Corrosion Performance Of Modified Epoxy Resin Coatings Containing MCM-41 Zeoliteon On Mg-Li Alloy Surface

Mg-Li alloy is the lightest metal structure material. It is widely applied to aerospace,automotive,electronic equipment, weapons and equipment. However,it has limited application in many other fields due to its poor corrosion resistance. Therefore, it is very important to enhance the corrosion resistance of Mg-Li alloy. The anti-corrosion properties of traditional epoxy coating can't meet the requirements, because it is susceptible to erosion of oxygen,water, chloride and other corrosion media. It is necessary that fillers are added to improve the corrosion resistance of epoxy coating. In this paper, the epoxy resin coating doped with different mesoporous MCM-41 was coated on the Mg-Li alloy surface, their corrosion resistance performance were investigated. The main contents of this paper are listed as follows:1. Aluminum sulfate, sodium silicate and cetyl trimethyl ammonium bromide. (CTAB)were used as an aluminum source, silicon source and template, respectively. Meanwhile, the silica/alumina ratio was 10,25 and 50, respectively. The mesoporous MCM-41 was synthesized by hydrothermal synthesis method. The XRD results show that the prepared materials are mesoporous MCM-41.2. The epoxy coating doped with 0.2%, 0.5% and 1% HMCM-41 molecular. sieve is prepared on the Mg-Li alloy surface by the coating method. The effect of concentration of HMCM-41 molecular sieve on corrosion resistance of the epoxy coating on the Mg-Li alloy surface was studied. The anti-corrosion properties of the epoxy coating doped with HMCM-41 molecular sieve were characterized by electrochemical impedance spectroscopy(EIS) and multi-day corrosion macro-morphology.3. The epoxy coating doped with 0.2%, 0.5% and 1% Ce-HMCM-41 molecular sieve is prepared on the Mg-Li alloy surface by the coating method. The anti-corrosion properties of the epoxy coating doped with HMCM-41 molecular sieve were evaluated by EIS and multi-day corrosion macro-morphology.4. The epoxy coating containing HMCM-41 molecular sieve modified with bis- (3-(triethoxysilane)-propyl) tetrasulfide (KH-69) is prepared on the Mg-Li alloy surface by the coating method. The dispersion behavior of HMCM-41 molecular sieve modified with KH-69 in xylene was investigated by the sedimentation experiments. The multi-day corrosion morphology of the sample was observed using taking continuous pictures. The effect of concentration of silane KH-69 modified zeolite HMCM-41(0.2%?0.5% and 1%) on corrosion resistance of the epoxy coating on Mg-Li alloy surface was studied. The results show that the epoxy containing 0.5% silane KH-69 modified HMCM- 41 molecular sieve exhibits high corrosion resistance.