王熠玮,郭锋,胡文鑫,刘亮,赵学平.稀土元素Ce、Y在Mg-Mn-RE镁合金腐蚀中的作用及其差异[J].表面技术,2023,52(9):232-240, 264.
WANG Yi-wei,GUO Feng,HU Wen-xin,LIU Liang,ZHAO Xue-ping.Effects and Difference of Ce and Y on Corrosion Behaviors of Mg-Mn-RE Magnesium Alloys[J].Surface Technology,2023,52(9):232-240, 264 |
| 稀土元素Ce、Y在Mg-Mn-RE镁合金腐蚀中的作用及其差异 |
| Effects and Difference of Ce and Y on Corrosion Behaviors of Mg-Mn-RE Magnesium Alloys |
| 投稿时间：2022-08-12 修订日期：2022-12-17 |
| DOI：10.16490/j.cnki.issn.1001-3660.2023.09.019 |
| 中文关键词: Mg-Mn-RE镁合金 稀土Ce和Y 显微组织 腐蚀性能 腐蚀类型 腐蚀与缓蚀机制 |
| 英文关键词:Mg-Mn-RE magnesium alloys Ce and Y elements microstructure corrosion performance corrosion type corrosion and corrosion inhibition mechanism |
| 基金项目:内蒙古自治区科技项目(2020GG0318) |
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| Author | Institution |
| WANG Yi-wei | School of Material Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, China |
| GUO Feng | School of Material Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, China;Inner Mongolia Key Laboratory of Thin Film and Coatings, Hohhot 010051, China |
| HU Wen-xin | Baotou Research Institute of Rare Earths, Inner Mongolia Baotou 014030, China |
| LIU Liang | School of Material Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, China;Inner Mongolia Key Laboratory of Thin Film and Coatings, Hohhot 010051, China |
| ZHAO Xue-ping | School of Material Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, China;Inner Mongolia Key Laboratory of Thin Film and Coatings, Hohhot 010051, China |
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| 中文摘要: |
| 目的 探究Ce、Y稀土元素在Mg-Mn-RE镁合金腐蚀中的作用及其差异。方法 制备不同稀土含量的Mg-Mn-Ce和Mg-Mn-Y合金，采用在NaCl溶液中浸泡的方法，考察合金的腐蚀性能及腐蚀类型。测试合金的电化学性质，分析合金的腐蚀与缓蚀机制。基于合金显微组织的变化，讨论Ce、Y元素在合金腐蚀中的作用及其差异。结果 Mg-Mn-Ce和Mg-Mn-Y合金的腐蚀率随浸泡时间的增加而减小。当Ce、Y的质量分数分别为1.0%和0.5%时，合金的腐蚀质量损失最小。Mg-Mn-Ce合金中的Ce几乎全部形成了Mg12Ce化合物，并以共晶体的形式分布于晶界，合金优先在晶界发生微电偶腐蚀，表现出典型的晶间腐蚀形貌。随着Ce含量的提高，Mg-Mn-Ce合金的微电偶腐蚀加剧。Mg-Mn-Y合金以基体的阳极溶解为主，基体从固溶应力较大的腐蚀活性点优先开始腐蚀，合金表现出带有微坑的均匀腐蚀形貌。随着Y含量的提高，Mg-Mn-Y合金的阳极溶解腐蚀加快。Ce、Y元素能提高合金的膜电阻和电荷转移电阻，但Ce和Y分别在提高膜电阻和电荷转移电阻方面具有更明显的作用，且分别通过提高腐蚀产物膜的致密性和固溶体的电位对合金的腐蚀产生减缓作用。结论 Mg-Mn-Ce和Mg-Mn-Y合金的显微组织以及Ce、Y在合金腐蚀中的作用不同，导致合金的腐蚀和缓蚀机制存在明显的差别。 |
| 英文摘要: |
| To explore the effects and differences of Ce and Y rare earth elements on corrosion performance of Mg-Mn-RE magnesium alloys, the Mg-Mn-Ce and Mg-Mn-Y alloys with Ce and Y contents of 0.5, 1.0, 1.5 and 2.0 wt.% were prepared and the corrosion performance and corrosion type of the alloys were investigated by immersion corrosion test in 3.5% NaCl solution. The mechanisms of corrosion and corrosion inhibition of the alloys were analyzed by measuring their electrochemical polarization curve, AC impedance spectrum and micro-area potential distribution. Further, the effects of Ce and Y elements on the corrosion of alloys and their differences were discussed based on the change of microstructure of the alloys. The results indicated that the corrosion rate of Mg-Mn-Ce and Mg-Mn-Y alloys decreased with the increase of immersion time. When the contents of Ce and Y were 1.0 wt.% and 0.5 wt.% respectively, the corrosion weight loss after immersion for 1 day and average daily corrosion weight loss for 7 days of the alloys were the smallest. Almost all Ce in Mg-Mn-Ce alloy formed Mg12Ce compound and distributed in grain boundary in the form of eutectics. The potential of the compound was lower than that of α-Mg phase, which could form the galvanic cell with the α-Mg phase. As a result, micro-galvanic corrosion occurred preferentially in grain boundary and Mg-Mn-Ce alloy showed a typical intergranular corrosion type. With the increase of Ce content in Mg-Mn-Ce alloy, the amount of compound increased, and the degree of intergranular corrosion was aggravated accordingly. Mg-Mn-Y alloy was mainly dominated by the anodic dissolution of matrix. However, Y in Mg-Mn-Y alloy mainly dissolved in α-Mg phase and caused stress in α-Mg solid solution and the corrosion of matrix began preferentially at the active points of corrosion with higher stress. Mg-Mn-Y alloy showed a type of uniform corrosion with micro pits. With the increase of Y content in the alloy, the density of active point caused by stress increased, and the corrosion rate of the matrix became faster. In addition, Y exceeding the dissolution limit also formed Mg24Y5 compound and caused the micro-galvanic corrosion in Mg-Mn-Y alloy. Both Ce and Y elements could improve the film resistance Rfilm and the charge transfer resistance Rt of the alloys. However, Ce played a more significant role in increasing the membrane resistance by increasing the compactness of corrosion product film while Y in increasing the charge transfer resistance by increasing the potential of matrix respectively, so as to slow down the corrosion of the alloys. The maximum film resistance Rfilm of Mg-Mn-Ce alloy and the maximum charge transfer resistance Rt of Mg-Mn-Y alloy appeared when the content of Ce was 1.0 wt.% and Y was 0.5 wt.% respectively. The content of Ce affected the degree of micro-galvanic corrosion and product film protection of Mg-Mn-Ce alloy, while the content of Y affected the matrix potential, the anodic dissolution of matrix and the degree of micro-galvanic corrosion of Mg-Mn-Y alloy, resulting in that the corrosion performance of the alloys was affected by the content of rare earths and the optimal content of rare earths. Thus, the main corrosion and corrosion inhibition mechanisms of Mg-Mn-Ce and Mg-Mn-Y alloys are obviously different due to difference of the microstructure of the two alloys and the action of Ce and Y elements in corrosion of the alloys. |
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