Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第26卷    第5期    总第206期    2016年6月

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文章编号:1004-0609(2016)-05-1084-08
纳米ZrO2对环保型锌铝合金涂层耐蚀性能的影响
林玉划,姚正军,梁文萍,罗西希,陶学伟

(南京航空航天大学 材料科学与技术学院,南京 211106)

摘 要: 采用锌铝合金粉制备水性锌铝涂层,通过向涂层中添加纳米ZrO2,制备出纳米复合锌铝涂层。通过电化学测试、中性盐雾试验、扫描电镜观察、能谱分析和X射线衍射分析,研究纳米ZrO2对锌铝涂层耐蚀性能的影响。结果表明:纳米ZrO2能增大锌铝粉活化溶解电阻,延缓锌铝合金粉的消耗,提高涂层阴极的保护周期。当纳米ZrO2的添加量为5%(质量分数)时,涂层的耐蚀性最佳,腐蚀电流密度降低至2.156×10-6 A/cm2。纳米ZrO2的添加填补了锌铝粉之间的孔隙,使涂层组织均匀致密,增强了涂层阻挡离子渗透能力,阻止涂层表面孔蚀的发生及内部微裂纹的产生,延长涂层的防护时间。

 

关键词: ZrO2;锌铝涂层;纳米复合涂层;耐蚀性

Effect of ZrO2 nanoparticles on corrosion resistance of environmental friendly Zn-Al alloy coating
LIN Yu-hua, YAO Zheng-jun, LIANG Wen-ping, LUO Xi-xi, TAO Xue-wei

College of Material Science and Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China

Abstract:The waterborne Zn-Al coating was prepared with Zn-Al alloy powder and Zn-Al nanocomposite coating was prepared through adding ZrO2 to the as-prepared coating. The corrosion resistance of coatings was evaluated employing electrochemical experiment, neutral salt spray test, scanning electron microscope, energy dispersive spectrometer and X-ray diffraction. The results show that the ZrO2 nanoparticles can increase the active dissolution resistance and delay the consumption rate of Zn-Al powder and improve the cathodic protection period of coating. The corrosion resistance of Zn-Al nanocomposite coating is the best when the addition of ZrO2 is 5% of the mass of Zn-Al alloy powder, and the corrosion current density decreases to 2.156×10-6 A/cm2. The ZrO2 nanoparticles filling the gap between the Zn-Al particles improve the compactness and anti-penetrant efficiency of Zn-Al coating. The additions of ZrO2 nanoparticles prevent the pitting corrosion and micro crack in the coating and prolong the protective time of coating.

 

Key words: ZrO2; Zn-Al coating; nanocomposite coating; corrosion resistance

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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