CAJ | 학술논문

采用烘干溶剂法在Q235钢表面获得Zn-(0.02~5)%Al和Zn-5%Al-0.05%RE(质量分数)合金镀层，用光学显微镜和扫描电镜观察合金镀层的宏观形貌和表面、断面组织形貌，用能谱仪分析合金镀层的合金元素分布，分别用中性盐雾实验和全浸腐蚀实验研究合金镀层的耐腐蚀性能。结果表明，锌浴中 Al 的质量分数为0.02%时， Zn-Al合金镀层的光亮度最好，随着Al含量增加光亮度下降；Zn-Al基合金镀层中，从外层的η相到接近钢基体的Γ相中，Zn含量逐渐减少，Fe和Al含量逐渐增加；随着镀浴中Al含量增加，热浸镀Zn-Al合金镀层的腐蚀速率减小；添加稀土元素能提高Zn-Al合金镀层的耐腐蚀性能。
채용홍간용제법재Q235강표면획득Zn-(0.02~5)%Al화Zn-5%Al-0.05%RE(질량분수)합금도층，용광학현미경화소묘전경관찰합금도층적굉관형모화표면、단면조직형모，용능보의분석합금도층적합금원소분포，분별용중성염무실험화전침부식실험연구합금도층적내부식성능。결과표명，자욕중 Al 적질량분수위0.02%시， Zn-Al합금도층적광량도최호，수착Al함량증가광량도하강；Zn-Al기합금도층중，종외층적η상도접근강기체적Γ상중，Zn함량축점감소，Fe화Al함량축점증가；수착도욕중Al함량증가，열침도Zn-Al합금도층적부식속솔감소；첨가희토원소능제고Zn-Al합금도층적내부식성능。
The hot-dip galvanizing alloys of Zn-(0.02-5)%Al and Zn-5%Al-0.05%RE (mass fraction) were obtained on the surface of Q235 steel by solvent drying method. The macroscopic morphology, the surface and section microstructures of the alloy coatings were observed by optical microscopy and SEM. The element distribution in the alloy coatings was analyzed by energy disperse spectroscopy, and the corrosion resistance of the alloy coatings was investigated by the neutral salt spray test and full immersion corrosion, respectively. The results show that the coating lightness is excellent when the Al content is 0.02%(mass fraction), and the coating lightness declines with increasing the Al content. The Zn content reduces and the Fe and Al contents increase gradually in the outerηphase andΓphase close to the steel substrate. The corrosion rate of the hot-dip galvanizing Zn-Al alloy coating decreases with increasing the Al content in Zn-Al alloy bath. The corrosion resistance can be enhanced with the addition of rare earth elements in the Zn-Al alloy bath.