镁合金表面水滑石膜制备及性能研究进展

Research Progress on Preparation and Properties of Hydrotalcite film on Magnesium Alloy

镁合金具有一系列优异的性能而被应用于许多领域,但在实际环境中镁合金易受到腐蚀,需要对其表面进行防护。水滑石具有酸碱双性、可调控性、记忆效应、层间阴离子可交换性和热稳定性,近年来受到研究者的青睐。基于这些特性研究者开发了使用阴离子交换法和水热法制备不同特性的水滑石膜,通过两步法、电场辅助、超声辅助提升膜层制备效率,水滑石膜能够有效阻挡腐蚀介质与基体的直接接触,但可能出现膜层结合力不强、致密性不够等问题。为了进一步提升水滑石膜的耐蚀性,后来根据缓蚀剂表面修饰改性、低表面能物质修饰改性和复合膜制备等对水滑石膜进行改性工艺的研究。最后对水滑石膜的发展趋势及应用前景做出了展望。

Magnesium alloy has a series of excellent properties and has been used in many fields,however,in the actual environment,magnesium alloy is vulnerable to corrosion,and its surface needs to be protected.Hydrotalcite has been favored by researchers in recent years because of its acid-base ambidextrity,controllability,memory effect,interlayer anion exchangeability and thermal stability.Based on these features,researchers using anion exchange method and hydrothermal method is developed for different features of hydrotalcite membranes,by two-step method,electric field assisted,ultrasonic assisted membrane layer preparation efficiency of hydrotalcite film can effectively stop the corrosive medium and direct contact with the substrate,but possible coating binding force is not strong,the density is not enough.In order to further improve the corrosion resistance of hydrotalcite film,the modification technology of hydrotalcite film was studied according to surface modification of corrosion inhibitor,modification of low surface energy substance and preparation of composite film.Finally,the development trend and application prospect of hydrotalcite membrane are prospected.