史强,沈承金,胡光伟,刘瑞.聚乙二醇分散的锌铝铬涂层在3.5%NaCl溶液中的腐蚀行为及防腐蚀机理[J].表面技术,2010,39(6):8-12.
SHI Qiang,SHEN Cheng-jin,HU Guang-wei,LIU Rui.Corrosion Behavior and Anticorrosion Mechanism of the Zn-Al-Cr Coating Dispersed by Polyethylene Glycol in 3.5% NaCl Solution[J].Surface Technology,2010,39(6):8-12
聚乙二醇分散的锌铝铬涂层在3.5%NaCl溶液中的腐蚀行为及防腐蚀机理
Corrosion Behavior and Anticorrosion Mechanism of the Zn-Al-Cr Coating Dispersed by Polyethylene Glycol in 3.5% NaCl Solution
投稿时间:2010-09-08  修订日期:2010-12-10
DOI:
中文关键词:  锌铝铬涂层  极化曲线  交流阻抗  腐蚀机理
英文关键词:Zn-Al-Cr coating  polarization curves  electrochemical impendence spectrum  corrosion mechanism
基金项目:江苏省自然科学基金(BK2008509)
作者单位
史强 中国矿业大学材料科学与工程学院,徐州221116 
沈承金 中国矿业大学材料科学与工程学院,徐州221116 
胡光伟 江苏省交通规划设计院有限公司,南京210005 
刘瑞 中国矿业大学材料科学与工程学院,徐州221116 
AuthorInstitution
SHI Qiang College of Materials Science& Engineering, China University of Mining and Technology, Xuzhou 221116, China 
SHEN Cheng-jin College of Materials Science& Engineering, China University of Mining and Technology, Xuzhou 221116, China 
HU Guang-wei Jiangsu Provincial Communication Planning and Design Co, Ltd, Nanjing 210005, China 
LIU Rui College of Materials Science& Engineering, China University of Mining and Technology, Xuzhou 221116, China 
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中文摘要:
      采用强极化、弱极化、交流阻抗以及XRD和SEM等手段,分析了聚乙二醇分散的锌铝铬涂层在3.5%NaCl介质中腐蚀电位、腐蚀电流密度、阻抗的变化和阳极钝化情况,以及腐蚀前后的物相组成和表面形貌,研究了涂层的防腐蚀机理。结果表明:涂层在腐蚀初期存在强烈的阳极钝化,随着腐蚀的进行,钝化现象逐渐减弱;在较长时间的浸泡下,涂层对钢基体的保护效果明显。防腐蚀机理为:腐蚀前期是涂层中的锌、铝粉活性溶解产生钝化,中期是钝化膜溶解、Cr6+的再钝化及锌、铝粉提供电化学保护,后期主要是涂层屏蔽作用,而屏蔽作用是涂层的主要保护作用。
英文摘要:
      The Zn-Al-Cr coating,which was dispersed by polyethylene glycol,was investigated. The phase structure, surface morphology and corrosion products were observed and analyzed by XRD and SEM. The anode passivation and corrosion characteristics of the Zn-Al-Cr coating were analyzed and discussed by means of the methods of the polarization, weak polarization and electrochemical impendence spectrum in 3.5%NaCl solution condition, studying the corrosion mechanism of the coating. The results show that there is a sharp anodic passivate phenomenon for the Zn-Al-Cr coating at the initial stage, the passivate phenomenon gradually weakens with the increasing of corrosion time. The protective effect of the coating on the steel substrate is obvious at a long immersion time.The corrosion mechanism of the Zn-Al-Cr coating mainly includes three stages. At the initial stage, the Zn/Al powders are getting passivating during the active dissolution. The middle stage includes the passive film dissolution, the repassivation of the Cr6+ and the Zn/Al powers provide electrochemical protection for the substrate. For the late stage, the isolation protection of the coating is predominant. The third stage lasts a longer period,indicating a strong isolation mechanism of corrosion prevention of the Zn-Al-Cr coating.
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