| 摘要: |
| 为探讨铝、镁合金元素含量对于锌合金镀层组织及其在NaCl体系中腐蚀行为的影响，采用SEM、XRD等试验方法，研究了铝、镁成分对锌合金镀层显微组织和物相组成的影响，采用极化曲线、交流阻抗测试技术，研究了Z6A3M、Z1.6A1.6M锌铝镁镀层在NaCl体系中的腐蚀行为。结果表明，锌铝镁镀层的腐蚀电位与纯锌镀层（GI）相当；Z6A3M、Z1.6A1.6M、GI的极化阻力分别为1 305、1 163、520.7 Ω·cm2，锌铝镁镀层极化阻力较GI高出约1倍；Z6A3M、Z1.6A1.6M、GI的Warburg参数分别为0.001879、0.001496、0.01416 S/s0.5，锌铝镁镀层Warburg阻抗较GI高出约1个数量级；盐雾试验条件下，GI相对耐蚀性为1时，Z6A3M、Z1.6A1.6M相对耐蚀性分别为5.6、5.9，锌铝镁镀层相对耐蚀性约为GI的6倍；铝、镁提高锌合金镀层耐蚀性的原因在于降低了锌的溶解速度和降低了扩散速度。 |
| 关键词: 热浸镀 锌铝镁镀层 耐腐蚀性 交流阻抗 |
| DOI： |
| 分类号: |
| 基金项目:质检公益性行业科研专项（200810595） |
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| The Corrosion Behavior for Zn–Al–Mg Coating in NaCl System |
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LI Feng, LV Jia–shun, YANG Hong–gang, XU Xiao–lian, ZHONG Bin, AI Fang–fang
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Technology Centre, Angang Steel Company Limited, Anshan Liaoning 114009
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| Abstract: |
| The effect of Al and Mg on the microstructure for Zn alloy coating and on the corrosion behavior in NaCl system was studied. The effect of Al and Mg on the microstructure and phases for Zn alloy coating was studied by SEM and XRD. The corrosion behavior for Z6A3M and Z1.6A1.6M coating in NaCl system was investigated by Potentiodynamic Polarization and AC impedance technique. The results show that the corrosion potential of ZAM coating is almost same as pure Zn coating (GI). The polarization resistance of Z6A3M, Z1.6A1.6M and GI is 1 305, 1 163 and 520.7 Ω·cm2, respectively. The polarization resistance of ZAM coating is nearly 1 times higher than pure Zn coating. The Warburg resistance index of Z6A3M, Z1.6A1.6M and GI is 0.001879, 0.001496 and 0.01416 S/s0.5, respectively. The Warburg resistance of ZAM coating is about 10 times as GI. In SST, while the relative anti–corrosion ability of GI is 1, the relative anti–corrosion ability of Z6A3M and Z1.6A1.6M is 5.6 and 5.9. The relative anti–corrosion ability of ZAM coating is about 6 times as GI. The reason of the improvement of anti–corrosion ability for Zn alloyed coating by addition of Al and Mg is that the Zn dissolved rate and diffusing rate can be lowered by Al and Mg. |
| Key words: hot dip galvanizing Zn–Al–Mg coating corrosion resistance AC impedance |
