Zn-Ni-Al合金热浸镀件组织和耐蚀性能的研究

发布时间：2018-05-02 23:31

本文选题：热镀锌 + 铝元素　；参考：《广西大学学报(自然科学版)》2017年06期

【摘要】：为探索不同成分的Zn-Ni-Al合金热浸镀件组织和耐腐蚀性能关系,了解微量铝对不同镀层组织、厚度和耐腐蚀性的综合影响规律,设计了4组Zn-0.10%Ni-x Al(x=0,0.08,0.12,0.15 wt.%)熔池合金对Q235钢进行热镀锌,利用光学显微镜、扫描电镜及能谱分析等技术对4种镀件镀层微观组织和合金成分进行观察和分析,并通过精密型盐雾试验机对其腐蚀速率进行测定和比较。实验结果表明,当锌液成分中含有0.08~0.15 wt.%Al时,镀层表面光亮美观,生成由δ(Fe Zn9)过渡层和η(Zn)锌层组成的致密镀层组织。Al含量在0.00~0.08 wt.%时,过渡层厚度呈现快速增大规律,Al含量在0.08~0.12 wt.%时,过渡层厚度出现减小趋势,而Al含量在0.12~0.15 wt.%时,过渡层厚度缓慢上升,而η(Zn)锌层厚度则表现为与过渡层厚度相反的变化规律。过渡层厚度越大,镀件的腐蚀速率越小,厚而致密的δ(Fe Zn9)过渡层对钢材的防护更有效。
[Abstract]:In order to explore the relationship between microstructure and corrosion resistance of hot-dip Zn-Ni-Al alloy with different composition, and to understand the comprehensive effect of trace aluminum on the microstructure, thickness and corrosion resistance of different coatings, four groups of Zn-0.10%Ni-x Al _ XO _ (0.08) 0.120.120.15wt.TZ molten pool alloys were designed for hot-dip galvanizing of Q235 steel. The microstructure and alloy composition of four kinds of coating were observed and analyzed by means of optical microscope, scanning electron microscope and energy dispersive analysis. The corrosion rate of the coating was measured and compared by a precision salt spray tester. The experimental results show that when the composition of zinc solution contains 0.080.15 wt.%Al, the surface of the coating is bright and beautiful, and a dense coating consisting of 未 -Fe Zn _ 9 transition layer and 畏 _ (Zn) Zn) layer is formed. The Al content of the coating is 0.008 wt.wt%. When the thickness of transition layer increases rapidly, the thickness of transition layer decreases when Al content is 0.08 ~ 0.12 wt.%, while the thickness of transition layer increases slowly when Al content is 0.12 ~ 0.15 wt.%, while the thickness of 畏 ~ (Zn) Zn layer is the opposite of the thickness of transition layer. The thicker the transition layer is, the smaller the corrosion rate of the plated part is. The thick and dense 未 Fe Zn 9) transition layer is more effective for the protection of steel.
【作者单位】：广西民族大学理学院;
【基金】：国家自然科学青年科学基金资助项目(51601042) 有色金属及材料加工新技术教育部重点实验室开放基金资助项目(GXKFJ09-18) 广西高校科学技术研究资助项目(YB2014108) 广西民族大学教改资助项目(2014XJZZ14) 自治区级大学生创新创业训练计划资助项目(201510608153) 国家级大学生创新创业训练计划资助项目(201510608028)
【分类号】：TG174.4

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