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自愈工程多层涂层用于合金 AZ31B 的腐蚀保护

Mario Aparicio¹, Jadra Mosa¹, Miguel Gómez-Herrero¹

¹Instituto de Ceramica y Vidrio, Consejo Superior de Investigaciones Científicas (CSIC), Kelsen 5 (Campus de Cantoblanco), 28049 Madrid, Spain.

ACS materials Au

|March 17, 2025

概括

一种新的双层涂层保护AZ31B合金免受腐蚀. 该系统将混合玻璃与胺合的半孔结合在一起,具有自我愈合特性,并显著延长了防腐蚀保护时间.

科学领域:

材料科学材料科学材料科学
腐蚀科学腐蚀科学
纳米技术纳米技术

背景情况:

混合玻璃涂层为AZ31B合金提供了出色的防腐保护.
涂层裂可能导致局部腐蚀扩散.
需要一种自我愈合或抑制机制来克服涂层缺陷.

研究的目的:

设计一个双层涂层系统,以提高AZ31B合金的腐蚀保护.
将混合玻璃涂层的屏障特性与胺合的半孔二氧化的自我愈合作用相结合.

主要方法:

双层涂层的制造:内部 (((III) 离子合的半孔 (0.25微米) 和外部混合玻璃 (总厚度5.1微米).
使用开放电路潜力 (OCP) 和电化学阻抗光谱 (EIS) 的电化学表征.
死后扫描电子显微镜与能量分散式X射线光谱 (SEM-EDX) 分析.

主要成果:

双层涂层提供了超过575小时的腐蚀抑制证据.
突然的潜在下降和恢复表明(III) 离子抑制机制的激活.
EIS显示了高阻抗 (106.7欧姆厘米2) 和潜在下降后的恢复,证实了自我愈合.
极化曲线显示了较低的电流密度 (∼10−11 A cm−2),比裸体基板低五个数量级.
SEM-EDX证实了裂部位的积,表明其在抑制腐蚀中的作用.

结论:

开发的双层涂层有效地保护AZ31B合金免受腐蚀.
胺合的半孔二氧化层提供了一种自我愈合的腐蚀抑制机制.
这种多层系统显著提高了合金的耐腐蚀性.

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