PEI/Ni梯度电磁屏蔽薄膜材料耐腐蚀性研究

doi:10.11896/cldb.201906029

材料导报

2019, Vol. 33

Issue (6): 1065-1069 https://doi.org/10.11896/cldb.201906029

高分子与聚合物基复合材料

PEI/Ni梯度电磁屏蔽薄膜材料耐腐蚀性研究

温变英, 段磊

北京工商大学材料科学与工程系,北京 100048

Research of Corrosion Resistance for PEI/Ni Gradient Electromagnetic Shielding Film

WEN Bianying, DUAN Lei

Department of Material Science and Engineering, Beijing Technology and Business University, Beijing 100048

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摘要通过悬浮液流延法制备了具有梯度分布结构的PEI/Ni电磁屏蔽膜,研究了该电磁屏蔽膜在潮湿、湿热、强碱、酸雨、稀强酸、浓强酸等条件下的耐腐蚀性能,并通过扫描电镜、矢量网络分析仪以及万能拉伸试验机等对复合材料经腐蚀液浸泡前后的微观形貌和电磁屏蔽效能以及力学性能进行了对比。结果表明,梯度分布结构使得该薄膜上下表面呈现的腐蚀程度有所不同,富树脂的上表面比富金属的下表面更耐腐蚀。在潮湿、湿热、强碱、酸雨模拟溶液这四种体系下,PEI/Ni梯度电磁屏蔽膜的耐腐蚀性能均比较好,经60 ℃、浸泡30 d后,其外观形貌变化不大,材料的电磁屏蔽效能基本没有下降,保持在40 dB左右,拉伸强度保持在60 MPa以上,仍显示出较高的实用价值。但这种以金属粉末作为填料的材料不耐强酸的腐蚀,在60 ℃下浸泡10 d后,样品表面因金属Ni与强酸发生化学反应而出现孔洞,导致电磁波泄露,在浓度高于0.1 mol/L的 H₂SO₄溶液中浸泡5 d,电磁屏蔽膜将丧失屏蔽性能。

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关键词: 电磁屏蔽薄膜抗腐蚀性聚醚酰亚胺镍

Abstract: Polyetherimide (PEI)/ Nickel (Ni) gradient electromagnetic shielding films were prepared by the use of suspension casting method with the principle of gravity settling. The corrosion resistance of PEI/Ni gradient electromagnetic shielding films under the environment of wet, hot and humid, strong alkali, acid rain, dilute strong acid and concentrated strong acid were studied. The scanning electron microscopy, vector network analyzer and universal tensile testing machine were used to characterize the micro-morphology, electromagnetic shielding effectiveness and the mechanical property. Changes of the gradient composite films before and after immersing in etching solution were compared. Results showed that the gradient distribution structure brought a difference in the degree of corrosion on the top and bottom surfaces of the film, and the resin-rich top surface was more resistant to corrosion than that of the metal-rich bottom surface. The corrosion resistance of PEI/Ni gradient electromagnetic shielding film was good in the humid, hot and humid, strong alkali and acid rain simulated solutions. After being immersed in those etching solution at the temperature of 60 ℃ for 30 d, the appearance of PEI/Ni gradient electromagnetic shielding films had little change. The electromagnetic shielding effectiveness did not decline, which was maintain about 40 dB, and tensile strength maintained at 60 MPa above. Experimental results showed that the PEI/Ni gradient film has better corrosion resistance and show higher application value. However, such kind of composite with metal powder as a filler was not resistant to strong acid corrosion. Small holes appeared on the surface of the sample after being immersed in strong acid etching solution at 60 ℃ for 10 d, because a chemical reaction between the metal Ni and the strong acid occured, and which resulting in electromagnetic wave leakage. As a result, it loss its electromagnetic shielding effect after being soaked within 5 d when the H₂SO₄ solution concentration was higher than 0.1 mol/L.

Key words: electromagnetic shielding film corrosion resistance polyetherimide nickel

发布日期: 2019-04-03

ZTFLH:

TB333

基金资助: 国家自然科学基金(21274007);北京工商大学高分子功能薄膜创新团队(19008001071)

作者简介: 温变英,工学博士,北京工商大学材料科学与工程系教授,北京市高等学校教学名师奖获得者。

引用本文:

温变英, 段磊. PEI/Ni梯度电磁屏蔽薄膜材料耐腐蚀性研究[J]. 材料导报, 2019, 33(6): 1065-1069.
WEN Bianying, DUAN Lei. Research of Corrosion Resistance for PEI/Ni Gradient Electromagnetic Shielding Film. Materials Reports, 2019, 33(6): 1065-1069.

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http://www.mater-rep.com/CN/10.11896/cldb.201906029 或 http://www.mater-rep.com/CN/Y2019/V33/I6/1065

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