引用本文:朱子新， 徐滨士， 陈永雄.Al含量对Zn–Al合金涂层电化学腐蚀行为的影响[J].中国表面工程,2011,24(6):58~61
ZHU Zi–xin, XU Bin–shi, CHEN Yong–xiong.Effect of Al Content on Electrochemical Corrosion Behavior of Arc Sprayed Zn–Al Coatings[J].China Surface Engineering,2011,24(6):58~61
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Al含量对Zn–Al合金涂层电化学腐蚀行为的影响
朱子新， 徐滨士， 陈永雄1,2
1.空军航空仪器设备计量总站， 北京 100070;2. 装甲兵工程学院 再制造技术重点实验室， 北京 100072
摘要:
采用粉芯丝材和高速电弧喷涂技术制备出15.9%Al、21.1%Al和30.1%Al(质量分数)三种不同Al含量的ZnAl涂层，使用扫描电镜、能谱仪、X射线衍射仪等先进手段观察了涂层的组织特征，并研究了Al含量对Zn–Al涂层在5%NaCl溶液中的电化学腐蚀行为的影响。结果表明，三种ZnAl涂层的组织结构无明显差异，都呈现出典型的层状特征，组织致密，孔隙率均低于3%；三种涂层与基体的平均拉伸结合强度都大于11 MPa，而且随着Al含量的增加涂层结合强度略有增加；随着腐蚀时间的延长，Zn–15.9Al和Zn–21.1Al涂层的自腐蚀电位和腐蚀电流存在波动，而Zn–30.1Al的自腐蚀电位始终正移、腐蚀电流不断降低，耐腐蚀性能更为优异。
关键词:  高速电弧喷涂  粉芯丝材  ZnAl涂层  电化学腐蚀  耐蚀性
DOI：
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基金项目:总装维改项目（代号略）
Effect of Al Content on Electrochemical Corrosion Behavior of Arc Sprayed Zn–Al Coatings
ZHU Zi–xin, XU Bin–shi, CHEN Yong–xiong1,2
1. Aviation Equipment Measuring Center, Beijing 100070;2. Science and Technology on Remanufacturing Laboratory, Academy of Amored Forces Engineeing, Beijing 100072
Abstract:
Cored wire and high velocity arc spraying (HVAS) techniques were used to produce ZnAl composite coatings with different Al contents (15.9%Al, 21.1%Al and 30.1%Al ). Characterizations of structure and composition of the coatings were examined with some advantage equipments such as scanning electron microscope(SEM) coupled with energy dispersion spectroscope(EDS), and X–ray diffractometer. The electrochemical corrosion behaviors of the ZnAl coatings dipped in 5% NaCl solution were also investigated. The results show that there is no obvious difference of the microstructure between the three kinds of Zn–Al coatings. A typical laminar and dense structure was performed for all the coatings, the porosity of which is lower than 3%. The coating/substrate bonding strength is higher than 11 MPa. Moreover, the bonding strength increases slightly with the increase of Al content. As the corrosion time increased, the corrosion electric potential and corrosion current of the Zn–15.9Al and Zn–21.1Al coatings fluctuates to some degree, while for the Zn–30.1Al coating, the corrosion electric potential is keeping increase and the corrosion current is keeping decrease, which manifests a higher electrochemical corrosion resistance is obtained for this coating.
Key words:  high velocity arc spraying  cored wire  ZnAl coating  electrochemical corrosion  corrosion resistance
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