The Research Of Magnesium Alloys In Phosphate-Permanganate Surface Treatment And Its Fiber Metal Laminate

In the trend of lightweight in Automobile industry, based on the preparation methods of advanced concepts and technology skills in GLARE plate, aluminum plate and other composite materials, a kind of new idea been presented. Magnesium and its alloys have low density, high specific stiffness, good strength, electromagnetic shielding and other excellent performance. If we can replace aluminum alloys to magnesium alloys, the problem of bad corrosion resistance and low strength about the magnesium alloys will be solved and is expected to get more effective lightweight new laminate. In this paper we combine magnesium alloy and glass fiber to made magnesium alloy-glass fiber laminate. We focuses on a new method of surface treatment in magnesium alloy and the way to manufacture magnesium alloy-glass fiber laminate, then, have the basic mechanical properties testing for magnesium alloy-glass fiber laminate. In addition, we mainly test the corrosion resistance of magnesium alloy-glass fiber laminate. The main work and conclusions are as follows:?1?Using Wilhelmy plate method to test the dynamic contact angle of processed magnesium alloys to study the factors that influence the wettability of magnesium alloys in epoxy resin. The results show that the most significant factor to influence the dynamic contact angle measurement is the concentration of KMnO₄ solution,and when the concentration of KMnO₄ is 25g/L, NaH2PO₄ is 10g/L, NaAc is 20g/L, and the time is 5min, the temperature is 75?, we can get the lowest dynamic contact angle, that is, under such conditions will have the best surface wettability.?2?Controlling the concentration of KMnO₄ solution as the only variable, the surface morphology changes of magnesium alloy were observed by SEM. It shows that: when the concentration of KMnO₄ solution is 15g/L, magnesium alloy surface has not yet formed a film; when the concentration of KMnO₄ solution is 25g/L, the magnesium alloy surface has most compact and uniform chemical conversion coating film; when the concentration of KMnO₄ solution up to 35g/L, the film begins to decompose; when the concentration of KMnO₄ solution is 65g/L, the magnesium alloy matrix also began to dissolve. Therefore, when the concentration of potassium permanganate is 25g/L can theoretically obtain optimal surface treatment. The EDS data shows that the element of Mn and P increased while the original element Mg decreased.?3?The tensile performance parameters of magnesium alloy-glass fiber laminate are as follows: tensile strength is 288 MPa, the elongation is 3.1%.?4?the saltwater corrosion test indicates that: fiber metal laminate has the best corrosion resistance, then, followed by the magnesium alloy sheet which has surface treatment, the worst is the one that without surface treatment.