刘艺,李国喜,郑毅然.稀土Y对热浸镀铝镀层组织及耐蚀性的影响[J].表面技术,2021,50(9):286-292.
LIU Yi,LI Guo-xi,ZHENG Yi-ran.Influence of Rare Earth Yttrium on the Structure and Corrosion Resistance of Hot-dip Aluminum Coating[J].Surface Technology,2021,50(9):286-292 |
| 稀土Y对热浸镀铝镀层组织及耐蚀性的影响 |
| Influence of Rare Earth Yttrium on the Structure and Corrosion Resistance of Hot-dip Aluminum Coating |
| 投稿时间：2020-10-27 修订日期：2021-01-04 |
| DOI：10.16490/j.cnki.issn.1001-3660.2021.09.030 |
| 中文关键词: 热浸镀铝 微观组织 耐蚀性 稀土Y 电化学方法 全浸试验 |
| 英文关键词:hot-dip aluminum coating microstructure corrosion resistance rare earth yttrium electrochemical test full immersion test |
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| 中文摘要: |
| 目的 研究稀土Y对热浸镀铝层的影响，提高热浸镀铝件的耐蚀性能。方法 通过向热浸镀铝液中添加不同量的铝钇合金，获得稀土Y含量不同的热浸镀铝件。选用3.5%的NaCl溶液为腐蚀溶液，利用SEM、EDS观测其形貌、成分，并使用电化学测试和全浸试验研究稀土Y对镀层耐蚀性能的影响。结果 当添加0.2%Y时，热浸镀铝层表面平整、无孔洞，针状相细小，镀铝层减薄，过渡层由锯齿状转变为连续带状。稀土Y的添加使镀铝件的自腐蚀电位正移，自腐蚀电流密度减小，添加量为0.2%时，自腐蚀电位最正，为‒0.7857 V，自腐蚀电流密度最小，为1.3505×10‒8 A/cm2。与添加其他稀土元素相比，添加0.2%Y时，镀层的破裂电位Eb最正，为‒0.6957 V。不同稀土含量的热浸镀铝件的交流阻抗谱都为单一的容抗弧，当稀土Y添加量为0.2%时，容抗弧半径最大。全浸试验中，添加0.2%Y的镀件的腐蚀速率最低。结论 稀土Y的添加可以使热浸铝层光滑、连续，且具有提高其耐腐蚀性的作用。Y添加量为0.2%时，镀铝件的耐蚀性最好。 |
| 英文摘要: |
| The work aims to study the influence of rare earth Y on the hot-dip aluminum coating and improve its corrosion resistance. By adding different contents of aluminum-yttrium alloy to the hot-dip aluminum coating solution, hot-dip aluminum-coated parts containing different rare earth yttrium content were obtained. In the experiment, the corrosion solution was 3.5% NaCl solution. SEM and EDS were used to observe morphology and composition and electrochemical tests and full immersion tests were used to study the effect of rare earth Y on corrosion resistance of coatings. When the content of Y was 0.2%, the surface of the hot-dip aluminized layer was smooth without holes, the needle-like phase was fine, the aluminized layer was thinner, and the shape of transition layer changed from the sawtooth to the continuous band. The rare earth Y made the corrosion potential shift positively and decreased the self-corrosion current, which the most positive self-corrosion potential was ‒0.7857 V and the minimum self-corrosion current was 1.3505×10‒8 A/cm2. Compared with other rare earth elements, the breakthrough potential Eb of the coating, when 0.2% Y was added was, the most positive potential is ‒0.6957 V. The impedance spectroscopies of hot-dip aluminized parts with different rare earth contents were all single capacitive reactance arcs. The radius of the capacitive reactance arc was the largest when the rare earth content was 0.2% Y and the corrosion rate of coated parts was the lowest when 0.2% Y was added in the full immersion test The addition of rare earth yttrium can make the surface of the hot-dip aluminum coating smooth and continuous, and the corrosion resistance can be improved. Furthermore, the corrosion resistance of aluminum-coated parts is the best when the addition amount is 0.2% Y. |
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