张晓敏,张金玲,于彦冲,戴玥,孙文君,王社斌.沉积时间对镀铝层AZ31镁合金耐蚀性的影响[J].表面技术,2019,48(10):251-257.
ZHANG Xiao-min,ZHANG Jin-ling,YU Yan-chong,DAI Yue,SUN Wen-jun,WANG She-bin.Effect of Deposition Time on Corrosion Resistance of Al-coated AZ31 Magnesium Alloy[J].Surface Technology,2019,48(10):251-257 |
| 沉积时间对镀铝层AZ31镁合金耐蚀性的影响 |
| Effect of Deposition Time on Corrosion Resistance of Al-coated AZ31 Magnesium Alloy |
| 投稿时间：2019-03-10 修订日期：2019-10-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2019.10.031 |
| 中文关键词: 铝镀层 电沉积 AZ31镁合金 微观形貌 腐蚀电位 耐腐蚀性 |
| 英文关键词:aluminum coating electrode position AZ31 magnesium alloy Micromorphology corrosion potential corrosion resistance |
| 基金项目:国家自然科学基金（51371122）；山西省科学基金（201801D221138） |
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| Author | Institution |
| ZHANG Xiao-min | School of Material Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China |
| ZHANG Jin-ling | School of Material Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China |
| YU Yan-chong | School of Material Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China |
| DAI Yue | School of Material Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China |
| SUN Wen-jun | School of Material Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China |
| WANG She-bin | School of Material Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China |
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| 中文摘要: |
| 目的 提高镁合金的耐腐蚀性能。方法 利用恒电流沉积的方法在AZ31镁合金表面制得铝镀层，利用光学显微镜及扫描电子显微镜等检测手段观察镀层的微观形貌、腐蚀形貌等，并用开路电位、动电位扫描等电化学方法，检测沉积时间对镀铝后镁合金抗腐蚀性能的影响。结果 通过恒电流电沉积的方法，成功在AZ31镁合金表面制得了铝层。经过电化学腐蚀测试，未镀铝的AZ31镁合金的腐蚀电位较负，约为–1.68 V，且腐蚀电流最大。当沉积时间为1 h时，获得薄片状铝镀层，腐蚀电位正移，约为-1.34 V，镁合金的抗蚀性有了提高，但腐蚀电流只有轻微变小；当沉积时间为2 h时，薄片状铝生长为颗粒状，此时腐蚀电位约为–1.32 V，并且其腐蚀电流明显变小；随着沉积时间的延长，镀层继续生长且颗粒状铝开始向合适生长位置扩散，当沉积时间为3 h时，在镁合金表面产生片层状铝扩散区，且其腐蚀电位最正，约为–1.30 V，且此时腐蚀电流达到最小。结论 通过恒电流电沉积的方法，可以成功在AZ31镁合金表面制得铝层，且表面镀铝层可以有效提高镁合金的耐蚀性。其中沉积时间为1 h，镁合金的抗腐蚀性有轻微改善；沉积时间为2 h时，镁合金的耐蚀性进一步提高；而沉积时间为3 h时，铝镀层对镁合金的保护效果最好，腐蚀破坏最弱，镁合金的耐蚀性有明显的提高。 |
| 英文摘要: |
| The work aims to improve the corrosion resistance of magnesium alloys. Aluminum coating was prepared on AZ31 magnesium alloy surface by constant current deposition. The micro-morphology and corrosion morphology of the coating were observed by optical microscopy and scanning electron microscopy. The effect of deposition time on corrosion resistance of Al-coated magnesium alloys was investigated by open-circuit potential and potentiodynamic scanning. Aluminum coating was successfully prepared on AZ31 magnesium alloy by constant current electrodeposition. The corrosion potential of the uncoated AZ31 magnesium alloy was negative and about -1.68 V by electrochemical corrosion test, and the corrosion current was the largest. When the deposition time was 1 h, corrosion potential of magnesium alloys shifted positively and was about -1.34 V. The corrosion resistance of magnesium alloys was improved, but the corrosion current decreased slightly. When the deposition time was 2 h, the sheet aluminum grew into granular particles, the corrosion potential was about –1.32 V, and the corrosion current was obviously reduced. With the prolongation of deposition time, the coating continued to grow and the granular Al began to diffuse to the suitable growth position. When the deposition time was 3 h, a lamellar Al diffusion zone was formed on the surface of magnesium alloy, and the corrosion potential was more positive and about –1.30 V. At the same time, the corrosion current reached the minimum. Aluminum coating can be successfully prepared on AZ31 magnesium alloy by constant current electrodeposition and can effectively improve the corrosion resistance of magnesium alloy. When deposition time is 1 h, the corrosion resistance of magnesium alloy is slightly improved. When deposition time is 2 h, the corrosion resistance of magnesium alloy is further improved. When deposition time is 3 h, the aluminum coating can provide the best protection effects for magnesium alloy, the corrosion is the most weak and the corrosion resistance of magnesium alloy is improved obviously. |
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