(陜西理工學(xué)院 材料科學(xué)與工程學(xué)院，漢中723003)
摘 要: 采用烘干溶劑法在Q235鋼表面獲得Zn-(0.02~5)%Al和Zn-5%Al-0.05%RE(質(zhì)量分?jǐn)?shù))合金鍍層，用光學(xué)顯微鏡和掃描電鏡觀察合金鍍層的宏觀形貌和表面、斷面組織形貌，用能譜儀分析合金鍍層的合金元素分布，分別用中性鹽霧實(shí)驗(yàn)和全浸腐蝕實(shí)驗(yàn)研究合金鍍層的耐腐蝕性能。結(jié)果表明，鋅浴中Al的質(zhì)量分?jǐn)?shù)為0.02%時，Zn-Al合金鍍層的光亮度最好，隨著Al含量增加光亮度下降；Zn-Al基合金鍍層中，從外層的h相到接近鋼基體的G相中，Zn含量逐漸減少，F(xiàn)e和Al含量逐漸增加；隨著鍍浴中Al含量增加，熱浸鍍Zn-Al合金鍍層的腐蝕速率減小；添加稀土元素能提高Zn-Al合金鍍層的耐腐蝕性能。
關(guān)鍵字: Zn-Al合金；Zn-Al-RE合金；熱鍍鋅；鍍層組織；耐腐蝕性能
（School of Materials Science and Engineering, Shaanxi University of Technology, Hanzhong 723003, China）
Abstract: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 outer h phase and G phase 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.
Key words: Zn-Al alloy; Zn-Al-RE alloy; hot-dip galvanizing; coating microstructure; corrosion resistance
