CAJ | 학술논문

采用X射线衍射仪、扫描电子显微镜、能谱仪、透射电子显微镜、全浸腐蚀及中性盐雾腐蚀试验等方法，对比研究 Zn-0.5Al-1.5Mg、Zn-2Al-1.5Mg 和 Zn-2Al-1.5Mg-0.3Si(质量分数，%)合金镀层的组织与性能，探讨 Al和 Si 对热浸 Zn-Al-Mg 合金镀层组织和耐腐蚀性能的影响。结果表明：三合金镀层的组成相是 Zn 相、Al 相和MgZn2相；Zn-0.5Al-1.5Mg合金镀层由块状富Zn相和晶界Zn+MgZn2二元共晶组织组成，Zn-2Al-1.5Mg合金镀层由块状富Zn相和晶界Zn+Al+MgZn2三元共晶组织组成，Zn-2Al-1.5Mg-0.3Si合金镀层由块状富Zn相、晶界Zn+Al+MgZn2三元共晶组织和针状相Mg2Si组成；Al、Mg和Si主要分布在晶界，Al和Si有细化镀层晶粒作用，添加Si能提高Zn-Al-Mg合金镀层的耐腐蚀性能。
채용X사선연사의、소묘전자현미경、능보의、투사전자현미경、전침부식급중성염무부식시험등방법，대비연구 Zn-0.5Al-1.5Mg、Zn-2Al-1.5Mg 화 Zn-2Al-1.5Mg-0.3Si(질량분수，%)합금도층적조직여성능，탐토 Al화 Si 대열침 Zn-Al-Mg 합금도층조직화내부식성능적영향。결과표명：삼합금도층적조성상시 Zn 상、Al 상화MgZn2상；Zn-0.5Al-1.5Mg합금도층유괴상부Zn상화정계Zn+MgZn2이원공정조직조성，Zn-2Al-1.5Mg합금도층유괴상부Zn상화정계Zn+Al+MgZn2삼원공정조직조성，Zn-2Al-1.5Mg-0.3Si합금도층유괴상부Zn상、정계Zn+Al+MgZn2삼원공정조직화침상상Mg2Si조성；Al、Mg화Si주요분포재정계，Al화Si유세화도층정립작용，첨가Si능제고Zn-Al-Mg합금도층적내부식성능。
The microstructure and properties of Zn-0.5Al-1.5Mg, Zn-2Al-1.5Mg and Zn-2Al-1.5Mg-0.3Si (mass fraction, %) alloy coatings were comparatively studied, and the effects of Al and Si on the microstructure and the corrosion resistance of hot dipping Zn-Al-Mg alloy coatings were investigated by X-ray diffraction, scanning electron microscope, energy dispersive spectrometer, transmission electron microscope, full immersion corrosion and neutral salt spray test. The results show that the composition phases of three alloy coatings are Zn, Al and MgZn2 phases. Zn-0.5Al-1.5Mg alloy coating is composed of bulk Zn-rich phase and Zn+MgZn2 eutectic structure at the grain boundary, Zn-2Al-1.5Mg alloy coating is composed of bulk Zn-rich phase and Zn+Al+MgZn2 eutectic structure at the grain boundary, Zn-2Al-1.5Mg-0.3Si alloy coating is composed of bulk Zn-rich phase, Zn+Al+MgZn2 eutectic structure at the grain boundary and acicular Mg2Si. The Al, Mg and Si distribute mainly at the grain boundary. The Al and Si possess the functions of refining the grain size. The corrosion resistance can be enhanced by the addition of Si in Zn-Al-Mg alloy coating.