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

Author of the article:WANG Yongmin 1,2 , CHEN Xian 1,2 , DING Yuping 1 , XU Yanwu 1 , HUANG Yu 1 , BA Zhixin 1,2

Author's Workplace：1. School of Materials Science and Engineering, Nanjing Institute of Technology, Nanjing 211167, China; 2. Jiangsu Province Advanced Structural Materials and Application Technology Laboratory, Nanjing 211167, China

Key Words：magnesium alloy; LDH; preparation method; corrosion resistance

Abstract： 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.