J,LUO H M,et al.Improving corrosion resistance of AZ31B magnesium alloy via a conversion coating produced by a protic ammonium-phosphate ionic liquid[J].Thin Solid Films,2014,568:44-51.
[13]张艳,梁伟,王红霞,等.AZ91D镁合金表面真空扩散渗铝层结构及性能研究[J].稀有金属材料与工程,2008,37(11):2023-2026.
[14]ALMEIDA A,CARVALHO F,CARVALHO P A,et al.Laser developed Al-Mo surface alloys:microstructure,mechanical and wear behavior[J].Surface and Coatings Technology,2006,200:4782-4790.
[15]田造轩.AZ91镁合金激光表面改性后的微观组织和耐腐蚀性能研究[J].铸造技术,2015,36(6):1485-1487.
[16]孟德权,张永青,张伟强.中碳钢表面铸渗合金化层组织和性能研究[J].热加工工艺,2009,38(1):71-72.
[17]王长记,张国赏,魏世忠,等.铸钢表面镍钛铸渗层的制备及组织分析[J].铸造技术,2016,37(1):48-50.
[18]张禄廷,邵会孟,万贵森.热化学反应方法钢铁表面冶金强化新工艺初探[J].沈阳工业大学学报,1990(3):1-12.
[19]陈东风,丁洁,董选普,等.消失模铸造工艺表面合金化机理研究[J].功能材料,2014,45(13):13144-13147.
[20]梁英教,车荫昌.无机物热力学数据手册[M].沈阳:东北大学出版社,1993:452-455.