硅和镁含量对双镀Zn–23Al合金组织结构和耐蚀性的影响 第一部分--Zn–23Al–xSi镀层的组织结构和耐蚀性  

Effects of Si and Mg contents on microstructure and corrosion resistance of Zn-23Al alloy coating prepared by two-step hot dipping process:PartⅠ-Microstructure and corrosion resistance of Zn–23Al–xSi coating

作　　者：汪前雨 陆江银[2] 魏连启[1] 崔彦斌[1] WANG Qianyu;LU Jiangyin;WEI Lianqi;CUI Yanbin(State Key Laboratory of Multiphase Complex Systems,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China;Key Laboratory of Oil&Gas Fine Chemicals,Ministry of Education,College of Chemical Engineering,Xinjiang University,Urumqi 830046,China)

机构地区：[1]中国科学院过程工程研究所多相复杂系统国家重点实验室,北京100190 [2]新疆大学化工学院石油天然气精细化工教育部重点实验室,新疆乌鲁木齐830046

出　　处：《电镀与涂饰》2021年第11期813-819,共7页Electroplating & Finishing

基　　金：中国科学院过程工程研究所介尺度科学中心创新基金(COM2016A003);多相复杂系统国家重点实验室自主部署课题(MPCS-2019-A-03)。

摘　　要：采用“双镀法”在钢板表面热浸镀不同硅含量的Zn–23Al–xSi合金镀层(x=0.1,0.3,0.5,0.7,1.1)。采用扫描电镜、能谱仪、电化学测试和中性盐雾试验研究了浸镀液中硅含量对镀层组织结构和耐蚀性的影响。结果表明,随着浸镀液中硅含量升高,Zn–23Al–xSi合金层厚度先减小后稳定在2μm左右,耐蚀性先改善后变差。当浸镀液中硅含量不低于0.7%时,镀层表面出现单质硅富集相。浸镀液中硅含量为0.5%时所得Zn–23Al–0.5Si合金镀层的耐蚀性最佳。Zn–23Al–xSi alloy coatings with different silicon contents(x=0.1,0.3,0.5,0.7,1.1)were obtained on steel surface by a two-step hot dipping process.The effect of silicon content in bath on microstructure and corrosion resistance of the alloy coating was studied using scanning electron microscopy,energy-dispersive spectroscopy,electrochemical measurement,and neutral salt spray testing.The results showed that the thickness of Zn–23Al–xSi alloy coating was decreased initially and then kept at about 2μm with the increasing of silicon content in bath,while its corrosion resistance got better initially and then worse.Some silicon-rich phases were formed in the alloy coating when the silicon content in bath was 0.7wt.%above.The Zn–23Al–0.5Si alloy coating obtained from the bath with 0.5wt.%of silicon had the best corrosion resistance.

关 键 词：锌−铝−硅合金 双镀法 硅含量 微观结构 耐蚀性 

分 类 号：TQ153.2[化学工程—电化学工业]