赖勇来,李旺,金华兰,彭文屹,郭洪民,杨湘杰.AZ91D镁合金耐腐蚀性膜层的腐蚀行为[J].表面技术,2020,49(12):235-243.
LAI Yong-lai,LI Wang,JIN Hua-lan,PENG Wen-yi,GUO Hong-min,YANG Xiang-jie.Corrosion Behavior of Corrosion Resistant Film on AZ91D Magnesium Alloys[J].Surface Technology,2020,49(12):235-243 |
| AZ91D镁合金耐腐蚀性膜层的腐蚀行为 |
| Corrosion Behavior of Corrosion Resistant Film on AZ91D Magnesium Alloys |
| 投稿时间：2020-04-28 修订日期：2020-06-08 |
| DOI：10.16490/j.cnki.issn.1001-3660.2020.12.027 |
| 中文关键词: AZ91D 半固态 膜层 腐蚀形貌 分形理论 |
| 英文关键词:AZ91D semi-solid film corrosion morphology fractal theory |
| 基金项目:国家自然科学基金(51401101) |
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| Author | Institution |
| LAI Yong-lai | School of Mechanical and Electronic Engineering, Nanchang 330031, China |
| LI Wang | School of Materials Science and Engineering, Nanchang University, Nanchang 330031, China |
| JIN Hua-lan | School of Materials Science and Engineering, Nanchang University, Nanchang 330031, China |
| PENG Wen-yi | School of Materials Science and Engineering, Nanchang University, Nanchang 330031, China |
| GUO Hong-min | School of Materials Science and Engineering, Nanchang University, Nanchang 330031, China |
| YANG Xiang-jie | School of Mechanical and Electronic Engineering, Nanchang 330031, China |
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| 中文摘要: |
| 目的 为了获得耐蚀性能更加优异的AZ91D镁合金。方法 研究了铸态、半固态、成膜铸态及成膜半固态AZ91D，在模拟生理盐水(0.9%NaCl)和模拟海水(3.5%NaCl)中的腐蚀特征，并引入分形理论表征其腐蚀程度及均匀性。通过对不同状态AZ91D进行NaCl溶液腐蚀、电化学腐蚀，运用扫描形貌(SEM)和能谱(EDS)分析各状态AZ91D的腐蚀形貌，引入分形理论对各状态AZ91D的腐蚀形貌进行计算及分析。结果 在同一腐蚀时间，各状态AZ91D在模拟海水中出现更多的腐蚀区域，成膜铸态及半固态的腐蚀最早出现于膜层组织的裂纹处。在电化学实验中，随着电解液NaCl质量分数升高至3.5%，未成膜铸态及半固态的腐蚀电位分别从–1.4111 V和–1.4323 V下降为–1.5066 V和–1.5089 V，电流密度分别从6.270×10–10 A/m2和9.847×10–10 A/m2上升为4.863×10–9 A/m2和 8.396×10–9 A/m2;成膜铸态及半固态的腐蚀电位分别从–1.3884 V和–1.3430 V下降为–1.4856 V和–1.4331 V，电流密度分别从5.854×10–10 A/m2和8.592×10–10 A/m2下降为2.050×10–11 A/m2和1.189×10–11 A/m2。结论 在分形计算中，随着腐蚀液浓度或腐蚀时间的上升，铸态及半固态AZ91D的腐蚀倾向和腐蚀速率提高;膜层的腐蚀倾向提高，腐蚀速率降低。同时，各状态AZ91D的分形维数DH随腐蚀程度的增加而增大，Δa值随腐蚀均匀性的降低而增大。 |
| 英文摘要: |
| The work aims to obtain AZ91D magnesium alloys with better corrosion resistance. The corrosion characteristics of as-cast, semi-solid, film-forming as-cast and film-forming semi-solid AZ91D in simulated normal saline (0.9%NaCl) and simulated seawater (3.5%NaCl) were studied, and the fractal theory was introduced to characterize the corrosion degree and uniformity. Through NaCl solution corrosion and electrochemical corrosion of AZ91D in different states, the corrosion morphologies were analyzed by SEM and energy spectrum (EDS). Meanwhile, fractal theory was introduced to calculate and analyze the corrosion morphologies of AZ91D in various states. At the same corrosion time, more corrosion zones appeared on AZ91D in each state in the simulated seawater. The corrosion of film forming state and semi-solid state firstly appeared at the crack of film structure. In electrochemical experiments, as the concentration of electrolyte increased to 3.5%, the corrosion potential of unformed film casting and semi-solid state decreased from –1.4111 V and –1.4323 V to –1.5066 V and –1.5089 V, and the current density increased from 6.270×10–10 A/m2 and 9.847×10–10 A/m2 to 4.863×10–9 A/m2 and 8.396×10–9 A/m2. The corrosion potential in the as-cast and semi-solid state decreased from –1.3884 V and –1.3430 V to –1.4856 V and –1.4331 V, and the current density decreased from 5.854×10–10 A/m2 and 8.592×10–10 A/m2 to 2.050×10–11 A/m2 and 1.189×10–11 A/m2. In the fractal calculation, with the increase of the concentration of corrosion solution or the corrosion time, the corrosion tendency and corrosion rate of as-cast and semi-solid AZ91D increase, and the corrosion tendency of the film increases, but the corrosion rate decreases. At the same time, the DH fractal dimension of different AZ91D increases with the increase of the corrosion degree, and Δvalue increases as the corrosion uniformity decreases. |
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